| /* |
| * Kernel-based Virtual Machine driver for Linux |
| * |
| * This module enables machines with Intel VT-x extensions to run virtual |
| * machines without emulation or binary translation. |
| * |
| * Copyright (C) 2006 Qumranet, Inc. |
| * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
| * |
| * Authors: |
| * Avi Kivity <avi@qumranet.com> |
| * Yaniv Kamay <yaniv@qumranet.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2. See |
| * the COPYING file in the top-level directory. |
| * |
| */ |
| |
| #include "irq.h" |
| #include "mmu.h" |
| #include "cpuid.h" |
| #include "lapic.h" |
| |
| #include <linux/kvm_host.h> |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/highmem.h> |
| #include <linux/sched.h> |
| #include <linux/moduleparam.h> |
| #include <linux/mod_devicetable.h> |
| #include <linux/trace_events.h> |
| #include <linux/slab.h> |
| #include <linux/tboot.h> |
| #include <linux/hrtimer.h> |
| #include <linux/frame.h> |
| #include <linux/nospec.h> |
| #include "kvm_cache_regs.h" |
| #include "x86.h" |
| |
| #include <asm/asm.h> |
| #include <asm/cpu.h> |
| #include <asm/io.h> |
| #include <asm/desc.h> |
| #include <asm/vmx.h> |
| #include <asm/virtext.h> |
| #include <asm/mce.h> |
| #include <asm/fpu/internal.h> |
| #include <asm/perf_event.h> |
| #include <asm/debugreg.h> |
| #include <asm/kexec.h> |
| #include <asm/apic.h> |
| #include <asm/irq_remapping.h> |
| #include <asm/mmu_context.h> |
| #include <asm/spec-ctrl.h> |
| #include <asm/mshyperv.h> |
| |
| #include "trace.h" |
| #include "pmu.h" |
| #include "vmx_evmcs.h" |
| |
| #define __ex(x) __kvm_handle_fault_on_reboot(x) |
| #define __ex_clear(x, reg) \ |
| ____kvm_handle_fault_on_reboot(x, "xor " reg " , " reg) |
| |
| MODULE_AUTHOR("Qumranet"); |
| MODULE_LICENSE("GPL"); |
| |
| static const struct x86_cpu_id vmx_cpu_id[] = { |
| X86_FEATURE_MATCH(X86_FEATURE_VMX), |
| {} |
| }; |
| MODULE_DEVICE_TABLE(x86cpu, vmx_cpu_id); |
| |
| static bool __read_mostly enable_vpid = 1; |
| module_param_named(vpid, enable_vpid, bool, 0444); |
| |
| static bool __read_mostly enable_vnmi = 1; |
| module_param_named(vnmi, enable_vnmi, bool, S_IRUGO); |
| |
| static bool __read_mostly flexpriority_enabled = 1; |
| module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO); |
| |
| static bool __read_mostly enable_ept = 1; |
| module_param_named(ept, enable_ept, bool, S_IRUGO); |
| |
| static bool __read_mostly enable_unrestricted_guest = 1; |
| module_param_named(unrestricted_guest, |
| enable_unrestricted_guest, bool, S_IRUGO); |
| |
| static bool __read_mostly enable_ept_ad_bits = 1; |
| module_param_named(eptad, enable_ept_ad_bits, bool, S_IRUGO); |
| |
| static bool __read_mostly emulate_invalid_guest_state = true; |
| module_param(emulate_invalid_guest_state, bool, S_IRUGO); |
| |
| static bool __read_mostly fasteoi = 1; |
| module_param(fasteoi, bool, S_IRUGO); |
| |
| static bool __read_mostly enable_apicv = 1; |
| module_param(enable_apicv, bool, S_IRUGO); |
| |
| static bool __read_mostly enable_shadow_vmcs = 1; |
| module_param_named(enable_shadow_vmcs, enable_shadow_vmcs, bool, S_IRUGO); |
| /* |
| * If nested=1, nested virtualization is supported, i.e., guests may use |
| * VMX and be a hypervisor for its own guests. If nested=0, guests may not |
| * use VMX instructions. |
| */ |
| static bool __read_mostly nested = 0; |
| module_param(nested, bool, S_IRUGO); |
| |
| static bool __read_mostly nested_early_check = 0; |
| module_param(nested_early_check, bool, S_IRUGO); |
| |
| static u64 __read_mostly host_xss; |
| |
| static bool __read_mostly enable_pml = 1; |
| module_param_named(pml, enable_pml, bool, S_IRUGO); |
| |
| #define MSR_TYPE_R 1 |
| #define MSR_TYPE_W 2 |
| #define MSR_TYPE_RW 3 |
| |
| #define MSR_BITMAP_MODE_X2APIC 1 |
| #define MSR_BITMAP_MODE_X2APIC_APICV 2 |
| |
| #define KVM_VMX_TSC_MULTIPLIER_MAX 0xffffffffffffffffULL |
| |
| /* Guest_tsc -> host_tsc conversion requires 64-bit division. */ |
| static int __read_mostly cpu_preemption_timer_multi; |
| static bool __read_mostly enable_preemption_timer = 1; |
| #ifdef CONFIG_X86_64 |
| module_param_named(preemption_timer, enable_preemption_timer, bool, S_IRUGO); |
| #endif |
| |
| #define KVM_VM_CR0_ALWAYS_OFF (X86_CR0_NW | X86_CR0_CD) |
| #define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST X86_CR0_NE |
| #define KVM_VM_CR0_ALWAYS_ON \ |
| (KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | \ |
| X86_CR0_WP | X86_CR0_PG | X86_CR0_PE) |
| #define KVM_CR4_GUEST_OWNED_BITS \ |
| (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR \ |
| | X86_CR4_OSXMMEXCPT | X86_CR4_LA57 | X86_CR4_TSD) |
| |
| #define KVM_VM_CR4_ALWAYS_ON_UNRESTRICTED_GUEST X86_CR4_VMXE |
| #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE) |
| #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE) |
| |
| #define RMODE_GUEST_OWNED_EFLAGS_BITS (~(X86_EFLAGS_IOPL | X86_EFLAGS_VM)) |
| |
| #define VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE 5 |
| |
| /* |
| * Hyper-V requires all of these, so mark them as supported even though |
| * they are just treated the same as all-context. |
| */ |
| #define VMX_VPID_EXTENT_SUPPORTED_MASK \ |
| (VMX_VPID_EXTENT_INDIVIDUAL_ADDR_BIT | \ |
| VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT | \ |
| VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT | \ |
| VMX_VPID_EXTENT_SINGLE_NON_GLOBAL_BIT) |
| |
| /* |
| * These 2 parameters are used to config the controls for Pause-Loop Exiting: |
| * ple_gap: upper bound on the amount of time between two successive |
| * executions of PAUSE in a loop. Also indicate if ple enabled. |
| * According to test, this time is usually smaller than 128 cycles. |
| * ple_window: upper bound on the amount of time a guest is allowed to execute |
| * in a PAUSE loop. Tests indicate that most spinlocks are held for |
| * less than 2^12 cycles |
| * Time is measured based on a counter that runs at the same rate as the TSC, |
| * refer SDM volume 3b section 21.6.13 & 22.1.3. |
| */ |
| static unsigned int ple_gap = KVM_DEFAULT_PLE_GAP; |
| |
| static unsigned int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW; |
| module_param(ple_window, uint, 0444); |
| |
| /* Default doubles per-vcpu window every exit. */ |
| static unsigned int ple_window_grow = KVM_DEFAULT_PLE_WINDOW_GROW; |
| module_param(ple_window_grow, uint, 0444); |
| |
| /* Default resets per-vcpu window every exit to ple_window. */ |
| static unsigned int ple_window_shrink = KVM_DEFAULT_PLE_WINDOW_SHRINK; |
| module_param(ple_window_shrink, uint, 0444); |
| |
| /* Default is to compute the maximum so we can never overflow. */ |
| static unsigned int ple_window_max = KVM_VMX_DEFAULT_PLE_WINDOW_MAX; |
| module_param(ple_window_max, uint, 0444); |
| |
| extern const ulong vmx_return; |
| extern const ulong vmx_early_consistency_check_return; |
| |
| static DEFINE_STATIC_KEY_FALSE(vmx_l1d_should_flush); |
| static DEFINE_STATIC_KEY_FALSE(vmx_l1d_flush_cond); |
| static DEFINE_MUTEX(vmx_l1d_flush_mutex); |
| |
| /* Storage for pre module init parameter parsing */ |
| static enum vmx_l1d_flush_state __read_mostly vmentry_l1d_flush_param = VMENTER_L1D_FLUSH_AUTO; |
| |
| static const struct { |
| const char *option; |
| bool for_parse; |
| } vmentry_l1d_param[] = { |
| [VMENTER_L1D_FLUSH_AUTO] = {"auto", true}, |
| [VMENTER_L1D_FLUSH_NEVER] = {"never", true}, |
| [VMENTER_L1D_FLUSH_COND] = {"cond", true}, |
| [VMENTER_L1D_FLUSH_ALWAYS] = {"always", true}, |
| [VMENTER_L1D_FLUSH_EPT_DISABLED] = {"EPT disabled", false}, |
| [VMENTER_L1D_FLUSH_NOT_REQUIRED] = {"not required", false}, |
| }; |
| |
| #define L1D_CACHE_ORDER 4 |
| static void *vmx_l1d_flush_pages; |
| |
| static int vmx_setup_l1d_flush(enum vmx_l1d_flush_state l1tf) |
| { |
| struct page *page; |
| unsigned int i; |
| |
| if (!enable_ept) { |
| l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_EPT_DISABLED; |
| return 0; |
| } |
| |
| if (boot_cpu_has(X86_FEATURE_ARCH_CAPABILITIES)) { |
| u64 msr; |
| |
| rdmsrl(MSR_IA32_ARCH_CAPABILITIES, msr); |
| if (msr & ARCH_CAP_SKIP_VMENTRY_L1DFLUSH) { |
| l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_NOT_REQUIRED; |
| return 0; |
| } |
| } |
| |
| /* If set to auto use the default l1tf mitigation method */ |
| if (l1tf == VMENTER_L1D_FLUSH_AUTO) { |
| switch (l1tf_mitigation) { |
| case L1TF_MITIGATION_OFF: |
| l1tf = VMENTER_L1D_FLUSH_NEVER; |
| break; |
| case L1TF_MITIGATION_FLUSH_NOWARN: |
| case L1TF_MITIGATION_FLUSH: |
| case L1TF_MITIGATION_FLUSH_NOSMT: |
| l1tf = VMENTER_L1D_FLUSH_COND; |
| break; |
| case L1TF_MITIGATION_FULL: |
| case L1TF_MITIGATION_FULL_FORCE: |
| l1tf = VMENTER_L1D_FLUSH_ALWAYS; |
| break; |
| } |
| } else if (l1tf_mitigation == L1TF_MITIGATION_FULL_FORCE) { |
| l1tf = VMENTER_L1D_FLUSH_ALWAYS; |
| } |
| |
| if (l1tf != VMENTER_L1D_FLUSH_NEVER && !vmx_l1d_flush_pages && |
| !boot_cpu_has(X86_FEATURE_FLUSH_L1D)) { |
| page = alloc_pages(GFP_KERNEL, L1D_CACHE_ORDER); |
| if (!page) |
| return -ENOMEM; |
| vmx_l1d_flush_pages = page_address(page); |
| |
| /* |
| * Initialize each page with a different pattern in |
| * order to protect against KSM in the nested |
| * virtualization case. |
| */ |
| for (i = 0; i < 1u << L1D_CACHE_ORDER; ++i) { |
| memset(vmx_l1d_flush_pages + i * PAGE_SIZE, i + 1, |
| PAGE_SIZE); |
| } |
| } |
| |
| l1tf_vmx_mitigation = l1tf; |
| |
| if (l1tf != VMENTER_L1D_FLUSH_NEVER) |
| static_branch_enable(&vmx_l1d_should_flush); |
| else |
| static_branch_disable(&vmx_l1d_should_flush); |
| |
| if (l1tf == VMENTER_L1D_FLUSH_COND) |
| static_branch_enable(&vmx_l1d_flush_cond); |
| else |
| static_branch_disable(&vmx_l1d_flush_cond); |
| return 0; |
| } |
| |
| static int vmentry_l1d_flush_parse(const char *s) |
| { |
| unsigned int i; |
| |
| if (s) { |
| for (i = 0; i < ARRAY_SIZE(vmentry_l1d_param); i++) { |
| if (vmentry_l1d_param[i].for_parse && |
| sysfs_streq(s, vmentry_l1d_param[i].option)) |
| return i; |
| } |
| } |
| return -EINVAL; |
| } |
| |
| static int vmentry_l1d_flush_set(const char *s, const struct kernel_param *kp) |
| { |
| int l1tf, ret; |
| |
| l1tf = vmentry_l1d_flush_parse(s); |
| if (l1tf < 0) |
| return l1tf; |
| |
| if (!boot_cpu_has(X86_BUG_L1TF)) |
| return 0; |
| |
| /* |
| * Has vmx_init() run already? If not then this is the pre init |
| * parameter parsing. In that case just store the value and let |
| * vmx_init() do the proper setup after enable_ept has been |
| * established. |
| */ |
| if (l1tf_vmx_mitigation == VMENTER_L1D_FLUSH_AUTO) { |
| vmentry_l1d_flush_param = l1tf; |
| return 0; |
| } |
| |
| mutex_lock(&vmx_l1d_flush_mutex); |
| ret = vmx_setup_l1d_flush(l1tf); |
| mutex_unlock(&vmx_l1d_flush_mutex); |
| return ret; |
| } |
| |
| static int vmentry_l1d_flush_get(char *s, const struct kernel_param *kp) |
| { |
| if (WARN_ON_ONCE(l1tf_vmx_mitigation >= ARRAY_SIZE(vmentry_l1d_param))) |
| return sprintf(s, "???\n"); |
| |
| return sprintf(s, "%s\n", vmentry_l1d_param[l1tf_vmx_mitigation].option); |
| } |
| |
| static const struct kernel_param_ops vmentry_l1d_flush_ops = { |
| .set = vmentry_l1d_flush_set, |
| .get = vmentry_l1d_flush_get, |
| }; |
| module_param_cb(vmentry_l1d_flush, &vmentry_l1d_flush_ops, NULL, 0644); |
| |
| enum ept_pointers_status { |
| EPT_POINTERS_CHECK = 0, |
| EPT_POINTERS_MATCH = 1, |
| EPT_POINTERS_MISMATCH = 2 |
| }; |
| |
| struct kvm_vmx { |
| struct kvm kvm; |
| |
| unsigned int tss_addr; |
| bool ept_identity_pagetable_done; |
| gpa_t ept_identity_map_addr; |
| |
| enum ept_pointers_status ept_pointers_match; |
| spinlock_t ept_pointer_lock; |
| }; |
| |
| #define NR_AUTOLOAD_MSRS 8 |
| |
| struct vmcs_hdr { |
| u32 revision_id:31; |
| u32 shadow_vmcs:1; |
| }; |
| |
| struct vmcs { |
| struct vmcs_hdr hdr; |
| u32 abort; |
| char data[0]; |
| }; |
| |
| /* |
| * vmcs_host_state tracks registers that are loaded from the VMCS on VMEXIT |
| * and whose values change infrequently, but are not constant. I.e. this is |
| * used as a write-through cache of the corresponding VMCS fields. |
| */ |
| struct vmcs_host_state { |
| unsigned long cr3; /* May not match real cr3 */ |
| unsigned long cr4; /* May not match real cr4 */ |
| unsigned long gs_base; |
| unsigned long fs_base; |
| |
| u16 fs_sel, gs_sel, ldt_sel; |
| #ifdef CONFIG_X86_64 |
| u16 ds_sel, es_sel; |
| #endif |
| }; |
| |
| /* |
| * Track a VMCS that may be loaded on a certain CPU. If it is (cpu!=-1), also |
| * remember whether it was VMLAUNCHed, and maintain a linked list of all VMCSs |
| * loaded on this CPU (so we can clear them if the CPU goes down). |
| */ |
| struct loaded_vmcs { |
| struct vmcs *vmcs; |
| struct vmcs *shadow_vmcs; |
| int cpu; |
| bool launched; |
| bool nmi_known_unmasked; |
| bool hv_timer_armed; |
| /* Support for vnmi-less CPUs */ |
| int soft_vnmi_blocked; |
| ktime_t entry_time; |
| s64 vnmi_blocked_time; |
| unsigned long *msr_bitmap; |
| struct list_head loaded_vmcss_on_cpu_link; |
| struct vmcs_host_state host_state; |
| }; |
| |
| struct shared_msr_entry { |
| unsigned index; |
| u64 data; |
| u64 mask; |
| }; |
| |
| /* |
| * struct vmcs12 describes the state that our guest hypervisor (L1) keeps for a |
| * single nested guest (L2), hence the name vmcs12. Any VMX implementation has |
| * a VMCS structure, and vmcs12 is our emulated VMX's VMCS. This structure is |
| * stored in guest memory specified by VMPTRLD, but is opaque to the guest, |
| * which must access it using VMREAD/VMWRITE/VMCLEAR instructions. |
| * More than one of these structures may exist, if L1 runs multiple L2 guests. |
| * nested_vmx_run() will use the data here to build the vmcs02: a VMCS for the |
| * underlying hardware which will be used to run L2. |
| * This structure is packed to ensure that its layout is identical across |
| * machines (necessary for live migration). |
| * |
| * IMPORTANT: Changing the layout of existing fields in this structure |
| * will break save/restore compatibility with older kvm releases. When |
| * adding new fields, either use space in the reserved padding* arrays |
| * or add the new fields to the end of the structure. |
| */ |
| typedef u64 natural_width; |
| struct __packed vmcs12 { |
| /* According to the Intel spec, a VMCS region must start with the |
| * following two fields. Then follow implementation-specific data. |
| */ |
| struct vmcs_hdr hdr; |
| u32 abort; |
| |
| u32 launch_state; /* set to 0 by VMCLEAR, to 1 by VMLAUNCH */ |
| u32 padding[7]; /* room for future expansion */ |
| |
| u64 io_bitmap_a; |
| u64 io_bitmap_b; |
| u64 msr_bitmap; |
| u64 vm_exit_msr_store_addr; |
| u64 vm_exit_msr_load_addr; |
| u64 vm_entry_msr_load_addr; |
| u64 tsc_offset; |
| u64 virtual_apic_page_addr; |
| u64 apic_access_addr; |
| u64 posted_intr_desc_addr; |
| u64 ept_pointer; |
| u64 eoi_exit_bitmap0; |
| u64 eoi_exit_bitmap1; |
| u64 eoi_exit_bitmap2; |
| u64 eoi_exit_bitmap3; |
| u64 xss_exit_bitmap; |
| u64 guest_physical_address; |
| u64 vmcs_link_pointer; |
| u64 guest_ia32_debugctl; |
| u64 guest_ia32_pat; |
| u64 guest_ia32_efer; |
| u64 guest_ia32_perf_global_ctrl; |
| u64 guest_pdptr0; |
| u64 guest_pdptr1; |
| u64 guest_pdptr2; |
| u64 guest_pdptr3; |
| u64 guest_bndcfgs; |
| u64 host_ia32_pat; |
| u64 host_ia32_efer; |
| u64 host_ia32_perf_global_ctrl; |
| u64 vmread_bitmap; |
| u64 vmwrite_bitmap; |
| u64 vm_function_control; |
| u64 eptp_list_address; |
| u64 pml_address; |
| u64 padding64[3]; /* room for future expansion */ |
| /* |
| * To allow migration of L1 (complete with its L2 guests) between |
| * machines of different natural widths (32 or 64 bit), we cannot have |
| * unsigned long fields with no explict size. We use u64 (aliased |
| * natural_width) instead. Luckily, x86 is little-endian. |
| */ |
| natural_width cr0_guest_host_mask; |
| natural_width cr4_guest_host_mask; |
| natural_width cr0_read_shadow; |
| natural_width cr4_read_shadow; |
| natural_width cr3_target_value0; |
| natural_width cr3_target_value1; |
| natural_width cr3_target_value2; |
| natural_width cr3_target_value3; |
| natural_width exit_qualification; |
| natural_width guest_linear_address; |
| natural_width guest_cr0; |
| natural_width guest_cr3; |
| natural_width guest_cr4; |
| natural_width guest_es_base; |
| natural_width guest_cs_base; |
| natural_width guest_ss_base; |
| natural_width guest_ds_base; |
| natural_width guest_fs_base; |
| natural_width guest_gs_base; |
| natural_width guest_ldtr_base; |
| natural_width guest_tr_base; |
| natural_width guest_gdtr_base; |
| natural_width guest_idtr_base; |
| natural_width guest_dr7; |
| natural_width guest_rsp; |
| natural_width guest_rip; |
| natural_width guest_rflags; |
| natural_width guest_pending_dbg_exceptions; |
| natural_width guest_sysenter_esp; |
| natural_width guest_sysenter_eip; |
| natural_width host_cr0; |
| natural_width host_cr3; |
| natural_width host_cr4; |
| natural_width host_fs_base; |
| natural_width host_gs_base; |
| natural_width host_tr_base; |
| natural_width host_gdtr_base; |
| natural_width host_idtr_base; |
| natural_width host_ia32_sysenter_esp; |
| natural_width host_ia32_sysenter_eip; |
| natural_width host_rsp; |
| natural_width host_rip; |
| natural_width paddingl[8]; /* room for future expansion */ |
| u32 pin_based_vm_exec_control; |
| u32 cpu_based_vm_exec_control; |
| u32 exception_bitmap; |
| u32 page_fault_error_code_mask; |
| u32 page_fault_error_code_match; |
| u32 cr3_target_count; |
| u32 vm_exit_controls; |
| u32 vm_exit_msr_store_count; |
| u32 vm_exit_msr_load_count; |
| u32 vm_entry_controls; |
| u32 vm_entry_msr_load_count; |
| u32 vm_entry_intr_info_field; |
| u32 vm_entry_exception_error_code; |
| u32 vm_entry_instruction_len; |
| u32 tpr_threshold; |
| u32 secondary_vm_exec_control; |
| u32 vm_instruction_error; |
| u32 vm_exit_reason; |
| u32 vm_exit_intr_info; |
| u32 vm_exit_intr_error_code; |
| u32 idt_vectoring_info_field; |
| u32 idt_vectoring_error_code; |
| u32 vm_exit_instruction_len; |
| u32 vmx_instruction_info; |
| u32 guest_es_limit; |
| u32 guest_cs_limit; |
| u32 guest_ss_limit; |
| u32 guest_ds_limit; |
| u32 guest_fs_limit; |
| u32 guest_gs_limit; |
| u32 guest_ldtr_limit; |
| u32 guest_tr_limit; |
| u32 guest_gdtr_limit; |
| u32 guest_idtr_limit; |
| u32 guest_es_ar_bytes; |
| u32 guest_cs_ar_bytes; |
| u32 guest_ss_ar_bytes; |
| u32 guest_ds_ar_bytes; |
| u32 guest_fs_ar_bytes; |
| u32 guest_gs_ar_bytes; |
| u32 guest_ldtr_ar_bytes; |
| u32 guest_tr_ar_bytes; |
| u32 guest_interruptibility_info; |
| u32 guest_activity_state; |
| u32 guest_sysenter_cs; |
| u32 host_ia32_sysenter_cs; |
| u32 vmx_preemption_timer_value; |
| u32 padding32[7]; /* room for future expansion */ |
| u16 virtual_processor_id; |
| u16 posted_intr_nv; |
| u16 guest_es_selector; |
| u16 guest_cs_selector; |
| u16 guest_ss_selector; |
| u16 guest_ds_selector; |
| u16 guest_fs_selector; |
| u16 guest_gs_selector; |
| u16 guest_ldtr_selector; |
| u16 guest_tr_selector; |
| u16 guest_intr_status; |
| u16 host_es_selector; |
| u16 host_cs_selector; |
| u16 host_ss_selector; |
| u16 host_ds_selector; |
| u16 host_fs_selector; |
| u16 host_gs_selector; |
| u16 host_tr_selector; |
| u16 guest_pml_index; |
| }; |
| |
| /* |
| * For save/restore compatibility, the vmcs12 field offsets must not change. |
| */ |
| #define CHECK_OFFSET(field, loc) \ |
| BUILD_BUG_ON_MSG(offsetof(struct vmcs12, field) != (loc), \ |
| "Offset of " #field " in struct vmcs12 has changed.") |
| |
| static inline void vmx_check_vmcs12_offsets(void) { |
| CHECK_OFFSET(hdr, 0); |
| CHECK_OFFSET(abort, 4); |
| CHECK_OFFSET(launch_state, 8); |
| CHECK_OFFSET(io_bitmap_a, 40); |
| CHECK_OFFSET(io_bitmap_b, 48); |
| CHECK_OFFSET(msr_bitmap, 56); |
| CHECK_OFFSET(vm_exit_msr_store_addr, 64); |
| CHECK_OFFSET(vm_exit_msr_load_addr, 72); |
| CHECK_OFFSET(vm_entry_msr_load_addr, 80); |
| CHECK_OFFSET(tsc_offset, 88); |
| CHECK_OFFSET(virtual_apic_page_addr, 96); |
| CHECK_OFFSET(apic_access_addr, 104); |
| CHECK_OFFSET(posted_intr_desc_addr, 112); |
| CHECK_OFFSET(ept_pointer, 120); |
| CHECK_OFFSET(eoi_exit_bitmap0, 128); |
| CHECK_OFFSET(eoi_exit_bitmap1, 136); |
| CHECK_OFFSET(eoi_exit_bitmap2, 144); |
| CHECK_OFFSET(eoi_exit_bitmap3, 152); |
| CHECK_OFFSET(xss_exit_bitmap, 160); |
| CHECK_OFFSET(guest_physical_address, 168); |
| CHECK_OFFSET(vmcs_link_pointer, 176); |
| CHECK_OFFSET(guest_ia32_debugctl, 184); |
| CHECK_OFFSET(guest_ia32_pat, 192); |
| CHECK_OFFSET(guest_ia32_efer, 200); |
| CHECK_OFFSET(guest_ia32_perf_global_ctrl, 208); |
| CHECK_OFFSET(guest_pdptr0, 216); |
| CHECK_OFFSET(guest_pdptr1, 224); |
| CHECK_OFFSET(guest_pdptr2, 232); |
| CHECK_OFFSET(guest_pdptr3, 240); |
| CHECK_OFFSET(guest_bndcfgs, 248); |
| CHECK_OFFSET(host_ia32_pat, 256); |
| CHECK_OFFSET(host_ia32_efer, 264); |
| CHECK_OFFSET(host_ia32_perf_global_ctrl, 272); |
| CHECK_OFFSET(vmread_bitmap, 280); |
| CHECK_OFFSET(vmwrite_bitmap, 288); |
| CHECK_OFFSET(vm_function_control, 296); |
| CHECK_OFFSET(eptp_list_address, 304); |
| CHECK_OFFSET(pml_address, 312); |
| CHECK_OFFSET(cr0_guest_host_mask, 344); |
| CHECK_OFFSET(cr4_guest_host_mask, 352); |
| CHECK_OFFSET(cr0_read_shadow, 360); |
| CHECK_OFFSET(cr4_read_shadow, 368); |
| CHECK_OFFSET(cr3_target_value0, 376); |
| CHECK_OFFSET(cr3_target_value1, 384); |
| CHECK_OFFSET(cr3_target_value2, 392); |
| CHECK_OFFSET(cr3_target_value3, 400); |
| CHECK_OFFSET(exit_qualification, 408); |
| CHECK_OFFSET(guest_linear_address, 416); |
| CHECK_OFFSET(guest_cr0, 424); |
| CHECK_OFFSET(guest_cr3, 432); |
| CHECK_OFFSET(guest_cr4, 440); |
| CHECK_OFFSET(guest_es_base, 448); |
| CHECK_OFFSET(guest_cs_base, 456); |
| CHECK_OFFSET(guest_ss_base, 464); |
| CHECK_OFFSET(guest_ds_base, 472); |
| CHECK_OFFSET(guest_fs_base, 480); |
| CHECK_OFFSET(guest_gs_base, 488); |
| CHECK_OFFSET(guest_ldtr_base, 496); |
| CHECK_OFFSET(guest_tr_base, 504); |
| CHECK_OFFSET(guest_gdtr_base, 512); |
| CHECK_OFFSET(guest_idtr_base, 520); |
| CHECK_OFFSET(guest_dr7, 528); |
| CHECK_OFFSET(guest_rsp, 536); |
| CHECK_OFFSET(guest_rip, 544); |
| CHECK_OFFSET(guest_rflags, 552); |
| CHECK_OFFSET(guest_pending_dbg_exceptions, 560); |
| CHECK_OFFSET(guest_sysenter_esp, 568); |
| CHECK_OFFSET(guest_sysenter_eip, 576); |
| CHECK_OFFSET(host_cr0, 584); |
| CHECK_OFFSET(host_cr3, 592); |
| CHECK_OFFSET(host_cr4, 600); |
| CHECK_OFFSET(host_fs_base, 608); |
| CHECK_OFFSET(host_gs_base, 616); |
| CHECK_OFFSET(host_tr_base, 624); |
| CHECK_OFFSET(host_gdtr_base, 632); |
| CHECK_OFFSET(host_idtr_base, 640); |
| CHECK_OFFSET(host_ia32_sysenter_esp, 648); |
| CHECK_OFFSET(host_ia32_sysenter_eip, 656); |
| CHECK_OFFSET(host_rsp, 664); |
| CHECK_OFFSET(host_rip, 672); |
| CHECK_OFFSET(pin_based_vm_exec_control, 744); |
| CHECK_OFFSET(cpu_based_vm_exec_control, 748); |
| CHECK_OFFSET(exception_bitmap, 752); |
| CHECK_OFFSET(page_fault_error_code_mask, 756); |
| CHECK_OFFSET(page_fault_error_code_match, 760); |
| CHECK_OFFSET(cr3_target_count, 764); |
| CHECK_OFFSET(vm_exit_controls, 768); |
| CHECK_OFFSET(vm_exit_msr_store_count, 772); |
| CHECK_OFFSET(vm_exit_msr_load_count, 776); |
| CHECK_OFFSET(vm_entry_controls, 780); |
| CHECK_OFFSET(vm_entry_msr_load_count, 784); |
| CHECK_OFFSET(vm_entry_intr_info_field, 788); |
| CHECK_OFFSET(vm_entry_exception_error_code, 792); |
| CHECK_OFFSET(vm_entry_instruction_len, 796); |
| CHECK_OFFSET(tpr_threshold, 800); |
| CHECK_OFFSET(secondary_vm_exec_control, 804); |
| CHECK_OFFSET(vm_instruction_error, 808); |
| CHECK_OFFSET(vm_exit_reason, 812); |
| CHECK_OFFSET(vm_exit_intr_info, 816); |
| CHECK_OFFSET(vm_exit_intr_error_code, 820); |
| CHECK_OFFSET(idt_vectoring_info_field, 824); |
| CHECK_OFFSET(idt_vectoring_error_code, 828); |
| CHECK_OFFSET(vm_exit_instruction_len, 832); |
| CHECK_OFFSET(vmx_instruction_info, 836); |
| CHECK_OFFSET(guest_es_limit, 840); |
| CHECK_OFFSET(guest_cs_limit, 844); |
| CHECK_OFFSET(guest_ss_limit, 848); |
| CHECK_OFFSET(guest_ds_limit, 852); |
| CHECK_OFFSET(guest_fs_limit, 856); |
| CHECK_OFFSET(guest_gs_limit, 860); |
| CHECK_OFFSET(guest_ldtr_limit, 864); |
| CHECK_OFFSET(guest_tr_limit, 868); |
| CHECK_OFFSET(guest_gdtr_limit, 872); |
| CHECK_OFFSET(guest_idtr_limit, 876); |
| CHECK_OFFSET(guest_es_ar_bytes, 880); |
| CHECK_OFFSET(guest_cs_ar_bytes, 884); |
| CHECK_OFFSET(guest_ss_ar_bytes, 888); |
| CHECK_OFFSET(guest_ds_ar_bytes, 892); |
| CHECK_OFFSET(guest_fs_ar_bytes, 896); |
| CHECK_OFFSET(guest_gs_ar_bytes, 900); |
| CHECK_OFFSET(guest_ldtr_ar_bytes, 904); |
| CHECK_OFFSET(guest_tr_ar_bytes, 908); |
| CHECK_OFFSET(guest_interruptibility_info, 912); |
| CHECK_OFFSET(guest_activity_state, 916); |
| CHECK_OFFSET(guest_sysenter_cs, 920); |
| CHECK_OFFSET(host_ia32_sysenter_cs, 924); |
| CHECK_OFFSET(vmx_preemption_timer_value, 928); |
| CHECK_OFFSET(virtual_processor_id, 960); |
| CHECK_OFFSET(posted_intr_nv, 962); |
| CHECK_OFFSET(guest_es_selector, 964); |
| CHECK_OFFSET(guest_cs_selector, 966); |
| CHECK_OFFSET(guest_ss_selector, 968); |
| CHECK_OFFSET(guest_ds_selector, 970); |
| CHECK_OFFSET(guest_fs_selector, 972); |
| CHECK_OFFSET(guest_gs_selector, 974); |
| CHECK_OFFSET(guest_ldtr_selector, 976); |
| CHECK_OFFSET(guest_tr_selector, 978); |
| CHECK_OFFSET(guest_intr_status, 980); |
| CHECK_OFFSET(host_es_selector, 982); |
| CHECK_OFFSET(host_cs_selector, 984); |
| CHECK_OFFSET(host_ss_selector, 986); |
| CHECK_OFFSET(host_ds_selector, 988); |
| CHECK_OFFSET(host_fs_selector, 990); |
| CHECK_OFFSET(host_gs_selector, 992); |
| CHECK_OFFSET(host_tr_selector, 994); |
| CHECK_OFFSET(guest_pml_index, 996); |
| } |
| |
| /* |
| * VMCS12_REVISION is an arbitrary id that should be changed if the content or |
| * layout of struct vmcs12 is changed. MSR_IA32_VMX_BASIC returns this id, and |
| * VMPTRLD verifies that the VMCS region that L1 is loading contains this id. |
| * |
| * IMPORTANT: Changing this value will break save/restore compatibility with |
| * older kvm releases. |
| */ |
| #define VMCS12_REVISION 0x11e57ed0 |
| |
| /* |
| * VMCS12_SIZE is the number of bytes L1 should allocate for the VMXON region |
| * and any VMCS region. Although only sizeof(struct vmcs12) are used by the |
| * current implementation, 4K are reserved to avoid future complications. |
| */ |
| #define VMCS12_SIZE 0x1000 |
| |
| /* |
| * VMCS12_MAX_FIELD_INDEX is the highest index value used in any |
| * supported VMCS12 field encoding. |
| */ |
| #define VMCS12_MAX_FIELD_INDEX 0x17 |
| |
| struct nested_vmx_msrs { |
| /* |
| * We only store the "true" versions of the VMX capability MSRs. We |
| * generate the "non-true" versions by setting the must-be-1 bits |
| * according to the SDM. |
| */ |
| u32 procbased_ctls_low; |
| u32 procbased_ctls_high; |
| u32 secondary_ctls_low; |
| u32 secondary_ctls_high; |
| u32 pinbased_ctls_low; |
| u32 pinbased_ctls_high; |
| u32 exit_ctls_low; |
| u32 exit_ctls_high; |
| u32 entry_ctls_low; |
| u32 entry_ctls_high; |
| u32 misc_low; |
| u32 misc_high; |
| u32 ept_caps; |
| u32 vpid_caps; |
| u64 basic; |
| u64 cr0_fixed0; |
| u64 cr0_fixed1; |
| u64 cr4_fixed0; |
| u64 cr4_fixed1; |
| u64 vmcs_enum; |
| u64 vmfunc_controls; |
| }; |
| |
| /* |
| * The nested_vmx structure is part of vcpu_vmx, and holds information we need |
| * for correct emulation of VMX (i.e., nested VMX) on this vcpu. |
| */ |
| struct nested_vmx { |
| /* Has the level1 guest done vmxon? */ |
| bool vmxon; |
| gpa_t vmxon_ptr; |
| bool pml_full; |
| |
| /* The guest-physical address of the current VMCS L1 keeps for L2 */ |
| gpa_t current_vmptr; |
| /* |
| * Cache of the guest's VMCS, existing outside of guest memory. |
| * Loaded from guest memory during VMPTRLD. Flushed to guest |
| * memory during VMCLEAR and VMPTRLD. |
| */ |
| struct vmcs12 *cached_vmcs12; |
| /* |
| * Cache of the guest's shadow VMCS, existing outside of guest |
| * memory. Loaded from guest memory during VM entry. Flushed |
| * to guest memory during VM exit. |
| */ |
| struct vmcs12 *cached_shadow_vmcs12; |
| /* |
| * Indicates if the shadow vmcs must be updated with the |
| * data hold by vmcs12 |
| */ |
| bool sync_shadow_vmcs; |
| bool dirty_vmcs12; |
| |
| /* |
| * vmcs02 has been initialized, i.e. state that is constant for |
| * vmcs02 has been written to the backing VMCS. Initialization |
| * is delayed until L1 actually attempts to run a nested VM. |
| */ |
| bool vmcs02_initialized; |
| |
| bool change_vmcs01_virtual_apic_mode; |
| |
| /* L2 must run next, and mustn't decide to exit to L1. */ |
| bool nested_run_pending; |
| |
| struct loaded_vmcs vmcs02; |
| |
| /* |
| * Guest pages referred to in the vmcs02 with host-physical |
| * pointers, so we must keep them pinned while L2 runs. |
| */ |
| struct page *apic_access_page; |
| struct page *virtual_apic_page; |
| struct page *pi_desc_page; |
| struct pi_desc *pi_desc; |
| bool pi_pending; |
| u16 posted_intr_nv; |
| |
| struct hrtimer preemption_timer; |
| bool preemption_timer_expired; |
| |
| /* to migrate it to L2 if VM_ENTRY_LOAD_DEBUG_CONTROLS is off */ |
| u64 vmcs01_debugctl; |
| u64 vmcs01_guest_bndcfgs; |
| |
| u16 vpid02; |
| u16 last_vpid; |
| |
| struct nested_vmx_msrs msrs; |
| |
| /* SMM related state */ |
| struct { |
| /* in VMX operation on SMM entry? */ |
| bool vmxon; |
| /* in guest mode on SMM entry? */ |
| bool guest_mode; |
| } smm; |
| }; |
| |
| #define POSTED_INTR_ON 0 |
| #define POSTED_INTR_SN 1 |
| |
| /* Posted-Interrupt Descriptor */ |
| struct pi_desc { |
| u32 pir[8]; /* Posted interrupt requested */ |
| union { |
| struct { |
| /* bit 256 - Outstanding Notification */ |
| u16 on : 1, |
| /* bit 257 - Suppress Notification */ |
| sn : 1, |
| /* bit 271:258 - Reserved */ |
| rsvd_1 : 14; |
| /* bit 279:272 - Notification Vector */ |
| u8 nv; |
| /* bit 287:280 - Reserved */ |
| u8 rsvd_2; |
| /* bit 319:288 - Notification Destination */ |
| u32 ndst; |
| }; |
| u64 control; |
| }; |
| u32 rsvd[6]; |
| } __aligned(64); |
| |
| static bool pi_test_and_set_on(struct pi_desc *pi_desc) |
| { |
| return test_and_set_bit(POSTED_INTR_ON, |
| (unsigned long *)&pi_desc->control); |
| } |
| |
| static bool pi_test_and_clear_on(struct pi_desc *pi_desc) |
| { |
| return test_and_clear_bit(POSTED_INTR_ON, |
| (unsigned long *)&pi_desc->control); |
| } |
| |
| static int pi_test_and_set_pir(int vector, struct pi_desc *pi_desc) |
| { |
| return test_and_set_bit(vector, (unsigned long *)pi_desc->pir); |
| } |
| |
| static inline void pi_clear_sn(struct pi_desc *pi_desc) |
| { |
| return clear_bit(POSTED_INTR_SN, |
| (unsigned long *)&pi_desc->control); |
| } |
| |
| static inline void pi_set_sn(struct pi_desc *pi_desc) |
| { |
| return set_bit(POSTED_INTR_SN, |
| (unsigned long *)&pi_desc->control); |
| } |
| |
| static inline void pi_clear_on(struct pi_desc *pi_desc) |
| { |
| clear_bit(POSTED_INTR_ON, |
| (unsigned long *)&pi_desc->control); |
| } |
| |
| static inline int pi_test_on(struct pi_desc *pi_desc) |
| { |
| return test_bit(POSTED_INTR_ON, |
| (unsigned long *)&pi_desc->control); |
| } |
| |
| static inline int pi_test_sn(struct pi_desc *pi_desc) |
| { |
| return test_bit(POSTED_INTR_SN, |
| (unsigned long *)&pi_desc->control); |
| } |
| |
| struct vmx_msrs { |
| unsigned int nr; |
| struct vmx_msr_entry val[NR_AUTOLOAD_MSRS]; |
| }; |
| |
| struct vcpu_vmx { |
| struct kvm_vcpu vcpu; |
| unsigned long host_rsp; |
| u8 fail; |
| u8 msr_bitmap_mode; |
| u32 exit_intr_info; |
| u32 idt_vectoring_info; |
| ulong rflags; |
| struct shared_msr_entry *guest_msrs; |
| int nmsrs; |
| int save_nmsrs; |
| unsigned long host_idt_base; |
| #ifdef CONFIG_X86_64 |
| u64 msr_host_kernel_gs_base; |
| u64 msr_guest_kernel_gs_base; |
| #endif |
| |
| u64 arch_capabilities; |
| u64 spec_ctrl; |
| |
| u32 vm_entry_controls_shadow; |
| u32 vm_exit_controls_shadow; |
| u32 secondary_exec_control; |
| |
| /* |
| * loaded_vmcs points to the VMCS currently used in this vcpu. For a |
| * non-nested (L1) guest, it always points to vmcs01. For a nested |
| * guest (L2), it points to a different VMCS. loaded_cpu_state points |
| * to the VMCS whose state is loaded into the CPU registers that only |
| * need to be switched when transitioning to/from the kernel; a NULL |
| * value indicates that host state is loaded. |
| */ |
| struct loaded_vmcs vmcs01; |
| struct loaded_vmcs *loaded_vmcs; |
| struct loaded_vmcs *loaded_cpu_state; |
| bool __launched; /* temporary, used in vmx_vcpu_run */ |
| struct msr_autoload { |
| struct vmx_msrs guest; |
| struct vmx_msrs host; |
| } msr_autoload; |
| |
| struct { |
| int vm86_active; |
| ulong save_rflags; |
| struct kvm_segment segs[8]; |
| } rmode; |
| struct { |
| u32 bitmask; /* 4 bits per segment (1 bit per field) */ |
| struct kvm_save_segment { |
| u16 selector; |
| unsigned long base; |
| u32 limit; |
| u32 ar; |
| } seg[8]; |
| } segment_cache; |
| int vpid; |
| bool emulation_required; |
| |
| u32 exit_reason; |
| |
| /* Posted interrupt descriptor */ |
| struct pi_desc pi_desc; |
| |
| /* Support for a guest hypervisor (nested VMX) */ |
| struct nested_vmx nested; |
| |
| /* Dynamic PLE window. */ |
| int ple_window; |
| bool ple_window_dirty; |
| |
| bool req_immediate_exit; |
| |
| /* Support for PML */ |
| #define PML_ENTITY_NUM 512 |
| struct page *pml_pg; |
| |
| /* apic deadline value in host tsc */ |
| u64 hv_deadline_tsc; |
| |
| u64 current_tsc_ratio; |
| |
| u32 host_pkru; |
| |
| unsigned long host_debugctlmsr; |
| |
| /* |
| * Only bits masked by msr_ia32_feature_control_valid_bits can be set in |
| * msr_ia32_feature_control. FEATURE_CONTROL_LOCKED is always included |
| * in msr_ia32_feature_control_valid_bits. |
| */ |
| u64 msr_ia32_feature_control; |
| u64 msr_ia32_feature_control_valid_bits; |
| u64 ept_pointer; |
| }; |
| |
| enum segment_cache_field { |
| SEG_FIELD_SEL = 0, |
| SEG_FIELD_BASE = 1, |
| SEG_FIELD_LIMIT = 2, |
| SEG_FIELD_AR = 3, |
| |
| SEG_FIELD_NR = 4 |
| }; |
| |
| static inline struct kvm_vmx *to_kvm_vmx(struct kvm *kvm) |
| { |
| return container_of(kvm, struct kvm_vmx, kvm); |
| } |
| |
| static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu) |
| { |
| return container_of(vcpu, struct vcpu_vmx, vcpu); |
| } |
| |
| static struct pi_desc *vcpu_to_pi_desc(struct kvm_vcpu *vcpu) |
| { |
| return &(to_vmx(vcpu)->pi_desc); |
| } |
| |
| #define ROL16(val, n) ((u16)(((u16)(val) << (n)) | ((u16)(val) >> (16 - (n))))) |
| #define VMCS12_OFFSET(x) offsetof(struct vmcs12, x) |
| #define FIELD(number, name) [ROL16(number, 6)] = VMCS12_OFFSET(name) |
| #define FIELD64(number, name) \ |
| FIELD(number, name), \ |
| [ROL16(number##_HIGH, 6)] = VMCS12_OFFSET(name) + sizeof(u32) |
| |
| |
| static u16 shadow_read_only_fields[] = { |
| #define SHADOW_FIELD_RO(x) x, |
| #include "vmx_shadow_fields.h" |
| }; |
| static int max_shadow_read_only_fields = |
| ARRAY_SIZE(shadow_read_only_fields); |
| |
| static u16 shadow_read_write_fields[] = { |
| #define SHADOW_FIELD_RW(x) x, |
| #include "vmx_shadow_fields.h" |
| }; |
| static int max_shadow_read_write_fields = |
| ARRAY_SIZE(shadow_read_write_fields); |
| |
| static const unsigned short vmcs_field_to_offset_table[] = { |
| FIELD(VIRTUAL_PROCESSOR_ID, virtual_processor_id), |
| FIELD(POSTED_INTR_NV, posted_intr_nv), |
| FIELD(GUEST_ES_SELECTOR, guest_es_selector), |
| FIELD(GUEST_CS_SELECTOR, guest_cs_selector), |
| FIELD(GUEST_SS_SELECTOR, guest_ss_selector), |
| FIELD(GUEST_DS_SELECTOR, guest_ds_selector), |
| FIELD(GUEST_FS_SELECTOR, guest_fs_selector), |
| FIELD(GUEST_GS_SELECTOR, guest_gs_selector), |
| FIELD(GUEST_LDTR_SELECTOR, guest_ldtr_selector), |
| FIELD(GUEST_TR_SELECTOR, guest_tr_selector), |
| FIELD(GUEST_INTR_STATUS, guest_intr_status), |
| FIELD(GUEST_PML_INDEX, guest_pml_index), |
| FIELD(HOST_ES_SELECTOR, host_es_selector), |
| FIELD(HOST_CS_SELECTOR, host_cs_selector), |
| FIELD(HOST_SS_SELECTOR, host_ss_selector), |
| FIELD(HOST_DS_SELECTOR, host_ds_selector), |
| FIELD(HOST_FS_SELECTOR, host_fs_selector), |
| FIELD(HOST_GS_SELECTOR, host_gs_selector), |
| FIELD(HOST_TR_SELECTOR, host_tr_selector), |
| FIELD64(IO_BITMAP_A, io_bitmap_a), |
| FIELD64(IO_BITMAP_B, io_bitmap_b), |
| FIELD64(MSR_BITMAP, msr_bitmap), |
| FIELD64(VM_EXIT_MSR_STORE_ADDR, vm_exit_msr_store_addr), |
| FIELD64(VM_EXIT_MSR_LOAD_ADDR, vm_exit_msr_load_addr), |
| FIELD64(VM_ENTRY_MSR_LOAD_ADDR, vm_entry_msr_load_addr), |
| FIELD64(PML_ADDRESS, pml_address), |
| FIELD64(TSC_OFFSET, tsc_offset), |
| FIELD64(VIRTUAL_APIC_PAGE_ADDR, virtual_apic_page_addr), |
| FIELD64(APIC_ACCESS_ADDR, apic_access_addr), |
| FIELD64(POSTED_INTR_DESC_ADDR, posted_intr_desc_addr), |
| FIELD64(VM_FUNCTION_CONTROL, vm_function_control), |
| FIELD64(EPT_POINTER, ept_pointer), |
| FIELD64(EOI_EXIT_BITMAP0, eoi_exit_bitmap0), |
| FIELD64(EOI_EXIT_BITMAP1, eoi_exit_bitmap1), |
| FIELD64(EOI_EXIT_BITMAP2, eoi_exit_bitmap2), |
| FIELD64(EOI_EXIT_BITMAP3, eoi_exit_bitmap3), |
| FIELD64(EPTP_LIST_ADDRESS, eptp_list_address), |
| FIELD64(VMREAD_BITMAP, vmread_bitmap), |
| FIELD64(VMWRITE_BITMAP, vmwrite_bitmap), |
| FIELD64(XSS_EXIT_BITMAP, xss_exit_bitmap), |
| FIELD64(GUEST_PHYSICAL_ADDRESS, guest_physical_address), |
| FIELD64(VMCS_LINK_POINTER, vmcs_link_pointer), |
| FIELD64(GUEST_IA32_DEBUGCTL, guest_ia32_debugctl), |
| FIELD64(GUEST_IA32_PAT, guest_ia32_pat), |
| FIELD64(GUEST_IA32_EFER, guest_ia32_efer), |
| FIELD64(GUEST_IA32_PERF_GLOBAL_CTRL, guest_ia32_perf_global_ctrl), |
| FIELD64(GUEST_PDPTR0, guest_pdptr0), |
| FIELD64(GUEST_PDPTR1, guest_pdptr1), |
| FIELD64(GUEST_PDPTR2, guest_pdptr2), |
| FIELD64(GUEST_PDPTR3, guest_pdptr3), |
| FIELD64(GUEST_BNDCFGS, guest_bndcfgs), |
| FIELD64(HOST_IA32_PAT, host_ia32_pat), |
| FIELD64(HOST_IA32_EFER, host_ia32_efer), |
| FIELD64(HOST_IA32_PERF_GLOBAL_CTRL, host_ia32_perf_global_ctrl), |
| FIELD(PIN_BASED_VM_EXEC_CONTROL, pin_based_vm_exec_control), |
| FIELD(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control), |
| FIELD(EXCEPTION_BITMAP, exception_bitmap), |
| FIELD(PAGE_FAULT_ERROR_CODE_MASK, page_fault_error_code_mask), |
| FIELD(PAGE_FAULT_ERROR_CODE_MATCH, page_fault_error_code_match), |
| FIELD(CR3_TARGET_COUNT, cr3_target_count), |
| FIELD(VM_EXIT_CONTROLS, vm_exit_controls), |
| FIELD(VM_EXIT_MSR_STORE_COUNT, vm_exit_msr_store_count), |
| FIELD(VM_EXIT_MSR_LOAD_COUNT, vm_exit_msr_load_count), |
| FIELD(VM_ENTRY_CONTROLS, vm_entry_controls), |
| FIELD(VM_ENTRY_MSR_LOAD_COUNT, vm_entry_msr_load_count), |
| FIELD(VM_ENTRY_INTR_INFO_FIELD, vm_entry_intr_info_field), |
| FIELD(VM_ENTRY_EXCEPTION_ERROR_CODE, vm_entry_exception_error_code), |
| FIELD(VM_ENTRY_INSTRUCTION_LEN, vm_entry_instruction_len), |
| FIELD(TPR_THRESHOLD, tpr_threshold), |
| FIELD(SECONDARY_VM_EXEC_CONTROL, secondary_vm_exec_control), |
| FIELD(VM_INSTRUCTION_ERROR, vm_instruction_error), |
| FIELD(VM_EXIT_REASON, vm_exit_reason), |
| FIELD(VM_EXIT_INTR_INFO, vm_exit_intr_info), |
| FIELD(VM_EXIT_INTR_ERROR_CODE, vm_exit_intr_error_code), |
| FIELD(IDT_VECTORING_INFO_FIELD, idt_vectoring_info_field), |
| FIELD(IDT_VECTORING_ERROR_CODE, idt_vectoring_error_code), |
| FIELD(VM_EXIT_INSTRUCTION_LEN, vm_exit_instruction_len), |
| FIELD(VMX_INSTRUCTION_INFO, vmx_instruction_info), |
| FIELD(GUEST_ES_LIMIT, guest_es_limit), |
| FIELD(GUEST_CS_LIMIT, guest_cs_limit), |
| FIELD(GUEST_SS_LIMIT, guest_ss_limit), |
| FIELD(GUEST_DS_LIMIT, guest_ds_limit), |
| FIELD(GUEST_FS_LIMIT, guest_fs_limit), |
| FIELD(GUEST_GS_LIMIT, guest_gs_limit), |
| FIELD(GUEST_LDTR_LIMIT, guest_ldtr_limit), |
| FIELD(GUEST_TR_LIMIT, guest_tr_limit), |
| FIELD(GUEST_GDTR_LIMIT, guest_gdtr_limit), |
| FIELD(GUEST_IDTR_LIMIT, guest_idtr_limit), |
| FIELD(GUEST_ES_AR_BYTES, guest_es_ar_bytes), |
| FIELD(GUEST_CS_AR_BYTES, guest_cs_ar_bytes), |
| FIELD(GUEST_SS_AR_BYTES, guest_ss_ar_bytes), |
| FIELD(GUEST_DS_AR_BYTES, guest_ds_ar_bytes), |
| FIELD(GUEST_FS_AR_BYTES, guest_fs_ar_bytes), |
| FIELD(GUEST_GS_AR_BYTES, guest_gs_ar_bytes), |
| FIELD(GUEST_LDTR_AR_BYTES, guest_ldtr_ar_bytes), |
| FIELD(GUEST_TR_AR_BYTES, guest_tr_ar_bytes), |
| FIELD(GUEST_INTERRUPTIBILITY_INFO, guest_interruptibility_info), |
| FIELD(GUEST_ACTIVITY_STATE, guest_activity_state), |
| FIELD(GUEST_SYSENTER_CS, guest_sysenter_cs), |
| FIELD(HOST_IA32_SYSENTER_CS, host_ia32_sysenter_cs), |
| FIELD(VMX_PREEMPTION_TIMER_VALUE, vmx_preemption_timer_value), |
| FIELD(CR0_GUEST_HOST_MASK, cr0_guest_host_mask), |
| FIELD(CR4_GUEST_HOST_MASK, cr4_guest_host_mask), |
| FIELD(CR0_READ_SHADOW, cr0_read_shadow), |
| FIELD(CR4_READ_SHADOW, cr4_read_shadow), |
| FIELD(CR3_TARGET_VALUE0, cr3_target_value0), |
| FIELD(CR3_TARGET_VALUE1, cr3_target_value1), |
| FIELD(CR3_TARGET_VALUE2, cr3_target_value2), |
| FIELD(CR3_TARGET_VALUE3, cr3_target_value3), |
| FIELD(EXIT_QUALIFICATION, exit_qualification), |
| FIELD(GUEST_LINEAR_ADDRESS, guest_linear_address), |
| FIELD(GUEST_CR0, guest_cr0), |
| FIELD(GUEST_CR3, guest_cr3), |
| FIELD(GUEST_CR4, guest_cr4), |
| FIELD(GUEST_ES_BASE, guest_es_base), |
| FIELD(GUEST_CS_BASE, guest_cs_base), |
| FIELD(GUEST_SS_BASE, guest_ss_base), |
| FIELD(GUEST_DS_BASE, guest_ds_base), |
| FIELD(GUEST_FS_BASE, guest_fs_base), |
| FIELD(GUEST_GS_BASE, guest_gs_base), |
| FIELD(GUEST_LDTR_BASE, guest_ldtr_base), |
| FIELD(GUEST_TR_BASE, guest_tr_base), |
| FIELD(GUEST_GDTR_BASE, guest_gdtr_base), |
| FIELD(GUEST_IDTR_BASE, guest_idtr_base), |
| FIELD(GUEST_DR7, guest_dr7), |
| FIELD(GUEST_RSP, guest_rsp), |
| FIELD(GUEST_RIP, guest_rip), |
| FIELD(GUEST_RFLAGS, guest_rflags), |
| FIELD(GUEST_PENDING_DBG_EXCEPTIONS, guest_pending_dbg_exceptions), |
| FIELD(GUEST_SYSENTER_ESP, guest_sysenter_esp), |
| FIELD(GUEST_SYSENTER_EIP, guest_sysenter_eip), |
| FIELD(HOST_CR0, host_cr0), |
| FIELD(HOST_CR3, host_cr3), |
| FIELD(HOST_CR4, host_cr4), |
| FIELD(HOST_FS_BASE, host_fs_base), |
| FIELD(HOST_GS_BASE, host_gs_base), |
| FIELD(HOST_TR_BASE, host_tr_base), |
| FIELD(HOST_GDTR_BASE, host_gdtr_base), |
| FIELD(HOST_IDTR_BASE, host_idtr_base), |
| FIELD(HOST_IA32_SYSENTER_ESP, host_ia32_sysenter_esp), |
| FIELD(HOST_IA32_SYSENTER_EIP, host_ia32_sysenter_eip), |
| FIELD(HOST_RSP, host_rsp), |
| FIELD(HOST_RIP, host_rip), |
| }; |
| |
| static inline short vmcs_field_to_offset(unsigned long field) |
| { |
| const size_t size = ARRAY_SIZE(vmcs_field_to_offset_table); |
| unsigned short offset; |
| unsigned index; |
| |
| if (field >> 15) |
| return -ENOENT; |
| |
| index = ROL16(field, 6); |
| if (index >= size) |
| return -ENOENT; |
| |
| index = array_index_nospec(index, size); |
| offset = vmcs_field_to_offset_table[index]; |
| if (offset == 0) |
| return -ENOENT; |
| return offset; |
| } |
| |
| static inline struct vmcs12 *get_vmcs12(struct kvm_vcpu *vcpu) |
| { |
| return to_vmx(vcpu)->nested.cached_vmcs12; |
| } |
| |
| static inline struct vmcs12 *get_shadow_vmcs12(struct kvm_vcpu *vcpu) |
| { |
| return to_vmx(vcpu)->nested.cached_shadow_vmcs12; |
| } |
| |
| static bool nested_ept_ad_enabled(struct kvm_vcpu *vcpu); |
| static unsigned long nested_ept_get_cr3(struct kvm_vcpu *vcpu); |
| static u64 construct_eptp(struct kvm_vcpu *vcpu, unsigned long root_hpa); |
| static bool vmx_xsaves_supported(void); |
| static void vmx_set_segment(struct kvm_vcpu *vcpu, |
| struct kvm_segment *var, int seg); |
| static void vmx_get_segment(struct kvm_vcpu *vcpu, |
| struct kvm_segment *var, int seg); |
| static bool guest_state_valid(struct kvm_vcpu *vcpu); |
| static u32 vmx_segment_access_rights(struct kvm_segment *var); |
| static void copy_shadow_to_vmcs12(struct vcpu_vmx *vmx); |
| static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu); |
| static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked); |
| static bool nested_vmx_is_page_fault_vmexit(struct vmcs12 *vmcs12, |
| u16 error_code); |
| static void vmx_update_msr_bitmap(struct kvm_vcpu *vcpu); |
| static void __always_inline vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, |
| u32 msr, int type); |
| |
| static DEFINE_PER_CPU(struct vmcs *, vmxarea); |
| static DEFINE_PER_CPU(struct vmcs *, current_vmcs); |
| /* |
| * We maintain a per-CPU linked-list of VMCS loaded on that CPU. This is needed |
| * when a CPU is brought down, and we need to VMCLEAR all VMCSs loaded on it. |
| */ |
| static DEFINE_PER_CPU(struct list_head, loaded_vmcss_on_cpu); |
| |
| /* |
| * We maintian a per-CPU linked-list of vCPU, so in wakeup_handler() we |
| * can find which vCPU should be waken up. |
| */ |
| static DEFINE_PER_CPU(struct list_head, blocked_vcpu_on_cpu); |
| static DEFINE_PER_CPU(spinlock_t, blocked_vcpu_on_cpu_lock); |
| |
| enum { |
| VMX_VMREAD_BITMAP, |
| VMX_VMWRITE_BITMAP, |
| VMX_BITMAP_NR |
| }; |
| |
| static unsigned long *vmx_bitmap[VMX_BITMAP_NR]; |
| |
| #define vmx_vmread_bitmap (vmx_bitmap[VMX_VMREAD_BITMAP]) |
| #define vmx_vmwrite_bitmap (vmx_bitmap[VMX_VMWRITE_BITMAP]) |
| |
| static bool cpu_has_load_ia32_efer; |
| static bool cpu_has_load_perf_global_ctrl; |
| |
| static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS); |
| static DEFINE_SPINLOCK(vmx_vpid_lock); |
| |
| static struct vmcs_config { |
| int size; |
| int order; |
| u32 basic_cap; |
| u32 revision_id; |
| u32 pin_based_exec_ctrl; |
| u32 cpu_based_exec_ctrl; |
| u32 cpu_based_2nd_exec_ctrl; |
| u32 vmexit_ctrl; |
| u32 vmentry_ctrl; |
| struct nested_vmx_msrs nested; |
| } vmcs_config; |
| |
| static struct vmx_capability { |
| u32 ept; |
| u32 vpid; |
| } vmx_capability; |
| |
| #define VMX_SEGMENT_FIELD(seg) \ |
| [VCPU_SREG_##seg] = { \ |
| .selector = GUEST_##seg##_SELECTOR, \ |
| .base = GUEST_##seg##_BASE, \ |
| .limit = GUEST_##seg##_LIMIT, \ |
| .ar_bytes = GUEST_##seg##_AR_BYTES, \ |
| } |
| |
| static const struct kvm_vmx_segment_field { |
| unsigned selector; |
| unsigned base; |
| unsigned limit; |
| unsigned ar_bytes; |
| } kvm_vmx_segment_fields[] = { |
| VMX_SEGMENT_FIELD(CS), |
| VMX_SEGMENT_FIELD(DS), |
| VMX_SEGMENT_FIELD(ES), |
| VMX_SEGMENT_FIELD(FS), |
| VMX_SEGMENT_FIELD(GS), |
| VMX_SEGMENT_FIELD(SS), |
| VMX_SEGMENT_FIELD(TR), |
| VMX_SEGMENT_FIELD(LDTR), |
| }; |
| |
| static u64 host_efer; |
| |
| static void ept_save_pdptrs(struct kvm_vcpu *vcpu); |
| |
| /* |
| * Keep MSR_STAR at the end, as setup_msrs() will try to optimize it |
| * away by decrementing the array size. |
| */ |
| static const u32 vmx_msr_index[] = { |
| #ifdef CONFIG_X86_64 |
| MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, |
| #endif |
| MSR_EFER, MSR_TSC_AUX, MSR_STAR, |
| }; |
| |
| DEFINE_STATIC_KEY_FALSE(enable_evmcs); |
| |
| #define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs)) |
| |
| #define KVM_EVMCS_VERSION 1 |
| |
| #if IS_ENABLED(CONFIG_HYPERV) |
| static bool __read_mostly enlightened_vmcs = true; |
| module_param(enlightened_vmcs, bool, 0444); |
| |
| static inline void evmcs_write64(unsigned long field, u64 value) |
| { |
| u16 clean_field; |
| int offset = get_evmcs_offset(field, &clean_field); |
| |
| if (offset < 0) |
| return; |
| |
| *(u64 *)((char *)current_evmcs + offset) = value; |
| |
| current_evmcs->hv_clean_fields &= ~clean_field; |
| } |
| |
| static inline void evmcs_write32(unsigned long field, u32 value) |
| { |
| u16 clean_field; |
| int offset = get_evmcs_offset(field, &clean_field); |
| |
| if (offset < 0) |
| return; |
| |
| *(u32 *)((char *)current_evmcs + offset) = value; |
| current_evmcs->hv_clean_fields &= ~clean_field; |
| } |
| |
| static inline void evmcs_write16(unsigned long field, u16 value) |
| { |
| u16 clean_field; |
| int offset = get_evmcs_offset(field, &clean_field); |
| |
| if (offset < 0) |
| return; |
| |
| *(u16 *)((char *)current_evmcs + offset) = value; |
| current_evmcs->hv_clean_fields &= ~clean_field; |
| } |
| |
| static inline u64 evmcs_read64(unsigned long field) |
| { |
| int offset = get_evmcs_offset(field, NULL); |
| |
| if (offset < 0) |
| return 0; |
| |
| return *(u64 *)((char *)current_evmcs + offset); |
| } |
| |
| static inline u32 evmcs_read32(unsigned long field) |
| { |
| int offset = get_evmcs_offset(field, NULL); |
| |
| if (offset < 0) |
| return 0; |
| |
| return *(u32 *)((char *)current_evmcs + offset); |
| } |
| |
| static inline u16 evmcs_read16(unsigned long field) |
| { |
| int offset = get_evmcs_offset(field, NULL); |
| |
| if (offset < 0) |
| return 0; |
| |
| return *(u16 *)((char *)current_evmcs + offset); |
| } |
| |
| static inline void evmcs_touch_msr_bitmap(void) |
| { |
| if (unlikely(!current_evmcs)) |
| return; |
| |
| if (current_evmcs->hv_enlightenments_control.msr_bitmap) |
| current_evmcs->hv_clean_fields &= |
| ~HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP; |
| } |
| |
| static void evmcs_load(u64 phys_addr) |
| { |
| struct hv_vp_assist_page *vp_ap = |
| hv_get_vp_assist_page(smp_processor_id()); |
| |
| vp_ap->current_nested_vmcs = phys_addr; |
| vp_ap->enlighten_vmentry = 1; |
| } |
| |
| static void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf) |
| { |
| /* |
| * Enlightened VMCSv1 doesn't support these: |
| * |
| * POSTED_INTR_NV = 0x00000002, |
| * GUEST_INTR_STATUS = 0x00000810, |
| * APIC_ACCESS_ADDR = 0x00002014, |
| * POSTED_INTR_DESC_ADDR = 0x00002016, |
| * EOI_EXIT_BITMAP0 = 0x0000201c, |
| * EOI_EXIT_BITMAP1 = 0x0000201e, |
| * EOI_EXIT_BITMAP2 = 0x00002020, |
| * EOI_EXIT_BITMAP3 = 0x00002022, |
| */ |
| vmcs_conf->pin_based_exec_ctrl &= ~PIN_BASED_POSTED_INTR; |
| vmcs_conf->cpu_based_2nd_exec_ctrl &= |
| ~SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY; |
| vmcs_conf->cpu_based_2nd_exec_ctrl &= |
| ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; |
| vmcs_conf->cpu_based_2nd_exec_ctrl &= |
| ~SECONDARY_EXEC_APIC_REGISTER_VIRT; |
| |
| /* |
| * GUEST_PML_INDEX = 0x00000812, |
| * PML_ADDRESS = 0x0000200e, |
| */ |
| vmcs_conf->cpu_based_2nd_exec_ctrl &= ~SECONDARY_EXEC_ENABLE_PML; |
| |
| /* VM_FUNCTION_CONTROL = 0x00002018, */ |
| vmcs_conf->cpu_based_2nd_exec_ctrl &= ~SECONDARY_EXEC_ENABLE_VMFUNC; |
| |
| /* |
| * EPTP_LIST_ADDRESS = 0x00002024, |
| * VMREAD_BITMAP = 0x00002026, |
| * VMWRITE_BITMAP = 0x00002028, |
| */ |
| vmcs_conf->cpu_based_2nd_exec_ctrl &= ~SECONDARY_EXEC_SHADOW_VMCS; |
| |
| /* |
| * TSC_MULTIPLIER = 0x00002032, |
| */ |
| vmcs_conf->cpu_based_2nd_exec_ctrl &= ~SECONDARY_EXEC_TSC_SCALING; |
| |
| /* |
| * PLE_GAP = 0x00004020, |
| * PLE_WINDOW = 0x00004022, |
| */ |
| vmcs_conf->cpu_based_2nd_exec_ctrl &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING; |
| |
| /* |
| * VMX_PREEMPTION_TIMER_VALUE = 0x0000482E, |
| */ |
| vmcs_conf->pin_based_exec_ctrl &= ~PIN_BASED_VMX_PREEMPTION_TIMER; |
| |
| /* |
| * GUEST_IA32_PERF_GLOBAL_CTRL = 0x00002808, |
| * HOST_IA32_PERF_GLOBAL_CTRL = 0x00002c04, |
| */ |
| vmcs_conf->vmexit_ctrl &= ~VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL; |
| vmcs_conf->vmentry_ctrl &= ~VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL; |
| |
| /* |
| * Currently unsupported in KVM: |
| * GUEST_IA32_RTIT_CTL = 0x00002814, |
| */ |
| } |
| |
| /* check_ept_pointer() should be under protection of ept_pointer_lock. */ |
| static void check_ept_pointer_match(struct kvm *kvm) |
| { |
| struct kvm_vcpu *vcpu; |
| u64 tmp_eptp = INVALID_PAGE; |
| int i; |
| |
| kvm_for_each_vcpu(i, vcpu, kvm) { |
| if (!VALID_PAGE(tmp_eptp)) { |
| tmp_eptp = to_vmx(vcpu)->ept_pointer; |
| } else if (tmp_eptp != to_vmx(vcpu)->ept_pointer) { |
| to_kvm_vmx(kvm)->ept_pointers_match |
| = EPT_POINTERS_MISMATCH; |
| return; |
| } |
| } |
| |
| to_kvm_vmx(kvm)->ept_pointers_match = EPT_POINTERS_MATCH; |
| } |
| |
| static int vmx_hv_remote_flush_tlb(struct kvm *kvm) |
| { |
| int ret; |
| |
| spin_lock(&to_kvm_vmx(kvm)->ept_pointer_lock); |
| |
| if (to_kvm_vmx(kvm)->ept_pointers_match == EPT_POINTERS_CHECK) |
| check_ept_pointer_match(kvm); |
| |
| if (to_kvm_vmx(kvm)->ept_pointers_match != EPT_POINTERS_MATCH) { |
| ret = -ENOTSUPP; |
| goto out; |
| } |
| |
| ret = hyperv_flush_guest_mapping( |
| to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer); |
| |
| out: |
| spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock); |
| return ret; |
| } |
| #else /* !IS_ENABLED(CONFIG_HYPERV) */ |
| static inline void evmcs_write64(unsigned long field, u64 value) {} |
| static inline void evmcs_write32(unsigned long field, u32 value) {} |
| static inline void evmcs_write16(unsigned long field, u16 value) {} |
| static inline u64 evmcs_read64(unsigned long field) { return 0; } |
| static inline u32 evmcs_read32(unsigned long field) { return 0; } |
| static inline u16 evmcs_read16(unsigned long field) { return 0; } |
| static inline void evmcs_load(u64 phys_addr) {} |
| static inline void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf) {} |
| static inline void evmcs_touch_msr_bitmap(void) {} |
| #endif /* IS_ENABLED(CONFIG_HYPERV) */ |
| |
| static inline bool is_exception_n(u32 intr_info, u8 vector) |
| { |
| return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | |
| INTR_INFO_VALID_MASK)) == |
| (INTR_TYPE_HARD_EXCEPTION | vector | INTR_INFO_VALID_MASK); |
| } |
| |
| static inline bool is_debug(u32 intr_info) |
| { |
| return is_exception_n(intr_info, DB_VECTOR); |
| } |
| |
| static inline bool is_breakpoint(u32 intr_info) |
| { |
| return is_exception_n(intr_info, BP_VECTOR); |
| } |
| |
| static inline bool is_page_fault(u32 intr_info) |
| { |
| return is_exception_n(intr_info, PF_VECTOR); |
| } |
| |
| static inline bool is_invalid_opcode(u32 intr_info) |
| { |
| return is_exception_n(intr_info, UD_VECTOR); |
| } |
| |
| static inline bool is_gp_fault(u32 intr_info) |
| { |
| return is_exception_n(intr_info, GP_VECTOR); |
| } |
| |
| static inline bool is_machine_check(u32 intr_info) |
| { |
| return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | |
| INTR_INFO_VALID_MASK)) == |
| (INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK); |
| } |
| |
| /* Undocumented: icebp/int1 */ |
| static inline bool is_icebp(u32 intr_info) |
| { |
| return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK)) |
| == (INTR_TYPE_PRIV_SW_EXCEPTION | INTR_INFO_VALID_MASK); |
| } |
| |
| static inline bool cpu_has_vmx_msr_bitmap(void) |
| { |
| return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS; |
| } |
| |
| static inline bool cpu_has_vmx_tpr_shadow(void) |
| { |
| return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW; |
| } |
| |
| static inline bool cpu_need_tpr_shadow(struct kvm_vcpu *vcpu) |
| { |
| return cpu_has_vmx_tpr_shadow() && lapic_in_kernel(vcpu); |
| } |
| |
| static inline bool cpu_has_secondary_exec_ctrls(void) |
| { |
| return vmcs_config.cpu_based_exec_ctrl & |
| CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; |
| } |
| |
| static inline bool cpu_has_vmx_virtualize_apic_accesses(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; |
| } |
| |
| static inline bool cpu_has_vmx_virtualize_x2apic_mode(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE; |
| } |
| |
| static inline bool cpu_has_vmx_apic_register_virt(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_APIC_REGISTER_VIRT; |
| } |
| |
| static inline bool cpu_has_vmx_virtual_intr_delivery(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY; |
| } |
| |
| static inline bool cpu_has_vmx_encls_vmexit(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_ENCLS_EXITING; |
| } |
| |
| /* |
| * Comment's format: document - errata name - stepping - processor name. |
| * Refer from |
| * https://www.virtualbox.org/svn/vbox/trunk/src/VBox/VMM/VMMR0/HMR0.cpp |
| */ |
| static u32 vmx_preemption_cpu_tfms[] = { |
| /* 323344.pdf - BA86 - D0 - Xeon 7500 Series */ |
| 0x000206E6, |
| /* 323056.pdf - AAX65 - C2 - Xeon L3406 */ |
| /* 322814.pdf - AAT59 - C2 - i7-600, i5-500, i5-400 and i3-300 Mobile */ |
| /* 322911.pdf - AAU65 - C2 - i5-600, i3-500 Desktop and Pentium G6950 */ |
| 0x00020652, |
| /* 322911.pdf - AAU65 - K0 - i5-600, i3-500 Desktop and Pentium G6950 */ |
| 0x00020655, |
| /* 322373.pdf - AAO95 - B1 - Xeon 3400 Series */ |
| /* 322166.pdf - AAN92 - B1 - i7-800 and i5-700 Desktop */ |
| /* |
| * 320767.pdf - AAP86 - B1 - |
| * i7-900 Mobile Extreme, i7-800 and i7-700 Mobile |
| */ |
| 0x000106E5, |
| /* 321333.pdf - AAM126 - C0 - Xeon 3500 */ |
| 0x000106A0, |
| /* 321333.pdf - AAM126 - C1 - Xeon 3500 */ |
| 0x000106A1, |
| /* 320836.pdf - AAJ124 - C0 - i7-900 Desktop Extreme and i7-900 Desktop */ |
| 0x000106A4, |
| /* 321333.pdf - AAM126 - D0 - Xeon 3500 */ |
| /* 321324.pdf - AAK139 - D0 - Xeon 5500 */ |
| /* 320836.pdf - AAJ124 - D0 - i7-900 Extreme and i7-900 Desktop */ |
| 0x000106A5, |
| }; |
| |
| static inline bool cpu_has_broken_vmx_preemption_timer(void) |
| { |
| u32 eax = cpuid_eax(0x00000001), i; |
| |
| /* Clear the reserved bits */ |
| eax &= ~(0x3U << 14 | 0xfU << 28); |
| for (i = 0; i < ARRAY_SIZE(vmx_preemption_cpu_tfms); i++) |
| if (eax == vmx_preemption_cpu_tfms[i]) |
| return true; |
| |
| return false; |
| } |
| |
| static inline bool cpu_has_vmx_preemption_timer(void) |
| { |
| return vmcs_config.pin_based_exec_ctrl & |
| PIN_BASED_VMX_PREEMPTION_TIMER; |
| } |
| |
| static inline bool cpu_has_vmx_posted_intr(void) |
| { |
| return IS_ENABLED(CONFIG_X86_LOCAL_APIC) && |
| vmcs_config.pin_based_exec_ctrl & PIN_BASED_POSTED_INTR; |
| } |
| |
| static inline bool cpu_has_vmx_apicv(void) |
| { |
| return cpu_has_vmx_apic_register_virt() && |
| cpu_has_vmx_virtual_intr_delivery() && |
| cpu_has_vmx_posted_intr(); |
| } |
| |
| static inline bool cpu_has_vmx_flexpriority(void) |
| { |
| return cpu_has_vmx_tpr_shadow() && |
| cpu_has_vmx_virtualize_apic_accesses(); |
| } |
| |
| static inline bool cpu_has_vmx_ept_execute_only(void) |
| { |
| return vmx_capability.ept & VMX_EPT_EXECUTE_ONLY_BIT; |
| } |
| |
| static inline bool cpu_has_vmx_ept_2m_page(void) |
| { |
| return vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT; |
| } |
| |
| static inline bool cpu_has_vmx_ept_1g_page(void) |
| { |
| return vmx_capability.ept & VMX_EPT_1GB_PAGE_BIT; |
| } |
| |
| static inline bool cpu_has_vmx_ept_4levels(void) |
| { |
| return vmx_capability.ept & VMX_EPT_PAGE_WALK_4_BIT; |
| } |
| |
| static inline bool cpu_has_vmx_ept_mt_wb(void) |
| { |
| return vmx_capability.ept & VMX_EPTP_WB_BIT; |
| } |
| |
| static inline bool cpu_has_vmx_ept_5levels(void) |
| { |
| return vmx_capability.ept & VMX_EPT_PAGE_WALK_5_BIT; |
| } |
| |
| static inline bool cpu_has_vmx_ept_ad_bits(void) |
| { |
| return vmx_capability.ept & VMX_EPT_AD_BIT; |
| } |
| |
| static inline bool cpu_has_vmx_invept_context(void) |
| { |
| return vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT; |
| } |
| |
| static inline bool cpu_has_vmx_invept_global(void) |
| { |
| return vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT; |
| } |
| |
| static inline bool cpu_has_vmx_invvpid_individual_addr(void) |
| { |
| return vmx_capability.vpid & VMX_VPID_EXTENT_INDIVIDUAL_ADDR_BIT; |
| } |
| |
| static inline bool cpu_has_vmx_invvpid_single(void) |
| { |
| return vmx_capability.vpid & VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT; |
| } |
| |
| static inline bool cpu_has_vmx_invvpid_global(void) |
| { |
| return vmx_capability.vpid & VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT; |
| } |
| |
| static inline bool cpu_has_vmx_invvpid(void) |
| { |
| return vmx_capability.vpid & VMX_VPID_INVVPID_BIT; |
| } |
| |
| static inline bool cpu_has_vmx_ept(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_ENABLE_EPT; |
| } |
| |
| static inline bool cpu_has_vmx_unrestricted_guest(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_UNRESTRICTED_GUEST; |
| } |
| |
| static inline bool cpu_has_vmx_ple(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_PAUSE_LOOP_EXITING; |
| } |
| |
| static inline bool cpu_has_vmx_basic_inout(void) |
| { |
| return (((u64)vmcs_config.basic_cap << 32) & VMX_BASIC_INOUT); |
| } |
| |
| static inline bool cpu_need_virtualize_apic_accesses(struct kvm_vcpu *vcpu) |
| { |
| return flexpriority_enabled && lapic_in_kernel(vcpu); |
| } |
| |
| static inline bool cpu_has_vmx_vpid(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_ENABLE_VPID; |
| } |
| |
| static inline bool cpu_has_vmx_rdtscp(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_RDTSCP; |
| } |
| |
| static inline bool cpu_has_vmx_invpcid(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_ENABLE_INVPCID; |
| } |
| |
| static inline bool cpu_has_virtual_nmis(void) |
| { |
| return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS; |
| } |
| |
| static inline bool cpu_has_vmx_wbinvd_exit(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_WBINVD_EXITING; |
| } |
| |
| static inline bool cpu_has_vmx_shadow_vmcs(void) |
| { |
| u64 vmx_msr; |
| rdmsrl(MSR_IA32_VMX_MISC, vmx_msr); |
| /* check if the cpu supports writing r/o exit information fields */ |
| if (!(vmx_msr & MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS)) |
| return false; |
| |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_SHADOW_VMCS; |
| } |
| |
| static inline bool cpu_has_vmx_pml(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_ENABLE_PML; |
| } |
| |
| static inline bool cpu_has_vmx_tsc_scaling(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_TSC_SCALING; |
| } |
| |
| static inline bool cpu_has_vmx_vmfunc(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_ENABLE_VMFUNC; |
| } |
| |
| static bool vmx_umip_emulated(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_DESC; |
| } |
| |
| static inline bool report_flexpriority(void) |
| { |
| return flexpriority_enabled; |
| } |
| |
| static inline unsigned nested_cpu_vmx_misc_cr3_count(struct kvm_vcpu *vcpu) |
| { |
| return vmx_misc_cr3_count(to_vmx(vcpu)->nested.msrs.misc_low); |
| } |
| |
| /* |
| * Do the virtual VMX capability MSRs specify that L1 can use VMWRITE |
| * to modify any valid field of the VMCS, or are the VM-exit |
| * information fields read-only? |
| */ |
| static inline bool nested_cpu_has_vmwrite_any_field(struct kvm_vcpu *vcpu) |
| { |
| return to_vmx(vcpu)->nested.msrs.misc_low & |
| MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS; |
| } |
| |
| static inline bool nested_cpu_has_zero_length_injection(struct kvm_vcpu *vcpu) |
| { |
| return to_vmx(vcpu)->nested.msrs.misc_low & VMX_MISC_ZERO_LEN_INS; |
| } |
| |
| static inline bool nested_cpu_supports_monitor_trap_flag(struct kvm_vcpu *vcpu) |
| { |
| return to_vmx(vcpu)->nested.msrs.procbased_ctls_high & |
| CPU_BASED_MONITOR_TRAP_FLAG; |
| } |
| |
| static inline bool nested_cpu_has_vmx_shadow_vmcs(struct kvm_vcpu *vcpu) |
| { |
| return to_vmx(vcpu)->nested.msrs.secondary_ctls_high & |
| SECONDARY_EXEC_SHADOW_VMCS; |
| } |
| |
| static inline bool nested_cpu_has(struct vmcs12 *vmcs12, u32 bit) |
| { |
| return vmcs12->cpu_based_vm_exec_control & bit; |
| } |
| |
| static inline bool nested_cpu_has2(struct vmcs12 *vmcs12, u32 bit) |
| { |
| return (vmcs12->cpu_based_vm_exec_control & |
| CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) && |
| (vmcs12->secondary_vm_exec_control & bit); |
| } |
| |
| static inline bool nested_cpu_has_preemption_timer(struct vmcs12 *vmcs12) |
| { |
| return vmcs12->pin_based_vm_exec_control & |
| PIN_BASED_VMX_PREEMPTION_TIMER; |
| } |
| |
| static inline bool nested_cpu_has_nmi_exiting(struct vmcs12 *vmcs12) |
| { |
| return vmcs12->pin_based_vm_exec_control & PIN_BASED_NMI_EXITING; |
| } |
| |
| static inline bool nested_cpu_has_virtual_nmis(struct vmcs12 *vmcs12) |
| { |
| return vmcs12->pin_based_vm_exec_control & PIN_BASED_VIRTUAL_NMIS; |
| } |
| |
| static inline int nested_cpu_has_ept(struct vmcs12 *vmcs12) |
| { |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_EPT); |
| } |
| |
| static inline bool nested_cpu_has_xsaves(struct vmcs12 *vmcs12) |
| { |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_XSAVES); |
| } |
| |
| static inline bool nested_cpu_has_pml(struct vmcs12 *vmcs12) |
| { |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_PML); |
| } |
| |
| static inline bool nested_cpu_has_virt_x2apic_mode(struct vmcs12 *vmcs12) |
| { |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE); |
| } |
| |
| static inline bool nested_cpu_has_vpid(struct vmcs12 *vmcs12) |
| { |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_VPID); |
| } |
| |
| static inline bool nested_cpu_has_apic_reg_virt(struct vmcs12 *vmcs12) |
| { |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_APIC_REGISTER_VIRT); |
| } |
| |
| static inline bool nested_cpu_has_vid(struct vmcs12 *vmcs12) |
| { |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY); |
| } |
| |
| static inline bool nested_cpu_has_posted_intr(struct vmcs12 *vmcs12) |
| { |
| return vmcs12->pin_based_vm_exec_control & PIN_BASED_POSTED_INTR; |
| } |
| |
| static inline bool nested_cpu_has_vmfunc(struct vmcs12 *vmcs12) |
| { |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_VMFUNC); |
| } |
| |
| static inline bool nested_cpu_has_eptp_switching(struct vmcs12 *vmcs12) |
| { |
| return nested_cpu_has_vmfunc(vmcs12) && |
| (vmcs12->vm_function_control & |
| VMX_VMFUNC_EPTP_SWITCHING); |
| } |
| |
| static inline bool nested_cpu_has_shadow_vmcs(struct vmcs12 *vmcs12) |
| { |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_SHADOW_VMCS); |
| } |
| |
| static inline bool is_nmi(u32 intr_info) |
| { |
| return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK)) |
| == (INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK); |
| } |
| |
| static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason, |
| u32 exit_intr_info, |
| unsigned long exit_qualification); |
| |
| static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr) |
| { |
| int i; |
| |
| for (i = 0; i < vmx->nmsrs; ++i) |
| if (vmx_msr_index[vmx->guest_msrs[i].index] == msr) |
| return i; |
| return -1; |
| } |
| |
| static inline void __invvpid(int ext, u16 vpid, gva_t gva) |
| { |
| struct { |
| u64 vpid : 16; |
| u64 rsvd : 48; |
| u64 gva; |
| } operand = { vpid, 0, gva }; |
| bool error; |
| |
| asm volatile (__ex(ASM_VMX_INVVPID) CC_SET(na) |
| : CC_OUT(na) (error) : "a"(&operand), "c"(ext) |
| : "memory"); |
| BUG_ON(error); |
| } |
| |
| static inline void __invept(int ext, u64 eptp, gpa_t gpa) |
| { |
| struct { |
| u64 eptp, gpa; |
| } operand = {eptp, gpa}; |
| bool error; |
| |
| asm volatile (__ex(ASM_VMX_INVEPT) CC_SET(na) |
| : CC_OUT(na) (error) : "a" (&operand), "c" (ext) |
| : "memory"); |
| BUG_ON(error); |
| } |
| |
| static struct shared_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr) |
| { |
| int i; |
| |
| i = __find_msr_index(vmx, msr); |
| if (i >= 0) |
| return &vmx->guest_msrs[i]; |
| return NULL; |
| } |
| |
| static void vmcs_clear(struct vmcs *vmcs) |
| { |
| u64 phys_addr = __pa(vmcs); |
| bool error; |
| |
| asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) CC_SET(na) |
| : CC_OUT(na) (error) : "a"(&phys_addr), "m"(phys_addr) |
| : "memory"); |
| if (unlikely(error)) |
| printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n", |
| vmcs, phys_addr); |
| } |
| |
| static inline void loaded_vmcs_init(struct loaded_vmcs *loaded_vmcs) |
| { |
| vmcs_clear(loaded_vmcs->vmcs); |
| if (loaded_vmcs->shadow_vmcs && loaded_vmcs->launched) |
| vmcs_clear(loaded_vmcs->shadow_vmcs); |
| loaded_vmcs->cpu = -1; |
| loaded_vmcs->launched = 0; |
| } |
| |
| static void vmcs_load(struct vmcs *vmcs) |
| { |
| u64 phys_addr = __pa(vmcs); |
| bool error; |
| |
| if (static_branch_unlikely(&enable_evmcs)) |
| return evmcs_load(phys_addr); |
| |
| asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) CC_SET(na) |
| : CC_OUT(na) (error) : "a"(&phys_addr), "m"(phys_addr) |
| : "memory"); |
| if (unlikely(error)) |
| printk(KERN_ERR "kvm: vmptrld %p/%llx failed\n", |
| vmcs, phys_addr); |
| } |
| |
| #ifdef CONFIG_KEXEC_CORE |
| /* |
| * This bitmap is used to indicate whether the vmclear |
| * operation is enabled on all cpus. All disabled by |
| * default. |
| */ |
| static cpumask_t crash_vmclear_enabled_bitmap = CPU_MASK_NONE; |
| |
| static inline void crash_enable_local_vmclear(int cpu) |
| { |
| cpumask_set_cpu(cpu, &crash_vmclear_enabled_bitmap); |
| } |
| |
| static inline void crash_disable_local_vmclear(int cpu) |
| { |
| cpumask_clear_cpu(cpu, &crash_vmclear_enabled_bitmap); |
| } |
| |
| static inline int crash_local_vmclear_enabled(int cpu) |
| { |
| return cpumask_test_cpu(cpu, &crash_vmclear_enabled_bitmap); |
| } |
| |
| static void crash_vmclear_local_loaded_vmcss(void) |
| { |
| int cpu = raw_smp_processor_id(); |
| struct loaded_vmcs *v; |
| |
| if (!crash_local_vmclear_enabled(cpu)) |
| return; |
| |
| list_for_each_entry(v, &per_cpu(loaded_vmcss_on_cpu, cpu), |
| loaded_vmcss_on_cpu_link) |
| vmcs_clear(v->vmcs); |
| } |
| #else |
| static inline void crash_enable_local_vmclear(int cpu) { } |
| static inline void crash_disable_local_vmclear(int cpu) { } |
| #endif /* CONFIG_KEXEC_CORE */ |
| |
| static void __loaded_vmcs_clear(void *arg) |
| { |
| struct loaded_vmcs *loaded_vmcs = arg; |
| int cpu = raw_smp_processor_id(); |
| |
| if (loaded_vmcs->cpu != cpu) |
| return; /* vcpu migration can race with cpu offline */ |
| if (per_cpu(current_vmcs, cpu) == loaded_vmcs->vmcs) |
| per_cpu(current_vmcs, cpu) = NULL; |
| crash_disable_local_vmclear(cpu); |
| list_del(&loaded_vmcs->loaded_vmcss_on_cpu_link); |
| |
| /* |
| * we should ensure updating loaded_vmcs->loaded_vmcss_on_cpu_link |
| * is before setting loaded_vmcs->vcpu to -1 which is done in |
| * loaded_vmcs_init. Otherwise, other cpu can see vcpu = -1 fist |
| * then adds the vmcs into percpu list before it is deleted. |
| */ |
| smp_wmb(); |
| |
| loaded_vmcs_init(loaded_vmcs); |
| crash_enable_local_vmclear(cpu); |
| } |
| |
| static void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs) |
| { |
| int cpu = loaded_vmcs->cpu; |
| |
| if (cpu != -1) |
| smp_call_function_single(cpu, |
| __loaded_vmcs_clear, loaded_vmcs, 1); |
| } |
| |
| static inline bool vpid_sync_vcpu_addr(int vpid, gva_t addr) |
| { |
| if (vpid == 0) |
| return true; |
| |
| if (cpu_has_vmx_invvpid_individual_addr()) { |
| __invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, vpid, addr); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static inline void vpid_sync_vcpu_single(int vpid) |
| { |
| if (vpid == 0) |
| return; |
| |
| if (cpu_has_vmx_invvpid_single()) |
| __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vpid, 0); |
| } |
| |
| static inline void vpid_sync_vcpu_global(void) |
| { |
| if (cpu_has_vmx_invvpid_global()) |
| __invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0); |
| } |
| |
| static inline void vpid_sync_context(int vpid) |
| { |
| if (cpu_has_vmx_invvpid_single()) |
| vpid_sync_vcpu_single(vpid); |
| else |
| vpid_sync_vcpu_global(); |
| } |
| |
| static inline void ept_sync_global(void) |
| { |
| __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0); |
| } |
| |
| static inline void ept_sync_context(u64 eptp) |
| { |
| if (cpu_has_vmx_invept_context()) |
| __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0); |
| else |
| ept_sync_global(); |
| } |
| |
| static __always_inline void vmcs_check16(unsigned long field) |
| { |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000, |
| "16-bit accessor invalid for 64-bit field"); |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001, |
| "16-bit accessor invalid for 64-bit high field"); |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000, |
| "16-bit accessor invalid for 32-bit high field"); |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000, |
| "16-bit accessor invalid for natural width field"); |
| } |
| |
| static __always_inline void vmcs_check32(unsigned long field) |
| { |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0, |
| "32-bit accessor invalid for 16-bit field"); |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000, |
| "32-bit accessor invalid for natural width field"); |
| } |
| |
| static __always_inline void vmcs_check64(unsigned long field) |
| { |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0, |
| "64-bit accessor invalid for 16-bit field"); |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001, |
| "64-bit accessor invalid for 64-bit high field"); |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000, |
| "64-bit accessor invalid for 32-bit field"); |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000, |
| "64-bit accessor invalid for natural width field"); |
| } |
| |
| static __always_inline void vmcs_checkl(unsigned long field) |
| { |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0, |
| "Natural width accessor invalid for 16-bit field"); |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000, |
| "Natural width accessor invalid for 64-bit field"); |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001, |
| "Natural width accessor invalid for 64-bit high field"); |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000, |
| "Natural width accessor invalid for 32-bit field"); |
| } |
| |
| static __always_inline unsigned long __vmcs_readl(unsigned long field) |
| { |
| unsigned long value; |
| |
| asm volatile (__ex_clear(ASM_VMX_VMREAD_RDX_RAX, "%0") |
| : "=a"(value) : "d"(field) : "cc"); |
| return value; |
| } |
| |
| static __always_inline u16 vmcs_read16(unsigned long field) |
| { |
| vmcs_check16(field); |
| if (static_branch_unlikely(&enable_evmcs)) |
| return evmcs_read16(field); |
| return __vmcs_readl(field); |
| } |
| |
| static __always_inline u32 vmcs_read32(unsigned long field) |
| { |
| vmcs_check32(field); |
| if (static_branch_unlikely(&enable_evmcs)) |
| return evmcs_read32(field); |
| return __vmcs_readl(field); |
| } |
| |
| static __always_inline u64 vmcs_read64(unsigned long field) |
| { |
| vmcs_check64(field); |
| if (static_branch_unlikely(&enable_evmcs)) |
| return evmcs_read64(field); |
| #ifdef CONFIG_X86_64 |
| return __vmcs_readl(field); |
| #else |
| return __vmcs_readl(field) | ((u64)__vmcs_readl(field+1) << 32); |
| #endif |
| } |
| |
| static __always_inline unsigned long vmcs_readl(unsigned long field) |
| { |
| vmcs_checkl(field); |
| if (static_branch_unlikely(&enable_evmcs)) |
| return evmcs_read64(field); |
| return __vmcs_readl(field); |
| } |
| |
| static noinline void vmwrite_error(unsigned long field, unsigned long value) |
| { |
| printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n", |
| field, value, vmcs_read32(VM_INSTRUCTION_ERROR)); |
| dump_stack(); |
| } |
| |
| static __always_inline void __vmcs_writel(unsigned long field, unsigned long value) |
| { |
| bool error; |
| |
| asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) CC_SET(na) |
| : CC_OUT(na) (error) : "a"(value), "d"(field)); |
| if (unlikely(error)) |
| vmwrite_error(field, value); |
| } |
| |
| static __always_inline void vmcs_write16(unsigned long field, u16 value) |
| { |
| vmcs_check16(field); |
| if (static_branch_unlikely(&enable_evmcs)) |
| return evmcs_write16(field, value); |
| |
| __vmcs_writel(field, value); |
| } |
| |
| static __always_inline void vmcs_write32(unsigned long field, u32 value) |
| { |
| vmcs_check32(field); |
| if (static_branch_unlikely(&enable_evmcs)) |
| return evmcs_write32(field, value); |
| |
| __vmcs_writel(field, value); |
| } |
| |
| static __always_inline void vmcs_write64(unsigned long field, u64 value) |
| { |
| vmcs_check64(field); |
| if (static_branch_unlikely(&enable_evmcs)) |
| return evmcs_write64(field, value); |
| |
| __vmcs_writel(field, value); |
| #ifndef CONFIG_X86_64 |
| asm volatile (""); |
| __vmcs_writel(field+1, value >> 32); |
| #endif |
| } |
| |
| static __always_inline void vmcs_writel(unsigned long field, unsigned long value) |
| { |
| vmcs_checkl(field); |
| if (static_branch_unlikely(&enable_evmcs)) |
| return evmcs_write64(field, value); |
| |
| __vmcs_writel(field, value); |
| } |
| |
| static __always_inline void vmcs_clear_bits(unsigned long field, u32 mask) |
| { |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000, |
| "vmcs_clear_bits does not support 64-bit fields"); |
| if (static_branch_unlikely(&enable_evmcs)) |
| return evmcs_write32(field, evmcs_read32(field) & ~mask); |
| |
| __vmcs_writel(field, __vmcs_readl(field) & ~mask); |
| } |
| |
| static __always_inline void vmcs_set_bits(unsigned long field, u32 mask) |
| { |
| BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000, |
| "vmcs_set_bits does not support 64-bit fields"); |
| if (static_branch_unlikely(&enable_evmcs)) |
| return evmcs_write32(field, evmcs_read32(field) | mask); |
| |
| __vmcs_writel(field, __vmcs_readl(field) | mask); |
| } |
| |
| static inline void vm_entry_controls_reset_shadow(struct vcpu_vmx *vmx) |
| { |
| vmx->vm_entry_controls_shadow = vmcs_read32(VM_ENTRY_CONTROLS); |
| } |
| |
| static inline void vm_entry_controls_init(struct vcpu_vmx *vmx, u32 val) |
| { |
| vmcs_write32(VM_ENTRY_CONTROLS, val); |
| vmx->vm_entry_controls_shadow = val; |
| } |
| |
| static inline void vm_entry_controls_set(struct vcpu_vmx *vmx, u32 val) |
| { |
| if (vmx->vm_entry_controls_shadow != val) |
| vm_entry_controls_init(vmx, val); |
| } |
| |
| static inline u32 vm_entry_controls_get(struct vcpu_vmx *vmx) |
| { |
| return vmx->vm_entry_controls_shadow; |
| } |
| |
| |
| static inline void vm_entry_controls_setbit(struct vcpu_vmx *vmx, u32 val) |
| { |
| vm_entry_controls_set(vmx, vm_entry_controls_get(vmx) | val); |
| } |
| |
| static inline void vm_entry_controls_clearbit(struct vcpu_vmx *vmx, u32 val) |
| { |
| vm_entry_controls_set(vmx, vm_entry_controls_get(vmx) & ~val); |
| } |
| |
| static inline void vm_exit_controls_reset_shadow(struct vcpu_vmx *vmx) |
| { |
| vmx->vm_exit_controls_shadow = vmcs_read32(VM_EXIT_CONTROLS); |
| } |
| |
| static inline void vm_exit_controls_init(struct vcpu_vmx *vmx, u32 val) |
| { |
| vmcs_write32(VM_EXIT_CONTROLS, val); |
| vmx->vm_exit_controls_shadow = val; |
| } |
| |
| static inline void vm_exit_controls_set(struct vcpu_vmx *vmx, u32 val) |
| { |
| if (vmx->vm_exit_controls_shadow != val) |
| vm_exit_controls_init(vmx, val); |
| } |
| |
| static inline u32 vm_exit_controls_get(struct vcpu_vmx *vmx) |
| { |
| return vmx->vm_exit_controls_shadow; |
| } |
| |
| |
| static inline void vm_exit_controls_setbit(struct vcpu_vmx *vmx, u32 val) |
| { |
| vm_exit_controls_set(vmx, vm_exit_controls_get(vmx) | val); |
| } |
| |
| static inline void vm_exit_controls_clearbit(struct vcpu_vmx *vmx, u32 val) |
| { |
| vm_exit_controls_set(vmx, vm_exit_controls_get(vmx) & ~val); |
| } |
| |
| static void vmx_segment_cache_clear(struct vcpu_vmx *vmx) |
| { |
| vmx->segment_cache.bitmask = 0; |
| } |
| |
| static bool vmx_segment_cache_test_set(struct vcpu_vmx *vmx, unsigned seg, |
| unsigned field) |
| { |
| bool ret; |
| u32 mask = 1 << (seg * SEG_FIELD_NR + field); |
| |
| if (!(vmx->vcpu.arch.regs_avail & (1 << VCPU_EXREG_SEGMENTS))) { |
| vmx->vcpu.arch.regs_avail |= (1 << VCPU_EXREG_SEGMENTS); |
| vmx->segment_cache.bitmask = 0; |
| } |
| ret = vmx->segment_cache.bitmask & mask; |
| vmx->segment_cache.bitmask |= mask; |
| return ret; |
| } |
| |
| static u16 vmx_read_guest_seg_selector(struct vcpu_vmx *vmx, unsigned seg) |
| { |
| u16 *p = &vmx->segment_cache.seg[seg].selector; |
| |
| if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_SEL)) |
| *p = vmcs_read16(kvm_vmx_segment_fields[seg].selector); |
| return *p; |
| } |
| |
| static ulong vmx_read_guest_seg_base(struct vcpu_vmx *vmx, unsigned seg) |
| { |
| ulong *p = &vmx->segment_cache.seg[seg].base; |
| |
| if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_BASE)) |
| *p = vmcs_readl(kvm_vmx_segment_fields[seg].base); |
| return *p; |
| } |
| |
| static u32 vmx_read_guest_seg_limit(struct vcpu_vmx *vmx, unsigned seg) |
| { |
| u32 *p = &vmx->segment_cache.seg[seg].limit; |
| |
| if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_LIMIT)) |
| *p = vmcs_read32(kvm_vmx_segment_fields[seg].limit); |
| return *p; |
| } |
| |
| static u32 vmx_read_guest_seg_ar(struct vcpu_vmx *vmx, unsigned seg) |
| { |
| u32 *p = &vmx->segment_cache.seg[seg].ar; |
| |
| if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_AR)) |
| *p = vmcs_read32(kvm_vmx_segment_fields[seg].ar_bytes); |
| return *p; |
| } |
| |
| static void update_exception_bitmap(struct kvm_vcpu *vcpu) |
| { |
| u32 eb; |
| |
| eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR) | |
| (1u << DB_VECTOR) | (1u << AC_VECTOR); |
| /* |
| * Guest access to VMware backdoor ports could legitimately |
| * trigger #GP because of TSS I/O permission bitmap. |
| * We intercept those #GP and allow access to them anyway |
| * as VMware does. |
| */ |
| if (enable_vmware_backdoor) |
| eb |= (1u << GP_VECTOR); |
| if ((vcpu->guest_debug & |
| (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) == |
| (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) |
| eb |= 1u << BP_VECTOR; |
| if (to_vmx(vcpu)->rmode.vm86_active) |
| eb = ~0; |
| if (enable_ept) |
| eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */ |
| |
| /* When we are running a nested L2 guest and L1 specified for it a |
| * certain exception bitmap, we must trap the same exceptions and pass |
| * them to L1. When running L2, we will only handle the exceptions |
| * specified above if L1 did not want them. |
| */ |
| if (is_guest_mode(vcpu)) |
| eb |= get_vmcs12(vcpu)->exception_bitmap; |
| |
| vmcs_write32(EXCEPTION_BITMAP, eb); |
| } |
| |
| /* |
| * Check if MSR is intercepted for currently loaded MSR bitmap. |
| */ |
| static bool msr_write_intercepted(struct kvm_vcpu *vcpu, u32 msr) |
| { |
| unsigned long *msr_bitmap; |
| int f = sizeof(unsigned long); |
| |
| if (!cpu_has_vmx_msr_bitmap()) |
| return true; |
| |
| msr_bitmap = to_vmx(vcpu)->loaded_vmcs->msr_bitmap; |
| |
| if (msr <= 0x1fff) { |
| return !!test_bit(msr, msr_bitmap + 0x800 / f); |
| } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { |
| msr &= 0x1fff; |
| return !!test_bit(msr, msr_bitmap + 0xc00 / f); |
| } |
| |
| return true; |
| } |
| |
| /* |
| * Check if MSR is intercepted for L01 MSR bitmap. |
| */ |
| static bool msr_write_intercepted_l01(struct kvm_vcpu *vcpu, u32 msr) |
| { |
| unsigned long *msr_bitmap; |
| int f = sizeof(unsigned long); |
| |
| if (!cpu_has_vmx_msr_bitmap()) |
| return true; |
| |
| msr_bitmap = to_vmx(vcpu)->vmcs01.msr_bitmap; |
| |
| if (msr <= 0x1fff) { |
| return !!test_bit(msr, msr_bitmap + 0x800 / f); |
| } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { |
| msr &= 0x1fff; |
| return !!test_bit(msr, msr_bitmap + 0xc00 / f); |
| } |
| |
| return true; |
| } |
| |
| static void clear_atomic_switch_msr_special(struct vcpu_vmx *vmx, |
| unsigned long entry, unsigned long exit) |
| { |
| vm_entry_controls_clearbit(vmx, entry); |
| vm_exit_controls_clearbit(vmx, exit); |
| } |
| |
| static int find_msr(struct vmx_msrs *m, unsigned int msr) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < m->nr; ++i) { |
| if (m->val[i].index == msr) |
| return i; |
| } |
| return -ENOENT; |
| } |
| |
| static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr) |
| { |
| int i; |
| struct msr_autoload *m = &vmx->msr_autoload; |
| |
| switch (msr) { |
| case MSR_EFER: |
| if (cpu_has_load_ia32_efer) { |
| clear_atomic_switch_msr_special(vmx, |
| VM_ENTRY_LOAD_IA32_EFER, |
| VM_EXIT_LOAD_IA32_EFER); |
| return; |
| } |
| break; |
| case MSR_CORE_PERF_GLOBAL_CTRL: |
| if (cpu_has_load_perf_global_ctrl) { |
| clear_atomic_switch_msr_special(vmx, |
| VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL, |
| VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL); |
| return; |
| } |
| break; |
| } |
| i = find_msr(&m->guest, msr); |
| if (i < 0) |
| goto skip_guest; |
| --m->guest.nr; |
| m->guest.val[i] = m->guest.val[m->guest.nr]; |
| vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->guest.nr); |
| |
| skip_guest: |
| i = find_msr(&m->host, msr); |
| if (i < 0) |
| return; |
| |
| --m->host.nr; |
| m->host.val[i] = m->host.val[m->host.nr]; |
| vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->host.nr); |
| } |
| |
| static void add_atomic_switch_msr_special(struct vcpu_vmx *vmx, |
| unsigned long entry, unsigned long exit, |
| unsigned long guest_val_vmcs, unsigned long host_val_vmcs, |
| u64 guest_val, u64 host_val) |
| { |
| vmcs_write64(guest_val_vmcs, guest_val); |
| if (host_val_vmcs != HOST_IA32_EFER) |
| vmcs_write64(host_val_vmcs, host_val); |
| vm_entry_controls_setbit(vmx, entry); |
| vm_exit_controls_setbit(vmx, exit); |
| } |
| |
| static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr, |
| u64 guest_val, u64 host_val, bool entry_only) |
| { |
| int i, j = 0; |
| struct msr_autoload *m = &vmx->msr_autoload; |
| |
| switch (msr) { |
| case MSR_EFER: |
| if (cpu_has_load_ia32_efer) { |
| add_atomic_switch_msr_special(vmx, |
| VM_ENTRY_LOAD_IA32_EFER, |
| VM_EXIT_LOAD_IA32_EFER, |
| GUEST_IA32_EFER, |
| HOST_IA32_EFER, |
| guest_val, host_val); |
| return; |
| } |
| break; |
| case MSR_CORE_PERF_GLOBAL_CTRL: |
| if (cpu_has_load_perf_global_ctrl) { |
| add_atomic_switch_msr_special(vmx, |
| VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL, |
| VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL, |
| GUEST_IA32_PERF_GLOBAL_CTRL, |
| HOST_IA32_PERF_GLOBAL_CTRL, |
| guest_val, host_val); |
| return; |
| } |
| break; |
| case MSR_IA32_PEBS_ENABLE: |
| /* PEBS needs a quiescent period after being disabled (to write |
| * a record). Disabling PEBS through VMX MSR swapping doesn't |
| * provide that period, so a CPU could write host's record into |
| * guest's memory. |
| */ |
| wrmsrl(MSR_IA32_PEBS_ENABLE, 0); |
| } |
| |
| i = find_msr(&m->guest, msr); |
| if (!entry_only) |
| j = find_msr(&m->host, msr); |
| |
| if (i == NR_AUTOLOAD_MSRS || j == NR_AUTOLOAD_MSRS) { |
| printk_once(KERN_WARNING "Not enough msr switch entries. " |
| "Can't add msr %x\n", msr); |
| return; |
| } |
| if (i < 0) { |
| i = m->guest.nr++; |
| vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->guest.nr); |
| } |
| m->guest.val[i].index = msr; |
| m->guest.val[i].value = guest_val; |
| |
| if (entry_only) |
| return; |
| |
| if (j < 0) { |
| j = m->host.nr++; |
| vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->host.nr); |
| } |
| m->host.val[j].index = msr; |
| m->host.val[j].value = host_val; |
| } |
| |
| static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset) |
| { |
| u64 guest_efer = vmx->vcpu.arch.efer; |
| u64 ignore_bits = 0; |
| |
| if (!enable_ept) { |
| /* |
| * NX is needed to handle CR0.WP=1, CR4.SMEP=1. Testing |
| * host CPUID is more efficient than testing guest CPUID |
| * or CR4. Host SMEP is anyway a requirement for guest SMEP. |
| */ |
| if (boot_cpu_has(X86_FEATURE_SMEP)) |
| guest_efer |= EFER_NX; |
| else if (!(guest_efer & EFER_NX)) |
| ignore_bits |= EFER_NX; |
| } |
| |
| /* |
| * LMA and LME handled by hardware; SCE meaningless outside long mode. |
| */ |
| ignore_bits |= EFER_SCE; |
| #ifdef CONFIG_X86_64 |
| ignore_bits |= EFER_LMA | EFER_LME; |
| /* SCE is meaningful only in long mode on Intel */ |
| if (guest_efer & EFER_LMA) |
| ignore_bits &= ~(u64)EFER_SCE; |
| #endif |
| |
| /* |
| * On EPT, we can't emulate NX, so we must switch EFER atomically. |
| * On CPUs that support "load IA32_EFER", always switch EFER |
| * atomically, since it's faster than switching it manually. |
| */ |
| if (cpu_has_load_ia32_efer || |
| (enable_ept && ((vmx->vcpu.arch.efer ^ host_efer) & EFER_NX))) { |
| if (!(guest_efer & EFER_LMA)) |
| guest_efer &= ~EFER_LME; |
| if (guest_efer != host_efer) |
| add_atomic_switch_msr(vmx, MSR_EFER, |
| guest_efer, host_efer, false); |
| else |
| clear_atomic_switch_msr(vmx, MSR_EFER); |
| return false; |
| } else { |
| clear_atomic_switch_msr(vmx, MSR_EFER); |
| |
| guest_efer &= ~ignore_bits; |
| guest_efer |= host_efer & ignore_bits; |
| |
| vmx->guest_msrs[efer_offset].data = guest_efer; |
| vmx->guest_msrs[efer_offset].mask = ~ignore_bits; |
| |
| return true; |
| } |
| } |
| |
| #ifdef CONFIG_X86_32 |
| /* |
| * On 32-bit kernels, VM exits still load the FS and GS bases from the |
| * VMCS rather than the segment table. KVM uses this helper to figure |
| * out the current bases to poke them into the VMCS before entry. |
| */ |
| static unsigned long segment_base(u16 selector) |
| { |
| struct desc_struct *table; |
| unsigned long v; |
| |
| if (!(selector & ~SEGMENT_RPL_MASK)) |
| return 0; |
| |
| table = get_current_gdt_ro(); |
| |
| if ((selector & SEGMENT_TI_MASK) == SEGMENT_LDT) { |
| u16 ldt_selector = kvm_read_ldt(); |
| |
| if (!(ldt_selector & ~SEGMENT_RPL_MASK)) |
| return 0; |
| |
| table = (struct desc_struct *)segment_base(ldt_selector); |
| } |
| v = get_desc_base(&table[selector >> 3]); |
| return v; |
| } |
| #endif |
| |
| static void vmx_prepare_switch_to_guest(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct vmcs_host_state *host_state; |
| #ifdef CONFIG_X86_64 |
| int cpu = raw_smp_processor_id(); |
| #endif |
| unsigned long fs_base, gs_base; |
| u16 fs_sel, gs_sel; |
| int i; |
| |
| vmx->req_immediate_exit = false; |
| |
| if (vmx->loaded_cpu_state) |
| return; |
| |
| vmx->loaded_cpu_state = vmx->loaded_vmcs; |
| host_state = &vmx->loaded_cpu_state->host_state; |
| |
| /* |
| * Set host fs and gs selectors. Unfortunately, 22.2.3 does not |
| * allow segment selectors with cpl > 0 or ti == 1. |
| */ |
| host_state->ldt_sel = kvm_read_ldt(); |
| |
| #ifdef CONFIG_X86_64 |
| savesegment(ds, host_state->ds_sel); |
| savesegment(es, host_state->es_sel); |
| |
| gs_base = cpu_kernelmode_gs_base(cpu); |
| if (likely(is_64bit_mm(current->mm))) { |
| save_fsgs_for_kvm(); |
| fs_sel = current->thread.fsindex; |
| gs_sel = current->thread.gsindex; |
| fs_base = current->thread.fsbase; |
| vmx->msr_host_kernel_gs_base = current->thread.gsbase; |
| } else { |
| savesegment(fs, fs_sel); |
| savesegment(gs, gs_sel); |
| fs_base = read_msr(MSR_FS_BASE); |
| vmx->msr_host_kernel_gs_base = read_msr(MSR_KERNEL_GS_BASE); |
| } |
| |
| wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); |
| #else |
| savesegment(fs, fs_sel); |
| savesegment(gs, gs_sel); |
| fs_base = segment_base(fs_sel); |
| gs_base = segment_base(gs_sel); |
| #endif |
| |
| if (unlikely(fs_sel != host_state->fs_sel)) { |
| if (!(fs_sel & 7)) |
| vmcs_write16(HOST_FS_SELECTOR, fs_sel); |
| else |
| vmcs_write16(HOST_FS_SELECTOR, 0); |
| host_state->fs_sel = fs_sel; |
| } |
| if (unlikely(gs_sel != host_state->gs_sel)) { |
| if (!(gs_sel & 7)) |
| vmcs_write16(HOST_GS_SELECTOR, gs_sel); |
| else |
| vmcs_write16(HOST_GS_SELECTOR, 0); |
| host_state->gs_sel = gs_sel; |
| } |
| if (unlikely(fs_base != host_state->fs_base)) { |
| vmcs_writel(HOST_FS_BASE, fs_base); |
| host_state->fs_base = fs_base; |
| } |
| if (unlikely(gs_base != host_state->gs_base)) { |
| vmcs_writel(HOST_GS_BASE, gs_base); |
| host_state->gs_base = gs_base; |
| } |
| |
| for (i = 0; i < vmx->save_nmsrs; ++i) |
| kvm_set_shared_msr(vmx->guest_msrs[i].index, |
| vmx->guest_msrs[i].data, |
| vmx->guest_msrs[i].mask); |
| } |
| |
| static void vmx_prepare_switch_to_host(struct vcpu_vmx *vmx) |
| { |
| struct vmcs_host_state *host_state; |
| |
| if (!vmx->loaded_cpu_state) |
| return; |
| |
| WARN_ON_ONCE(vmx->loaded_cpu_state != vmx->loaded_vmcs); |
| host_state = &vmx->loaded_cpu_state->host_state; |
| |
| ++vmx->vcpu.stat.host_state_reload; |
| vmx->loaded_cpu_state = NULL; |
| |
| #ifdef CONFIG_X86_64 |
| rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); |
| #endif |
| if (host_state->ldt_sel || (host_state->gs_sel & 7)) { |
| kvm_load_ldt(host_state->ldt_sel); |
| #ifdef CONFIG_X86_64 |
| load_gs_index(host_state->gs_sel); |
| #else |
| loadsegment(gs, host_state->gs_sel); |
| #endif |
| } |
| if (host_state->fs_sel & 7) |
| loadsegment(fs, host_state->fs_sel); |
| #ifdef CONFIG_X86_64 |
| if (unlikely(host_state->ds_sel | host_state->es_sel)) { |
| loadsegment(ds, host_state->ds_sel); |
| loadsegment(es, host_state->es_sel); |
| } |
| #endif |
| invalidate_tss_limit(); |
| #ifdef CONFIG_X86_64 |
| wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base); |
| #endif |
| load_fixmap_gdt(raw_smp_processor_id()); |
| } |
| |
| #ifdef CONFIG_X86_64 |
| static u64 vmx_read_guest_kernel_gs_base(struct vcpu_vmx *vmx) |
| { |
| preempt_disable(); |
| if (vmx->loaded_cpu_state) |
| rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); |
| preempt_enable(); |
| return vmx->msr_guest_kernel_gs_base; |
| } |
| |
| static void vmx_write_guest_kernel_gs_base(struct vcpu_vmx *vmx, u64 data) |
| { |
| preempt_disable(); |
| if (vmx->loaded_cpu_state) |
| wrmsrl(MSR_KERNEL_GS_BASE, data); |
| preempt_enable(); |
| vmx->msr_guest_kernel_gs_base = data; |
| } |
| #endif |
| |
| static void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu) |
| { |
| struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); |
| struct pi_desc old, new; |
| unsigned int dest; |
| |
| /* |
| * In case of hot-plug or hot-unplug, we may have to undo |
| * vmx_vcpu_pi_put even if there is no assigned device. And we |
| * always keep PI.NDST up to date for simplicity: it makes the |
| * code easier, and CPU migration is not a fast path. |
| */ |
| if (!pi_test_sn(pi_desc) && vcpu->cpu == cpu) |
| return; |
| |
| /* |
| * First handle the simple case where no cmpxchg is necessary; just |
| * allow posting non-urgent interrupts. |
| * |
| * If the 'nv' field is POSTED_INTR_WAKEUP_VECTOR, do not change |
| * PI.NDST: pi_post_block will do it for us and the wakeup_handler |
| * expects the VCPU to be on the blocked_vcpu_list that matches |
| * PI.NDST. |
| */ |
| if (pi_desc->nv == POSTED_INTR_WAKEUP_VECTOR || |
| vcpu->cpu == cpu) { |
| pi_clear_sn(pi_desc); |
| return; |
| } |
| |
| /* The full case. */ |
| do { |
| old.control = new.control = pi_desc->control; |
| |
| dest = cpu_physical_id(cpu); |
| |
| if (x2apic_enabled()) |
| new.ndst = dest; |
| else |
| new.ndst = (dest << 8) & 0xFF00; |
| |
| new.sn = 0; |
| } while (cmpxchg64(&pi_desc->control, old.control, |
| new.control) != old.control); |
| } |
| |
| static void decache_tsc_multiplier(struct vcpu_vmx *vmx) |
| { |
| vmx->current_tsc_ratio = vmx->vcpu.arch.tsc_scaling_ratio; |
| vmcs_write64(TSC_MULTIPLIER, vmx->current_tsc_ratio); |
| } |
| |
| /* |
| * Switches to specified vcpu, until a matching vcpu_put(), but assumes |
| * vcpu mutex is already taken. |
| */ |
| static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| bool already_loaded = vmx->loaded_vmcs->cpu == cpu; |
| |
| if (!already_loaded) { |
| loaded_vmcs_clear(vmx->loaded_vmcs); |
| local_irq_disable(); |
| crash_disable_local_vmclear(cpu); |
| |
| /* |
| * Read loaded_vmcs->cpu should be before fetching |
| * loaded_vmcs->loaded_vmcss_on_cpu_link. |
| * See the comments in __loaded_vmcs_clear(). |
| */ |
| smp_rmb(); |
| |
| list_add(&vmx->loaded_vmcs->loaded_vmcss_on_cpu_link, |
| &per_cpu(loaded_vmcss_on_cpu, cpu)); |
| crash_enable_local_vmclear(cpu); |
| local_irq_enable(); |
| } |
| |
| if (per_cpu(current_vmcs, cpu) != vmx->loaded_vmcs->vmcs) { |
| per_cpu(current_vmcs, cpu) = vmx->loaded_vmcs->vmcs; |
| vmcs_load(vmx->loaded_vmcs->vmcs); |
| indirect_branch_prediction_barrier(); |
| } |
| |
| if (!already_loaded) { |
| void *gdt = get_current_gdt_ro(); |
| unsigned long sysenter_esp; |
| |
| kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
| |
| /* |
| * Linux uses per-cpu TSS and GDT, so set these when switching |
| * processors. See 22.2.4. |
| */ |
| vmcs_writel(HOST_TR_BASE, |
| (unsigned long)&get_cpu_entry_area(cpu)->tss.x86_tss); |
| vmcs_writel(HOST_GDTR_BASE, (unsigned long)gdt); /* 22.2.4 */ |
| |
| /* |
| * VM exits change the host TR limit to 0x67 after a VM |
| * exit. This is okay, since 0x67 covers everything except |
| * the IO bitmap and have have code to handle the IO bitmap |
| * being lost after a VM exit. |
| */ |
| BUILD_BUG_ON(IO_BITMAP_OFFSET - 1 != 0x67); |
| |
| rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp); |
| vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */ |
| |
| vmx->loaded_vmcs->cpu = cpu; |
| } |
| |
| /* Setup TSC multiplier */ |
| if (kvm_has_tsc_control && |
| vmx->current_tsc_ratio != vcpu->arch.tsc_scaling_ratio) |
| decache_tsc_multiplier(vmx); |
| |
| vmx_vcpu_pi_load(vcpu, cpu); |
| vmx->host_pkru = read_pkru(); |
| vmx->host_debugctlmsr = get_debugctlmsr(); |
| } |
| |
| static void vmx_vcpu_pi_put(struct kvm_vcpu *vcpu) |
| { |
| struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); |
| |
| if (!kvm_arch_has_assigned_device(vcpu->kvm) || |
| !irq_remapping_cap(IRQ_POSTING_CAP) || |
| !kvm_vcpu_apicv_active(vcpu)) |
| return; |
| |
| /* Set SN when the vCPU is preempted */ |
| if (vcpu->preempted) |
| pi_set_sn(pi_desc); |
| } |
| |
| static void vmx_vcpu_put(struct kvm_vcpu *vcpu) |
| { |
| vmx_vcpu_pi_put(vcpu); |
| |
| vmx_prepare_switch_to_host(to_vmx(vcpu)); |
| } |
| |
| static bool emulation_required(struct kvm_vcpu *vcpu) |
| { |
| return emulate_invalid_guest_state && !guest_state_valid(vcpu); |
| } |
| |
| static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu); |
| |
| /* |
| * Return the cr0 value that a nested guest would read. This is a combination |
| * of the real cr0 used to run the guest (guest_cr0), and the bits shadowed by |
| * its hypervisor (cr0_read_shadow). |
| */ |
| static inline unsigned long nested_read_cr0(struct vmcs12 *fields) |
| { |
| return (fields->guest_cr0 & ~fields->cr0_guest_host_mask) | |
| (fields->cr0_read_shadow & fields->cr0_guest_host_mask); |
| } |
| static inline unsigned long nested_read_cr4(struct vmcs12 *fields) |
| { |
| return (fields->guest_cr4 & ~fields->cr4_guest_host_mask) | |
| (fields->cr4_read_shadow & fields->cr4_guest_host_mask); |
| } |
| |
| static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu) |
| { |
| unsigned long rflags, save_rflags; |
| |
| if (!test_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail)) { |
| __set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail); |
| rflags = vmcs_readl(GUEST_RFLAGS); |
| if (to_vmx(vcpu)->rmode.vm86_active) { |
| rflags &= RMODE_GUEST_OWNED_EFLAGS_BITS; |
| save_rflags = to_vmx(vcpu)->rmode.save_rflags; |
| rflags |= save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS; |
| } |
| to_vmx(vcpu)->rflags = rflags; |
| } |
| return to_vmx(vcpu)->rflags; |
| } |
| |
| static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) |
| { |
| unsigned long old_rflags = vmx_get_rflags(vcpu); |
| |
| __set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail); |
| to_vmx(vcpu)->rflags = rflags; |
| if (to_vmx(vcpu)->rmode.vm86_active) { |
| to_vmx(vcpu)->rmode.save_rflags = rflags; |
| rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM; |
| } |
| vmcs_writel(GUEST_RFLAGS, rflags); |
| |
| if ((old_rflags ^ to_vmx(vcpu)->rflags) & X86_EFLAGS_VM) |
| to_vmx(vcpu)->emulation_required = emulation_required(vcpu); |
| } |
| |
| static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu) |
| { |
| u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); |
| int ret = 0; |
| |
| if (interruptibility & GUEST_INTR_STATE_STI) |
| ret |= KVM_X86_SHADOW_INT_STI; |
| if (interruptibility & GUEST_INTR_STATE_MOV_SS) |
| ret |= KVM_X86_SHADOW_INT_MOV_SS; |
| |
| return ret; |
| } |
| |
| static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask) |
| { |
| u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); |
| u32 interruptibility = interruptibility_old; |
| |
| interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS); |
| |
| if (mask & KVM_X86_SHADOW_INT_MOV_SS) |
| interruptibility |= GUEST_INTR_STATE_MOV_SS; |
| else if (mask & KVM_X86_SHADOW_INT_STI) |
| interruptibility |= GUEST_INTR_STATE_STI; |
| |
| if ((interruptibility != interruptibility_old)) |
| vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility); |
| } |
| |
| static void skip_emulated_instruction(struct kvm_vcpu *vcpu) |
| { |
| unsigned long rip; |
| |
| rip = kvm_rip_read(vcpu); |
| rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN); |
| kvm_rip_write(vcpu, rip); |
| |
| /* skipping an emulated instruction also counts */ |
| vmx_set_interrupt_shadow(vcpu, 0); |
| } |
| |
| static void nested_vmx_inject_exception_vmexit(struct kvm_vcpu *vcpu, |
| unsigned long exit_qual) |
| { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| unsigned int nr = vcpu->arch.exception.nr; |
| u32 intr_info = nr | INTR_INFO_VALID_MASK; |
| |
| if (vcpu->arch.exception.has_error_code) { |
| vmcs12->vm_exit_intr_error_code = vcpu->arch.exception.error_code; |
| intr_info |= INTR_INFO_DELIVER_CODE_MASK; |
| } |
| |
| if (kvm_exception_is_soft(nr)) |
| intr_info |= INTR_TYPE_SOFT_EXCEPTION; |
| else |
| intr_info |= INTR_TYPE_HARD_EXCEPTION; |
| |
| if (!(vmcs12->idt_vectoring_info_field & VECTORING_INFO_VALID_MASK) && |
| vmx_get_nmi_mask(vcpu)) |
| intr_info |= INTR_INFO_UNBLOCK_NMI; |
| |
| nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI, intr_info, exit_qual); |
| } |
| |
| /* |
| * KVM wants to inject page-faults which it got to the guest. This function |
| * checks whether in a nested guest, we need to inject them to L1 or L2. |
| */ |
| static int nested_vmx_check_exception(struct kvm_vcpu *vcpu, unsigned long *exit_qual) |
| { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| unsigned int nr = vcpu->arch.exception.nr; |
| |
| if (nr == PF_VECTOR) { |
| if (vcpu->arch.exception.nested_apf) { |
| *exit_qual = vcpu->arch.apf.nested_apf_token; |
| return 1; |
| } |
| /* |
| * FIXME: we must not write CR2 when L1 intercepts an L2 #PF exception. |
| * The fix is to add the ancillary datum (CR2 or DR6) to structs |
| * kvm_queued_exception and kvm_vcpu_events, so that CR2 and DR6 |
| * can be written only when inject_pending_event runs. This should be |
| * conditional on a new capability---if the capability is disabled, |
| * kvm_multiple_exception would write the ancillary information to |
| * CR2 or DR6, for backwards ABI-compatibility. |
| */ |
| if (nested_vmx_is_page_fault_vmexit(vmcs12, |
| vcpu->arch.exception.error_code)) { |
| *exit_qual = vcpu->arch.cr2; |
| return 1; |
| } |
| } else { |
| if (vmcs12->exception_bitmap & (1u << nr)) { |
| if (nr == DB_VECTOR) { |
| *exit_qual = vcpu->arch.dr6; |
| *exit_qual &= ~(DR6_FIXED_1 | DR6_BT); |
| *exit_qual ^= DR6_RTM; |
| } else { |
| *exit_qual = 0; |
| } |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void vmx_clear_hlt(struct kvm_vcpu *vcpu) |
| { |
| /* |
| * Ensure that we clear the HLT state in the VMCS. We don't need to |
| * explicitly skip the instruction because if the HLT state is set, |
| * then the instruction is already executing and RIP has already been |
| * advanced. |
| */ |
| if (kvm_hlt_in_guest(vcpu->kvm) && |
| vmcs_read32(GUEST_ACTIVITY_STATE) == GUEST_ACTIVITY_HLT) |
| vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE); |
| } |
| |
| static void vmx_queue_exception(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| unsigned nr = vcpu->arch.exception.nr; |
| bool has_error_code = vcpu->arch.exception.has_error_code; |
| u32 error_code = vcpu->arch.exception.error_code; |
| u32 intr_info = nr | INTR_INFO_VALID_MASK; |
| |
| if (has_error_code) { |
| vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code); |
| intr_info |= INTR_INFO_DELIVER_CODE_MASK; |
| } |
| |
| if (vmx->rmode.vm86_active) { |
| int inc_eip = 0; |
| if (kvm_exception_is_soft(nr)) |
| inc_eip = vcpu->arch.event_exit_inst_len; |
| if (kvm_inject_realmode_interrupt(vcpu, nr, inc_eip) != EMULATE_DONE) |
| kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); |
| return; |
| } |
| |
| WARN_ON_ONCE(vmx->emulation_required); |
| |
| if (kvm_exception_is_soft(nr)) { |
| vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, |
| vmx->vcpu.arch.event_exit_inst_len); |
| intr_info |= INTR_TYPE_SOFT_EXCEPTION; |
| } else |
| intr_info |= INTR_TYPE_HARD_EXCEPTION; |
| |
| vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info); |
| |
| vmx_clear_hlt(vcpu); |
| } |
| |
| static bool vmx_rdtscp_supported(void) |
| { |
| return cpu_has_vmx_rdtscp(); |
| } |
| |
| static bool vmx_invpcid_supported(void) |
| { |
| return cpu_has_vmx_invpcid(); |
| } |
| |
| /* |
| * Swap MSR entry in host/guest MSR entry array. |
| */ |
| static void move_msr_up(struct vcpu_vmx *vmx, int from, int to) |
| { |
| struct shared_msr_entry tmp; |
| |
| tmp = vmx->guest_msrs[to]; |
| vmx->guest_msrs[to] = vmx->guest_msrs[from]; |
| vmx->guest_msrs[from] = tmp; |
| } |
| |
| /* |
| * Set up the vmcs to automatically save and restore system |
| * msrs. Don't touch the 64-bit msrs if the guest is in legacy |
| * mode, as fiddling with msrs is very expensive. |
| */ |
| static void setup_msrs(struct vcpu_vmx *vmx) |
| { |
| int save_nmsrs, index; |
| |
| save_nmsrs = 0; |
| #ifdef CONFIG_X86_64 |
| if (is_long_mode(&vmx->vcpu)) { |
| index = __find_msr_index(vmx, MSR_SYSCALL_MASK); |
| if (index >= 0) |
| move_msr_up(vmx, index, save_nmsrs++); |
| index = __find_msr_index(vmx, MSR_LSTAR); |
| if (index >= 0) |
| move_msr_up(vmx, index, save_nmsrs++); |
| index = __find_msr_index(vmx, MSR_CSTAR); |
| if (index >= 0) |
| move_msr_up(vmx, index, save_nmsrs++); |
| index = __find_msr_index(vmx, MSR_TSC_AUX); |
| if (index >= 0 && guest_cpuid_has(&vmx->vcpu, X86_FEATURE_RDTSCP)) |
| move_msr_up(vmx, index, save_nmsrs++); |
| /* |
| * MSR_STAR is only needed on long mode guests, and only |
| * if efer.sce is enabled. |
| */ |
| index = __find_msr_index(vmx, MSR_STAR); |
| if ((index >= 0) && (vmx->vcpu.arch.efer & EFER_SCE)) |
| move_msr_up(vmx, index, save_nmsrs++); |
| } |
| #endif |
| index = __find_msr_index(vmx, MSR_EFER); |
| if (index >= 0 && update_transition_efer(vmx, index)) |
| move_msr_up(vmx, index, save_nmsrs++); |
| |
| vmx->save_nmsrs = save_nmsrs; |
| |
| if (cpu_has_vmx_msr_bitmap()) |
| vmx_update_msr_bitmap(&vmx->vcpu); |
| } |
| |
| static u64 vmx_read_l1_tsc_offset(struct kvm_vcpu *vcpu) |
| { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| |
| if (is_guest_mode(vcpu) && |
| (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING)) |
| return vcpu->arch.tsc_offset - vmcs12->tsc_offset; |
| |
| return vcpu->arch.tsc_offset; |
| } |
| |
| /* |
| * writes 'offset' into guest's timestamp counter offset register |
| */ |
| static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset) |
| { |
| if (is_guest_mode(vcpu)) { |
| /* |
| * We're here if L1 chose not to trap WRMSR to TSC. According |
| * to the spec, this should set L1's TSC; The offset that L1 |
| * set for L2 remains unchanged, and still needs to be added |
| * to the newly set TSC to get L2's TSC. |
| */ |
| struct vmcs12 *vmcs12; |
| /* recalculate vmcs02.TSC_OFFSET: */ |
| vmcs12 = get_vmcs12(vcpu); |
| vmcs_write64(TSC_OFFSET, offset + |
| (nested_cpu_has(vmcs12, CPU_BASED_USE_TSC_OFFSETING) ? |
| vmcs12->tsc_offset : 0)); |
| } else { |
| trace_kvm_write_tsc_offset(vcpu->vcpu_id, |
| vmcs_read64(TSC_OFFSET), offset); |
| vmcs_write64(TSC_OFFSET, offset); |
| } |
| } |
| |
| /* |
| * nested_vmx_allowed() checks whether a guest should be allowed to use VMX |
| * instructions and MSRs (i.e., nested VMX). Nested VMX is disabled for |
| * all guests if the "nested" module option is off, and can also be disabled |
| * for a single guest by disabling its VMX cpuid bit. |
| */ |
| static inline bool nested_vmx_allowed(struct kvm_vcpu *vcpu) |
| { |
| return nested && guest_cpuid_has(vcpu, X86_FEATURE_VMX); |
| } |
| |
| /* |
| * nested_vmx_setup_ctls_msrs() sets up variables containing the values to be |
| * returned for the various VMX controls MSRs when nested VMX is enabled. |
| * The same values should also be used to verify that vmcs12 control fields are |
| * valid during nested entry from L1 to L2. |
| * Each of these control msrs has a low and high 32-bit half: A low bit is on |
| * if the corresponding bit in the (32-bit) control field *must* be on, and a |
| * bit in the high half is on if the corresponding bit in the control field |
| * may be on. See also vmx_control_verify(). |
| */ |
| static void nested_vmx_setup_ctls_msrs(struct nested_vmx_msrs *msrs, bool apicv) |
| { |
| if (!nested) { |
| memset(msrs, 0, sizeof(*msrs)); |
| return; |
| } |
| |
| /* |
| * Note that as a general rule, the high half of the MSRs (bits in |
| * the control fields which may be 1) should be initialized by the |
| * intersection of the underlying hardware's MSR (i.e., features which |
| * can be supported) and the list of features we want to expose - |
| * because they are known to be properly supported in our code. |
| * Also, usually, the low half of the MSRs (bits which must be 1) can |
| * be set to 0, meaning that L1 may turn off any of these bits. The |
| * reason is that if one of these bits is necessary, it will appear |
| * in vmcs01 and prepare_vmcs02, when it bitwise-or's the control |
| * fields of vmcs01 and vmcs02, will turn these bits off - and |
| * nested_vmx_exit_reflected() will not pass related exits to L1. |
| * These rules have exceptions below. |
| */ |
| |
| /* pin-based controls */ |
| rdmsr(MSR_IA32_VMX_PINBASED_CTLS, |
| msrs->pinbased_ctls_low, |
| msrs->pinbased_ctls_high); |
| msrs->pinbased_ctls_low |= |
| PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR; |
| msrs->pinbased_ctls_high &= |
| PIN_BASED_EXT_INTR_MASK | |
| PIN_BASED_NMI_EXITING | |
| PIN_BASED_VIRTUAL_NMIS | |
| (apicv ? PIN_BASED_POSTED_INTR : 0); |
| msrs->pinbased_ctls_high |= |
| PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR | |
| PIN_BASED_VMX_PREEMPTION_TIMER; |
| |
| /* exit controls */ |
| rdmsr(MSR_IA32_VMX_EXIT_CTLS, |
| msrs->exit_ctls_low, |
| msrs->exit_ctls_high); |
| msrs->exit_ctls_low = |
| VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR; |
| |
| msrs->exit_ctls_high &= |
| #ifdef CONFIG_X86_64 |
| VM_EXIT_HOST_ADDR_SPACE_SIZE | |
| #endif |
| VM_EXIT_LOAD_IA32_PAT | VM_EXIT_SAVE_IA32_PAT; |
| msrs->exit_ctls_high |= |
| VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR | |
| VM_EXIT_LOAD_IA32_EFER | VM_EXIT_SAVE_IA32_EFER | |
| VM_EXIT_SAVE_VMX_PREEMPTION_TIMER | VM_EXIT_ACK_INTR_ON_EXIT; |
| |
| /* We support free control of debug control saving. */ |
| msrs->exit_ctls_low &= ~VM_EXIT_SAVE_DEBUG_CONTROLS; |
| |
| /* entry controls */ |
| rdmsr(MSR_IA32_VMX_ENTRY_CTLS, |
| msrs->entry_ctls_low, |
| msrs->entry_ctls_high); |
| msrs->entry_ctls_low = |
| VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR; |
| msrs->entry_ctls_high &= |
| #ifdef CONFIG_X86_64 |
| VM_ENTRY_IA32E_MODE | |
| #endif |
| VM_ENTRY_LOAD_IA32_PAT; |
| msrs->entry_ctls_high |= |
| (VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR | VM_ENTRY_LOAD_IA32_EFER); |
| |
| /* We support free control of debug control loading. */ |
| msrs->entry_ctls_low &= ~VM_ENTRY_LOAD_DEBUG_CONTROLS; |
| |
| /* cpu-based controls */ |
| rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, |
| msrs->procbased_ctls_low, |
| msrs->procbased_ctls_high); |
| msrs->procbased_ctls_low = |
| CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR; |
| msrs->procbased_ctls_high &= |
| CPU_BASED_VIRTUAL_INTR_PENDING | |
| CPU_BASED_VIRTUAL_NMI_PENDING | CPU_BASED_USE_TSC_OFFSETING | |
| CPU_BASED_HLT_EXITING | CPU_BASED_INVLPG_EXITING | |
| CPU_BASED_MWAIT_EXITING | CPU_BASED_CR3_LOAD_EXITING | |
| CPU_BASED_CR3_STORE_EXITING | |
| #ifdef CONFIG_X86_64 |
| CPU_BASED_CR8_LOAD_EXITING | CPU_BASED_CR8_STORE_EXITING | |
| #endif |
| CPU_BASED_MOV_DR_EXITING | CPU_BASED_UNCOND_IO_EXITING | |
| CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MONITOR_TRAP_FLAG | |
| CPU_BASED_MONITOR_EXITING | CPU_BASED_RDPMC_EXITING | |
| CPU_BASED_RDTSC_EXITING | CPU_BASED_PAUSE_EXITING | |
| CPU_BASED_TPR_SHADOW | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; |
| /* |
| * We can allow some features even when not supported by the |
| * hardware. For example, L1 can specify an MSR bitmap - and we |
| * can use it to avoid exits to L1 - even when L0 runs L2 |
| * without MSR bitmaps. |
| */ |
| msrs->procbased_ctls_high |= |
| CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR | |
| CPU_BASED_USE_MSR_BITMAPS; |
| |
| /* We support free control of CR3 access interception. */ |
| msrs->procbased_ctls_low &= |
| ~(CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING); |
| |
| /* |
| * secondary cpu-based controls. Do not include those that |
| * depend on CPUID bits, they are added later by vmx_cpuid_update. |
| */ |
| rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2, |
| msrs->secondary_ctls_low, |
| msrs->secondary_ctls_high); |
| msrs->secondary_ctls_low = 0; |
| msrs->secondary_ctls_high &= |
| SECONDARY_EXEC_DESC | |
| SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE | |
| SECONDARY_EXEC_APIC_REGISTER_VIRT | |
| SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY | |
| SECONDARY_EXEC_WBINVD_EXITING; |
| |
| /* |
| * We can emulate "VMCS shadowing," even if the hardware |
| * doesn't support it. |
| */ |
| msrs->secondary_ctls_high |= |
| SECONDARY_EXEC_SHADOW_VMCS; |
| |
| if (enable_ept) { |
| /* nested EPT: emulate EPT also to L1 */ |
| msrs->secondary_ctls_high |= |
| SECONDARY_EXEC_ENABLE_EPT; |
| msrs->ept_caps = VMX_EPT_PAGE_WALK_4_BIT | |
| VMX_EPTP_WB_BIT | VMX_EPT_INVEPT_BIT; |
| if (cpu_has_vmx_ept_execute_only()) |
| msrs->ept_caps |= |
| VMX_EPT_EXECUTE_ONLY_BIT; |
| msrs->ept_caps &= vmx_capability.ept; |
| msrs->ept_caps |= VMX_EPT_EXTENT_GLOBAL_BIT | |
| VMX_EPT_EXTENT_CONTEXT_BIT | VMX_EPT_2MB_PAGE_BIT | |
| VMX_EPT_1GB_PAGE_BIT; |
| if (enable_ept_ad_bits) { |
| msrs->secondary_ctls_high |= |
| SECONDARY_EXEC_ENABLE_PML; |
| msrs->ept_caps |= VMX_EPT_AD_BIT; |
| } |
| } |
| |
| if (cpu_has_vmx_vmfunc()) { |
| msrs->secondary_ctls_high |= |
| SECONDARY_EXEC_ENABLE_VMFUNC; |
| /* |
| * Advertise EPTP switching unconditionally |
| * since we emulate it |
| */ |
| if (enable_ept) |
| msrs->vmfunc_controls = |
| VMX_VMFUNC_EPTP_SWITCHING; |
| } |
| |
| /* |
| * Old versions of KVM use the single-context version without |
| * checking for support, so declare that it is supported even |
| * though it is treated as global context. The alternative is |
| * not failing the single-context invvpid, and it is worse. |
| */ |
| if (enable_vpid) { |
| msrs->secondary_ctls_high |= |
| SECONDARY_EXEC_ENABLE_VPID; |
| msrs->vpid_caps = VMX_VPID_INVVPID_BIT | |
| VMX_VPID_EXTENT_SUPPORTED_MASK; |
| } |
| |
| if (enable_unrestricted_guest) |
| msrs->secondary_ctls_high |= |
| SECONDARY_EXEC_UNRESTRICTED_GUEST; |
| |
| if (flexpriority_enabled) |
| msrs->secondary_ctls_high |= |
| SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; |
| |
| /* miscellaneous data */ |
| rdmsr(MSR_IA32_VMX_MISC, |
| msrs->misc_low, |
| msrs->misc_high); |
| msrs->misc_low &= VMX_MISC_SAVE_EFER_LMA; |
| msrs->misc_low |= |
| MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS | |
| VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE | |
| VMX_MISC_ACTIVITY_HLT; |
| msrs->misc_high = 0; |
| |
| /* |
| * This MSR reports some information about VMX support. We |
| * should return information about the VMX we emulate for the |
| * guest, and the VMCS structure we give it - not about the |
| * VMX support of the underlying hardware. |
| */ |
| msrs->basic = |
| VMCS12_REVISION | |
| VMX_BASIC_TRUE_CTLS | |
| ((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) | |
| (VMX_BASIC_MEM_TYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT); |
| |
| if (cpu_has_vmx_basic_inout()) |
| msrs->basic |= VMX_BASIC_INOUT; |
| |
| /* |
| * These MSRs specify bits which the guest must keep fixed on |
| * while L1 is in VMXON mode (in L1's root mode, or running an L2). |
| * We picked the standard core2 setting. |
| */ |
| #define VMXON_CR0_ALWAYSON (X86_CR0_PE | X86_CR0_PG | X86_CR0_NE) |
| #define VMXON_CR4_ALWAYSON X86_CR4_VMXE |
| msrs->cr0_fixed0 = VMXON_CR0_ALWAYSON; |
| msrs->cr4_fixed0 = VMXON_CR4_ALWAYSON; |
| |
| /* These MSRs specify bits which the guest must keep fixed off. */ |
| rdmsrl(MSR_IA32_VMX_CR0_FIXED1, msrs->cr0_fixed1); |
| rdmsrl(MSR_IA32_VMX_CR4_FIXED1, msrs->cr4_fixed1); |
| |
| /* highest index: VMX_PREEMPTION_TIMER_VALUE */ |
| msrs->vmcs_enum = VMCS12_MAX_FIELD_INDEX << 1; |
| } |
| |
| /* |
| * if fixed0[i] == 1: val[i] must be 1 |
| * if fixed1[i] == 0: val[i] must be 0 |
| */ |
| static inline bool fixed_bits_valid(u64 val, u64 fixed0, u64 fixed1) |
| { |
| return ((val & fixed1) | fixed0) == val; |
| } |
| |
| static inline bool vmx_control_verify(u32 control, u32 low, u32 high) |
| { |
| return fixed_bits_valid(control, low, high); |
| } |
| |
| static inline u64 vmx_control_msr(u32 low, u32 high) |
| { |
| return low | ((u64)high << 32); |
| } |
| |
| static bool is_bitwise_subset(u64 superset, u64 subset, u64 mask) |
| { |
| superset &= mask; |
| subset &= mask; |
| |
| return (superset | subset) == superset; |
| } |
| |
| static int vmx_restore_vmx_basic(struct vcpu_vmx *vmx, u64 data) |
| { |
| const u64 feature_and_reserved = |
| /* feature (except bit 48; see below) */ |
| BIT_ULL(49) | BIT_ULL(54) | BIT_ULL(55) | |
| /* reserved */ |
| BIT_ULL(31) | GENMASK_ULL(47, 45) | GENMASK_ULL(63, 56); |
| u64 vmx_basic = vmx->nested.msrs.basic; |
| |
| if (!is_bitwise_subset(vmx_basic, data, feature_and_reserved)) |
| return -EINVAL; |
| |
| /* |
| * KVM does not emulate a version of VMX that constrains physical |
| * addresses of VMX structures (e.g. VMCS) to 32-bits. |
| */ |
| if (data & BIT_ULL(48)) |
| return -EINVAL; |
| |
| if (vmx_basic_vmcs_revision_id(vmx_basic) != |
| vmx_basic_vmcs_revision_id(data)) |
| return -EINVAL; |
| |
| if (vmx_basic_vmcs_size(vmx_basic) > vmx_basic_vmcs_size(data)) |
| return -EINVAL; |
| |
| vmx->nested.msrs.basic = data; |
| return 0; |
| } |
| |
| static int |
| vmx_restore_control_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data) |
| { |
| u64 supported; |
| u32 *lowp, *highp; |
| |
| switch (msr_index) { |
| case MSR_IA32_VMX_TRUE_PINBASED_CTLS: |
| lowp = &vmx->nested.msrs.pinbased_ctls_low; |
| highp = &vmx->nested.msrs.pinbased_ctls_high; |
| break; |
| case MSR_IA32_VMX_TRUE_PROCBASED_CTLS: |
| lowp = &vmx->nested.msrs.procbased_ctls_low; |
| highp = &vmx->nested.msrs.procbased_ctls_high; |
| break; |
| case MSR_IA32_VMX_TRUE_EXIT_CTLS: |
| lowp = &vmx->nested.msrs.exit_ctls_low; |
| highp = &vmx->nested.msrs.exit_ctls_high; |
| break; |
| case MSR_IA32_VMX_TRUE_ENTRY_CTLS: |
| lowp = &vmx->nested.msrs.entry_ctls_low; |
| highp = &vmx->nested.msrs.entry_ctls_high; |
| break; |
| case MSR_IA32_VMX_PROCBASED_CTLS2: |
| lowp = &vmx->nested.msrs.secondary_ctls_low; |
| highp = &vmx->nested.msrs.secondary_ctls_high; |
| break; |
| default: |
| BUG(); |
| } |
| |
| supported = vmx_control_msr(*lowp, *highp); |
| |
| /* Check must-be-1 bits are still 1. */ |
| if (!is_bitwise_subset(data, supported, GENMASK_ULL(31, 0))) |
| return -EINVAL; |
| |
| /* Check must-be-0 bits are still 0. */ |
| if (!is_bitwise_subset(supported, data, GENMASK_ULL(63, 32))) |
| return -EINVAL; |
| |
| *lowp = data; |
| *highp = data >> 32; |
| return 0; |
| } |
| |
| static int vmx_restore_vmx_misc(struct vcpu_vmx *vmx, u64 data) |
| { |
| const u64 feature_and_reserved_bits = |
| /* feature */ |
| BIT_ULL(5) | GENMASK_ULL(8, 6) | BIT_ULL(14) | BIT_ULL(15) | |
| BIT_ULL(28) | BIT_ULL(29) | BIT_ULL(30) | |
| /* reserved */ |
| GENMASK_ULL(13, 9) | BIT_ULL(31); |
| u64 vmx_misc; |
| |
| vmx_misc = vmx_control_msr(vmx->nested.msrs.misc_low, |
| vmx->nested.msrs.misc_high); |
| |
| if (!is_bitwise_subset(vmx_misc, data, feature_and_reserved_bits)) |
| return -EINVAL; |
| |
| if ((vmx->nested.msrs.pinbased_ctls_high & |
| PIN_BASED_VMX_PREEMPTION_TIMER) && |
| vmx_misc_preemption_timer_rate(data) != |
| vmx_misc_preemption_timer_rate(vmx_misc)) |
| return -EINVAL; |
| |
| if (vmx_misc_cr3_count(data) > vmx_misc_cr3_count(vmx_misc)) |
| return -EINVAL; |
| |
| if (vmx_misc_max_msr(data) > vmx_misc_max_msr(vmx_misc)) |
| return -EINVAL; |
| |
| if (vmx_misc_mseg_revid(data) != vmx_misc_mseg_revid(vmx_misc)) |
| return -EINVAL; |
| |
| vmx->nested.msrs.misc_low = data; |
| vmx->nested.msrs.misc_high = data >> 32; |
| |
| /* |
| * If L1 has read-only VM-exit information fields, use the |
| * less permissive vmx_vmwrite_bitmap to specify write |
| * permissions for the shadow VMCS. |
| */ |
| if (enable_shadow_vmcs && !nested_cpu_has_vmwrite_any_field(&vmx->vcpu)) |
| vmcs_write64(VMWRITE_BITMAP, __pa(vmx_vmwrite_bitmap)); |
| |
| return 0; |
| } |
| |
| static int vmx_restore_vmx_ept_vpid_cap(struct vcpu_vmx *vmx, u64 data) |
| { |
| u64 vmx_ept_vpid_cap; |
| |
| vmx_ept_vpid_cap = vmx_control_msr(vmx->nested.msrs.ept_caps, |
| vmx->nested.msrs.vpid_caps); |
| |
| /* Every bit is either reserved or a feature bit. */ |
| if (!is_bitwise_subset(vmx_ept_vpid_cap, data, -1ULL)) |
| return -EINVAL; |
| |
| vmx->nested.msrs.ept_caps = data; |
| vmx->nested.msrs.vpid_caps = data >> 32; |
| return 0; |
| } |
| |
| static int vmx_restore_fixed0_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data) |
| { |
| u64 *msr; |
| |
| switch (msr_index) { |
| case MSR_IA32_VMX_CR0_FIXED0: |
| msr = &vmx->nested.msrs.cr0_fixed0; |
| break; |
| case MSR_IA32_VMX_CR4_FIXED0: |
| msr = &vmx->nested.msrs.cr4_fixed0; |
| break; |
| default: |
| BUG(); |
| } |
| |
| /* |
| * 1 bits (which indicates bits which "must-be-1" during VMX operation) |
| * must be 1 in the restored value. |
| */ |
| if (!is_bitwise_subset(data, *msr, -1ULL)) |
| return -EINVAL; |
| |
| *msr = data; |
| return 0; |
| } |
| |
| /* |
| * Called when userspace is restoring VMX MSRs. |
| * |
| * Returns 0 on success, non-0 otherwise. |
| */ |
| static int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| /* |
| * Don't allow changes to the VMX capability MSRs while the vCPU |
| * is in VMX operation. |
| */ |
| if (vmx->nested.vmxon) |
| return -EBUSY; |
| |
| switch (msr_index) { |
| case MSR_IA32_VMX_BASIC: |
| return vmx_restore_vmx_basic(vmx, data); |
| case MSR_IA32_VMX_PINBASED_CTLS: |
| case MSR_IA32_VMX_PROCBASED_CTLS: |
| case MSR_IA32_VMX_EXIT_CTLS: |
| case MSR_IA32_VMX_ENTRY_CTLS: |
| /* |
| * The "non-true" VMX capability MSRs are generated from the |
| * "true" MSRs, so we do not support restoring them directly. |
| * |
| * If userspace wants to emulate VMX_BASIC[55]=0, userspace |
| * should restore the "true" MSRs with the must-be-1 bits |
| * set according to the SDM Vol 3. A.2 "RESERVED CONTROLS AND |
| * DEFAULT SETTINGS". |
| */ |
| return -EINVAL; |
| case MSR_IA32_VMX_TRUE_PINBASED_CTLS: |
| case MSR_IA32_VMX_TRUE_PROCBASED_CTLS: |
| case MSR_IA32_VMX_TRUE_EXIT_CTLS: |
| case MSR_IA32_VMX_TRUE_ENTRY_CTLS: |
| case MSR_IA32_VMX_PROCBASED_CTLS2: |
| return vmx_restore_control_msr(vmx, msr_index, data); |
| case MSR_IA32_VMX_MISC: |
| return vmx_restore_vmx_misc(vmx, data); |
| case MSR_IA32_VMX_CR0_FIXED0: |
| case MSR_IA32_VMX_CR4_FIXED0: |
| return vmx_restore_fixed0_msr(vmx, msr_index, data); |
| case MSR_IA32_VMX_CR0_FIXED1: |
| case MSR_IA32_VMX_CR4_FIXED1: |
| /* |
| * These MSRs are generated based on the vCPU's CPUID, so we |
| * do not support restoring them directly. |
| */ |
| return -EINVAL; |
| case MSR_IA32_VMX_EPT_VPID_CAP: |
| return vmx_restore_vmx_ept_vpid_cap(vmx, data); |
| case MSR_IA32_VMX_VMCS_ENUM: |
| vmx->nested.msrs.vmcs_enum = data; |
| return 0; |
| default: |
| /* |
| * The rest of the VMX capability MSRs do not support restore. |
| */ |
| return -EINVAL; |
| } |
| } |
| |
| /* Returns 0 on success, non-0 otherwise. */ |
| static int vmx_get_vmx_msr(struct nested_vmx_msrs *msrs, u32 msr_index, u64 *pdata) |
| { |
| switch (msr_index) { |
| case MSR_IA32_VMX_BASIC: |
| *pdata = msrs->basic; |
| break; |
| case MSR_IA32_VMX_TRUE_PINBASED_CTLS: |
| case MSR_IA32_VMX_PINBASED_CTLS: |
| *pdata = vmx_control_msr( |
| msrs->pinbased_ctls_low, |
| msrs->pinbased_ctls_high); |
| if (msr_index == MSR_IA32_VMX_PINBASED_CTLS) |
| *pdata |= PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR; |
| break; |
| case MSR_IA32_VMX_TRUE_PROCBASED_CTLS: |
| case MSR_IA32_VMX_PROCBASED_CTLS: |
| *pdata = vmx_control_msr( |
| msrs->procbased_ctls_low, |
| msrs->procbased_ctls_high); |
| if (msr_index == MSR_IA32_VMX_PROCBASED_CTLS) |
| *pdata |= CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR; |
| break; |
| case MSR_IA32_VMX_TRUE_EXIT_CTLS: |
| case MSR_IA32_VMX_EXIT_CTLS: |
| *pdata = vmx_control_msr( |
| msrs->exit_ctls_low, |
| msrs->exit_ctls_high); |
| if (msr_index == MSR_IA32_VMX_EXIT_CTLS) |
| *pdata |= VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR; |
| break; |
| case MSR_IA32_VMX_TRUE_ENTRY_CTLS: |
| case MSR_IA32_VMX_ENTRY_CTLS: |
| *pdata = vmx_control_msr( |
| msrs->entry_ctls_low, |
| msrs->entry_ctls_high); |
| if (msr_index == MSR_IA32_VMX_ENTRY_CTLS) |
| *pdata |= VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR; |
| break; |
| case MSR_IA32_VMX_MISC: |
| *pdata = vmx_control_msr( |
| msrs->misc_low, |
| msrs->misc_high); |
| break; |
| case MSR_IA32_VMX_CR0_FIXED0: |
| *pdata = msrs->cr0_fixed0; |
| break; |
| case MSR_IA32_VMX_CR0_FIXED1: |
| *pdata = msrs->cr0_fixed1; |
| break; |
| case MSR_IA32_VMX_CR4_FIXED0: |
| *pdata = msrs->cr4_fixed0; |
| break; |
| case MSR_IA32_VMX_CR4_FIXED1: |
| *pdata = msrs->cr4_fixed1; |
| break; |
| case MSR_IA32_VMX_VMCS_ENUM: |
| *pdata = msrs->vmcs_enum; |
| break; |
| case MSR_IA32_VMX_PROCBASED_CTLS2: |
| *pdata = vmx_control_msr( |
| msrs->secondary_ctls_low, |
| msrs->secondary_ctls_high); |
| break; |
| case MSR_IA32_VMX_EPT_VPID_CAP: |
| *pdata = msrs->ept_caps | |
| ((u64)msrs->vpid_caps << 32); |
| break; |
| case MSR_IA32_VMX_VMFUNC: |
| *pdata = msrs->vmfunc_controls; |
| break; |
| default: |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static inline bool vmx_feature_control_msr_valid(struct kvm_vcpu *vcpu, |
| uint64_t val) |
| { |
| uint64_t valid_bits = to_vmx(vcpu)->msr_ia32_feature_control_valid_bits; |
| |
| return !(val & ~valid_bits); |
| } |
| |
| static int vmx_get_msr_feature(struct kvm_msr_entry *msr) |
| { |
| switch (msr->index) { |
| case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC: |
| if (!nested) |
| return 1; |
| return vmx_get_vmx_msr(&vmcs_config.nested, msr->index, &msr->data); |
| default: |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Reads an msr value (of 'msr_index') into 'pdata'. |
| * Returns 0 on success, non-0 otherwise. |
| * Assumes vcpu_load() was already called. |
| */ |
| static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct shared_msr_entry *msr; |
| |
| switch (msr_info->index) { |
| #ifdef CONFIG_X86_64 |
| case MSR_FS_BASE: |
| msr_info->data = vmcs_readl(GUEST_FS_BASE); |
| break; |
| case MSR_GS_BASE: |
| msr_info->data = vmcs_readl(GUEST_GS_BASE); |
| break; |
| case MSR_KERNEL_GS_BASE: |
| msr_info->data = vmx_read_guest_kernel_gs_base(vmx); |
| break; |
| #endif |
| case MSR_EFER: |
| return kvm_get_msr_common(vcpu, msr_info); |
| case MSR_IA32_SPEC_CTRL: |
| if (!msr_info->host_initiated && |
| !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL)) |
| return 1; |
| |
| msr_info->data = to_vmx(vcpu)->spec_ctrl; |
| break; |
| case MSR_IA32_ARCH_CAPABILITIES: |
| if (!msr_info->host_initiated && |
| !guest_cpuid_has(vcpu, X86_FEATURE_ARCH_CAPABILITIES)) |
| return 1; |
| msr_info->data = to_vmx(vcpu)->arch_capabilities; |
| break; |
| case MSR_IA32_SYSENTER_CS: |
| msr_info->data = vmcs_read32(GUEST_SYSENTER_CS); |
| break; |
| case MSR_IA32_SYSENTER_EIP: |
| msr_info->data = vmcs_readl(GUEST_SYSENTER_EIP); |
| break; |
| case MSR_IA32_SYSENTER_ESP: |
| msr_info->data = vmcs_readl(GUEST_SYSENTER_ESP); |
| break; |
| case MSR_IA32_BNDCFGS: |
| if (!kvm_mpx_supported() || |
| (!msr_info->host_initiated && |
| !guest_cpuid_has(vcpu, X86_FEATURE_MPX))) |
| return 1; |
| msr_info->data = vmcs_read64(GUEST_BNDCFGS); |
| break; |
| case MSR_IA32_MCG_EXT_CTL: |
| if (!msr_info->host_initiated && |
| !(vmx->msr_ia32_feature_control & |
| FEATURE_CONTROL_LMCE)) |
| return 1; |
| msr_info->data = vcpu->arch.mcg_ext_ctl; |
| break; |
| case MSR_IA32_FEATURE_CONTROL: |
| msr_info->data = vmx->msr_ia32_feature_control; |
| break; |
| case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC: |
| if (!nested_vmx_allowed(vcpu)) |
| return 1; |
| return vmx_get_vmx_msr(&vmx->nested.msrs, msr_info->index, |
| &msr_info->data); |
| case MSR_IA32_XSS: |
| if (!vmx_xsaves_supported()) |
| return 1; |
| msr_info->data = vcpu->arch.ia32_xss; |
| break; |
| case MSR_TSC_AUX: |
| if (!msr_info->host_initiated && |
| !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP)) |
| return 1; |
| /* Otherwise falls through */ |
| default: |
| msr = find_msr_entry(vmx, msr_info->index); |
| if (msr) { |
| msr_info->data = msr->data; |
| break; |
| } |
| return kvm_get_msr_common(vcpu, msr_info); |
| } |
| |
| return 0; |
| } |
| |
| static void vmx_leave_nested(struct kvm_vcpu *vcpu); |
| |
| /* |
| * Writes msr value into into the appropriate "register". |
| * Returns 0 on success, non-0 otherwise. |
| * Assumes vcpu_load() was already called. |
| */ |
| static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct shared_msr_entry *msr; |
| int ret = 0; |
| u32 msr_index = msr_info->index; |
| u64 data = msr_info->data; |
| |
| switch (msr_index) { |
| case MSR_EFER: |
| ret = kvm_set_msr_common(vcpu, msr_info); |
| break; |
| #ifdef CONFIG_X86_64 |
| case MSR_FS_BASE: |
| vmx_segment_cache_clear(vmx); |
| vmcs_writel(GUEST_FS_BASE, data); |
| break; |
| case MSR_GS_BASE: |
| vmx_segment_cache_clear(vmx); |
| vmcs_writel(GUEST_GS_BASE, data); |
| break; |
| case MSR_KERNEL_GS_BASE: |
| vmx_write_guest_kernel_gs_base(vmx, data); |
| break; |
| #endif |
| case MSR_IA32_SYSENTER_CS: |
| vmcs_write32(GUEST_SYSENTER_CS, data); |
| break; |
| case MSR_IA32_SYSENTER_EIP: |
| vmcs_writel(GUEST_SYSENTER_EIP, data); |
| break; |
| case MSR_IA32_SYSENTER_ESP: |
| vmcs_writel(GUEST_SYSENTER_ESP, data); |
| break; |
| case MSR_IA32_BNDCFGS: |
| if (!kvm_mpx_supported() || |
| (!msr_info->host_initiated && |
| !guest_cpuid_has(vcpu, X86_FEATURE_MPX))) |
| return 1; |
| if (is_noncanonical_address(data & PAGE_MASK, vcpu) || |
| (data & MSR_IA32_BNDCFGS_RSVD)) |
| return 1; |
| vmcs_write64(GUEST_BNDCFGS, data); |
| break; |
| case MSR_IA32_SPEC_CTRL: |
| if (!msr_info->host_initiated && |
| !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL)) |
| return 1; |
| |
| /* The STIBP bit doesn't fault even if it's not advertised */ |
| if (data & ~(SPEC_CTRL_IBRS | SPEC_CTRL_STIBP | SPEC_CTRL_SSBD)) |
| return 1; |
| |
| vmx->spec_ctrl = data; |
| |
| if (!data) |
| break; |
| |
| /* |
| * For non-nested: |
| * When it's written (to non-zero) for the first time, pass |
| * it through. |
| * |
| * For nested: |
| * The handling of the MSR bitmap for L2 guests is done in |
| * nested_vmx_merge_msr_bitmap. We should not touch the |
| * vmcs02.msr_bitmap here since it gets completely overwritten |
| * in the merging. We update the vmcs01 here for L1 as well |
| * since it will end up touching the MSR anyway now. |
| */ |
| vmx_disable_intercept_for_msr(vmx->vmcs01.msr_bitmap, |
| MSR_IA32_SPEC_CTRL, |
| MSR_TYPE_RW); |
| break; |
| case MSR_IA32_PRED_CMD: |
| if (!msr_info->host_initiated && |
| !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL)) |
| return 1; |
| |
| if (data & ~PRED_CMD_IBPB) |
| return 1; |
| |
| if (!data) |
| break; |
| |
| wrmsrl(MSR_IA32_PRED_CMD, PRED_CMD_IBPB); |
| |
| /* |
| * For non-nested: |
| * When it's written (to non-zero) for the first time, pass |
| * it through. |
| * |
| * For nested: |
| * The handling of the MSR bitmap for L2 guests is done in |
| * nested_vmx_merge_msr_bitmap. We should not touch the |
| * vmcs02.msr_bitmap here since it gets completely overwritten |
| * in the merging. |
| */ |
| vmx_disable_intercept_for_msr(vmx->vmcs01.msr_bitmap, MSR_IA32_PRED_CMD, |
| MSR_TYPE_W); |
| break; |
| case MSR_IA32_ARCH_CAPABILITIES: |
| if (!msr_info->host_initiated) |
| return 1; |
| vmx->arch_capabilities = data; |
| break; |
| case MSR_IA32_CR_PAT: |
| if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) { |
| if (!kvm_mtrr_valid(vcpu, MSR_IA32_CR_PAT, data)) |
| return 1; |
| vmcs_write64(GUEST_IA32_PAT, data); |
| vcpu->arch.pat = data; |
| break; |
| } |
| ret = kvm_set_msr_common(vcpu, msr_info); |
| break; |
| case MSR_IA32_TSC_ADJUST: |
| ret = kvm_set_msr_common(vcpu, msr_info); |
| break; |
| case MSR_IA32_MCG_EXT_CTL: |
| if ((!msr_info->host_initiated && |
| !(to_vmx(vcpu)->msr_ia32_feature_control & |
| FEATURE_CONTROL_LMCE)) || |
| (data & ~MCG_EXT_CTL_LMCE_EN)) |
| return 1; |
| vcpu->arch.mcg_ext_ctl = data; |
| break; |
| case MSR_IA32_FEATURE_CONTROL: |
| if (!vmx_feature_control_msr_valid(vcpu, data) || |
| (to_vmx(vcpu)->msr_ia32_feature_control & |
| FEATURE_CONTROL_LOCKED && !msr_info->host_initiated)) |
| return 1; |
| vmx->msr_ia32_feature_control = data; |
| if (msr_info->host_initiated && data == 0) |
| vmx_leave_nested(vcpu); |
| break; |
| case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC: |
| if (!msr_info->host_initiated) |
| return 1; /* they are read-only */ |
| if (!nested_vmx_allowed(vcpu)) |
| return 1; |
| return vmx_set_vmx_msr(vcpu, msr_index, data); |
| case MSR_IA32_XSS: |
| if (!vmx_xsaves_supported()) |
| return 1; |
| /* |
| * The only supported bit as of Skylake is bit 8, but |
| * it is not supported on KVM. |
| */ |
| if (data != 0) |
| return 1; |
| vcpu->arch.ia32_xss = data; |
| if (vcpu->arch.ia32_xss != host_xss) |
| add_atomic_switch_msr(vmx, MSR_IA32_XSS, |
| vcpu->arch.ia32_xss, host_xss, false); |
| else |
| clear_atomic_switch_msr(vmx, MSR_IA32_XSS); |
| break; |
| case MSR_TSC_AUX: |
| if (!msr_info->host_initiated && |
| !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP)) |
| return 1; |
| /* Check reserved bit, higher 32 bits should be zero */ |
| if ((data >> 32) != 0) |
| return 1; |
| /* Otherwise falls through */ |
| default: |
| msr = find_msr_entry(vmx, msr_index); |
| if (msr) { |
| u64 old_msr_data = msr->data; |
| msr->data = data; |
| if (msr - vmx->guest_msrs < vmx->save_nmsrs) { |
| preempt_disable(); |
| ret = kvm_set_shared_msr(msr->index, msr->data, |
| msr->mask); |
| preempt_enable(); |
| if (ret) |
| msr->data = old_msr_data; |
| } |
| break; |
| } |
| ret = kvm_set_msr_common(vcpu, msr_info); |
| } |
| |
| return ret; |
| } |
| |
| static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg) |
| { |
| __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail); |
| switch (reg) { |
| case VCPU_REGS_RSP: |
| vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP); |
| break; |
| case VCPU_REGS_RIP: |
| vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP); |
| break; |
| case VCPU_EXREG_PDPTR: |
| if (enable_ept) |
| ept_save_pdptrs(vcpu); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static __init int cpu_has_kvm_support(void) |
| { |
| return cpu_has_vmx(); |
| } |
| |
| static __init int vmx_disabled_by_bios(void) |
| { |
| u64 msr; |
| |
| rdmsrl(MSR_IA32_FEATURE_CONTROL, msr); |
| if (msr & FEATURE_CONTROL_LOCKED) { |
| /* launched w/ TXT and VMX disabled */ |
| if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX) |
| && tboot_enabled()) |
| return 1; |
| /* launched w/o TXT and VMX only enabled w/ TXT */ |
| if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX) |
| && (msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX) |
| && !tboot_enabled()) { |
| printk(KERN_WARNING "kvm: disable TXT in the BIOS or " |
| "activate TXT before enabling KVM\n"); |
| return 1; |
| } |
| /* launched w/o TXT and VMX disabled */ |
| if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX) |
| && !tboot_enabled()) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static void kvm_cpu_vmxon(u64 addr) |
| { |
| cr4_set_bits(X86_CR4_VMXE); |
| intel_pt_handle_vmx(1); |
| |
| asm volatile (ASM_VMX_VMXON_RAX |
| : : "a"(&addr), "m"(addr) |
| : "memory", "cc"); |
| } |
| |
| static int hardware_enable(void) |
| { |
| int cpu = raw_smp_processor_id(); |
| u64 phys_addr = __pa(per_cpu(vmxarea, cpu)); |
| u64 old, test_bits; |
| |
| if (cr4_read_shadow() & X86_CR4_VMXE) |
| return -EBUSY; |
| |
| /* |
| * This can happen if we hot-added a CPU but failed to allocate |
| * VP assist page for it. |
| */ |
| if (static_branch_unlikely(&enable_evmcs) && |
| !hv_get_vp_assist_page(cpu)) |
| return -EFAULT; |
| |
| INIT_LIST_HEAD(&per_cpu(loaded_vmcss_on_cpu, cpu)); |
| INIT_LIST_HEAD(&per_cpu(blocked_vcpu_on_cpu, cpu)); |
| spin_lock_init(&per_cpu(blocked_vcpu_on_cpu_lock, cpu)); |
| |
| /* |
| * Now we can enable the vmclear operation in kdump |
| * since the loaded_vmcss_on_cpu list on this cpu |
| * has been initialized. |
| * |
| * Though the cpu is not in VMX operation now, there |
| * is no problem to enable the vmclear operation |
| * for the loaded_vmcss_on_cpu list is empty! |
| */ |
| crash_enable_local_vmclear(cpu); |
| |
| rdmsrl(MSR_IA32_FEATURE_CONTROL, old); |
| |
| test_bits = FEATURE_CONTROL_LOCKED; |
| test_bits |= FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX; |
| if (tboot_enabled()) |
| test_bits |= FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX; |
| |
| if ((old & test_bits) != test_bits) { |
| /* enable and lock */ |
| wrmsrl(MSR_IA32_FEATURE_CONTROL, old | test_bits); |
| } |
| kvm_cpu_vmxon(phys_addr); |
| if (enable_ept) |
| ept_sync_global(); |
| |
| return 0; |
| } |
| |
| static void vmclear_local_loaded_vmcss(void) |
| { |
| int cpu = raw_smp_processor_id(); |
| struct loaded_vmcs *v, *n; |
| |
| list_for_each_entry_safe(v, n, &per_cpu(loaded_vmcss_on_cpu, cpu), |
| loaded_vmcss_on_cpu_link) |
| __loaded_vmcs_clear(v); |
| } |
| |
| |
| /* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot() |
| * tricks. |
| */ |
| static void kvm_cpu_vmxoff(void) |
| { |
| asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc"); |
| |
| intel_pt_handle_vmx(0); |
| cr4_clear_bits(X86_CR4_VMXE); |
| } |
| |
| static void hardware_disable(void) |
| { |
| vmclear_local_loaded_vmcss(); |
| kvm_cpu_vmxoff(); |
| } |
| |
| static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt, |
| u32 msr, u32 *result) |
| { |
| u32 vmx_msr_low, vmx_msr_high; |
| u32 ctl = ctl_min | ctl_opt; |
| |
| rdmsr(msr, vmx_msr_low, vmx_msr_high); |
| |
| ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */ |
| ctl |= vmx_msr_low; /* bit == 1 in low word ==> must be one */ |
| |
| /* Ensure minimum (required) set of control bits are supported. */ |
| if (ctl_min & ~ctl) |
| return -EIO; |
| |
| *result = ctl; |
| return 0; |
| } |
| |
| static __init bool allow_1_setting(u32 msr, u32 ctl) |
| { |
| u32 vmx_msr_low, vmx_msr_high; |
| |
| rdmsr(msr, vmx_msr_low, vmx_msr_high); |
| return vmx_msr_high & ctl; |
| } |
| |
| static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf) |
| { |
| u32 vmx_msr_low, vmx_msr_high; |
| u32 min, opt, min2, opt2; |
| u32 _pin_based_exec_control = 0; |
| u32 _cpu_based_exec_control = 0; |
| u32 _cpu_based_2nd_exec_control = 0; |
| u32 _vmexit_control = 0; |
| u32 _vmentry_control = 0; |
| |
| memset(vmcs_conf, 0, sizeof(*vmcs_conf)); |
| min = CPU_BASED_HLT_EXITING | |
| #ifdef CONFIG_X86_64 |
| CPU_BASED_CR8_LOAD_EXITING | |
| CPU_BASED_CR8_STORE_EXITING | |
| #endif |
| CPU_BASED_CR3_LOAD_EXITING | |
| CPU_BASED_CR3_STORE_EXITING | |
| CPU_BASED_UNCOND_IO_EXITING | |
| CPU_BASED_MOV_DR_EXITING | |
| CPU_BASED_USE_TSC_OFFSETING | |
| CPU_BASED_MWAIT_EXITING | |
| CPU_BASED_MONITOR_EXITING | |
| CPU_BASED_INVLPG_EXITING | |
| CPU_BASED_RDPMC_EXITING; |
| |
| opt = CPU_BASED_TPR_SHADOW | |
| CPU_BASED_USE_MSR_BITMAPS | |
| CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; |
| if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS, |
| &_cpu_based_exec_control) < 0) |
| return -EIO; |
| #ifdef CONFIG_X86_64 |
| if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW)) |
| _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING & |
| ~CPU_BASED_CR8_STORE_EXITING; |
| #endif |
| if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) { |
| min2 = 0; |
| opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | |
| SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE | |
| SECONDARY_EXEC_WBINVD_EXITING | |
| SECONDARY_EXEC_ENABLE_VPID | |
| SECONDARY_EXEC_ENABLE_EPT | |
| SECONDARY_EXEC_UNRESTRICTED_GUEST | |
| SECONDARY_EXEC_PAUSE_LOOP_EXITING | |
| SECONDARY_EXEC_DESC | |
| SECONDARY_EXEC_RDTSCP | |
| SECONDARY_EXEC_ENABLE_INVPCID | |
| SECONDARY_EXEC_APIC_REGISTER_VIRT | |
| SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY | |
| SECONDARY_EXEC_SHADOW_VMCS | |
| SECONDARY_EXEC_XSAVES | |
| SECONDARY_EXEC_RDSEED_EXITING | |
| SECONDARY_EXEC_RDRAND_EXITING | |
| SECONDARY_EXEC_ENABLE_PML | |
| SECONDARY_EXEC_TSC_SCALING | |
| SECONDARY_EXEC_ENABLE_VMFUNC | |
| SECONDARY_EXEC_ENCLS_EXITING; |
| if (adjust_vmx_controls(min2, opt2, |
| MSR_IA32_VMX_PROCBASED_CTLS2, |
| &_cpu_based_2nd_exec_control) < 0) |
| return -EIO; |
| } |
| #ifndef CONFIG_X86_64 |
| if (!(_cpu_based_2nd_exec_control & |
| SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) |
| _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW; |
| #endif |
| |
| if (!(_cpu_based_exec_control & CPU_BASED_TPR_SHADOW)) |
| _cpu_based_2nd_exec_control &= ~( |
| SECONDARY_EXEC_APIC_REGISTER_VIRT | |
| SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE | |
| SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY); |
| |
| rdmsr_safe(MSR_IA32_VMX_EPT_VPID_CAP, |
| &vmx_capability.ept, &vmx_capability.vpid); |
| |
| if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) { |
| /* CR3 accesses and invlpg don't need to cause VM Exits when EPT |
| enabled */ |
| _cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING | |
| CPU_BASED_CR3_STORE_EXITING | |
| CPU_BASED_INVLPG_EXITING); |
| } else if (vmx_capability.ept) { |
| vmx_capability.ept = 0; |
| pr_warn_once("EPT CAP should not exist if not support " |
| "1-setting enable EPT VM-execution control\n"); |
| } |
| if (!(_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_VPID) && |
| vmx_capability.vpid) { |
| vmx_capability.vpid = 0; |
| pr_warn_once("VPID CAP should not exist if not support " |
| "1-setting enable VPID VM-execution control\n"); |
| } |
| |
| min = VM_EXIT_SAVE_DEBUG_CONTROLS | VM_EXIT_ACK_INTR_ON_EXIT; |
| #ifdef CONFIG_X86_64 |
| min |= VM_EXIT_HOST_ADDR_SPACE_SIZE; |
| #endif |
| opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT | |
| VM_EXIT_CLEAR_BNDCFGS; |
| if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS, |
| &_vmexit_control) < 0) |
| return -EIO; |
| |
| min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING; |
| opt = PIN_BASED_VIRTUAL_NMIS | PIN_BASED_POSTED_INTR | |
| PIN_BASED_VMX_PREEMPTION_TIMER; |
| if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS, |
| &_pin_based_exec_control) < 0) |
| return -EIO; |
| |
| if (cpu_has_broken_vmx_preemption_timer()) |
| _pin_based_exec_control &= ~PIN_BASED_VMX_PREEMPTION_TIMER; |
| if (!(_cpu_based_2nd_exec_control & |
| SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY)) |
| _pin_based_exec_control &= ~PIN_BASED_POSTED_INTR; |
| |
| min = VM_ENTRY_LOAD_DEBUG_CONTROLS; |
| opt = VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_LOAD_BNDCFGS; |
| if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS, |
| &_vmentry_control) < 0) |
| return -EIO; |
| |
| rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high); |
| |
| /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */ |
| if ((vmx_msr_high & 0x1fff) > PAGE_SIZE) |
| return -EIO; |
| |
| #ifdef CONFIG_X86_64 |
| /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */ |
| if (vmx_msr_high & (1u<<16)) |
| return -EIO; |
| #endif |
| |
| /* Require Write-Back (WB) memory type for VMCS accesses. */ |
| if (((vmx_msr_high >> 18) & 15) != 6) |
| return -EIO; |
| |
| vmcs_conf->size = vmx_msr_high & 0x1fff; |
| vmcs_conf->order = get_order(vmcs_conf->size); |
| vmcs_conf->basic_cap = vmx_msr_high & ~0x1fff; |
| |
| vmcs_conf->revision_id = vmx_msr_low; |
| |
| vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control; |
| vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control; |
| vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control; |
| vmcs_conf->vmexit_ctrl = _vmexit_control; |
| vmcs_conf->vmentry_ctrl = _vmentry_control; |
| |
| if (static_branch_unlikely(&enable_evmcs)) |
| evmcs_sanitize_exec_ctrls(vmcs_conf); |
| |
| cpu_has_load_ia32_efer = |
| allow_1_setting(MSR_IA32_VMX_ENTRY_CTLS, |
| VM_ENTRY_LOAD_IA32_EFER) |
| && allow_1_setting(MSR_IA32_VMX_EXIT_CTLS, |
| VM_EXIT_LOAD_IA32_EFER); |
| |
| cpu_has_load_perf_global_ctrl = |
| allow_1_setting(MSR_IA32_VMX_ENTRY_CTLS, |
| VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL) |
| && allow_1_setting(MSR_IA32_VMX_EXIT_CTLS, |
| VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL); |
| |
| /* |
| * Some cpus support VM_ENTRY_(LOAD|SAVE)_IA32_PERF_GLOBAL_CTRL |
| * but due to errata below it can't be used. Workaround is to use |
| * msr load mechanism to switch IA32_PERF_GLOBAL_CTRL. |
| * |
| * VM Exit May Incorrectly Clear IA32_PERF_GLOBAL_CTRL [34:32] |
| * |
| * AAK155 (model 26) |
| * AAP115 (model 30) |
| * AAT100 (model 37) |
| * BC86,AAY89,BD102 (model 44) |
| * BA97 (model 46) |
| * |
| */ |
| if (cpu_has_load_perf_global_ctrl && boot_cpu_data.x86 == 0x6) { |
| switch (boot_cpu_data.x86_model) { |
| case 26: |
| case 30: |
| case 37: |
| case 44: |
| case 46: |
| cpu_has_load_perf_global_ctrl = false; |
| printk_once(KERN_WARNING"kvm: VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL " |
| "does not work properly. Using workaround\n"); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| if (boot_cpu_has(X86_FEATURE_XSAVES)) |
| rdmsrl(MSR_IA32_XSS, host_xss); |
| |
| return 0; |
| } |
| |
| static struct vmcs *alloc_vmcs_cpu(bool shadow, int cpu) |
| { |
| int node = cpu_to_node(cpu); |
| struct page *pages; |
| struct vmcs *vmcs; |
| |
| pages = __alloc_pages_node(node, GFP_KERNEL, vmcs_config.order); |
| if (!pages) |
| return NULL; |
| vmcs = page_address(pages); |
| memset(vmcs, 0, vmcs_config.size); |
| |
| /* KVM supports Enlightened VMCS v1 only */ |
| if (static_branch_unlikely(&enable_evmcs)) |
| vmcs->hdr.revision_id = KVM_EVMCS_VERSION; |
| else |
| vmcs->hdr.revision_id = vmcs_config.revision_id; |
| |
| if (shadow) |
| vmcs->hdr.shadow_vmcs = 1; |
| return vmcs; |
| } |
| |
| static void free_vmcs(struct vmcs *vmcs) |
| { |
| free_pages((unsigned long)vmcs, vmcs_config.order); |
| } |
| |
| /* |
| * Free a VMCS, but before that VMCLEAR it on the CPU where it was last loaded |
| */ |
| static void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs) |
| { |
| if (!loaded_vmcs->vmcs) |
| return; |
| loaded_vmcs_clear(loaded_vmcs); |
| free_vmcs(loaded_vmcs->vmcs); |
| loaded_vmcs->vmcs = NULL; |
| if (loaded_vmcs->msr_bitmap) |
| free_page((unsigned long)loaded_vmcs->msr_bitmap); |
| WARN_ON(loaded_vmcs->shadow_vmcs != NULL); |
| } |
| |
| static struct vmcs *alloc_vmcs(bool shadow) |
| { |
| return alloc_vmcs_cpu(shadow, raw_smp_processor_id()); |
| } |
| |
| static int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs) |
| { |
| loaded_vmcs->vmcs = alloc_vmcs(false); |
| if (!loaded_vmcs->vmcs) |
| return -ENOMEM; |
| |
| loaded_vmcs->shadow_vmcs = NULL; |
| loaded_vmcs_init(loaded_vmcs); |
| |
| if (cpu_has_vmx_msr_bitmap()) { |
| loaded_vmcs->msr_bitmap = (unsigned long *)__get_free_page(GFP_KERNEL); |
| if (!loaded_vmcs->msr_bitmap) |
| goto out_vmcs; |
| memset(loaded_vmcs->msr_bitmap, 0xff, PAGE_SIZE); |
| |
| if (IS_ENABLED(CONFIG_HYPERV) && |
| static_branch_unlikely(&enable_evmcs) && |
| (ms_hyperv.nested_features & HV_X64_NESTED_MSR_BITMAP)) { |
| struct hv_enlightened_vmcs *evmcs = |
| (struct hv_enlightened_vmcs *)loaded_vmcs->vmcs; |
| |
| evmcs->hv_enlightenments_control.msr_bitmap = 1; |
| } |
| } |
| |
| memset(&loaded_vmcs->host_state, 0, sizeof(struct vmcs_host_state)); |
| |
| return 0; |
| |
| out_vmcs: |
| free_loaded_vmcs(loaded_vmcs); |
| return -ENOMEM; |
| } |
| |
| static void free_kvm_area(void) |
| { |
| int cpu; |
| |
| for_each_possible_cpu(cpu) { |
| free_vmcs(per_cpu(vmxarea, cpu)); |
| per_cpu(vmxarea, cpu) = NULL; |
| } |
| } |
| |
| enum vmcs_field_width { |
| VMCS_FIELD_WIDTH_U16 = 0, |
| VMCS_FIELD_WIDTH_U64 = 1, |
| VMCS_FIELD_WIDTH_U32 = 2, |
| VMCS_FIELD_WIDTH_NATURAL_WIDTH = 3 |
| }; |
| |
| static inline int vmcs_field_width(unsigned long field) |
| { |
| if (0x1 & field) /* the *_HIGH fields are all 32 bit */ |
| return VMCS_FIELD_WIDTH_U32; |
| return (field >> 13) & 0x3 ; |
| } |
| |
| static inline int vmcs_field_readonly(unsigned long field) |
| { |
| return (((field >> 10) & 0x3) == 1); |
| } |
| |
| static void init_vmcs_shadow_fields(void) |
| { |
| int i, j; |
| |
| for (i = j = 0; i < max_shadow_read_only_fields; i++) { |
| u16 field = shadow_read_only_fields[i]; |
| if (vmcs_field_width(field) == VMCS_FIELD_WIDTH_U64 && |
| (i + 1 == max_shadow_read_only_fields || |
| shadow_read_only_fields[i + 1] != field + 1)) |
| pr_err("Missing field from shadow_read_only_field %x\n", |
| field + 1); |
| |
| clear_bit(field, vmx_vmread_bitmap); |
| #ifdef CONFIG_X86_64 |
| if (field & 1) |
| continue; |
| #endif |
| if (j < i) |
| shadow_read_only_fields[j] = field; |
| j++; |
| } |
| max_shadow_read_only_fields = j; |
| |
| for (i = j = 0; i < max_shadow_read_write_fields; i++) { |
| u16 field = shadow_read_write_fields[i]; |
| if (vmcs_field_width(field) == VMCS_FIELD_WIDTH_U64 && |
| (i + 1 == max_shadow_read_write_fields || |
| shadow_read_write_fields[i + 1] != field + 1)) |
| pr_err("Missing field from shadow_read_write_field %x\n", |
| field + 1); |
| |
| /* |
| * PML and the preemption timer can be emulated, but the |
| * processor cannot vmwrite to fields that don't exist |
| * on bare metal. |
| */ |
| switch (field) { |
| case GUEST_PML_INDEX: |
| if (!cpu_has_vmx_pml()) |
| continue; |
| break; |
| case VMX_PREEMPTION_TIMER_VALUE: |
| if (!cpu_has_vmx_preemption_timer()) |
| continue; |
| break; |
| case GUEST_INTR_STATUS: |
| if (!cpu_has_vmx_apicv()) |
| continue; |
| break; |
| default: |
| break; |
| } |
| |
| clear_bit(field, vmx_vmwrite_bitmap); |
| clear_bit(field, vmx_vmread_bitmap); |
| #ifdef CONFIG_X86_64 |
| if (field & 1) |
| continue; |
| #endif |
| if (j < i) |
| shadow_read_write_fields[j] = field; |
| j++; |
| } |
| max_shadow_read_write_fields = j; |
| } |
| |
| static __init int alloc_kvm_area(void) |
| { |
| int cpu; |
| |
| for_each_possible_cpu(cpu) { |
| struct vmcs *vmcs; |
| |
| vmcs = alloc_vmcs_cpu(false, cpu); |
| if (!vmcs) { |
| free_kvm_area(); |
| return -ENOMEM; |
| } |
| |
| /* |
| * When eVMCS is enabled, alloc_vmcs_cpu() sets |
| * vmcs->revision_id to KVM_EVMCS_VERSION instead of |
| * revision_id reported by MSR_IA32_VMX_BASIC. |
| * |
| * However, even though not explictly documented by |
| * TLFS, VMXArea passed as VMXON argument should |
| * still be marked with revision_id reported by |
| * physical CPU. |
| */ |
| if (static_branch_unlikely(&enable_evmcs)) |
| vmcs->hdr.revision_id = vmcs_config.revision_id; |
| |
| per_cpu(vmxarea, cpu) = vmcs; |
| } |
| return 0; |
| } |
| |
| static void fix_pmode_seg(struct kvm_vcpu *vcpu, int seg, |
| struct kvm_segment *save) |
| { |
| if (!emulate_invalid_guest_state) { |
| /* |
| * CS and SS RPL should be equal during guest entry according |
| * to VMX spec, but in reality it is not always so. Since vcpu |
| * is in the middle of the transition from real mode to |
| * protected mode it is safe to assume that RPL 0 is a good |
| * default value. |
| */ |
| if (seg == VCPU_SREG_CS || seg == VCPU_SREG_SS) |
| save->selector &= ~SEGMENT_RPL_MASK; |
| save->dpl = save->selector & SEGMENT_RPL_MASK; |
| save->s = 1; |
| } |
| vmx_set_segment(vcpu, save, seg); |
| } |
| |
| static void enter_pmode(struct kvm_vcpu *vcpu) |
| { |
| unsigned long flags; |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| /* |
| * Update real mode segment cache. It may be not up-to-date if sement |
| * register was written while vcpu was in a guest mode. |
| */ |
| vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_ES], VCPU_SREG_ES); |
| vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_DS], VCPU_SREG_DS); |
| vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_FS], VCPU_SREG_FS); |
| vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_GS], VCPU_SREG_GS); |
| vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_SS], VCPU_SREG_SS); |
| vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_CS], VCPU_SREG_CS); |
| |
| vmx->rmode.vm86_active = 0; |
| |
| vmx_segment_cache_clear(vmx); |
| |
| vmx_set_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_TR], VCPU_SREG_TR); |
| |
| flags = vmcs_readl(GUEST_RFLAGS); |
| flags &= RMODE_GUEST_OWNED_EFLAGS_BITS; |
| flags |= vmx->rmode.save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS; |
| vmcs_writel(GUEST_RFLAGS, flags); |
| |
| vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) | |
| (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME)); |
| |
| update_exception_bitmap(vcpu); |
| |
| fix_pmode_seg(vcpu, VCPU_SREG_CS, &vmx->rmode.segs[VCPU_SREG_CS]); |
| fix_pmode_seg(vcpu, VCPU_SREG_SS, &vmx->rmode.segs[VCPU_SREG_SS]); |
| fix_pmode_seg(vcpu, VCPU_SREG_ES, &vmx->rmode.segs[VCPU_SREG_ES]); |
| fix_pmode_seg(vcpu, VCPU_SREG_DS, &vmx->rmode.segs[VCPU_SREG_DS]); |
| fix_pmode_seg(vcpu, VCPU_SREG_FS, &vmx->rmode.segs[VCPU_SREG_FS]); |
| fix_pmode_seg(vcpu, VCPU_SREG_GS, &vmx->rmode.segs[VCPU_SREG_GS]); |
| } |
| |
| static void fix_rmode_seg(int seg, struct kvm_segment *save) |
| { |
| const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; |
| struct kvm_segment var = *save; |
| |
| var.dpl = 0x3; |
| if (seg == VCPU_SREG_CS) |
| var.type = 0x3; |
| |
| if (!emulate_invalid_guest_state) { |
| var.selector = var.base >> 4; |
| var.base = var.base & 0xffff0; |
| var.limit = 0xffff; |
| var.g = 0; |
| var.db = 0; |
| var.present = 1; |
| var.s = 1; |
| var.l = 0; |
| var.unusable = 0; |
| var.type = 0x3; |
| var.avl = 0; |
| if (save->base & 0xf) |
| printk_once(KERN_WARNING "kvm: segment base is not " |
| "paragraph aligned when entering " |
| "protected mode (seg=%d)", seg); |
| } |
| |
| vmcs_write16(sf->selector, var.selector); |
| vmcs_writel(sf->base, var.base); |
| vmcs_write32(sf->limit, var.limit); |
| vmcs_write32(sf->ar_bytes, vmx_segment_access_rights(&var)); |
| } |
| |
| static void enter_rmode(struct kvm_vcpu *vcpu) |
| { |
| unsigned long flags; |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct kvm_vmx *kvm_vmx = to_kvm_vmx(vcpu->kvm); |
| |
| vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_TR], VCPU_SREG_TR); |
| vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_ES], VCPU_SREG_ES); |
| vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_DS], VCPU_SREG_DS); |
| vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_FS], VCPU_SREG_FS); |
| vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_GS], VCPU_SREG_GS); |
| vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_SS], VCPU_SREG_SS); |
| vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_CS], VCPU_SREG_CS); |
| |
| vmx->rmode.vm86_active = 1; |
| |
| /* |
| * Very old userspace does not call KVM_SET_TSS_ADDR before entering |
| * vcpu. Warn the user that an update is overdue. |
| */ |
| if (!kvm_vmx->tss_addr) |
| printk_once(KERN_WARNING "kvm: KVM_SET_TSS_ADDR need to be " |
| "called before entering vcpu\n"); |
| |
| vmx_segment_cache_clear(vmx); |
| |
| vmcs_writel(GUEST_TR_BASE, kvm_vmx->tss_addr); |
| vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1); |
| vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); |
| |
| flags = vmcs_readl(GUEST_RFLAGS); |
| vmx->rmode.save_rflags = flags; |
| |
| flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM; |
| |
| vmcs_writel(GUEST_RFLAGS, flags); |
| vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME); |
| update_exception_bitmap(vcpu); |
| |
| fix_rmode_seg(VCPU_SREG_SS, &vmx->rmode.segs[VCPU_SREG_SS]); |
| fix_rmode_seg(VCPU_SREG_CS, &vmx->rmode.segs[VCPU_SREG_CS]); |
| fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.segs[VCPU_SREG_ES]); |
| fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.segs[VCPU_SREG_DS]); |
| fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.segs[VCPU_SREG_GS]); |
| fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.segs[VCPU_SREG_FS]); |
| |
| kvm_mmu_reset_context(vcpu); |
| } |
| |
| static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct shared_msr_entry *msr = find_msr_entry(vmx, MSR_EFER); |
| |
| if (!msr) |
| return; |
| |
| vcpu->arch.efer = efer; |
| if (efer & EFER_LMA) { |
| vm_entry_controls_setbit(to_vmx(vcpu), VM_ENTRY_IA32E_MODE); |
| msr->data = efer; |
| } else { |
| vm_entry_controls_clearbit(to_vmx(vcpu), VM_ENTRY_IA32E_MODE); |
| |
| msr->data = efer & ~EFER_LME; |
| } |
| setup_msrs(vmx); |
| } |
| |
| #ifdef CONFIG_X86_64 |
| |
| static void enter_lmode(struct kvm_vcpu *vcpu) |
| { |
| u32 guest_tr_ar; |
| |
| vmx_segment_cache_clear(to_vmx(vcpu)); |
| |
| guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES); |
| if ((guest_tr_ar & VMX_AR_TYPE_MASK) != VMX_AR_TYPE_BUSY_64_TSS) { |
| pr_debug_ratelimited("%s: tss fixup for long mode. \n", |
| __func__); |
| vmcs_write32(GUEST_TR_AR_BYTES, |
| (guest_tr_ar & ~VMX_AR_TYPE_MASK) |
| | VMX_AR_TYPE_BUSY_64_TSS); |
| } |
| vmx_set_efer(vcpu, vcpu->arch.efer | EFER_LMA); |
| } |
| |
| static void exit_lmode(struct kvm_vcpu *vcpu) |
| { |
| vm_entry_controls_clearbit(to_vmx(vcpu), VM_ENTRY_IA32E_MODE); |
| vmx_set_efer(vcpu, vcpu->arch.efer & ~EFER_LMA); |
| } |
| |
| #endif |
| |
| static inline void __vmx_flush_tlb(struct kvm_vcpu *vcpu, int vpid, |
| bool invalidate_gpa) |
| { |
| if (enable_ept && (invalidate_gpa || !enable_vpid)) { |
| if (!VALID_PAGE(vcpu->arch.mmu->root_hpa)) |
| return; |
| ept_sync_context(construct_eptp(vcpu, |
| vcpu->arch.mmu->root_hpa)); |
| } else { |
| vpid_sync_context(vpid); |
| } |
| } |
| |
| static void vmx_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa) |
| { |
| __vmx_flush_tlb(vcpu, to_vmx(vcpu)->vpid, invalidate_gpa); |
| } |
| |
| static void vmx_flush_tlb_gva(struct kvm_vcpu *vcpu, gva_t addr) |
| { |
| int vpid = to_vmx(vcpu)->vpid; |
| |
| if (!vpid_sync_vcpu_addr(vpid, addr)) |
| vpid_sync_context(vpid); |
| |
| /* |
| * If VPIDs are not supported or enabled, then the above is a no-op. |
| * But we don't really need a TLB flush in that case anyway, because |
| * each VM entry/exit includes an implicit flush when VPID is 0. |
| */ |
| } |
| |
| static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu) |
| { |
| ulong cr0_guest_owned_bits = vcpu->arch.cr0_guest_owned_bits; |
| |
| vcpu->arch.cr0 &= ~cr0_guest_owned_bits; |
| vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & cr0_guest_owned_bits; |
| } |
| |
| static void vmx_decache_cr3(struct kvm_vcpu *vcpu) |
| { |
| if (enable_unrestricted_guest || (enable_ept && is_paging(vcpu))) |
| vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); |
| __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); |
| } |
| |
| static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu) |
| { |
| ulong cr4_guest_owned_bits = vcpu->arch.cr4_guest_owned_bits; |
| |
| vcpu->arch.cr4 &= ~cr4_guest_owned_bits; |
| vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & cr4_guest_owned_bits; |
| } |
| |
| static void ept_load_pdptrs(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_mmu *mmu = vcpu->arch.walk_mmu; |
| |
| if (!test_bit(VCPU_EXREG_PDPTR, |
| (unsigned long *)&vcpu->arch.regs_dirty)) |
| return; |
| |
| if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) { |
| vmcs_write64(GUEST_PDPTR0, mmu->pdptrs[0]); |
| vmcs_write64(GUEST_PDPTR1, mmu->pdptrs[1]); |
| vmcs_write64(GUEST_PDPTR2, mmu->pdptrs[2]); |
| vmcs_write64(GUEST_PDPTR3, mmu->pdptrs[3]); |
| } |
| } |
| |
| static void ept_save_pdptrs(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_mmu *mmu = vcpu->arch.walk_mmu; |
| |
| if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) { |
| mmu->pdptrs[0] = vmcs_read64(GUEST_PDPTR0); |
| mmu->pdptrs[1] = vmcs_read64(GUEST_PDPTR1); |
| mmu->pdptrs[2] = vmcs_read64(GUEST_PDPTR2); |
| mmu->pdptrs[3] = vmcs_read64(GUEST_PDPTR3); |
| } |
| |
| __set_bit(VCPU_EXREG_PDPTR, |
| (unsigned long *)&vcpu->arch.regs_avail); |
| __set_bit(VCPU_EXREG_PDPTR, |
| (unsigned long *)&vcpu->arch.regs_dirty); |
| } |
| |
| static bool nested_guest_cr0_valid(struct kvm_vcpu *vcpu, unsigned long val) |
| { |
| u64 fixed0 = to_vmx(vcpu)->nested.msrs.cr0_fixed0; |
| u64 fixed1 = to_vmx(vcpu)->nested.msrs.cr0_fixed1; |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| |
| if (to_vmx(vcpu)->nested.msrs.secondary_ctls_high & |
| SECONDARY_EXEC_UNRESTRICTED_GUEST && |
| nested_cpu_has2(vmcs12, SECONDARY_EXEC_UNRESTRICTED_GUEST)) |
| fixed0 &= ~(X86_CR0_PE | X86_CR0_PG); |
| |
| return fixed_bits_valid(val, fixed0, fixed1); |
| } |
| |
| static bool nested_host_cr0_valid(struct kvm_vcpu *vcpu, unsigned long val) |
| { |
| u64 fixed0 = to_vmx(vcpu)->nested.msrs.cr0_fixed0; |
| u64 fixed1 = to_vmx(vcpu)->nested.msrs.cr0_fixed1; |
| |
| return fixed_bits_valid(val, fixed0, fixed1); |
| } |
| |
| static bool nested_cr4_valid(struct kvm_vcpu *vcpu, unsigned long val) |
| { |
| u64 fixed0 = to_vmx(vcpu)->nested.msrs.cr4_fixed0; |
| u64 fixed1 = to_vmx(vcpu)->nested.msrs.cr4_fixed1; |
| |
| return fixed_bits_valid(val, fixed0, fixed1); |
| } |
| |
| /* No difference in the restrictions on guest and host CR4 in VMX operation. */ |
| #define nested_guest_cr4_valid nested_cr4_valid |
| #define nested_host_cr4_valid nested_cr4_valid |
| |
| static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4); |
| |
| static void ept_update_paging_mode_cr0(unsigned long *hw_cr0, |
| unsigned long cr0, |
| struct kvm_vcpu *vcpu) |
| { |
| if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail)) |
| vmx_decache_cr3(vcpu); |
| if (!(cr0 & X86_CR0_PG)) { |
| /* From paging/starting to nonpaging */ |
| vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, |
| vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) | |
| (CPU_BASED_CR3_LOAD_EXITING | |
| CPU_BASED_CR3_STORE_EXITING)); |
| vcpu->arch.cr0 = cr0; |
| vmx_set_cr4(vcpu, kvm_read_cr4(vcpu)); |
| } else if (!is_paging(vcpu)) { |
| /* From nonpaging to paging */ |
| vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, |
| vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) & |
| ~(CPU_BASED_CR3_LOAD_EXITING | |
| CPU_BASED_CR3_STORE_EXITING)); |
| vcpu->arch.cr0 = cr0; |
| vmx_set_cr4(vcpu, kvm_read_cr4(vcpu)); |
| } |
| |
| if (!(cr0 & X86_CR0_WP)) |
| *hw_cr0 &= ~X86_CR0_WP; |
| } |
| |
| static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| unsigned long hw_cr0; |
| |
| hw_cr0 = (cr0 & ~KVM_VM_CR0_ALWAYS_OFF); |
| if (enable_unrestricted_guest) |
| hw_cr0 |= KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST; |
| else { |
| hw_cr0 |= KVM_VM_CR0_ALWAYS_ON; |
| |
| if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE)) |
| enter_pmode(vcpu); |
| |
| if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE)) |
| enter_rmode(vcpu); |
| } |
| |
| #ifdef CONFIG_X86_64 |
| if (vcpu->arch.efer & EFER_LME) { |
| if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) |
| enter_lmode(vcpu); |
| if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) |
| exit_lmode(vcpu); |
| } |
| #endif |
| |
| if (enable_ept && !enable_unrestricted_guest) |
| ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu); |
| |
| vmcs_writel(CR0_READ_SHADOW, cr0); |
| vmcs_writel(GUEST_CR0, hw_cr0); |
| vcpu->arch.cr0 = cr0; |
| |
| /* depends on vcpu->arch.cr0 to be set to a new value */ |
| vmx->emulation_required = emulation_required(vcpu); |
| } |
| |
| static int get_ept_level(struct kvm_vcpu *vcpu) |
| { |
| if (cpu_has_vmx_ept_5levels() && (cpuid_maxphyaddr(vcpu) > 48)) |
| return 5; |
| return 4; |
| } |
| |
| static u64 construct_eptp(struct kvm_vcpu *vcpu, unsigned long root_hpa) |
| { |
| u64 eptp = VMX_EPTP_MT_WB; |
| |
| eptp |= (get_ept_level(vcpu) == 5) ? VMX_EPTP_PWL_5 : VMX_EPTP_PWL_4; |
| |
| if (enable_ept_ad_bits && |
| (!is_guest_mode(vcpu) || nested_ept_ad_enabled(vcpu))) |
| eptp |= VMX_EPTP_AD_ENABLE_BIT; |
| eptp |= (root_hpa & PAGE_MASK); |
| |
| return eptp; |
| } |
| |
| static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) |
| { |
| struct kvm *kvm = vcpu->kvm; |
| unsigned long guest_cr3; |
| u64 eptp; |
| |
| guest_cr3 = cr3; |
| if (enable_ept) { |
| eptp = construct_eptp(vcpu, cr3); |
| vmcs_write64(EPT_POINTER, eptp); |
| |
| if (kvm_x86_ops->tlb_remote_flush) { |
| spin_lock(&to_kvm_vmx(kvm)->ept_pointer_lock); |
| to_vmx(vcpu)->ept_pointer = eptp; |
| to_kvm_vmx(kvm)->ept_pointers_match |
| = EPT_POINTERS_CHECK; |
| spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock); |
| } |
| |
| if (enable_unrestricted_guest || is_paging(vcpu) || |
| is_guest_mode(vcpu)) |
| guest_cr3 = kvm_read_cr3(vcpu); |
| else |
| guest_cr3 = to_kvm_vmx(kvm)->ept_identity_map_addr; |
| ept_load_pdptrs(vcpu); |
| } |
| |
| vmcs_writel(GUEST_CR3, guest_cr3); |
| } |
| |
| static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) |
| { |
| /* |
| * Pass through host's Machine Check Enable value to hw_cr4, which |
| * is in force while we are in guest mode. Do not let guests control |
| * this bit, even if host CR4.MCE == 0. |
| */ |
| unsigned long hw_cr4; |
| |
| hw_cr4 = (cr4_read_shadow() & X86_CR4_MCE) | (cr4 & ~X86_CR4_MCE); |
| if (enable_unrestricted_guest) |
| hw_cr4 |= KVM_VM_CR4_ALWAYS_ON_UNRESTRICTED_GUEST; |
| else if (to_vmx(vcpu)->rmode.vm86_active) |
| hw_cr4 |= KVM_RMODE_VM_CR4_ALWAYS_ON; |
| else |
| hw_cr4 |= KVM_PMODE_VM_CR4_ALWAYS_ON; |
| |
| if (!boot_cpu_has(X86_FEATURE_UMIP) && vmx_umip_emulated()) { |
| if (cr4 & X86_CR4_UMIP) { |
| vmcs_set_bits(SECONDARY_VM_EXEC_CONTROL, |
| SECONDARY_EXEC_DESC); |
| hw_cr4 &= ~X86_CR4_UMIP; |
| } else if (!is_guest_mode(vcpu) || |
| !nested_cpu_has2(get_vmcs12(vcpu), SECONDARY_EXEC_DESC)) |
| vmcs_clear_bits(SECONDARY_VM_EXEC_CONTROL, |
| SECONDARY_EXEC_DESC); |
| } |
| |
| if (cr4 & X86_CR4_VMXE) { |
| /* |
| * To use VMXON (and later other VMX instructions), a guest |
| * must first be able to turn on cr4.VMXE (see handle_vmon()). |
| * So basically the check on whether to allow nested VMX |
| * is here. We operate under the default treatment of SMM, |
| * so VMX cannot be enabled under SMM. |
| */ |
| if (!nested_vmx_allowed(vcpu) || is_smm(vcpu)) |
| return 1; |
| } |
| |
| if (to_vmx(vcpu)->nested.vmxon && !nested_cr4_valid(vcpu, cr4)) |
| return 1; |
| |
| vcpu->arch.cr4 = cr4; |
| |
| if (!enable_unrestricted_guest) { |
| if (enable_ept) { |
| if (!is_paging(vcpu)) { |
| hw_cr4 &= ~X86_CR4_PAE; |
| hw_cr4 |= X86_CR4_PSE; |
| } else if (!(cr4 & X86_CR4_PAE)) { |
| hw_cr4 &= ~X86_CR4_PAE; |
| } |
| } |
| |
| /* |
| * SMEP/SMAP/PKU is disabled if CPU is in non-paging mode in |
| * hardware. To emulate this behavior, SMEP/SMAP/PKU needs |
| * to be manually disabled when guest switches to non-paging |
| * mode. |
| * |
| * If !enable_unrestricted_guest, the CPU is always running |
| * with CR0.PG=1 and CR4 needs to be modified. |
| * If enable_unrestricted_guest, the CPU automatically |
| * disables SMEP/SMAP/PKU when the guest sets CR0.PG=0. |
| */ |
| if (!is_paging(vcpu)) |
| hw_cr4 &= ~(X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_PKE); |
| } |
| |
| vmcs_writel(CR4_READ_SHADOW, cr4); |
| vmcs_writel(GUEST_CR4, hw_cr4); |
| return 0; |
| } |
| |
| static void vmx_get_segment(struct kvm_vcpu *vcpu, |
| struct kvm_segment *var, int seg) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| u32 ar; |
| |
| if (vmx->rmode.vm86_active && seg != VCPU_SREG_LDTR) { |
| *var = vmx->rmode.segs[seg]; |
| if (seg == VCPU_SREG_TR |
| || var->selector == vmx_read_guest_seg_selector(vmx, seg)) |
| return; |
| var->base = vmx_read_guest_seg_base(vmx, seg); |
| var->selector = vmx_read_guest_seg_selector(vmx, seg); |
| return; |
| } |
| var->base = vmx_read_guest_seg_base(vmx, seg); |
| var->limit = vmx_read_guest_seg_limit(vmx, seg); |
| var->selector = vmx_read_guest_seg_selector(vmx, seg); |
| ar = vmx_read_guest_seg_ar(vmx, seg); |
| var->unusable = (ar >> 16) & 1; |
| var->type = ar & 15; |
| var->s = (ar >> 4) & 1; |
| var->dpl = (ar >> 5) & 3; |
| /* |
| * Some userspaces do not preserve unusable property. Since usable |
| * segment has to be present according to VMX spec we can use present |
| * property to amend userspace bug by making unusable segment always |
| * nonpresent. vmx_segment_access_rights() already marks nonpresent |
| * segment as unusable. |
| */ |
| var->present = !var->unusable; |
| var->avl = (ar >> 12) & 1; |
| var->l = (ar >> 13) & 1; |
| var->db = (ar >> 14) & 1; |
| var->g = (ar >> 15) & 1; |
| } |
| |
| static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg) |
| { |
| struct kvm_segment s; |
| |
| if (to_vmx(vcpu)->rmode.vm86_active) { |
| vmx_get_segment(vcpu, &s, seg); |
| return s.base; |
| } |
| return vmx_read_guest_seg_base(to_vmx(vcpu), seg); |
| } |
| |
| static int vmx_get_cpl(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| if (unlikely(vmx->rmode.vm86_active)) |
| return 0; |
| else { |
| int ar = vmx_read_guest_seg_ar(vmx, VCPU_SREG_SS); |
| return VMX_AR_DPL(ar); |
| } |
| } |
| |
| static u32 vmx_segment_access_rights(struct kvm_segment *var) |
| { |
| u32 ar; |
| |
| if (var->unusable || !var->present) |
| ar = 1 << 16; |
| else { |
| ar = var->type & 15; |
| ar |= (var->s & 1) << 4; |
| ar |= (var->dpl & 3) << 5; |
| ar |= (var->present & 1) << 7; |
| ar |= (var->avl & 1) << 12; |
| ar |= (var->l & 1) << 13; |
| ar |= (var->db & 1) << 14; |
| ar |= (var->g & 1) << 15; |
| } |
| |
| return ar; |
| } |
| |
| static void vmx_set_segment(struct kvm_vcpu *vcpu, |
| struct kvm_segment *var, int seg) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; |
| |
| vmx_segment_cache_clear(vmx); |
| |
| if (vmx->rmode.vm86_active && seg != VCPU_SREG_LDTR) { |
| vmx->rmode.segs[seg] = *var; |
| if (seg == VCPU_SREG_TR) |
| vmcs_write16(sf->selector, var->selector); |
| else if (var->s) |
| fix_rmode_seg(seg, &vmx->rmode.segs[seg]); |
| goto out; |
| } |
| |
| vmcs_writel(sf->base, var->base); |
| vmcs_write32(sf->limit, var->limit); |
| vmcs_write16(sf->selector, var->selector); |
| |
| /* |
| * Fix the "Accessed" bit in AR field of segment registers for older |
| * qemu binaries. |
| * IA32 arch specifies that at the time of processor reset the |
| * "Accessed" bit in the AR field of segment registers is 1. And qemu |
| * is setting it to 0 in the userland code. This causes invalid guest |
| * state vmexit when "unrestricted guest" mode is turned on. |
| * Fix for this setup issue in cpu_reset is being pushed in the qemu |
| * tree. Newer qemu binaries with that qemu fix would not need this |
| * kvm hack. |
| */ |
| if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR)) |
| var->type |= 0x1; /* Accessed */ |
| |
| vmcs_write32(sf->ar_bytes, vmx_segment_access_rights(var)); |
| |
| out: |
| vmx->emulation_required = emulation_required(vcpu); |
| } |
| |
| static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) |
| { |
| u32 ar = vmx_read_guest_seg_ar(to_vmx(vcpu), VCPU_SREG_CS); |
| |
| *db = (ar >> 14) & 1; |
| *l = (ar >> 13) & 1; |
| } |
| |
| static void vmx_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) |
| { |
| dt->size = vmcs_read32(GUEST_IDTR_LIMIT); |
| dt->address = vmcs_readl(GUEST_IDTR_BASE); |
| } |
| |
| static void vmx_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) |
| { |
| vmcs_write32(GUEST_IDTR_LIMIT, dt->size); |
| vmcs_writel(GUEST_IDTR_BASE, dt->address); |
| } |
| |
| static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) |
| { |
| dt->size = vmcs_read32(GUEST_GDTR_LIMIT); |
| dt->address = vmcs_readl(GUEST_GDTR_BASE); |
| } |
| |
| static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) |
| { |
| vmcs_write32(GUEST_GDTR_LIMIT, dt->size); |
| vmcs_writel(GUEST_GDTR_BASE, dt->address); |
| } |
| |
| static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg) |
| { |
| struct kvm_segment var; |
| u32 ar; |
| |
| vmx_get_segment(vcpu, &var, seg); |
| var.dpl = 0x3; |
| if (seg == VCPU_SREG_CS) |
| var.type = 0x3; |
| ar = vmx_segment_access_rights(&var); |
| |
| if (var.base != (var.selector << 4)) |
| return false; |
| if (var.limit != 0xffff) |
| return false; |
| if (ar != 0xf3) |
| return false; |
| |
| return true; |
| } |
| |
| static bool code_segment_valid(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_segment cs; |
| unsigned int cs_rpl; |
| |
| vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); |
| cs_rpl = cs.selector & SEGMENT_RPL_MASK; |
| |
| if (cs.unusable) |
| return false; |
| if (~cs.type & (VMX_AR_TYPE_CODE_MASK|VMX_AR_TYPE_ACCESSES_MASK)) |
| return false; |
| if (!cs.s) |
| return false; |
| if (cs.type & VMX_AR_TYPE_WRITEABLE_MASK) { |
| if (cs.dpl > cs_rpl) |
| return false; |
| } else { |
| if (cs.dpl != cs_rpl) |
| return false; |
| } |
| if (!cs.present) |
| return false; |
| |
| /* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */ |
| return true; |
| } |
| |
| static bool stack_segment_valid(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_segment ss; |
| unsigned int ss_rpl; |
| |
| vmx_get_segment(vcpu, &ss, VCPU_SREG_SS); |
| ss_rpl = ss.selector & SEGMENT_RPL_MASK; |
| |
| if (ss.unusable) |
| return true; |
| if (ss.type != 3 && ss.type != 7) |
| return false; |
| if (!ss.s) |
| return false; |
| if (ss.dpl != ss_rpl) /* DPL != RPL */ |
| return false; |
| if (!ss.present) |
| return false; |
| |
| return true; |
| } |
| |
| static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg) |
| { |
| struct kvm_segment var; |
| unsigned int rpl; |
| |
| vmx_get_segment(vcpu, &var, seg); |
| rpl = var.selector & SEGMENT_RPL_MASK; |
| |
| if (var.unusable) |
| return true; |
| if (!var.s) |
| return false; |
| if (!var.present) |
| return false; |
| if (~var.type & (VMX_AR_TYPE_CODE_MASK|VMX_AR_TYPE_WRITEABLE_MASK)) { |
| if (var.dpl < rpl) /* DPL < RPL */ |
| return false; |
| } |
| |
| /* TODO: Add other members to kvm_segment_field to allow checking for other access |
| * rights flags |
| */ |
| return true; |
| } |
| |
| static bool tr_valid(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_segment tr; |
| |
| vmx_get_segment(vcpu, &tr, VCPU_SREG_TR); |
| |
| if (tr.unusable) |
| return false; |
| if (tr.selector & SEGMENT_TI_MASK) /* TI = 1 */ |
| return false; |
| if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */ |
| return false; |
| if (!tr.present) |
| return false; |
| |
| return true; |
| } |
| |
| static bool ldtr_valid(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_segment ldtr; |
| |
| vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR); |
| |
| if (ldtr.unusable) |
| return true; |
| if (ldtr.selector & SEGMENT_TI_MASK) /* TI = 1 */ |
| return false; |
| if (ldtr.type != 2) |
| return false; |
| if (!ldtr.present) |
| return false; |
| |
| return true; |
| } |
| |
| static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_segment cs, ss; |
| |
| vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); |
| vmx_get_segment(vcpu, &ss, VCPU_SREG_SS); |
| |
| return ((cs.selector & SEGMENT_RPL_MASK) == |
| (ss.selector & SEGMENT_RPL_MASK)); |
| } |
| |
| /* |
| * Check if guest state is valid. Returns true if valid, false if |
| * not. |
| * We assume that registers are always usable |
| */ |
| static bool guest_state_valid(struct kvm_vcpu *vcpu) |
| { |
| if (enable_unrestricted_guest) |
| return true; |
| |
| /* real mode guest state checks */ |
| if (!is_protmode(vcpu) || (vmx_get_rflags(vcpu) & X86_EFLAGS_VM)) { |
| if (!rmode_segment_valid(vcpu, VCPU_SREG_CS)) |
| return false; |
| if (!rmode_segment_valid(vcpu, VCPU_SREG_SS)) |
| return false; |
| if (!rmode_segment_valid(vcpu, VCPU_SREG_DS)) |
| return false; |
| if (!rmode_segment_valid(vcpu, VCPU_SREG_ES)) |
| return false; |
| if (!rmode_segment_valid(vcpu, VCPU_SREG_FS)) |
| return false; |
| if (!rmode_segment_valid(vcpu, VCPU_SREG_GS)) |
| return false; |
| } else { |
| /* protected mode guest state checks */ |
| if (!cs_ss_rpl_check(vcpu)) |
| return false; |
| if (!code_segment_valid(vcpu)) |
| return false; |
| if (!stack_segment_valid(vcpu)) |
| return false; |
| if (!data_segment_valid(vcpu, VCPU_SREG_DS)) |
| return false; |
| if (!data_segment_valid(vcpu, VCPU_SREG_ES)) |
| return false; |
| if (!data_segment_valid(vcpu, VCPU_SREG_FS)) |
| return false; |
| if (!data_segment_valid(vcpu, VCPU_SREG_GS)) |
| return false; |
| if (!tr_valid(vcpu)) |
| return false; |
| if (!ldtr_valid(vcpu)) |
| return false; |
| } |
| /* TODO: |
| * - Add checks on RIP |
| * - Add checks on RFLAGS |
| */ |
| |
| return true; |
| } |
| |
| static bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa) |
| { |
| return PAGE_ALIGNED(gpa) && !(gpa >> cpuid_maxphyaddr(vcpu)); |
| } |
| |
| static int init_rmode_tss(struct kvm *kvm) |
| { |
| gfn_t fn; |
| u16 data = 0; |
| int idx, r; |
| |
| idx = srcu_read_lock(&kvm->srcu); |
| fn = to_kvm_vmx(kvm)->tss_addr >> PAGE_SHIFT; |
| r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); |
| if (r < 0) |
| goto out; |
| data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE; |
| r = kvm_write_guest_page(kvm, fn++, &data, |
| TSS_IOPB_BASE_OFFSET, sizeof(u16)); |
| if (r < 0) |
| goto out; |
| r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE); |
| if (r < 0) |
| goto out; |
| r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); |
| if (r < 0) |
| goto out; |
| data = ~0; |
| r = kvm_write_guest_page(kvm, fn, &data, |
| RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1, |
| sizeof(u8)); |
| out: |
| srcu_read_unlock(&kvm->srcu, idx); |
| return r; |
| } |
| |
| static int init_rmode_identity_map(struct kvm *kvm) |
| { |
| struct kvm_vmx *kvm_vmx = to_kvm_vmx(kvm); |
| int i, idx, r = 0; |
| kvm_pfn_t identity_map_pfn; |
| u32 tmp; |
| |
| /* Protect kvm_vmx->ept_identity_pagetable_done. */ |
| mutex_lock(&kvm->slots_lock); |
| |
| if (likely(kvm_vmx->ept_identity_pagetable_done)) |
| goto out2; |
| |
| if (!kvm_vmx->ept_identity_map_addr) |
| kvm_vmx->ept_identity_map_addr = VMX_EPT_IDENTITY_PAGETABLE_ADDR; |
| identity_map_pfn = kvm_vmx->ept_identity_map_addr >> PAGE_SHIFT; |
| |
| r = __x86_set_memory_region(kvm, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT, |
| kvm_vmx->ept_identity_map_addr, PAGE_SIZE); |
| if (r < 0) |
| goto out2; |
| |
| idx = srcu_read_lock(&kvm->srcu); |
| r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE); |
| if (r < 0) |
| goto out; |
| /* Set up identity-mapping pagetable for EPT in real mode */ |
| for (i = 0; i < PT32_ENT_PER_PAGE; i++) { |
| tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | |
| _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE); |
| r = kvm_write_guest_page(kvm, identity_map_pfn, |
| &tmp, i * sizeof(tmp), sizeof(tmp)); |
| if (r < 0) |
| goto out; |
| } |
| kvm_vmx->ept_identity_pagetable_done = true; |
| |
| out: |
| srcu_read_unlock(&kvm->srcu, idx); |
| |
| out2: |
| mutex_unlock(&kvm->slots_lock); |
| return r; |
| } |
| |
| static void seg_setup(int seg) |
| { |
| const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; |
| unsigned int ar; |
| |
| vmcs_write16(sf->selector, 0); |
| vmcs_writel(sf->base, 0); |
| vmcs_write32(sf->limit, 0xffff); |
| ar = 0x93; |
| if (seg == VCPU_SREG_CS) |
| ar |= 0x08; /* code segment */ |
| |
| vmcs_write32(sf->ar_bytes, ar); |
| } |
| |
| static int alloc_apic_access_page(struct kvm *kvm) |
| { |
| struct page *page; |
| int r = 0; |
| |
| mutex_lock(&kvm->slots_lock); |
| if (kvm->arch.apic_access_page_done) |
| goto out; |
| r = __x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT, |
| APIC_DEFAULT_PHYS_BASE, PAGE_SIZE); |
| if (r) |
| goto out; |
| |
| page = gfn_to_page(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT); |
| if (is_error_page(page)) { |
| r = -EFAULT; |
| goto out; |
| } |
| |
| /* |
| * Do not pin the page in memory, so that memory hot-unplug |
| * is able to migrate it. |
| */ |
| put_page(page); |
| kvm->arch.apic_access_page_done = true; |
| out: |
| mutex_unlock(&kvm->slots_lock); |
| return r; |
| } |
| |
| static int allocate_vpid(void) |
| { |
| int vpid; |
| |
| if (!enable_vpid) |
| return 0; |
| spin_lock(&vmx_vpid_lock); |
| vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS); |
| if (vpid < VMX_NR_VPIDS) |
| __set_bit(vpid, vmx_vpid_bitmap); |
| else |
| vpid = 0; |
| spin_unlock(&vmx_vpid_lock); |
| return vpid; |
| } |
| |
| static void free_vpid(int vpid) |
| { |
| if (!enable_vpid || vpid == 0) |
| return; |
| spin_lock(&vmx_vpid_lock); |
| __clear_bit(vpid, vmx_vpid_bitmap); |
| spin_unlock(&vmx_vpid_lock); |
| } |
| |
| static void __always_inline vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, |
| u32 msr, int type) |
| { |
| int f = sizeof(unsigned long); |
| |
| if (!cpu_has_vmx_msr_bitmap()) |
| return; |
| |
| if (static_branch_unlikely(&enable_evmcs)) |
| evmcs_touch_msr_bitmap(); |
| |
| /* |
| * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals |
| * have the write-low and read-high bitmap offsets the wrong way round. |
| * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff. |
| */ |
| if (msr <= 0x1fff) { |
| if (type & MSR_TYPE_R) |
| /* read-low */ |
| __clear_bit(msr, msr_bitmap + 0x000 / f); |
| |
| if (type & MSR_TYPE_W) |
| /* write-low */ |
| __clear_bit(msr, msr_bitmap + 0x800 / f); |
| |
| } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { |
| msr &= 0x1fff; |
| if (type & MSR_TYPE_R) |
| /* read-high */ |
| __clear_bit(msr, msr_bitmap + 0x400 / f); |
| |
| if (type & MSR_TYPE_W) |
| /* write-high */ |
| __clear_bit(msr, msr_bitmap + 0xc00 / f); |
| |
| } |
| } |
| |
| static void __always_inline vmx_enable_intercept_for_msr(unsigned long *msr_bitmap, |
| u32 msr, int type) |
| { |
| int f = sizeof(unsigned long); |
| |
| if (!cpu_has_vmx_msr_bitmap()) |
| return; |
| |
| if (static_branch_unlikely(&enable_evmcs)) |
| evmcs_touch_msr_bitmap(); |
| |
| /* |
| * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals |
| * have the write-low and read-high bitmap offsets the wrong way round. |
| * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff. |
| */ |
| if (msr <= 0x1fff) { |
| if (type & MSR_TYPE_R) |
| /* read-low */ |
| __set_bit(msr, msr_bitmap + 0x000 / f); |
| |
| if (type & MSR_TYPE_W) |
| /* write-low */ |
| __set_bit(msr, msr_bitmap + 0x800 / f); |
| |
| } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { |
| msr &= 0x1fff; |
| if (type & MSR_TYPE_R) |
| /* read-high */ |
| __set_bit(msr, msr_bitmap + 0x400 / f); |
| |
| if (type & MSR_TYPE_W) |
| /* write-high */ |
| __set_bit(msr, msr_bitmap + 0xc00 / f); |
| |
| } |
| } |
| |
| static void __always_inline vmx_set_intercept_for_msr(unsigned long *msr_bitmap, |
| u32 msr, int type, bool value) |
| { |
| if (value) |
| vmx_enable_intercept_for_msr(msr_bitmap, msr, type); |
| else |
| vmx_disable_intercept_for_msr(msr_bitmap, msr, type); |
| } |
| |
| /* |
| * If a msr is allowed by L0, we should check whether it is allowed by L1. |
| * The corresponding bit will be cleared unless both of L0 and L1 allow it. |
| */ |
| static void nested_vmx_disable_intercept_for_msr(unsigned long *msr_bitmap_l1, |
| unsigned long *msr_bitmap_nested, |
| u32 msr, int type) |
| { |
| int f = sizeof(unsigned long); |
| |
| /* |
| * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals |
| * have the write-low and read-high bitmap offsets the wrong way round. |
| * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff. |
| */ |
| if (msr <= 0x1fff) { |
| if (type & MSR_TYPE_R && |
| !test_bit(msr, msr_bitmap_l1 + 0x000 / f)) |
| /* read-low */ |
| __clear_bit(msr, msr_bitmap_nested + 0x000 / f); |
| |
| if (type & MSR_TYPE_W && |
| !test_bit(msr, msr_bitmap_l1 + 0x800 / f)) |
| /* write-low */ |
| __clear_bit(msr, msr_bitmap_nested + 0x800 / f); |
| |
| } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { |
| msr &= 0x1fff; |
| if (type & MSR_TYPE_R && |
| !test_bit(msr, msr_bitmap_l1 + 0x400 / f)) |
| /* read-high */ |
| __clear_bit(msr, msr_bitmap_nested + 0x400 / f); |
| |
| if (type & MSR_TYPE_W && |
| !test_bit(msr, msr_bitmap_l1 + 0xc00 / f)) |
| /* write-high */ |
| __clear_bit(msr, msr_bitmap_nested + 0xc00 / f); |
| |
| } |
| } |
| |
| static u8 vmx_msr_bitmap_mode(struct kvm_vcpu *vcpu) |
| { |
| u8 mode = 0; |
| |
| if (cpu_has_secondary_exec_ctrls() && |
| (vmcs_read32(SECONDARY_VM_EXEC_CONTROL) & |
| SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE)) { |
| mode |= MSR_BITMAP_MODE_X2APIC; |
| if (enable_apicv && kvm_vcpu_apicv_active(vcpu)) |
| mode |= MSR_BITMAP_MODE_X2APIC_APICV; |
| } |
| |
| return mode; |
| } |
| |
| #define X2APIC_MSR(r) (APIC_BASE_MSR + ((r) >> 4)) |
| |
| static void vmx_update_msr_bitmap_x2apic(unsigned long *msr_bitmap, |
| u8 mode) |
| { |
| int msr; |
| |
| for (msr = 0x800; msr <= 0x8ff; msr += BITS_PER_LONG) { |
| unsigned word = msr / BITS_PER_LONG; |
| msr_bitmap[word] = (mode & MSR_BITMAP_MODE_X2APIC_APICV) ? 0 : ~0; |
| msr_bitmap[word + (0x800 / sizeof(long))] = ~0; |
| } |
| |
| if (mode & MSR_BITMAP_MODE_X2APIC) { |
| /* |
| * TPR reads and writes can be virtualized even if virtual interrupt |
| * delivery is not in use. |
| */ |
| vmx_disable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_TASKPRI), MSR_TYPE_RW); |
| if (mode & MSR_BITMAP_MODE_X2APIC_APICV) { |
| vmx_enable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_TMCCT), MSR_TYPE_R); |
| vmx_disable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_EOI), MSR_TYPE_W); |
| vmx_disable_intercept_for_msr(msr_bitmap, X2APIC_MSR(APIC_SELF_IPI), MSR_TYPE_W); |
| } |
| } |
| } |
| |
| static void vmx_update_msr_bitmap(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| unsigned long *msr_bitmap = vmx->vmcs01.msr_bitmap; |
| u8 mode = vmx_msr_bitmap_mode(vcpu); |
| u8 changed = mode ^ vmx->msr_bitmap_mode; |
| |
| if (!changed) |
| return; |
| |
| if (changed & (MSR_BITMAP_MODE_X2APIC | MSR_BITMAP_MODE_X2APIC_APICV)) |
| vmx_update_msr_bitmap_x2apic(msr_bitmap, mode); |
| |
| vmx->msr_bitmap_mode = mode; |
| } |
| |
| static bool vmx_get_enable_apicv(struct kvm_vcpu *vcpu) |
| { |
| return enable_apicv; |
| } |
| |
| static void nested_mark_vmcs12_pages_dirty(struct kvm_vcpu *vcpu) |
| { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| gfn_t gfn; |
| |
| /* |
| * Don't need to mark the APIC access page dirty; it is never |
| * written to by the CPU during APIC virtualization. |
| */ |
| |
| if (nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) { |
| gfn = vmcs12->virtual_apic_page_addr >> PAGE_SHIFT; |
| kvm_vcpu_mark_page_dirty(vcpu, gfn); |
| } |
| |
| if (nested_cpu_has_posted_intr(vmcs12)) { |
| gfn = vmcs12->posted_intr_desc_addr >> PAGE_SHIFT; |
| kvm_vcpu_mark_page_dirty(vcpu, gfn); |
| } |
| } |
| |
| |
| static void vmx_complete_nested_posted_interrupt(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| int max_irr; |
| void *vapic_page; |
| u16 status; |
| |
| if (!vmx->nested.pi_desc || !vmx->nested.pi_pending) |
| return; |
| |
| vmx->nested.pi_pending = false; |
| if (!pi_test_and_clear_on(vmx->nested.pi_desc)) |
| return; |
| |
| max_irr = find_last_bit((unsigned long *)vmx->nested.pi_desc->pir, 256); |
| if (max_irr != 256) { |
| vapic_page = kmap(vmx->nested.virtual_apic_page); |
| __kvm_apic_update_irr(vmx->nested.pi_desc->pir, |
| vapic_page, &max_irr); |
| kunmap(vmx->nested.virtual_apic_page); |
| |
| status = vmcs_read16(GUEST_INTR_STATUS); |
| if ((u8)max_irr > ((u8)status & 0xff)) { |
| status &= ~0xff; |
| status |= (u8)max_irr; |
| vmcs_write16(GUEST_INTR_STATUS, status); |
| } |
| } |
| |
| nested_mark_vmcs12_pages_dirty(vcpu); |
| } |
| |
| static u8 vmx_get_rvi(void) |
| { |
| return vmcs_read16(GUEST_INTR_STATUS) & 0xff; |
| } |
| |
| static bool vmx_guest_apic_has_interrupt(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| void *vapic_page; |
| u32 vppr; |
| int rvi; |
| |
| if (WARN_ON_ONCE(!is_guest_mode(vcpu)) || |
| !nested_cpu_has_vid(get_vmcs12(vcpu)) || |
| WARN_ON_ONCE(!vmx->nested.virtual_apic_page)) |
| return false; |
| |
| rvi = vmx_get_rvi(); |
| |
| vapic_page = kmap(vmx->nested.virtual_apic_page); |
| vppr = *((u32 *)(vapic_page + APIC_PROCPRI)); |
| kunmap(vmx->nested.virtual_apic_page); |
| |
| return ((rvi & 0xf0) > (vppr & 0xf0)); |
| } |
| |
| static inline bool kvm_vcpu_trigger_posted_interrupt(struct kvm_vcpu *vcpu, |
| bool nested) |
| { |
| #ifdef CONFIG_SMP |
| int pi_vec = nested ? POSTED_INTR_NESTED_VECTOR : POSTED_INTR_VECTOR; |
| |
| if (vcpu->mode == IN_GUEST_MODE) { |
| /* |
| * The vector of interrupt to be delivered to vcpu had |
| * been set in PIR before this function. |
| * |
| * Following cases will be reached in this block, and |
| * we always send a notification event in all cases as |
| * explained below. |
| * |
| * Case 1: vcpu keeps in non-root mode. Sending a |
| * notification event posts the interrupt to vcpu. |
| * |
| * Case 2: vcpu exits to root mode and is still |
| * runnable. PIR will be synced to vIRR before the |
| * next vcpu entry. Sending a notification event in |
| * this case has no effect, as vcpu is not in root |
| * mode. |
| * |
| * Case 3: vcpu exits to root mode and is blocked. |
| * vcpu_block() has already synced PIR to vIRR and |
| * never blocks vcpu if vIRR is not cleared. Therefore, |
| * a blocked vcpu here does not wait for any requested |
| * interrupts in PIR, and sending a notification event |
| * which has no effect is safe here. |
| */ |
| |
| apic->send_IPI_mask(get_cpu_mask(vcpu->cpu), pi_vec); |
| return true; |
| } |
| #endif |
| return false; |
| } |
| |
| static int vmx_deliver_nested_posted_interrupt(struct kvm_vcpu *vcpu, |
| int vector) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| if (is_guest_mode(vcpu) && |
| vector == vmx->nested.posted_intr_nv) { |
| /* |
| * If a posted intr is not recognized by hardware, |
| * we will accomplish it in the next vmentry. |
| */ |
| vmx->nested.pi_pending = true; |
| kvm_make_request(KVM_REQ_EVENT, vcpu); |
| /* the PIR and ON have been set by L1. */ |
| if (!kvm_vcpu_trigger_posted_interrupt(vcpu, true)) |
| kvm_vcpu_kick(vcpu); |
| return 0; |
| } |
| return -1; |
| } |
| /* |
| * Send interrupt to vcpu via posted interrupt way. |
| * 1. If target vcpu is running(non-root mode), send posted interrupt |
| * notification to vcpu and hardware will sync PIR to vIRR atomically. |
| * 2. If target vcpu isn't running(root mode), kick it to pick up the |
| * interrupt from PIR in next vmentry. |
| */ |
| static void vmx_deliver_posted_interrupt(struct kvm_vcpu *vcpu, int vector) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| int r; |
| |
| r = vmx_deliver_nested_posted_interrupt(vcpu, vector); |
| if (!r) |
| return; |
| |
| if (pi_test_and_set_pir(vector, &vmx->pi_desc)) |
| return; |
| |
| /* If a previous notification has sent the IPI, nothing to do. */ |
| if (pi_test_and_set_on(&vmx->pi_desc)) |
| return; |
| |
| if (!kvm_vcpu_trigger_posted_interrupt(vcpu, false)) |
| kvm_vcpu_kick(vcpu); |
| } |
| |
| /* |
| * Set up the vmcs's constant host-state fields, i.e., host-state fields that |
| * will not change in the lifetime of the guest. |
| * Note that host-state that does change is set elsewhere. E.g., host-state |
| * that is set differently for each CPU is set in vmx_vcpu_load(), not here. |
| */ |
| static void vmx_set_constant_host_state(struct vcpu_vmx *vmx) |
| { |
| u32 low32, high32; |
| unsigned long tmpl; |
| struct desc_ptr dt; |
| unsigned long cr0, cr3, cr4; |
| |
| cr0 = read_cr0(); |
| WARN_ON(cr0 & X86_CR0_TS); |
| vmcs_writel(HOST_CR0, cr0); /* 22.2.3 */ |
| |
| /* |
| * Save the most likely value for this task's CR3 in the VMCS. |
| * We can't use __get_current_cr3_fast() because we're not atomic. |
| */ |
| cr3 = __read_cr3(); |
| vmcs_writel(HOST_CR3, cr3); /* 22.2.3 FIXME: shadow tables */ |
| vmx->loaded_vmcs->host_state.cr3 = cr3; |
| |
| /* Save the most likely value for this task's CR4 in the VMCS. */ |
| cr4 = cr4_read_shadow(); |
| vmcs_writel(HOST_CR4, cr4); /* 22.2.3, 22.2.5 */ |
| vmx->loaded_vmcs->host_state.cr4 = cr4; |
| |
| vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */ |
| #ifdef CONFIG_X86_64 |
| /* |
| * Load null selectors, so we can avoid reloading them in |
| * vmx_prepare_switch_to_host(), in case userspace uses |
| * the null selectors too (the expected case). |
| */ |
| vmcs_write16(HOST_DS_SELECTOR, 0); |
| vmcs_write16(HOST_ES_SELECTOR, 0); |
| #else |
| vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */ |
| vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */ |
| #endif |
| vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */ |
| vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */ |
| |
| store_idt(&dt); |
| vmcs_writel(HOST_IDTR_BASE, dt.address); /* 22.2.4 */ |
| vmx->host_idt_base = dt.address; |
| |
| vmcs_writel(HOST_RIP, vmx_return); /* 22.2.5 */ |
| |
| rdmsr(MSR_IA32_SYSENTER_CS, low32, high32); |
| vmcs_write32(HOST_IA32_SYSENTER_CS, low32); |
| rdmsrl(MSR_IA32_SYSENTER_EIP, tmpl); |
| vmcs_writel(HOST_IA32_SYSENTER_EIP, tmpl); /* 22.2.3 */ |
| |
| if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) { |
| rdmsr(MSR_IA32_CR_PAT, low32, high32); |
| vmcs_write64(HOST_IA32_PAT, low32 | ((u64) high32 << 32)); |
| } |
| |
| if (cpu_has_load_ia32_efer) |
| vmcs_write64(HOST_IA32_EFER, host_efer); |
| } |
| |
| static void set_cr4_guest_host_mask(struct vcpu_vmx *vmx) |
| { |
| vmx->vcpu.arch.cr4_guest_owned_bits = KVM_CR4_GUEST_OWNED_BITS; |
| if (enable_ept) |
| vmx->vcpu.arch.cr4_guest_owned_bits |= X86_CR4_PGE; |
| if (is_guest_mode(&vmx->vcpu)) |
| vmx->vcpu.arch.cr4_guest_owned_bits &= |
| ~get_vmcs12(&vmx->vcpu)->cr4_guest_host_mask; |
| vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits); |
| } |
| |
| static u32 vmx_pin_based_exec_ctrl(struct vcpu_vmx *vmx) |
| { |
| u32 pin_based_exec_ctrl = vmcs_config.pin_based_exec_ctrl; |
| |
| if (!kvm_vcpu_apicv_active(&vmx->vcpu)) |
| pin_based_exec_ctrl &= ~PIN_BASED_POSTED_INTR; |
| |
| if (!enable_vnmi) |
| pin_based_exec_ctrl &= ~PIN_BASED_VIRTUAL_NMIS; |
| |
| /* Enable the preemption timer dynamically */ |
| pin_based_exec_ctrl &= ~PIN_BASED_VMX_PREEMPTION_TIMER; |
| return pin_based_exec_ctrl; |
| } |
| |
| static void vmx_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, vmx_pin_based_exec_ctrl(vmx)); |
| if (cpu_has_secondary_exec_ctrls()) { |
| if (kvm_vcpu_apicv_active(vcpu)) |
| vmcs_set_bits(SECONDARY_VM_EXEC_CONTROL, |
| SECONDARY_EXEC_APIC_REGISTER_VIRT | |
| SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY); |
| else |
| vmcs_clear_bits(SECONDARY_VM_EXEC_CONTROL, |
| SECONDARY_EXEC_APIC_REGISTER_VIRT | |
| SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY); |
| } |
| |
| if (cpu_has_vmx_msr_bitmap()) |
| vmx_update_msr_bitmap(vcpu); |
| } |
| |
| static u32 vmx_exec_control(struct vcpu_vmx *vmx) |
| { |
| u32 exec_control = vmcs_config.cpu_based_exec_ctrl; |
| |
| if (vmx->vcpu.arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT) |
| exec_control &= ~CPU_BASED_MOV_DR_EXITING; |
| |
| if (!cpu_need_tpr_shadow(&vmx->vcpu)) { |
| exec_control &= ~CPU_BASED_TPR_SHADOW; |
| #ifdef CONFIG_X86_64 |
| exec_control |= CPU_BASED_CR8_STORE_EXITING | |
| CPU_BASED_CR8_LOAD_EXITING; |
| #endif |
| } |
| if (!enable_ept) |
| exec_control |= CPU_BASED_CR3_STORE_EXITING | |
| CPU_BASED_CR3_LOAD_EXITING | |
| CPU_BASED_INVLPG_EXITING; |
| if (kvm_mwait_in_guest(vmx->vcpu.kvm)) |
| exec_control &= ~(CPU_BASED_MWAIT_EXITING | |
| CPU_BASED_MONITOR_EXITING); |
| if (kvm_hlt_in_guest(vmx->vcpu.kvm)) |
| exec_control &= ~CPU_BASED_HLT_EXITING; |
| return exec_control; |
| } |
| |
| static bool vmx_rdrand_supported(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_RDRAND_EXITING; |
| } |
| |
| static bool vmx_rdseed_supported(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_RDSEED_EXITING; |
| } |
| |
| static void vmx_compute_secondary_exec_control(struct vcpu_vmx *vmx) |
| { |
| struct kvm_vcpu *vcpu = &vmx->vcpu; |
| |
| u32 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl; |
| |
| if (!cpu_need_virtualize_apic_accesses(vcpu)) |
| exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; |
| if (vmx->vpid == 0) |
| exec_control &= ~SECONDARY_EXEC_ENABLE_VPID; |
| if (!enable_ept) { |
| exec_control &= ~SECONDARY_EXEC_ENABLE_EPT; |
| enable_unrestricted_guest = 0; |
| } |
| if (!enable_unrestricted_guest) |
| exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST; |
| if (kvm_pause_in_guest(vmx->vcpu.kvm)) |
| exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING; |
| if (!kvm_vcpu_apicv_active(vcpu)) |
| exec_control &= ~(SECONDARY_EXEC_APIC_REGISTER_VIRT | |
| SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY); |
| exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE; |
| |
| /* SECONDARY_EXEC_DESC is enabled/disabled on writes to CR4.UMIP, |
| * in vmx_set_cr4. */ |
| exec_control &= ~SECONDARY_EXEC_DESC; |
| |
| /* SECONDARY_EXEC_SHADOW_VMCS is enabled when L1 executes VMPTRLD |
| (handle_vmptrld). |
| We can NOT enable shadow_vmcs here because we don't have yet |
| a current VMCS12 |
| */ |
| exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS; |
| |
| if (!enable_pml) |
| exec_control &= ~SECONDARY_EXEC_ENABLE_PML; |
| |
| if (vmx_xsaves_supported()) { |
| /* Exposing XSAVES only when XSAVE is exposed */ |
| bool xsaves_enabled = |
| guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) && |
| guest_cpuid_has(vcpu, X86_FEATURE_XSAVES); |
| |
| if (!xsaves_enabled) |
| exec_control &= ~SECONDARY_EXEC_XSAVES; |
| |
| if (nested) { |
| if (xsaves_enabled) |
| vmx->nested.msrs.secondary_ctls_high |= |
| SECONDARY_EXEC_XSAVES; |
| else |
| vmx->nested.msrs.secondary_ctls_high &= |
| ~SECONDARY_EXEC_XSAVES; |
| } |
| } |
| |
| if (vmx_rdtscp_supported()) { |
| bool rdtscp_enabled = guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP); |
| if (!rdtscp_enabled) |
| exec_control &= ~SECONDARY_EXEC_RDTSCP; |
| |
| if (nested) { |
| if (rdtscp_enabled) |
| vmx->nested.msrs.secondary_ctls_high |= |
| SECONDARY_EXEC_RDTSCP; |
| else |
| vmx->nested.msrs.secondary_ctls_high &= |
| ~SECONDARY_EXEC_RDTSCP; |
| } |
| } |
| |
| if (vmx_invpcid_supported()) { |
| /* Exposing INVPCID only when PCID is exposed */ |
| bool invpcid_enabled = |
| guest_cpuid_has(vcpu, X86_FEATURE_INVPCID) && |
| guest_cpuid_has(vcpu, X86_FEATURE_PCID); |
| |
| if (!invpcid_enabled) { |
| exec_control &= ~SECONDARY_EXEC_ENABLE_INVPCID; |
| guest_cpuid_clear(vcpu, X86_FEATURE_INVPCID); |
| } |
| |
| if (nested) { |
| if (invpcid_enabled) |
| vmx->nested.msrs.secondary_ctls_high |= |
| SECONDARY_EXEC_ENABLE_INVPCID; |
| else |
| vmx->nested.msrs.secondary_ctls_high &= |
| ~SECONDARY_EXEC_ENABLE_INVPCID; |
| } |
| } |
| |
| if (vmx_rdrand_supported()) { |
| bool rdrand_enabled = guest_cpuid_has(vcpu, X86_FEATURE_RDRAND); |
| if (rdrand_enabled) |
| exec_control &= ~SECONDARY_EXEC_RDRAND_EXITING; |
| |
| if (nested) { |
| if (rdrand_enabled) |
| vmx->nested.msrs.secondary_ctls_high |= |
| SECONDARY_EXEC_RDRAND_EXITING; |
| else |
| vmx->nested.msrs.secondary_ctls_high &= |
| ~SECONDARY_EXEC_RDRAND_EXITING; |
| } |
| } |
| |
| if (vmx_rdseed_supported()) { |
| bool rdseed_enabled = guest_cpuid_has(vcpu, X86_FEATURE_RDSEED); |
| if (rdseed_enabled) |
| exec_control &= ~SECONDARY_EXEC_RDSEED_EXITING; |
| |
| if (nested) { |
| if (rdseed_enabled) |
| vmx->nested.msrs.secondary_ctls_high |= |
| SECONDARY_EXEC_RDSEED_EXITING; |
| else |
| vmx->nested.msrs.secondary_ctls_high &= |
| ~SECONDARY_EXEC_RDSEED_EXITING; |
| } |
| } |
| |
| vmx->secondary_exec_control = exec_control; |
| } |
| |
| static void ept_set_mmio_spte_mask(void) |
| { |
| /* |
| * EPT Misconfigurations can be generated if the value of bits 2:0 |
| * of an EPT paging-structure entry is 110b (write/execute). |
| */ |
| kvm_mmu_set_mmio_spte_mask(VMX_EPT_RWX_MASK, |
| VMX_EPT_MISCONFIG_WX_VALUE); |
| } |
| |
| #define VMX_XSS_EXIT_BITMAP 0 |
| /* |
| * Sets up the vmcs for emulated real mode. |
| */ |
| static void vmx_vcpu_setup(struct vcpu_vmx *vmx) |
| { |
| int i; |
| |
| if (enable_shadow_vmcs) { |
| /* |
| * At vCPU creation, "VMWRITE to any supported field |
| * in the VMCS" is supported, so use the more |
| * permissive vmx_vmread_bitmap to specify both read |
| * and write permissions for the shadow VMCS. |
| */ |
| vmcs_write64(VMREAD_BITMAP, __pa(vmx_vmread_bitmap)); |
| vmcs_write64(VMWRITE_BITMAP, __pa(vmx_vmread_bitmap)); |
| } |
| if (cpu_has_vmx_msr_bitmap()) |
| vmcs_write64(MSR_BITMAP, __pa(vmx->vmcs01.msr_bitmap)); |
| |
| vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */ |
| |
| /* Control */ |
| vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, vmx_pin_based_exec_ctrl(vmx)); |
| vmx->hv_deadline_tsc = -1; |
| |
| vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, vmx_exec_control(vmx)); |
| |
| if (cpu_has_secondary_exec_ctrls()) { |
| vmx_compute_secondary_exec_control(vmx); |
| vmcs_write32(SECONDARY_VM_EXEC_CONTROL, |
| vmx->secondary_exec_control); |
| } |
| |
| if (kvm_vcpu_apicv_active(&vmx->vcpu)) { |
| vmcs_write64(EOI_EXIT_BITMAP0, 0); |
| vmcs_write64(EOI_EXIT_BITMAP1, 0); |
| vmcs_write64(EOI_EXIT_BITMAP2, 0); |
| vmcs_write64(EOI_EXIT_BITMAP3, 0); |
| |
| vmcs_write16(GUEST_INTR_STATUS, 0); |
| |
| vmcs_write16(POSTED_INTR_NV, POSTED_INTR_VECTOR); |
| vmcs_write64(POSTED_INTR_DESC_ADDR, __pa((&vmx->pi_desc))); |
| } |
| |
| if (!kvm_pause_in_guest(vmx->vcpu.kvm)) { |
| vmcs_write32(PLE_GAP, ple_gap); |
| vmx->ple_window = ple_window; |
| vmx->ple_window_dirty = true; |
| } |
| |
| vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0); |
| vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0); |
| vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */ |
| |
| vmcs_write16(HOST_FS_SELECTOR, 0); /* 22.2.4 */ |
| vmcs_write16(HOST_GS_SELECTOR, 0); /* 22.2.4 */ |
| vmx_set_constant_host_state(vmx); |
| vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */ |
| vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */ |
| |
| if (cpu_has_vmx_vmfunc()) |
| vmcs_write64(VM_FUNCTION_CONTROL, 0); |
| |
| vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0); |
| vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0); |
| vmcs_write64(VM_EXIT_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.host.val)); |
| vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0); |
| vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.guest.val)); |
| |
| if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) |
| vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat); |
| |
| for (i = 0; i < ARRAY_SIZE(vmx_msr_index); ++i) { |
| u32 index = vmx_msr_index[i]; |
| u32 data_low, data_high; |
| int j = vmx->nmsrs; |
| |
| if (rdmsr_safe(index, &data_low, &data_high) < 0) |
| continue; |
| if (wrmsr_safe(index, data_low, data_high) < 0) |
| continue; |
| vmx->guest_msrs[j].index = i; |
| vmx->guest_msrs[j].data = 0; |
| vmx->guest_msrs[j].mask = -1ull; |
| ++vmx->nmsrs; |
| } |
| |
| vmx->arch_capabilities = kvm_get_arch_capabilities(); |
| |
| vm_exit_controls_init(vmx, vmcs_config.vmexit_ctrl); |
| |
| /* 22.2.1, 20.8.1 */ |
| vm_entry_controls_init(vmx, vmcs_config.vmentry_ctrl); |
| |
| vmx->vcpu.arch.cr0_guest_owned_bits = X86_CR0_TS; |
| vmcs_writel(CR0_GUEST_HOST_MASK, ~X86_CR0_TS); |
| |
| set_cr4_guest_host_mask(vmx); |
| |
| if (vmx_xsaves_supported()) |
| vmcs_write64(XSS_EXIT_BITMAP, VMX_XSS_EXIT_BITMAP); |
| |
| if (enable_pml) { |
| vmcs_write64(PML_ADDRESS, page_to_phys(vmx->pml_pg)); |
| vmcs_write16(GUEST_PML_INDEX, PML_ENTITY_NUM - 1); |
| } |
| |
| if (cpu_has_vmx_encls_vmexit()) |
| vmcs_write64(ENCLS_EXITING_BITMAP, -1ull); |
| } |
| |
| static void vmx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct msr_data apic_base_msr; |
| u64 cr0; |
| |
| vmx->rmode.vm86_active = 0; |
| vmx->spec_ctrl = 0; |
| |
| vcpu->arch.microcode_version = 0x100000000ULL; |
| vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val(); |
| kvm_set_cr8(vcpu, 0); |
| |
| if (!init_event) { |
| apic_base_msr.data = APIC_DEFAULT_PHYS_BASE | |
| MSR_IA32_APICBASE_ENABLE; |
| if (kvm_vcpu_is_reset_bsp(vcpu)) |
| apic_base_msr.data |= MSR_IA32_APICBASE_BSP; |
| apic_base_msr.host_initiated = true; |
| kvm_set_apic_base(vcpu, &apic_base_msr); |
| } |
| |
| vmx_segment_cache_clear(vmx); |
| |
| seg_setup(VCPU_SREG_CS); |
| vmcs_write16(GUEST_CS_SELECTOR, 0xf000); |
| vmcs_writel(GUEST_CS_BASE, 0xffff0000ul); |
| |
| seg_setup(VCPU_SREG_DS); |
| seg_setup(VCPU_SREG_ES); |
| seg_setup(VCPU_SREG_FS); |
| seg_setup(VCPU_SREG_GS); |
| seg_setup(VCPU_SREG_SS); |
| |
| vmcs_write16(GUEST_TR_SELECTOR, 0); |
| vmcs_writel(GUEST_TR_BASE, 0); |
| vmcs_write32(GUEST_TR_LIMIT, 0xffff); |
| vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); |
| |
| vmcs_write16(GUEST_LDTR_SELECTOR, 0); |
| vmcs_writel(GUEST_LDTR_BASE, 0); |
| vmcs_write32(GUEST_LDTR_LIMIT, 0xffff); |
| vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082); |
| |
| if (!init_event) { |
| vmcs_write32(GUEST_SYSENTER_CS, 0); |
| vmcs_writel(GUEST_SYSENTER_ESP, 0); |
| vmcs_writel(GUEST_SYSENTER_EIP, 0); |
| vmcs_write64(GUEST_IA32_DEBUGCTL, 0); |
| } |
| |
| kvm_set_rflags(vcpu, X86_EFLAGS_FIXED); |
| kvm_rip_write(vcpu, 0xfff0); |
| |
| vmcs_writel(GUEST_GDTR_BASE, 0); |
| vmcs_write32(GUEST_GDTR_LIMIT, 0xffff); |
| |
| vmcs_writel(GUEST_IDTR_BASE, 0); |
| vmcs_write32(GUEST_IDTR_LIMIT, 0xffff); |
| |
| vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE); |
| vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0); |
| vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS, 0); |
| if (kvm_mpx_supported()) |
| vmcs_write64(GUEST_BNDCFGS, 0); |
| |
| setup_msrs(vmx); |
| |
| vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */ |
| |
| if (cpu_has_vmx_tpr_shadow() && !init_event) { |
| vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0); |
| if (cpu_need_tpr_shadow(vcpu)) |
| vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, |
| __pa(vcpu->arch.apic->regs)); |
| vmcs_write32(TPR_THRESHOLD, 0); |
| } |
| |
| kvm_make_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu); |
| |
| if (vmx->vpid != 0) |
| vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid); |
| |
| cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET; |
| vmx->vcpu.arch.cr0 = cr0; |
| vmx_set_cr0(vcpu, cr0); /* enter rmode */ |
| vmx_set_cr4(vcpu, 0); |
| vmx_set_efer(vcpu, 0); |
| |
| update_exception_bitmap(vcpu); |
| |
| vpid_sync_context(vmx->vpid); |
| if (init_event) |
| vmx_clear_hlt(vcpu); |
| } |
| |
| /* |
| * In nested virtualization, check if L1 asked to exit on external interrupts. |
| * For most existing hypervisors, this will always return true. |
| */ |
| static bool nested_exit_on_intr(struct kvm_vcpu *vcpu) |
| { |
| return get_vmcs12(vcpu)->pin_based_vm_exec_control & |
| PIN_BASED_EXT_INTR_MASK; |
| } |
| |
| /* |
| * In nested virtualization, check if L1 has set |
| * VM_EXIT_ACK_INTR_ON_EXIT |
| */ |
| static bool nested_exit_intr_ack_set(struct kvm_vcpu *vcpu) |
| { |
| return get_vmcs12(vcpu)->vm_exit_controls & |
| VM_EXIT_ACK_INTR_ON_EXIT; |
| } |
| |
| static bool nested_exit_on_nmi(struct kvm_vcpu *vcpu) |
| { |
| return nested_cpu_has_nmi_exiting(get_vmcs12(vcpu)); |
| } |
| |
| static void enable_irq_window(struct kvm_vcpu *vcpu) |
| { |
| vmcs_set_bits(CPU_BASED_VM_EXEC_CONTROL, |
| CPU_BASED_VIRTUAL_INTR_PENDING); |
| } |
| |
| static void enable_nmi_window(struct kvm_vcpu *vcpu) |
| { |
| if (!enable_vnmi || |
| vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI) { |
| enable_irq_window(vcpu); |
| return; |
| } |
| |
| vmcs_set_bits(CPU_BASED_VM_EXEC_CONTROL, |
| CPU_BASED_VIRTUAL_NMI_PENDING); |
| } |
| |
| static void vmx_inject_irq(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| uint32_t intr; |
| int irq = vcpu->arch.interrupt.nr; |
| |
| trace_kvm_inj_virq(irq); |
| |
| ++vcpu->stat.irq_injections; |
| if (vmx->rmode.vm86_active) { |
| int inc_eip = 0; |
| if (vcpu->arch.interrupt.soft) |
| inc_eip = vcpu->arch.event_exit_inst_len; |
| if (kvm_inject_realmode_interrupt(vcpu, irq, inc_eip) != EMULATE_DONE) |
| kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); |
| return; |
| } |
| intr = irq | INTR_INFO_VALID_MASK; |
| if (vcpu->arch.interrupt.soft) { |
| intr |= INTR_TYPE_SOFT_INTR; |
| vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, |
| vmx->vcpu.arch.event_exit_inst_len); |
| } else |
| intr |= INTR_TYPE_EXT_INTR; |
| vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr); |
| |
| vmx_clear_hlt(vcpu); |
| } |
| |
| static void vmx_inject_nmi(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| if (!enable_vnmi) { |
| /* |
| * Tracking the NMI-blocked state in software is built upon |
| * finding the next open IRQ window. This, in turn, depends on |
| * well-behaving guests: They have to keep IRQs disabled at |
| * least as long as the NMI handler runs. Otherwise we may |
| * cause NMI nesting, maybe breaking the guest. But as this is |
| * highly unlikely, we can live with the residual risk. |
| */ |
| vmx->loaded_vmcs->soft_vnmi_blocked = 1; |
| vmx->loaded_vmcs->vnmi_blocked_time = 0; |
| } |
| |
| ++vcpu->stat.nmi_injections; |
| vmx->loaded_vmcs->nmi_known_unmasked = false; |
| |
| if (vmx->rmode.vm86_active) { |
| if (kvm_inject_realmode_interrupt(vcpu, NMI_VECTOR, 0) != EMULATE_DONE) |
| kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); |
| return; |
| } |
| |
| vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, |
| INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR); |
| |
| vmx_clear_hlt(vcpu); |
| } |
| |
| static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| bool masked; |
| |
| if (!enable_vnmi) |
| return vmx->loaded_vmcs->soft_vnmi_blocked; |
| if (vmx->loaded_vmcs->nmi_known_unmasked) |
| return false; |
| masked = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_NMI; |
| vmx->loaded_vmcs->nmi_known_unmasked = !masked; |
| return masked; |
| } |
| |
| static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| if (!enable_vnmi) { |
| if (vmx->loaded_vmcs->soft_vnmi_blocked != masked) { |
| vmx->loaded_vmcs->soft_vnmi_blocked = masked; |
| vmx->loaded_vmcs->vnmi_blocked_time = 0; |
| } |
| } else { |
| vmx->loaded_vmcs->nmi_known_unmasked = !masked; |
| if (masked) |
| vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, |
| GUEST_INTR_STATE_NMI); |
| else |
| vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO, |
| GUEST_INTR_STATE_NMI); |
| } |
| } |
| |
| static int vmx_nmi_allowed(struct kvm_vcpu *vcpu) |
| { |
| if (to_vmx(vcpu)->nested.nested_run_pending) |
| return 0; |
| |
| if (!enable_vnmi && |
| to_vmx(vcpu)->loaded_vmcs->soft_vnmi_blocked) |
| return 0; |
| |
| return !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & |
| (GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_STI |
| | GUEST_INTR_STATE_NMI)); |
| } |
| |
| static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu) |
| { |
| return (!to_vmx(vcpu)->nested.nested_run_pending && |
| vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) && |
| !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & |
| (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS)); |
| } |
| |
| static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr) |
| { |
| int ret; |
| |
| if (enable_unrestricted_guest) |
| return 0; |
| |
| ret = x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, addr, |
| PAGE_SIZE * 3); |
| if (ret) |
| return ret; |
| to_kvm_vmx(kvm)->tss_addr = addr; |
| return init_rmode_tss(kvm); |
| } |
| |
| static int vmx_set_identity_map_addr(struct kvm *kvm, u64 ident_addr) |
| { |
| to_kvm_vmx(kvm)->ept_identity_map_addr = ident_addr; |
| return 0; |
| } |
| |
| static bool rmode_exception(struct kvm_vcpu *vcpu, int vec) |
| { |
| switch (vec) { |
| case BP_VECTOR: |
| /* |
| * Update instruction length as we may reinject the exception |
| * from user space while in guest debugging mode. |
| */ |
| to_vmx(vcpu)->vcpu.arch.event_exit_inst_len = |
| vmcs_read32(VM_EXIT_INSTRUCTION_LEN); |
| if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) |
| return false; |
| /* fall through */ |
| case DB_VECTOR: |
| if (vcpu->guest_debug & |
| (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) |
| return false; |
| /* fall through */ |
| case DE_VECTOR: |
| case OF_VECTOR: |
| case BR_VECTOR: |
| case UD_VECTOR: |
| case DF_VECTOR: |
| case SS_VECTOR: |
| case GP_VECTOR: |
| case MF_VECTOR: |
| return true; |
| break; |
| } |
| return false; |
| } |
| |
| static int handle_rmode_exception(struct kvm_vcpu *vcpu, |
| int vec, u32 err_code) |
| { |
| /* |
| * Instruction with address size override prefix opcode 0x67 |
| * Cause the #SS fault with 0 error code in VM86 mode. |
| */ |
| if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0) { |
| if (kvm_emulate_instruction(vcpu, 0) == EMULATE_DONE) { |
| if (vcpu->arch.halt_request) { |
| vcpu->arch.halt_request = 0; |
| return kvm_vcpu_halt(vcpu); |
| } |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* |
| * Forward all other exceptions that are valid in real mode. |
| * FIXME: Breaks guest debugging in real mode, needs to be fixed with |
| * the required debugging infrastructure rework. |
| */ |
| kvm_queue_exception(vcpu, vec); |
| return 1; |
| } |
| |
| /* |
| * Trigger machine check on the host. We assume all the MSRs are already set up |
| * by the CPU and that we still run on the same CPU as the MCE occurred on. |
| * We pass a fake environment to the machine check handler because we want |
| * the guest to be always treated like user space, no matter what context |
| * it used internally. |
| */ |
| static void kvm_machine_check(void) |
| { |
| #if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64) |
| struct pt_regs regs = { |
| .cs = 3, /* Fake ring 3 no matter what the guest ran on */ |
| .flags = X86_EFLAGS_IF, |
| }; |
| |
| do_machine_check(®s, 0); |
| #endif |
| } |
| |
| static int handle_machine_check(struct kvm_vcpu *vcpu) |
| { |
| /* already handled by vcpu_run */ |
| return 1; |
| } |
| |
| static int handle_exception(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct kvm_run *kvm_run = vcpu->run; |
| u32 intr_info, ex_no, error_code; |
| unsigned long cr2, rip, dr6; |
| u32 vect_info; |
| enum emulation_result er; |
| |
| vect_info = vmx->idt_vectoring_info; |
| intr_info = vmx->exit_intr_info; |
| |
| if (is_machine_check(intr_info)) |
| return handle_machine_check(vcpu); |
| |
| if (is_nmi(intr_info)) |
| return 1; /* already handled by vmx_vcpu_run() */ |
| |
| if (is_invalid_opcode(intr_info)) |
| return handle_ud(vcpu); |
| |
| error_code = 0; |
| if (intr_info & INTR_INFO_DELIVER_CODE_MASK) |
| error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE); |
| |
| if (!vmx->rmode.vm86_active && is_gp_fault(intr_info)) { |
| WARN_ON_ONCE(!enable_vmware_backdoor); |
| er = kvm_emulate_instruction(vcpu, |
| EMULTYPE_VMWARE | EMULTYPE_NO_UD_ON_FAIL); |
| if (er == EMULATE_USER_EXIT) |
| return 0; |
| else if (er != EMULATE_DONE) |
| kvm_queue_exception_e(vcpu, GP_VECTOR, error_code); |
| return 1; |
| } |
| |
| /* |
| * The #PF with PFEC.RSVD = 1 indicates the guest is accessing |
| * MMIO, it is better to report an internal error. |
| * See the comments in vmx_handle_exit. |
| */ |
| if ((vect_info & VECTORING_INFO_VALID_MASK) && |
| !(is_page_fault(intr_info) && !(error_code & PFERR_RSVD_MASK))) { |
| vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; |
| vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_SIMUL_EX; |
| vcpu->run->internal.ndata = 3; |
| vcpu->run->internal.data[0] = vect_info; |
| vcpu->run->internal.data[1] = intr_info; |
| vcpu->run->internal.data[2] = error_code; |
| return 0; |
| } |
| |
| if (is_page_fault(intr_info)) { |
| cr2 = vmcs_readl(EXIT_QUALIFICATION); |
| /* EPT won't cause page fault directly */ |
| WARN_ON_ONCE(!vcpu->arch.apf.host_apf_reason && enable_ept); |
| return kvm_handle_page_fault(vcpu, error_code, cr2, NULL, 0); |
| } |
| |
| ex_no = intr_info & INTR_INFO_VECTOR_MASK; |
| |
| if (vmx->rmode.vm86_active && rmode_exception(vcpu, ex_no)) |
| return handle_rmode_exception(vcpu, ex_no, error_code); |
| |
| switch (ex_no) { |
| case AC_VECTOR: |
| kvm_queue_exception_e(vcpu, AC_VECTOR, error_code); |
| return 1; |
| case DB_VECTOR: |
| dr6 = vmcs_readl(EXIT_QUALIFICATION); |
| if (!(vcpu->guest_debug & |
| (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) { |
| vcpu->arch.dr6 &= ~15; |
| vcpu->arch.dr6 |= dr6 | DR6_RTM; |
| if (is_icebp(intr_info)) |
| skip_emulated_instruction(vcpu); |
| |
| kvm_queue_exception(vcpu, DB_VECTOR); |
| return 1; |
| } |
| kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1; |
| kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7); |
| /* fall through */ |
| case BP_VECTOR: |
| /* |
| * Update instruction length as we may reinject #BP from |
| * user space while in guest debugging mode. Reading it for |
| * #DB as well causes no harm, it is not used in that case. |
| */ |
| vmx->vcpu.arch.event_exit_inst_len = |
| vmcs_read32(VM_EXIT_INSTRUCTION_LEN); |
| kvm_run->exit_reason = KVM_EXIT_DEBUG; |
| rip = kvm_rip_read(vcpu); |
| kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip; |
| kvm_run->debug.arch.exception = ex_no; |
| break; |
| default: |
| kvm_run->exit_reason = KVM_EXIT_EXCEPTION; |
| kvm_run->ex.exception = ex_no; |
| kvm_run->ex.error_code = error_code; |
| break; |
| } |
| return 0; |
| } |
| |
| static int handle_external_interrupt(struct kvm_vcpu *vcpu) |
| { |
| ++vcpu->stat.irq_exits; |
| return 1; |
| } |
| |
| static int handle_triple_fault(struct kvm_vcpu *vcpu) |
| { |
| vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; |
| vcpu->mmio_needed = 0; |
| return 0; |
| } |
| |
| static int handle_io(struct kvm_vcpu *vcpu) |
| { |
| unsigned long exit_qualification; |
| int size, in, string; |
| unsigned port; |
| |
| exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| string = (exit_qualification & 16) != 0; |
| |
| ++vcpu->stat.io_exits; |
| |
| if (string) |
| return kvm_emulate_instruction(vcpu, 0) == EMULATE_DONE; |
| |
| port = exit_qualification >> 16; |
| size = (exit_qualification & 7) + 1; |
| in = (exit_qualification & 8) != 0; |
| |
| return kvm_fast_pio(vcpu, size, port, in); |
| } |
| |
| static void |
| vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall) |
| { |
| /* |
| * Patch in the VMCALL instruction: |
| */ |
| hypercall[0] = 0x0f; |
| hypercall[1] = 0x01; |
| hypercall[2] = 0xc1; |
| } |
| |
| /* called to set cr0 as appropriate for a mov-to-cr0 exit. */ |
| static int handle_set_cr0(struct kvm_vcpu *vcpu, unsigned long val) |
| { |
| if (is_guest_mode(vcpu)) { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| unsigned long orig_val = val; |
| |
| /* |
| * We get here when L2 changed cr0 in a way that did not change |
| * any of L1's shadowed bits (see nested_vmx_exit_handled_cr), |
| * but did change L0 shadowed bits. So we first calculate the |
| * effective cr0 value that L1 would like to write into the |
| * hardware. It consists of the L2-owned bits from the new |
| * value combined with the L1-owned bits from L1's guest_cr0. |
| */ |
| val = (val & ~vmcs12->cr0_guest_host_mask) | |
| (vmcs12->guest_cr0 & vmcs12->cr0_guest_host_mask); |
| |
| if (!nested_guest_cr0_valid(vcpu, val)) |
| return 1; |
| |
| if (kvm_set_cr0(vcpu, val)) |
| return 1; |
| vmcs_writel(CR0_READ_SHADOW, orig_val); |
| return 0; |
| } else { |
| if (to_vmx(vcpu)->nested.vmxon && |
| !nested_host_cr0_valid(vcpu, val)) |
| return 1; |
| |
| return kvm_set_cr0(vcpu, val); |
| } |
| } |
| |
| static int handle_set_cr4(struct kvm_vcpu *vcpu, unsigned long val) |
| { |
| if (is_guest_mode(vcpu)) { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| unsigned long orig_val = val; |
| |
| /* analogously to handle_set_cr0 */ |
| val = (val & ~vmcs12->cr4_guest_host_mask) | |
| (vmcs12->guest_cr4 & vmcs12->cr4_guest_host_mask); |
| if (kvm_set_cr4(vcpu, val)) |
| return 1; |
| vmcs_writel(CR4_READ_SHADOW, orig_val); |
| return 0; |
| } else |
| return kvm_set_cr4(vcpu, val); |
| } |
| |
| static int handle_desc(struct kvm_vcpu *vcpu) |
| { |
| WARN_ON(!(vcpu->arch.cr4 & X86_CR4_UMIP)); |
| return kvm_emulate_instruction(vcpu, 0) == EMULATE_DONE; |
| } |
| |
| static int handle_cr(struct kvm_vcpu *vcpu) |
| { |
| unsigned long exit_qualification, val; |
| int cr; |
| int reg; |
| int err; |
| int ret; |
| |
| exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| cr = exit_qualification & 15; |
| reg = (exit_qualification >> 8) & 15; |
| switch ((exit_qualification >> 4) & 3) { |
| case 0: /* mov to cr */ |
| val = kvm_register_readl(vcpu, reg); |
| trace_kvm_cr_write(cr, val); |
| switch (cr) { |
| case 0: |
| err = handle_set_cr0(vcpu, val); |
| return kvm_complete_insn_gp(vcpu, err); |
| case 3: |
| WARN_ON_ONCE(enable_unrestricted_guest); |
| err = kvm_set_cr3(vcpu, val); |
| return kvm_complete_insn_gp(vcpu, err); |
| case 4: |
| err = handle_set_cr4(vcpu, val); |
| return kvm_complete_insn_gp(vcpu, err); |
| case 8: { |
| u8 cr8_prev = kvm_get_cr8(vcpu); |
| u8 cr8 = (u8)val; |
| err = kvm_set_cr8(vcpu, cr8); |
| ret = kvm_complete_insn_gp(vcpu, err); |
| if (lapic_in_kernel(vcpu)) |
| return ret; |
| if (cr8_prev <= cr8) |
| return ret; |
| /* |
| * TODO: we might be squashing a |
| * KVM_GUESTDBG_SINGLESTEP-triggered |
| * KVM_EXIT_DEBUG here. |
| */ |
| vcpu->run->exit_reason = KVM_EXIT_SET_TPR; |
| return 0; |
| } |
| } |
| break; |
| case 2: /* clts */ |
| WARN_ONCE(1, "Guest should always own CR0.TS"); |
| vmx_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~X86_CR0_TS)); |
| trace_kvm_cr_write(0, kvm_read_cr0(vcpu)); |
| return kvm_skip_emulated_instruction(vcpu); |
| case 1: /*mov from cr*/ |
| switch (cr) { |
| case 3: |
| WARN_ON_ONCE(enable_unrestricted_guest); |
| val = kvm_read_cr3(vcpu); |
| kvm_register_write(vcpu, reg, val); |
| trace_kvm_cr_read(cr, val); |
| return kvm_skip_emulated_instruction(vcpu); |
| case 8: |
| val = kvm_get_cr8(vcpu); |
| kvm_register_write(vcpu, reg, val); |
| trace_kvm_cr_read(cr, val); |
| return kvm_skip_emulated_instruction(vcpu); |
| } |
| break; |
| case 3: /* lmsw */ |
| val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f; |
| trace_kvm_cr_write(0, (kvm_read_cr0(vcpu) & ~0xful) | val); |
| kvm_lmsw(vcpu, val); |
| |
| return kvm_skip_emulated_instruction(vcpu); |
| default: |
| break; |
| } |
| vcpu->run->exit_reason = 0; |
| vcpu_unimpl(vcpu, "unhandled control register: op %d cr %d\n", |
| (int)(exit_qualification >> 4) & 3, cr); |
| return 0; |
| } |
| |
| static int handle_dr(struct kvm_vcpu *vcpu) |
| { |
| unsigned long exit_qualification; |
| int dr, dr7, reg; |
| |
| exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| dr = exit_qualification & DEBUG_REG_ACCESS_NUM; |
| |
| /* First, if DR does not exist, trigger UD */ |
| if (!kvm_require_dr(vcpu, dr)) |
| return 1; |
| |
| /* Do not handle if the CPL > 0, will trigger GP on re-entry */ |
| if (!kvm_require_cpl(vcpu, 0)) |
| return 1; |
| dr7 = vmcs_readl(GUEST_DR7); |
| if (dr7 & DR7_GD) { |
| /* |
| * As the vm-exit takes precedence over the debug trap, we |
| * need to emulate the latter, either for the host or the |
| * guest debugging itself. |
| */ |
| if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { |
| vcpu->run->debug.arch.dr6 = vcpu->arch.dr6; |
| vcpu->run->debug.arch.dr7 = dr7; |
| vcpu->run->debug.arch.pc = kvm_get_linear_rip(vcpu); |
| vcpu->run->debug.arch.exception = DB_VECTOR; |
| vcpu->run->exit_reason = KVM_EXIT_DEBUG; |
| return 0; |
| } else { |
| vcpu->arch.dr6 &= ~15; |
| vcpu->arch.dr6 |= DR6_BD | DR6_RTM; |
| kvm_queue_exception(vcpu, DB_VECTOR); |
| return 1; |
| } |
| } |
| |
| if (vcpu->guest_debug == 0) { |
| vmcs_clear_bits(CPU_BASED_VM_EXEC_CONTROL, |
| CPU_BASED_MOV_DR_EXITING); |
| |
| /* |
| * No more DR vmexits; force a reload of the debug registers |
| * and reenter on this instruction. The next vmexit will |
| * retrieve the full state of the debug registers. |
| */ |
| vcpu->arch.switch_db_regs |= KVM_DEBUGREG_WONT_EXIT; |
| return 1; |
| } |
| |
| reg = DEBUG_REG_ACCESS_REG(exit_qualification); |
| if (exit_qualification & TYPE_MOV_FROM_DR) { |
| unsigned long val; |
| |
| if (kvm_get_dr(vcpu, dr, &val)) |
| return 1; |
| kvm_register_write(vcpu, reg, val); |
| } else |
| if (kvm_set_dr(vcpu, dr, kvm_register_readl(vcpu, reg))) |
| return 1; |
| |
| return kvm_skip_emulated_instruction(vcpu); |
| } |
| |
| static u64 vmx_get_dr6(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->arch.dr6; |
| } |
| |
| static void vmx_set_dr6(struct kvm_vcpu *vcpu, unsigned long val) |
| { |
| } |
| |
| static void vmx_sync_dirty_debug_regs(struct kvm_vcpu *vcpu) |
| { |
| get_debugreg(vcpu->arch.db[0], 0); |
| get_debugreg(vcpu->arch.db[1], 1); |
| get_debugreg(vcpu->arch.db[2], 2); |
| get_debugreg(vcpu->arch.db[3], 3); |
| get_debugreg(vcpu->arch.dr6, 6); |
| vcpu->arch.dr7 = vmcs_readl(GUEST_DR7); |
| |
| vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_WONT_EXIT; |
| vmcs_set_bits(CPU_BASED_VM_EXEC_CONTROL, CPU_BASED_MOV_DR_EXITING); |
| } |
| |
| static void vmx_set_dr7(struct kvm_vcpu *vcpu, unsigned long val) |
| { |
| vmcs_writel(GUEST_DR7, val); |
| } |
| |
| static int handle_cpuid(struct kvm_vcpu *vcpu) |
| { |
| return kvm_emulate_cpuid(vcpu); |
| } |
| |
| static int handle_rdmsr(struct kvm_vcpu *vcpu) |
| { |
| u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX]; |
| struct msr_data msr_info; |
| |
| msr_info.index = ecx; |
| msr_info.host_initiated = false; |
| if (vmx_get_msr(vcpu, &msr_info)) { |
| trace_kvm_msr_read_ex(ecx); |
| kvm_inject_gp(vcpu, 0); |
| return 1; |
| } |
| |
| trace_kvm_msr_read(ecx, msr_info.data); |
| |
| /* FIXME: handling of bits 32:63 of rax, rdx */ |
| vcpu->arch.regs[VCPU_REGS_RAX] = msr_info.data & -1u; |
| vcpu->arch.regs[VCPU_REGS_RDX] = (msr_info.data >> 32) & -1u; |
| return kvm_skip_emulated_instruction(vcpu); |
| } |
| |
| static int handle_wrmsr(struct kvm_vcpu *vcpu) |
| { |
| struct msr_data msr; |
| u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX]; |
| u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u) |
| | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32); |
| |
| msr.data = data; |
| msr.index = ecx; |
| msr.host_initiated = false; |
| if (kvm_set_msr(vcpu, &msr) != 0) { |
| trace_kvm_msr_write_ex(ecx, data); |
| kvm_inject_gp(vcpu, 0); |
| return 1; |
| } |
| |
| trace_kvm_msr_write(ecx, data); |
| return kvm_skip_emulated_instruction(vcpu); |
| } |
| |
| static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu) |
| { |
| kvm_apic_update_ppr(vcpu); |
| return 1; |
| } |
| |
| static int handle_interrupt_window(struct kvm_vcpu *vcpu) |
| { |
| vmcs_clear_bits(CPU_BASED_VM_EXEC_CONTROL, |
| CPU_BASED_VIRTUAL_INTR_PENDING); |
| |
| kvm_make_request(KVM_REQ_EVENT, vcpu); |
| |
| ++vcpu->stat.irq_window_exits; |
| return 1; |
| } |
| |
| static int handle_halt(struct kvm_vcpu *vcpu) |
| { |
| return kvm_emulate_halt(vcpu); |
| } |
| |
| static int handle_vmcall(struct kvm_vcpu *vcpu) |
| { |
| return kvm_emulate_hypercall(vcpu); |
| } |
| |
| static int handle_invd(struct kvm_vcpu *vcpu) |
| { |
| return kvm_emulate_instruction(vcpu, 0) == EMULATE_DONE; |
| } |
| |
| static int handle_invlpg(struct kvm_vcpu *vcpu) |
| { |
| unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| |
| kvm_mmu_invlpg(vcpu, exit_qualification); |
| return kvm_skip_emulated_instruction(vcpu); |
| } |
| |
| static int handle_rdpmc(struct kvm_vcpu *vcpu) |
| { |
| int err; |
| |
| err = kvm_rdpmc(vcpu); |
| return kvm_complete_insn_gp(vcpu, err); |
| } |
| |
| static int handle_wbinvd(struct kvm_vcpu *vcpu) |
| { |
| return kvm_emulate_wbinvd(vcpu); |
| } |
| |
| static int handle_xsetbv(struct kvm_vcpu *vcpu) |
| { |
| u64 new_bv = kvm_read_edx_eax(vcpu); |
| u32 index = kvm_register_read(vcpu, VCPU_REGS_RCX); |
| |
| if (kvm_set_xcr(vcpu, index, new_bv) == 0) |
| return kvm_skip_emulated_instruction(vcpu); |
| return 1; |
| } |
| |
| static int handle_xsaves(struct kvm_vcpu *vcpu) |
| { |
| kvm_skip_emulated_instruction(vcpu); |
| WARN(1, "this should never happen\n"); |
| return 1; |
| } |
| |
| static int handle_xrstors(struct kvm_vcpu *vcpu) |
| { |
| kvm_skip_emulated_instruction(vcpu); |
| WARN(1, "this should never happen\n"); |
| return 1; |
| } |
| |
| static int handle_apic_access(struct kvm_vcpu *vcpu) |
| { |
| if (likely(fasteoi)) { |
| unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| int access_type, offset; |
| |
| access_type = exit_qualification & APIC_ACCESS_TYPE; |
| offset = exit_qualification & APIC_ACCESS_OFFSET; |
| /* |
| * Sane guest uses MOV to write EOI, with written value |
| * not cared. So make a short-circuit here by avoiding |
| * heavy instruction emulation. |
| */ |
| if ((access_type == TYPE_LINEAR_APIC_INST_WRITE) && |
| (offset == APIC_EOI)) { |
| kvm_lapic_set_eoi(vcpu); |
| return kvm_skip_emulated_instruction(vcpu); |
| } |
| } |
| return kvm_emulate_instruction(vcpu, 0) == EMULATE_DONE; |
| } |
| |
| static int handle_apic_eoi_induced(struct kvm_vcpu *vcpu) |
| { |
| unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| int vector = exit_qualification & 0xff; |
| |
| /* EOI-induced VM exit is trap-like and thus no need to adjust IP */ |
| kvm_apic_set_eoi_accelerated(vcpu, vector); |
| return 1; |
| } |
| |
| static int handle_apic_write(struct kvm_vcpu *vcpu) |
| { |
| unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| u32 offset = exit_qualification & 0xfff; |
| |
| /* APIC-write VM exit is trap-like and thus no need to adjust IP */ |
| kvm_apic_write_nodecode(vcpu, offset); |
| return 1; |
| } |
| |
| static int handle_task_switch(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| unsigned long exit_qualification; |
| bool has_error_code = false; |
| u32 error_code = 0; |
| u16 tss_selector; |
| int reason, type, idt_v, idt_index; |
| |
| idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK); |
| idt_index = (vmx->idt_vectoring_info & VECTORING_INFO_VECTOR_MASK); |
| type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK); |
| |
| exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| |
| reason = (u32)exit_qualification >> 30; |
| if (reason == TASK_SWITCH_GATE && idt_v) { |
| switch (type) { |
| case INTR_TYPE_NMI_INTR: |
| vcpu->arch.nmi_injected = false; |
| vmx_set_nmi_mask(vcpu, true); |
| break; |
| case INTR_TYPE_EXT_INTR: |
| case INTR_TYPE_SOFT_INTR: |
| kvm_clear_interrupt_queue(vcpu); |
| break; |
| case INTR_TYPE_HARD_EXCEPTION: |
| if (vmx->idt_vectoring_info & |
| VECTORING_INFO_DELIVER_CODE_MASK) { |
| has_error_code = true; |
| error_code = |
| vmcs_read32(IDT_VECTORING_ERROR_CODE); |
| } |
| /* fall through */ |
| case INTR_TYPE_SOFT_EXCEPTION: |
| kvm_clear_exception_queue(vcpu); |
| break; |
| default: |
| break; |
| } |
| } |
| tss_selector = exit_qualification; |
| |
| if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION && |
| type != INTR_TYPE_EXT_INTR && |
| type != INTR_TYPE_NMI_INTR)) |
| skip_emulated_instruction(vcpu); |
| |
| if (kvm_task_switch(vcpu, tss_selector, |
| type == INTR_TYPE_SOFT_INTR ? idt_index : -1, reason, |
| has_error_code, error_code) == EMULATE_FAIL) { |
| vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; |
| vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; |
| vcpu->run->internal.ndata = 0; |
| return 0; |
| } |
| |
| /* |
| * TODO: What about debug traps on tss switch? |
| * Are we supposed to inject them and update dr6? |
| */ |
| |
| return 1; |
| } |
| |
| static int handle_ept_violation(struct kvm_vcpu *vcpu) |
| { |
| unsigned long exit_qualification; |
| gpa_t gpa; |
| u64 error_code; |
| |
| exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| |
| /* |
| * EPT violation happened while executing iret from NMI, |
| * "blocked by NMI" bit has to be set before next VM entry. |
| * There are errata that may cause this bit to not be set: |
| * AAK134, BY25. |
| */ |
| if (!(to_vmx(vcpu)->idt_vectoring_info & VECTORING_INFO_VALID_MASK) && |
| enable_vnmi && |
| (exit_qualification & INTR_INFO_UNBLOCK_NMI)) |
| vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI); |
| |
| gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS); |
| trace_kvm_page_fault(gpa, exit_qualification); |
| |
| /* Is it a read fault? */ |
| error_code = (exit_qualification & EPT_VIOLATION_ACC_READ) |
| ? PFERR_USER_MASK : 0; |
| /* Is it a write fault? */ |
| error_code |= (exit_qualification & EPT_VIOLATION_ACC_WRITE) |
| ? PFERR_WRITE_MASK : 0; |
| /* Is it a fetch fault? */ |
| error_code |= (exit_qualification & EPT_VIOLATION_ACC_INSTR) |
| ? PFERR_FETCH_MASK : 0; |
| /* ept page table entry is present? */ |
| error_code |= (exit_qualification & |
| (EPT_VIOLATION_READABLE | EPT_VIOLATION_WRITABLE | |
| EPT_VIOLATION_EXECUTABLE)) |
| ? PFERR_PRESENT_MASK : 0; |
| |
| error_code |= (exit_qualification & 0x100) != 0 ? |
| PFERR_GUEST_FINAL_MASK : PFERR_GUEST_PAGE_MASK; |
| |
| vcpu->arch.exit_qualification = exit_qualification; |
| return kvm_mmu_page_fault(vcpu, gpa, error_code, NULL, 0); |
| } |
| |
| static int handle_ept_misconfig(struct kvm_vcpu *vcpu) |
| { |
| gpa_t gpa; |
| |
| /* |
| * A nested guest cannot optimize MMIO vmexits, because we have an |
| * nGPA here instead of the required GPA. |
| */ |
| gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS); |
| if (!is_guest_mode(vcpu) && |
| !kvm_io_bus_write(vcpu, KVM_FAST_MMIO_BUS, gpa, 0, NULL)) { |
| trace_kvm_fast_mmio(gpa); |
| /* |
| * Doing kvm_skip_emulated_instruction() depends on undefined |
| * behavior: Intel's manual doesn't mandate |
| * VM_EXIT_INSTRUCTION_LEN to be set in VMCS when EPT MISCONFIG |
| * occurs and while on real hardware it was observed to be set, |
| * other hypervisors (namely Hyper-V) don't set it, we end up |
| * advancing IP with some random value. Disable fast mmio when |
| * running nested and keep it for real hardware in hope that |
| * VM_EXIT_INSTRUCTION_LEN will always be set correctly. |
| */ |
| if (!static_cpu_has(X86_FEATURE_HYPERVISOR)) |
| return kvm_skip_emulated_instruction(vcpu); |
| else |
| return kvm_emulate_instruction(vcpu, EMULTYPE_SKIP) == |
| EMULATE_DONE; |
| } |
| |
| return kvm_mmu_page_fault(vcpu, gpa, PFERR_RSVD_MASK, NULL, 0); |
| } |
| |
| static int handle_nmi_window(struct kvm_vcpu *vcpu) |
| { |
| WARN_ON_ONCE(!enable_vnmi); |
| vmcs_clear_bits(CPU_BASED_VM_EXEC_CONTROL, |
| CPU_BASED_VIRTUAL_NMI_PENDING); |
| ++vcpu->stat.nmi_window_exits; |
| kvm_make_request(KVM_REQ_EVENT, vcpu); |
| |
| return 1; |
| } |
| |
| static int handle_invalid_guest_state(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| enum emulation_result err = EMULATE_DONE; |
| int ret = 1; |
| u32 cpu_exec_ctrl; |
| bool intr_window_requested; |
| unsigned count = 130; |
| |
| /* |
| * We should never reach the point where we are emulating L2 |
| * due to invalid guest state as that means we incorrectly |
| * allowed a nested VMEntry with an invalid vmcs12. |
| */ |
| WARN_ON_ONCE(vmx->emulation_required && vmx->nested.nested_run_pending); |
| |
| cpu_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); |
| intr_window_requested = cpu_exec_ctrl & CPU_BASED_VIRTUAL_INTR_PENDING; |
| |
| while (vmx->emulation_required && count-- != 0) { |
| if (intr_window_requested && vmx_interrupt_allowed(vcpu)) |
| return handle_interrupt_window(&vmx->vcpu); |
| |
| if (kvm_test_request(KVM_REQ_EVENT, vcpu)) |
| return 1; |
| |
| err = kvm_emulate_instruction(vcpu, 0); |
| |
| if (err == EMULATE_USER_EXIT) { |
| ++vcpu->stat.mmio_exits; |
| ret = 0; |
| goto out; |
| } |
| |
| if (err != EMULATE_DONE) |
| goto emulation_error; |
| |
| if (vmx->emulation_required && !vmx->rmode.vm86_active && |
| vcpu->arch.exception.pending) |
| goto emulation_error; |
| |
| if (vcpu->arch.halt_request) { |
| vcpu->arch.halt_request = 0; |
| ret = kvm_vcpu_halt(vcpu); |
| goto out; |
| } |
| |
| if (signal_pending(current)) |
| goto out; |
| if (need_resched()) |
| schedule(); |
| } |
| |
| out: |
| return ret; |
| |
| emulation_error: |
| vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; |
| vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; |
| vcpu->run->internal.ndata = 0; |
| return 0; |
| } |
| |
| static void grow_ple_window(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| int old = vmx->ple_window; |
| |
| vmx->ple_window = __grow_ple_window(old, ple_window, |
| ple_window_grow, |
| ple_window_max); |
| |
| if (vmx->ple_window != old) |
| vmx->ple_window_dirty = true; |
| |
| trace_kvm_ple_window_grow(vcpu->vcpu_id, vmx->ple_window, old); |
| } |
| |
| static void shrink_ple_window(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| int old = vmx->ple_window; |
| |
| vmx->ple_window = __shrink_ple_window(old, ple_window, |
| ple_window_shrink, |
| ple_window); |
| |
| if (vmx->ple_window != old) |
| vmx->ple_window_dirty = true; |
| |
| trace_kvm_ple_window_shrink(vcpu->vcpu_id, vmx->ple_window, old); |
| } |
| |
| /* |
| * Handler for POSTED_INTERRUPT_WAKEUP_VECTOR. |
| */ |
| static void wakeup_handler(void) |
| { |
| struct kvm_vcpu *vcpu; |
| int cpu = smp_processor_id(); |
| |
| spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, cpu)); |
| list_for_each_entry(vcpu, &per_cpu(blocked_vcpu_on_cpu, cpu), |
| blocked_vcpu_list) { |
| struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); |
| |
| if (pi_test_on(pi_desc) == 1) |
| kvm_vcpu_kick(vcpu); |
| } |
| spin_unlock(&per_cpu(blocked_vcpu_on_cpu_lock, cpu)); |
| } |
| |
| static void vmx_enable_tdp(void) |
| { |
| kvm_mmu_set_mask_ptes(VMX_EPT_READABLE_MASK, |
| enable_ept_ad_bits ? VMX_EPT_ACCESS_BIT : 0ull, |
| enable_ept_ad_bits ? VMX_EPT_DIRTY_BIT : 0ull, |
| 0ull, VMX_EPT_EXECUTABLE_MASK, |
| cpu_has_vmx_ept_execute_only() ? 0ull : VMX_EPT_READABLE_MASK, |
| VMX_EPT_RWX_MASK, 0ull); |
| |
| ept_set_mmio_spte_mask(); |
| kvm_enable_tdp(); |
| } |
| |
| static __init int hardware_setup(void) |
| { |
| unsigned long host_bndcfgs; |
| int r = -ENOMEM, i; |
| |
| rdmsrl_safe(MSR_EFER, &host_efer); |
| |
| for (i = 0; i < ARRAY_SIZE(vmx_msr_index); ++i) |
| kvm_define_shared_msr(i, vmx_msr_index[i]); |
| |
| for (i = 0; i < VMX_BITMAP_NR; i++) { |
| vmx_bitmap[i] = (unsigned long *)__get_free_page(GFP_KERNEL); |
| if (!vmx_bitmap[i]) |
| goto out; |
| } |
| |
| memset(vmx_vmread_bitmap, 0xff, PAGE_SIZE); |
| memset(vmx_vmwrite_bitmap, 0xff, PAGE_SIZE); |
| |
| if (setup_vmcs_config(&vmcs_config) < 0) { |
| r = -EIO; |
| goto out; |
| } |
| |
| if (boot_cpu_has(X86_FEATURE_NX)) |
| kvm_enable_efer_bits(EFER_NX); |
| |
| if (boot_cpu_has(X86_FEATURE_MPX)) { |
| rdmsrl(MSR_IA32_BNDCFGS, host_bndcfgs); |
| WARN_ONCE(host_bndcfgs, "KVM: BNDCFGS in host will be lost"); |
| } |
| |
| if (!cpu_has_vmx_vpid() || !cpu_has_vmx_invvpid() || |
| !(cpu_has_vmx_invvpid_single() || cpu_has_vmx_invvpid_global())) |
| enable_vpid = 0; |
| |
| if (!cpu_has_vmx_ept() || |
| !cpu_has_vmx_ept_4levels() || |
| !cpu_has_vmx_ept_mt_wb() || |
| !cpu_has_vmx_invept_global()) |
| enable_ept = 0; |
| |
| if (!cpu_has_vmx_ept_ad_bits() || !enable_ept) |
| enable_ept_ad_bits = 0; |
| |
| if (!cpu_has_vmx_unrestricted_guest() || !enable_ept) |
| enable_unrestricted_guest = 0; |
| |
| if (!cpu_has_vmx_flexpriority()) |
| flexpriority_enabled = 0; |
| |
| if (!cpu_has_virtual_nmis()) |
| enable_vnmi = 0; |
| |
| /* |
| * set_apic_access_page_addr() is used to reload apic access |
| * page upon invalidation. No need to do anything if not |
| * using the APIC_ACCESS_ADDR VMCS field. |
| */ |
| if (!flexpriority_enabled) |
| kvm_x86_ops->set_apic_access_page_addr = NULL; |
| |
| if (!cpu_has_vmx_tpr_shadow()) |
| kvm_x86_ops->update_cr8_intercept = NULL; |
| |
| if (enable_ept && !cpu_has_vmx_ept_2m_page()) |
| kvm_disable_largepages(); |
| |
| #if IS_ENABLED(CONFIG_HYPERV) |
| if (ms_hyperv.nested_features & HV_X64_NESTED_GUEST_MAPPING_FLUSH |
| && enable_ept) |
| kvm_x86_ops->tlb_remote_flush = vmx_hv_remote_flush_tlb; |
| #endif |
| |
| if (!cpu_has_vmx_ple()) { |
| ple_gap = 0; |
| ple_window = 0; |
| ple_window_grow = 0; |
| ple_window_max = 0; |
| ple_window_shrink = 0; |
| } |
| |
| if (!cpu_has_vmx_apicv()) { |
| enable_apicv = 0; |
| kvm_x86_ops->sync_pir_to_irr = NULL; |
| } |
| |
| if (cpu_has_vmx_tsc_scaling()) { |
| kvm_has_tsc_control = true; |
| kvm_max_tsc_scaling_ratio = KVM_VMX_TSC_MULTIPLIER_MAX; |
| kvm_tsc_scaling_ratio_frac_bits = 48; |
| } |
| |
| set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */ |
| |
| if (enable_ept) |
| vmx_enable_tdp(); |
| else |
| kvm_disable_tdp(); |
| |
| if (!nested) { |
| kvm_x86_ops->get_nested_state = NULL; |
| kvm_x86_ops->set_nested_state = NULL; |
| } |
| |
| /* |
| * Only enable PML when hardware supports PML feature, and both EPT |
| * and EPT A/D bit features are enabled -- PML depends on them to work. |
| */ |
| if (!enable_ept || !enable_ept_ad_bits || !cpu_has_vmx_pml()) |
| enable_pml = 0; |
| |
| if (!enable_pml) { |
| kvm_x86_ops->slot_enable_log_dirty = NULL; |
| kvm_x86_ops->slot_disable_log_dirty = NULL; |
| kvm_x86_ops->flush_log_dirty = NULL; |
| kvm_x86_ops->enable_log_dirty_pt_masked = NULL; |
| } |
| |
| if (!cpu_has_vmx_preemption_timer()) |
| kvm_x86_ops->request_immediate_exit = __kvm_request_immediate_exit; |
| |
| if (cpu_has_vmx_preemption_timer() && enable_preemption_timer) { |
| u64 vmx_msr; |
| |
| rdmsrl(MSR_IA32_VMX_MISC, vmx_msr); |
| cpu_preemption_timer_multi = |
| vmx_msr & VMX_MISC_PREEMPTION_TIMER_RATE_MASK; |
| } else { |
| kvm_x86_ops->set_hv_timer = NULL; |
| kvm_x86_ops->cancel_hv_timer = NULL; |
| } |
| |
| if (!cpu_has_vmx_shadow_vmcs()) |
| enable_shadow_vmcs = 0; |
| if (enable_shadow_vmcs) |
| init_vmcs_shadow_fields(); |
| |
| kvm_set_posted_intr_wakeup_handler(wakeup_handler); |
| nested_vmx_setup_ctls_msrs(&vmcs_config.nested, enable_apicv); |
| |
| kvm_mce_cap_supported |= MCG_LMCE_P; |
| |
| return alloc_kvm_area(); |
| |
| out: |
| for (i = 0; i < VMX_BITMAP_NR; i++) |
| free_page((unsigned long)vmx_bitmap[i]); |
| |
| return r; |
| } |
| |
| static __exit void hardware_unsetup(void) |
| { |
| int i; |
| |
| for (i = 0; i < VMX_BITMAP_NR; i++) |
| free_page((unsigned long)vmx_bitmap[i]); |
| |
| free_kvm_area(); |
| } |
| |
| /* |
| * Indicate a busy-waiting vcpu in spinlock. We do not enable the PAUSE |
| * exiting, so only get here on cpu with PAUSE-Loop-Exiting. |
| */ |
| static int handle_pause(struct kvm_vcpu *vcpu) |
| { |
| if (!kvm_pause_in_guest(vcpu->kvm)) |
| grow_ple_window(vcpu); |
| |
| /* |
| * Intel sdm vol3 ch-25.1.3 says: The "PAUSE-loop exiting" |
| * VM-execution control is ignored if CPL > 0. OTOH, KVM |
| * never set PAUSE_EXITING and just set PLE if supported, |
| * so the vcpu must be CPL=0 if it gets a PAUSE exit. |
| */ |
| kvm_vcpu_on_spin(vcpu, true); |
| return kvm_skip_emulated_instruction(vcpu); |
| } |
| |
| static int handle_nop(struct kvm_vcpu *vcpu) |
| { |
| return kvm_skip_emulated_instruction(vcpu); |
| } |
| |
| static int handle_mwait(struct kvm_vcpu *vcpu) |
| { |
| printk_once(KERN_WARNING "kvm: MWAIT instruction emulated as NOP!\n"); |
| return handle_nop(vcpu); |
| } |
| |
| static int handle_invalid_op(struct kvm_vcpu *vcpu) |
| { |
| kvm_queue_exception(vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| static int handle_monitor_trap(struct kvm_vcpu *vcpu) |
| { |
| return 1; |
| } |
| |
| static int handle_monitor(struct kvm_vcpu *vcpu) |
| { |
| printk_once(KERN_WARNING "kvm: MONITOR instruction emulated as NOP!\n"); |
| return handle_nop(vcpu); |
| } |
| |
| /* |
| * The following 3 functions, nested_vmx_succeed()/failValid()/failInvalid(), |
| * set the success or error code of an emulated VMX instruction (as specified |
| * by Vol 2B, VMX Instruction Reference, "Conventions"), and skip the emulated |
| * instruction. |
| */ |
| static int nested_vmx_succeed(struct kvm_vcpu *vcpu) |
| { |
| vmx_set_rflags(vcpu, vmx_get_rflags(vcpu) |
| & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF | |
| X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF)); |
| return kvm_skip_emulated_instruction(vcpu); |
| } |
| |
| static int nested_vmx_failInvalid(struct kvm_vcpu *vcpu) |
| { |
| vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu) |
| & ~(X86_EFLAGS_PF | X86_EFLAGS_AF | X86_EFLAGS_ZF | |
| X86_EFLAGS_SF | X86_EFLAGS_OF)) |
| | X86_EFLAGS_CF); |
| return kvm_skip_emulated_instruction(vcpu); |
| } |
| |
| static int nested_vmx_failValid(struct kvm_vcpu *vcpu, |
| u32 vm_instruction_error) |
| { |
| /* |
| * failValid writes the error number to the current VMCS, which |
| * can't be done if there isn't a current VMCS. |
| */ |
| if (to_vmx(vcpu)->nested.current_vmptr == -1ull) |
| return nested_vmx_failInvalid(vcpu); |
| |
| vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu) |
| & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF | |
| X86_EFLAGS_SF | X86_EFLAGS_OF)) |
| | X86_EFLAGS_ZF); |
| get_vmcs12(vcpu)->vm_instruction_error = vm_instruction_error; |
| /* |
| * We don't need to force a shadow sync because |
| * VM_INSTRUCTION_ERROR is not shadowed |
| */ |
| return kvm_skip_emulated_instruction(vcpu); |
| } |
| |
| static void nested_vmx_abort(struct kvm_vcpu *vcpu, u32 indicator) |
| { |
| /* TODO: not to reset guest simply here. */ |
| kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); |
| pr_debug_ratelimited("kvm: nested vmx abort, indicator %d\n", indicator); |
| } |
| |
| static enum hrtimer_restart vmx_preemption_timer_fn(struct hrtimer *timer) |
| { |
| struct vcpu_vmx *vmx = |
| container_of(timer, struct vcpu_vmx, nested.preemption_timer); |
| |
| vmx->nested.preemption_timer_expired = true; |
| kvm_make_request(KVM_REQ_EVENT, &vmx->vcpu); |
| kvm_vcpu_kick(&vmx->vcpu); |
| |
| return HRTIMER_NORESTART; |
| } |
| |
| /* |
| * Decode the memory-address operand of a vmx instruction, as recorded on an |
| * exit caused by such an instruction (run by a guest hypervisor). |
| * On success, returns 0. When the operand is invalid, returns 1 and throws |
| * #UD or #GP. |
| */ |
| static int get_vmx_mem_address(struct kvm_vcpu *vcpu, |
| unsigned long exit_qualification, |
| u32 vmx_instruction_info, bool wr, gva_t *ret) |
| { |
| gva_t off; |
| bool exn; |
| struct kvm_segment s; |
| |
| /* |
| * According to Vol. 3B, "Information for VM Exits Due to Instruction |
| * Execution", on an exit, vmx_instruction_info holds most of the |
| * addressing components of the operand. Only the displacement part |
| * is put in exit_qualification (see 3B, "Basic VM-Exit Information"). |
| * For how an actual address is calculated from all these components, |
| * refer to Vol. 1, "Operand Addressing". |
| */ |
| int scaling = vmx_instruction_info & 3; |
| int addr_size = (vmx_instruction_info >> 7) & 7; |
| bool is_reg = vmx_instruction_info & (1u << 10); |
| int seg_reg = (vmx_instruction_info >> 15) & 7; |
| int index_reg = (vmx_instruction_info >> 18) & 0xf; |
| bool index_is_valid = !(vmx_instruction_info & (1u << 22)); |
| int base_reg = (vmx_instruction_info >> 23) & 0xf; |
| bool base_is_valid = !(vmx_instruction_info & (1u << 27)); |
| |
| if (is_reg) { |
| kvm_queue_exception(vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| /* Addr = segment_base + offset */ |
| /* offset = base + [index * scale] + displacement */ |
| off = exit_qualification; /* holds the displacement */ |
| if (base_is_valid) |
| off += kvm_register_read(vcpu, base_reg); |
| if (index_is_valid) |
| off += kvm_register_read(vcpu, index_reg)<<scaling; |
| vmx_get_segment(vcpu, &s, seg_reg); |
| *ret = s.base + off; |
| |
| if (addr_size == 1) /* 32 bit */ |
| *ret &= 0xffffffff; |
| |
| /* Checks for #GP/#SS exceptions. */ |
| exn = false; |
| if (is_long_mode(vcpu)) { |
| /* Long mode: #GP(0)/#SS(0) if the memory address is in a |
| * non-canonical form. This is the only check on the memory |
| * destination for long mode! |
| */ |
| exn = is_noncanonical_address(*ret, vcpu); |
| } else if (is_protmode(vcpu)) { |
| /* Protected mode: apply checks for segment validity in the |
| * following order: |
| * - segment type check (#GP(0) may be thrown) |
| * - usability check (#GP(0)/#SS(0)) |
| * - limit check (#GP(0)/#SS(0)) |
| */ |
| if (wr) |
| /* #GP(0) if the destination operand is located in a |
| * read-only data segment or any code segment. |
| */ |
| exn = ((s.type & 0xa) == 0 || (s.type & 8)); |
| else |
| /* #GP(0) if the source operand is located in an |
| * execute-only code segment |
| */ |
| exn = ((s.type & 0xa) == 8); |
| if (exn) { |
| kvm_queue_exception_e(vcpu, GP_VECTOR, 0); |
| return 1; |
| } |
| /* Protected mode: #GP(0)/#SS(0) if the segment is unusable. |
| */ |
| exn = (s.unusable != 0); |
| /* Protected mode: #GP(0)/#SS(0) if the memory |
| * operand is outside the segment limit. |
| */ |
| exn = exn || (off + sizeof(u64) > s.limit); |
| } |
| if (exn) { |
| kvm_queue_exception_e(vcpu, |
| seg_reg == VCPU_SREG_SS ? |
| SS_VECTOR : GP_VECTOR, |
| 0); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static int nested_vmx_get_vmptr(struct kvm_vcpu *vcpu, gpa_t *vmpointer) |
| { |
| gva_t gva; |
| struct x86_exception e; |
| |
| if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION), |
| vmcs_read32(VMX_INSTRUCTION_INFO), false, &gva)) |
| return 1; |
| |
| if (kvm_read_guest_virt(vcpu, gva, vmpointer, sizeof(*vmpointer), &e)) { |
| kvm_inject_page_fault(vcpu, &e); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Allocate a shadow VMCS and associate it with the currently loaded |
| * VMCS, unless such a shadow VMCS already exists. The newly allocated |
| * VMCS is also VMCLEARed, so that it is ready for use. |
| */ |
| static struct vmcs *alloc_shadow_vmcs(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct loaded_vmcs *loaded_vmcs = vmx->loaded_vmcs; |
| |
| /* |
| * We should allocate a shadow vmcs for vmcs01 only when L1 |
| * executes VMXON and free it when L1 executes VMXOFF. |
| * As it is invalid to execute VMXON twice, we shouldn't reach |
| * here when vmcs01 already have an allocated shadow vmcs. |
| */ |
| WARN_ON(loaded_vmcs == &vmx->vmcs01 && loaded_vmcs->shadow_vmcs); |
| |
| if (!loaded_vmcs->shadow_vmcs) { |
| loaded_vmcs->shadow_vmcs = alloc_vmcs(true); |
| if (loaded_vmcs->shadow_vmcs) |
| vmcs_clear(loaded_vmcs->shadow_vmcs); |
| } |
| return loaded_vmcs->shadow_vmcs; |
| } |
| |
| static int enter_vmx_operation(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| int r; |
| |
| r = alloc_loaded_vmcs(&vmx->nested.vmcs02); |
| if (r < 0) |
| goto out_vmcs02; |
| |
| vmx->nested.cached_vmcs12 = kmalloc(VMCS12_SIZE, GFP_KERNEL); |
| if (!vmx->nested.cached_vmcs12) |
| goto out_cached_vmcs12; |
| |
| vmx->nested.cached_shadow_vmcs12 = kmalloc(VMCS12_SIZE, GFP_KERNEL); |
| if (!vmx->nested.cached_shadow_vmcs12) |
| goto out_cached_shadow_vmcs12; |
| |
| if (enable_shadow_vmcs && !alloc_shadow_vmcs(vcpu)) |
| goto out_shadow_vmcs; |
| |
| hrtimer_init(&vmx->nested.preemption_timer, CLOCK_MONOTONIC, |
| HRTIMER_MODE_REL_PINNED); |
| vmx->nested.preemption_timer.function = vmx_preemption_timer_fn; |
| |
| vmx->nested.vpid02 = allocate_vpid(); |
| |
| vmx->nested.vmcs02_initialized = false; |
| vmx->nested.vmxon = true; |
| return 0; |
| |
| out_shadow_vmcs: |
| kfree(vmx->nested.cached_shadow_vmcs12); |
| |
| out_cached_shadow_vmcs12: |
| kfree(vmx->nested.cached_vmcs12); |
| |
| out_cached_vmcs12: |
| free_loaded_vmcs(&vmx->nested.vmcs02); |
| |
| out_vmcs02: |
| return -ENOMEM; |
| } |
| |
| /* |
| * Emulate the VMXON instruction. |
| * Currently, we just remember that VMX is active, and do not save or even |
| * inspect the argument to VMXON (the so-called "VMXON pointer") because we |
| * do not currently need to store anything in that guest-allocated memory |
| * region. Consequently, VMCLEAR and VMPTRLD also do not verify that the their |
| * argument is different from the VMXON pointer (which the spec says they do). |
| */ |
| static int handle_vmon(struct kvm_vcpu *vcpu) |
| { |
| int ret; |
| gpa_t vmptr; |
| struct page *page; |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| const u64 VMXON_NEEDED_FEATURES = FEATURE_CONTROL_LOCKED |
| | FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX; |
| |
| /* |
| * The Intel VMX Instruction Reference lists a bunch of bits that are |
| * prerequisite to running VMXON, most notably cr4.VMXE must be set to |
| * 1 (see vmx_set_cr4() for when we allow the guest to set this). |
| * Otherwise, we should fail with #UD. But most faulting conditions |
| * have already been checked by hardware, prior to the VM-exit for |
| * VMXON. We do test guest cr4.VMXE because processor CR4 always has |
| * that bit set to 1 in non-root mode. |
| */ |
| if (!kvm_read_cr4_bits(vcpu, X86_CR4_VMXE)) { |
| kvm_queue_exception(vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| /* CPL=0 must be checked manually. */ |
| if (vmx_get_cpl(vcpu)) { |
| kvm_inject_gp(vcpu, 0); |
| return 1; |
| } |
| |
| if (vmx->nested.vmxon) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_VMXON_IN_VMX_ROOT_OPERATION); |
| |
| if ((vmx->msr_ia32_feature_control & VMXON_NEEDED_FEATURES) |
| != VMXON_NEEDED_FEATURES) { |
| kvm_inject_gp(vcpu, 0); |
| return 1; |
| } |
| |
| if (nested_vmx_get_vmptr(vcpu, &vmptr)) |
| return 1; |
| |
| /* |
| * SDM 3: 24.11.5 |
| * The first 4 bytes of VMXON region contain the supported |
| * VMCS revision identifier |
| * |
| * Note - IA32_VMX_BASIC[48] will never be 1 for the nested case; |
| * which replaces physical address width with 32 |
| */ |
| if (!PAGE_ALIGNED(vmptr) || (vmptr >> cpuid_maxphyaddr(vcpu))) |
| return nested_vmx_failInvalid(vcpu); |
| |
| page = kvm_vcpu_gpa_to_page(vcpu, vmptr); |
| if (is_error_page(page)) |
| return nested_vmx_failInvalid(vcpu); |
| |
| if (*(u32 *)kmap(page) != VMCS12_REVISION) { |
| kunmap(page); |
| kvm_release_page_clean(page); |
| return nested_vmx_failInvalid(vcpu); |
| } |
| kunmap(page); |
| kvm_release_page_clean(page); |
| |
| vmx->nested.vmxon_ptr = vmptr; |
| ret = enter_vmx_operation(vcpu); |
| if (ret) |
| return ret; |
| |
| return nested_vmx_succeed(vcpu); |
| } |
| |
| /* |
| * Intel's VMX Instruction Reference specifies a common set of prerequisites |
| * for running VMX instructions (except VMXON, whose prerequisites are |
| * slightly different). It also specifies what exception to inject otherwise. |
| * Note that many of these exceptions have priority over VM exits, so they |
| * don't have to be checked again here. |
| */ |
| static int nested_vmx_check_permission(struct kvm_vcpu *vcpu) |
| { |
| if (!to_vmx(vcpu)->nested.vmxon) { |
| kvm_queue_exception(vcpu, UD_VECTOR); |
| return 0; |
| } |
| |
| if (vmx_get_cpl(vcpu)) { |
| kvm_inject_gp(vcpu, 0); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static void vmx_disable_shadow_vmcs(struct vcpu_vmx *vmx) |
| { |
| vmcs_clear_bits(SECONDARY_VM_EXEC_CONTROL, SECONDARY_EXEC_SHADOW_VMCS); |
| vmcs_write64(VMCS_LINK_POINTER, -1ull); |
| } |
| |
| static inline void nested_release_vmcs12(struct vcpu_vmx *vmx) |
| { |
| if (vmx->nested.current_vmptr == -1ull) |
| return; |
| |
| if (enable_shadow_vmcs) { |
| /* copy to memory all shadowed fields in case |
| they were modified */ |
| copy_shadow_to_vmcs12(vmx); |
| vmx->nested.sync_shadow_vmcs = false; |
| vmx_disable_shadow_vmcs(vmx); |
| } |
| vmx->nested.posted_intr_nv = -1; |
| |
| /* Flush VMCS12 to guest memory */ |
| kvm_vcpu_write_guest_page(&vmx->vcpu, |
| vmx->nested.current_vmptr >> PAGE_SHIFT, |
| vmx->nested.cached_vmcs12, 0, VMCS12_SIZE); |
| |
| vmx->nested.current_vmptr = -1ull; |
| } |
| |
| /* |
| * Free whatever needs to be freed from vmx->nested when L1 goes down, or |
| * just stops using VMX. |
| */ |
| static void free_nested(struct vcpu_vmx *vmx) |
| { |
| if (!vmx->nested.vmxon && !vmx->nested.smm.vmxon) |
| return; |
| |
| vmx->nested.vmxon = false; |
| vmx->nested.smm.vmxon = false; |
| free_vpid(vmx->nested.vpid02); |
| vmx->nested.posted_intr_nv = -1; |
| vmx->nested.current_vmptr = -1ull; |
| if (enable_shadow_vmcs) { |
| vmx_disable_shadow_vmcs(vmx); |
| vmcs_clear(vmx->vmcs01.shadow_vmcs); |
| free_vmcs(vmx->vmcs01.shadow_vmcs); |
| vmx->vmcs01.shadow_vmcs = NULL; |
| } |
| kfree(vmx->nested.cached_vmcs12); |
| kfree(vmx->nested.cached_shadow_vmcs12); |
| /* Unpin physical memory we referred to in the vmcs02 */ |
| if (vmx->nested.apic_access_page) { |
| kvm_release_page_dirty(vmx->nested.apic_access_page); |
| vmx->nested.apic_access_page = NULL; |
| } |
| if (vmx->nested.virtual_apic_page) { |
| kvm_release_page_dirty(vmx->nested.virtual_apic_page); |
| vmx->nested.virtual_apic_page = NULL; |
| } |
| if (vmx->nested.pi_desc_page) { |
| kunmap(vmx->nested.pi_desc_page); |
| kvm_release_page_dirty(vmx->nested.pi_desc_page); |
| vmx->nested.pi_desc_page = NULL; |
| vmx->nested.pi_desc = NULL; |
| } |
| |
| free_loaded_vmcs(&vmx->nested.vmcs02); |
| } |
| |
| /* Emulate the VMXOFF instruction */ |
| static int handle_vmoff(struct kvm_vcpu *vcpu) |
| { |
| if (!nested_vmx_check_permission(vcpu)) |
| return 1; |
| free_nested(to_vmx(vcpu)); |
| return nested_vmx_succeed(vcpu); |
| } |
| |
| /* Emulate the VMCLEAR instruction */ |
| static int handle_vmclear(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| u32 zero = 0; |
| gpa_t vmptr; |
| |
| if (!nested_vmx_check_permission(vcpu)) |
| return 1; |
| |
| if (nested_vmx_get_vmptr(vcpu, &vmptr)) |
| return 1; |
| |
| if (!PAGE_ALIGNED(vmptr) || (vmptr >> cpuid_maxphyaddr(vcpu))) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_VMCLEAR_INVALID_ADDRESS); |
| |
| if (vmptr == vmx->nested.vmxon_ptr) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_VMCLEAR_VMXON_POINTER); |
| |
| if (vmptr == vmx->nested.current_vmptr) |
| nested_release_vmcs12(vmx); |
| |
| kvm_vcpu_write_guest(vcpu, |
| vmptr + offsetof(struct vmcs12, launch_state), |
| &zero, sizeof(zero)); |
| |
| return nested_vmx_succeed(vcpu); |
| } |
| |
| static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch); |
| |
| /* Emulate the VMLAUNCH instruction */ |
| static int handle_vmlaunch(struct kvm_vcpu *vcpu) |
| { |
| return nested_vmx_run(vcpu, true); |
| } |
| |
| /* Emulate the VMRESUME instruction */ |
| static int handle_vmresume(struct kvm_vcpu *vcpu) |
| { |
| |
| return nested_vmx_run(vcpu, false); |
| } |
| |
| /* |
| * Read a vmcs12 field. Since these can have varying lengths and we return |
| * one type, we chose the biggest type (u64) and zero-extend the return value |
| * to that size. Note that the caller, handle_vmread, might need to use only |
| * some of the bits we return here (e.g., on 32-bit guests, only 32 bits of |
| * 64-bit fields are to be returned). |
| */ |
| static inline int vmcs12_read_any(struct vmcs12 *vmcs12, |
| unsigned long field, u64 *ret) |
| { |
| short offset = vmcs_field_to_offset(field); |
| char *p; |
| |
| if (offset < 0) |
| return offset; |
| |
| p = (char *)vmcs12 + offset; |
| |
| switch (vmcs_field_width(field)) { |
| case VMCS_FIELD_WIDTH_NATURAL_WIDTH: |
| *ret = *((natural_width *)p); |
| return 0; |
| case VMCS_FIELD_WIDTH_U16: |
| *ret = *((u16 *)p); |
| return 0; |
| case VMCS_FIELD_WIDTH_U32: |
| *ret = *((u32 *)p); |
| return 0; |
| case VMCS_FIELD_WIDTH_U64: |
| *ret = *((u64 *)p); |
| return 0; |
| default: |
| WARN_ON(1); |
| return -ENOENT; |
| } |
| } |
| |
| |
| static inline int vmcs12_write_any(struct vmcs12 *vmcs12, |
| unsigned long field, u64 field_value){ |
| short offset = vmcs_field_to_offset(field); |
| char *p = (char *)vmcs12 + offset; |
| if (offset < 0) |
| return offset; |
| |
| switch (vmcs_field_width(field)) { |
| case VMCS_FIELD_WIDTH_U16: |
| *(u16 *)p = field_value; |
| return 0; |
| case VMCS_FIELD_WIDTH_U32: |
| *(u32 *)p = field_value; |
| return 0; |
| case VMCS_FIELD_WIDTH_U64: |
| *(u64 *)p = field_value; |
| return 0; |
| case VMCS_FIELD_WIDTH_NATURAL_WIDTH: |
| *(natural_width *)p = field_value; |
| return 0; |
| default: |
| WARN_ON(1); |
| return -ENOENT; |
| } |
| |
| } |
| |
| /* |
| * Copy the writable VMCS shadow fields back to the VMCS12, in case |
| * they have been modified by the L1 guest. Note that the "read-only" |
| * VM-exit information fields are actually writable if the vCPU is |
| * configured to support "VMWRITE to any supported field in the VMCS." |
| */ |
| static void copy_shadow_to_vmcs12(struct vcpu_vmx *vmx) |
| { |
| const u16 *fields[] = { |
| shadow_read_write_fields, |
| shadow_read_only_fields |
| }; |
| const int max_fields[] = { |
| max_shadow_read_write_fields, |
| max_shadow_read_only_fields |
| }; |
| int i, q; |
| unsigned long field; |
| u64 field_value; |
| struct vmcs *shadow_vmcs = vmx->vmcs01.shadow_vmcs; |
| |
| preempt_disable(); |
| |
| vmcs_load(shadow_vmcs); |
| |
| for (q = 0; q < ARRAY_SIZE(fields); q++) { |
| for (i = 0; i < max_fields[q]; i++) { |
| field = fields[q][i]; |
| field_value = __vmcs_readl(field); |
| vmcs12_write_any(get_vmcs12(&vmx->vcpu), field, field_value); |
| } |
| /* |
| * Skip the VM-exit information fields if they are read-only. |
| */ |
| if (!nested_cpu_has_vmwrite_any_field(&vmx->vcpu)) |
| break; |
| } |
| |
| vmcs_clear(shadow_vmcs); |
| vmcs_load(vmx->loaded_vmcs->vmcs); |
| |
| preempt_enable(); |
| } |
| |
| static void copy_vmcs12_to_shadow(struct vcpu_vmx *vmx) |
| { |
| const u16 *fields[] = { |
| shadow_read_write_fields, |
| shadow_read_only_fields |
| }; |
| const int max_fields[] = { |
| max_shadow_read_write_fields, |
| max_shadow_read_only_fields |
| }; |
| int i, q; |
| unsigned long field; |
| u64 field_value = 0; |
| struct vmcs *shadow_vmcs = vmx->vmcs01.shadow_vmcs; |
| |
| vmcs_load(shadow_vmcs); |
| |
| for (q = 0; q < ARRAY_SIZE(fields); q++) { |
| for (i = 0; i < max_fields[q]; i++) { |
| field = fields[q][i]; |
| vmcs12_read_any(get_vmcs12(&vmx->vcpu), field, &field_value); |
| __vmcs_writel(field, field_value); |
| } |
| } |
| |
| vmcs_clear(shadow_vmcs); |
| vmcs_load(vmx->loaded_vmcs->vmcs); |
| } |
| |
| static int handle_vmread(struct kvm_vcpu *vcpu) |
| { |
| unsigned long field; |
| u64 field_value; |
| unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); |
| gva_t gva = 0; |
| struct vmcs12 *vmcs12; |
| |
| if (!nested_vmx_check_permission(vcpu)) |
| return 1; |
| |
| if (to_vmx(vcpu)->nested.current_vmptr == -1ull) |
| return nested_vmx_failInvalid(vcpu); |
| |
| if (!is_guest_mode(vcpu)) |
| vmcs12 = get_vmcs12(vcpu); |
| else { |
| /* |
| * When vmcs->vmcs_link_pointer is -1ull, any VMREAD |
| * to shadowed-field sets the ALU flags for VMfailInvalid. |
| */ |
| if (get_vmcs12(vcpu)->vmcs_link_pointer == -1ull) |
| return nested_vmx_failInvalid(vcpu); |
| vmcs12 = get_shadow_vmcs12(vcpu); |
| } |
| |
| /* Decode instruction info and find the field to read */ |
| field = kvm_register_readl(vcpu, (((vmx_instruction_info) >> 28) & 0xf)); |
| /* Read the field, zero-extended to a u64 field_value */ |
| if (vmcs12_read_any(vmcs12, field, &field_value) < 0) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_UNSUPPORTED_VMCS_COMPONENT); |
| |
| /* |
| * Now copy part of this value to register or memory, as requested. |
| * Note that the number of bits actually copied is 32 or 64 depending |
| * on the guest's mode (32 or 64 bit), not on the given field's length. |
| */ |
| if (vmx_instruction_info & (1u << 10)) { |
| kvm_register_writel(vcpu, (((vmx_instruction_info) >> 3) & 0xf), |
| field_value); |
| } else { |
| if (get_vmx_mem_address(vcpu, exit_qualification, |
| vmx_instruction_info, true, &gva)) |
| return 1; |
| /* _system ok, nested_vmx_check_permission has verified cpl=0 */ |
| kvm_write_guest_virt_system(vcpu, gva, &field_value, |
| (is_long_mode(vcpu) ? 8 : 4), NULL); |
| } |
| |
| return nested_vmx_succeed(vcpu); |
| } |
| |
| |
| static int handle_vmwrite(struct kvm_vcpu *vcpu) |
| { |
| unsigned long field; |
| gva_t gva; |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); |
| |
| /* The value to write might be 32 or 64 bits, depending on L1's long |
| * mode, and eventually we need to write that into a field of several |
| * possible lengths. The code below first zero-extends the value to 64 |
| * bit (field_value), and then copies only the appropriate number of |
| * bits into the vmcs12 field. |
| */ |
| u64 field_value = 0; |
| struct x86_exception e; |
| struct vmcs12 *vmcs12; |
| |
| if (!nested_vmx_check_permission(vcpu)) |
| return 1; |
| |
| if (vmx->nested.current_vmptr == -1ull) |
| return nested_vmx_failInvalid(vcpu); |
| |
| if (vmx_instruction_info & (1u << 10)) |
| field_value = kvm_register_readl(vcpu, |
| (((vmx_instruction_info) >> 3) & 0xf)); |
| else { |
| if (get_vmx_mem_address(vcpu, exit_qualification, |
| vmx_instruction_info, false, &gva)) |
| return 1; |
| if (kvm_read_guest_virt(vcpu, gva, &field_value, |
| (is_64_bit_mode(vcpu) ? 8 : 4), &e)) { |
| kvm_inject_page_fault(vcpu, &e); |
| return 1; |
| } |
| } |
| |
| |
| field = kvm_register_readl(vcpu, (((vmx_instruction_info) >> 28) & 0xf)); |
| /* |
| * If the vCPU supports "VMWRITE to any supported field in the |
| * VMCS," then the "read-only" fields are actually read/write. |
| */ |
| if (vmcs_field_readonly(field) && |
| !nested_cpu_has_vmwrite_any_field(vcpu)) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_VMWRITE_READ_ONLY_VMCS_COMPONENT); |
| |
| if (!is_guest_mode(vcpu)) |
| vmcs12 = get_vmcs12(vcpu); |
| else { |
| /* |
| * When vmcs->vmcs_link_pointer is -1ull, any VMWRITE |
| * to shadowed-field sets the ALU flags for VMfailInvalid. |
| */ |
| if (get_vmcs12(vcpu)->vmcs_link_pointer == -1ull) |
| return nested_vmx_failInvalid(vcpu); |
| vmcs12 = get_shadow_vmcs12(vcpu); |
| } |
| |
| if (vmcs12_write_any(vmcs12, field, field_value) < 0) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_UNSUPPORTED_VMCS_COMPONENT); |
| |
| /* |
| * Do not track vmcs12 dirty-state if in guest-mode |
| * as we actually dirty shadow vmcs12 instead of vmcs12. |
| */ |
| if (!is_guest_mode(vcpu)) { |
| switch (field) { |
| #define SHADOW_FIELD_RW(x) case x: |
| #include "vmx_shadow_fields.h" |
| /* |
| * The fields that can be updated by L1 without a vmexit are |
| * always updated in the vmcs02, the others go down the slow |
| * path of prepare_vmcs02. |
| */ |
| break; |
| default: |
| vmx->nested.dirty_vmcs12 = true; |
| break; |
| } |
| } |
| |
| return nested_vmx_succeed(vcpu); |
| } |
| |
| static void set_current_vmptr(struct vcpu_vmx *vmx, gpa_t vmptr) |
| { |
| vmx->nested.current_vmptr = vmptr; |
| if (enable_shadow_vmcs) { |
| vmcs_set_bits(SECONDARY_VM_EXEC_CONTROL, |
| SECONDARY_EXEC_SHADOW_VMCS); |
| vmcs_write64(VMCS_LINK_POINTER, |
| __pa(vmx->vmcs01.shadow_vmcs)); |
| vmx->nested.sync_shadow_vmcs = true; |
| } |
| vmx->nested.dirty_vmcs12 = true; |
| } |
| |
| /* Emulate the VMPTRLD instruction */ |
| static int handle_vmptrld(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| gpa_t vmptr; |
| |
| if (!nested_vmx_check_permission(vcpu)) |
| return 1; |
| |
| if (nested_vmx_get_vmptr(vcpu, &vmptr)) |
| return 1; |
| |
| if (!PAGE_ALIGNED(vmptr) || (vmptr >> cpuid_maxphyaddr(vcpu))) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_VMPTRLD_INVALID_ADDRESS); |
| |
| if (vmptr == vmx->nested.vmxon_ptr) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_VMPTRLD_VMXON_POINTER); |
| |
| if (vmx->nested.current_vmptr != vmptr) { |
| struct vmcs12 *new_vmcs12; |
| struct page *page; |
| page = kvm_vcpu_gpa_to_page(vcpu, vmptr); |
| if (is_error_page(page)) |
| return nested_vmx_failInvalid(vcpu); |
| |
| new_vmcs12 = kmap(page); |
| if (new_vmcs12->hdr.revision_id != VMCS12_REVISION || |
| (new_vmcs12->hdr.shadow_vmcs && |
| !nested_cpu_has_vmx_shadow_vmcs(vcpu))) { |
| kunmap(page); |
| kvm_release_page_clean(page); |
| return nested_vmx_failValid(vcpu, |
| VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID); |
| } |
| |
| nested_release_vmcs12(vmx); |
| /* |
| * Load VMCS12 from guest memory since it is not already |
| * cached. |
| */ |
| memcpy(vmx->nested.cached_vmcs12, new_vmcs12, VMCS12_SIZE); |
| kunmap(page); |
| kvm_release_page_clean(page); |
| |
| set_current_vmptr(vmx, vmptr); |
| } |
| |
| return nested_vmx_succeed(vcpu); |
| } |
| |
| /* Emulate the VMPTRST instruction */ |
| static int handle_vmptrst(struct kvm_vcpu *vcpu) |
| { |
| unsigned long exit_qual = vmcs_readl(EXIT_QUALIFICATION); |
| u32 instr_info = vmcs_read32(VMX_INSTRUCTION_INFO); |
| gpa_t current_vmptr = to_vmx(vcpu)->nested.current_vmptr; |
| struct x86_exception e; |
| gva_t gva; |
| |
| if (!nested_vmx_check_permission(vcpu)) |
| return 1; |
| |
| if (get_vmx_mem_address(vcpu, exit_qual, instr_info, true, &gva)) |
| return 1; |
| /* *_system ok, nested_vmx_check_permission has verified cpl=0 */ |
| if (kvm_write_guest_virt_system(vcpu, gva, (void *)¤t_vmptr, |
| sizeof(gpa_t), &e)) { |
| kvm_inject_page_fault(vcpu, &e); |
| return 1; |
| } |
| return nested_vmx_succeed(vcpu); |
| } |
| |
| /* Emulate the INVEPT instruction */ |
| static int handle_invept(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| u32 vmx_instruction_info, types; |
| unsigned long type; |
| gva_t gva; |
| struct x86_exception e; |
| struct { |
| u64 eptp, gpa; |
| } operand; |
| |
| if (!(vmx->nested.msrs.secondary_ctls_high & |
| SECONDARY_EXEC_ENABLE_EPT) || |
| !(vmx->nested.msrs.ept_caps & VMX_EPT_INVEPT_BIT)) { |
| kvm_queue_exception(vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| if (!nested_vmx_check_permission(vcpu)) |
| return 1; |
| |
| vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); |
| type = kvm_register_readl(vcpu, (vmx_instruction_info >> 28) & 0xf); |
| |
| types = (vmx->nested.msrs.ept_caps >> VMX_EPT_EXTENT_SHIFT) & 6; |
| |
| if (type >= 32 || !(types & (1 << type))) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID); |
| |
| /* According to the Intel VMX instruction reference, the memory |
| * operand is read even if it isn't needed (e.g., for type==global) |
| */ |
| if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION), |
| vmx_instruction_info, false, &gva)) |
| return 1; |
| if (kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e)) { |
| kvm_inject_page_fault(vcpu, &e); |
| return 1; |
| } |
| |
| switch (type) { |
| case VMX_EPT_EXTENT_GLOBAL: |
| /* |
| * TODO: track mappings and invalidate |
| * single context requests appropriately |
| */ |
| case VMX_EPT_EXTENT_CONTEXT: |
| kvm_mmu_sync_roots(vcpu); |
| kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
| break; |
| default: |
| BUG_ON(1); |
| break; |
| } |
| |
| return nested_vmx_succeed(vcpu); |
| } |
| |
| static u16 nested_get_vpid02(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| return vmx->nested.vpid02 ? vmx->nested.vpid02 : vmx->vpid; |
| } |
| |
| static int handle_invvpid(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| u32 vmx_instruction_info; |
| unsigned long type, types; |
| gva_t gva; |
| struct x86_exception e; |
| struct { |
| u64 vpid; |
| u64 gla; |
| } operand; |
| u16 vpid02; |
| |
| if (!(vmx->nested.msrs.secondary_ctls_high & |
| SECONDARY_EXEC_ENABLE_VPID) || |
| !(vmx->nested.msrs.vpid_caps & VMX_VPID_INVVPID_BIT)) { |
| kvm_queue_exception(vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| if (!nested_vmx_check_permission(vcpu)) |
| return 1; |
| |
| vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); |
| type = kvm_register_readl(vcpu, (vmx_instruction_info >> 28) & 0xf); |
| |
| types = (vmx->nested.msrs.vpid_caps & |
| VMX_VPID_EXTENT_SUPPORTED_MASK) >> 8; |
| |
| if (type >= 32 || !(types & (1 << type))) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID); |
| |
| /* according to the intel vmx instruction reference, the memory |
| * operand is read even if it isn't needed (e.g., for type==global) |
| */ |
| if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION), |
| vmx_instruction_info, false, &gva)) |
| return 1; |
| if (kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e)) { |
| kvm_inject_page_fault(vcpu, &e); |
| return 1; |
| } |
| if (operand.vpid >> 16) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID); |
| |
| vpid02 = nested_get_vpid02(vcpu); |
| switch (type) { |
| case VMX_VPID_EXTENT_INDIVIDUAL_ADDR: |
| if (!operand.vpid || |
| is_noncanonical_address(operand.gla, vcpu)) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID); |
| if (cpu_has_vmx_invvpid_individual_addr()) { |
| __invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, |
| vpid02, operand.gla); |
| } else |
| __vmx_flush_tlb(vcpu, vpid02, false); |
| break; |
| case VMX_VPID_EXTENT_SINGLE_CONTEXT: |
| case VMX_VPID_EXTENT_SINGLE_NON_GLOBAL: |
| if (!operand.vpid) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID); |
| __vmx_flush_tlb(vcpu, vpid02, false); |
| break; |
| case VMX_VPID_EXTENT_ALL_CONTEXT: |
| __vmx_flush_tlb(vcpu, vpid02, false); |
| break; |
| default: |
| WARN_ON_ONCE(1); |
| return kvm_skip_emulated_instruction(vcpu); |
| } |
| |
| return nested_vmx_succeed(vcpu); |
| } |
| |
| static int handle_invpcid(struct kvm_vcpu *vcpu) |
| { |
| u32 vmx_instruction_info; |
| unsigned long type; |
| bool pcid_enabled; |
| gva_t gva; |
| struct x86_exception e; |
| unsigned i; |
| unsigned long roots_to_free = 0; |
| struct { |
| u64 pcid; |
| u64 gla; |
| } operand; |
| |
| if (!guest_cpuid_has(vcpu, X86_FEATURE_INVPCID)) { |
| kvm_queue_exception(vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); |
| type = kvm_register_readl(vcpu, (vmx_instruction_info >> 28) & 0xf); |
| |
| if (type > 3) { |
| kvm_inject_gp(vcpu, 0); |
| return 1; |
| } |
| |
| /* According to the Intel instruction reference, the memory operand |
| * is read even if it isn't needed (e.g., for type==all) |
| */ |
| if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION), |
| vmx_instruction_info, false, &gva)) |
| return 1; |
| |
| if (kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e)) { |
| kvm_inject_page_fault(vcpu, &e); |
| return 1; |
| } |
| |
| if (operand.pcid >> 12 != 0) { |
| kvm_inject_gp(vcpu, 0); |
| return 1; |
| } |
| |
| pcid_enabled = kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE); |
| |
| switch (type) { |
| case INVPCID_TYPE_INDIV_ADDR: |
| if ((!pcid_enabled && (operand.pcid != 0)) || |
| is_noncanonical_address(operand.gla, vcpu)) { |
| kvm_inject_gp(vcpu, 0); |
| return 1; |
| } |
| kvm_mmu_invpcid_gva(vcpu, operand.gla, operand.pcid); |
| return kvm_skip_emulated_instruction(vcpu); |
| |
| case INVPCID_TYPE_SINGLE_CTXT: |
| if (!pcid_enabled && (operand.pcid != 0)) { |
| kvm_inject_gp(vcpu, 0); |
| return 1; |
| } |
| |
| if (kvm_get_active_pcid(vcpu) == operand.pcid) { |
| kvm_mmu_sync_roots(vcpu); |
| kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
| } |
| |
| for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) |
| if (kvm_get_pcid(vcpu, vcpu->arch.mmu->prev_roots[i].cr3) |
| == operand.pcid) |
| roots_to_free |= KVM_MMU_ROOT_PREVIOUS(i); |
| |
| kvm_mmu_free_roots(vcpu, vcpu->arch.mmu, roots_to_free); |
| /* |
| * If neither the current cr3 nor any of the prev_roots use the |
| * given PCID, then nothing needs to be done here because a |
| * resync will happen anyway before switching to any other CR3. |
| */ |
| |
| return kvm_skip_emulated_instruction(vcpu); |
| |
| case INVPCID_TYPE_ALL_NON_GLOBAL: |
| /* |
| * Currently, KVM doesn't mark global entries in the shadow |
| * page tables, so a non-global flush just degenerates to a |
| * global flush. If needed, we could optimize this later by |
| * keeping track of global entries in shadow page tables. |
| */ |
| |
| /* fall-through */ |
| case INVPCID_TYPE_ALL_INCL_GLOBAL: |
| kvm_mmu_unload(vcpu); |
| return kvm_skip_emulated_instruction(vcpu); |
| |
| default: |
| BUG(); /* We have already checked above that type <= 3 */ |
| } |
| } |
| |
| static int handle_pml_full(struct kvm_vcpu *vcpu) |
| { |
| unsigned long exit_qualification; |
| |
| trace_kvm_pml_full(vcpu->vcpu_id); |
| |
| exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| |
| /* |
| * PML buffer FULL happened while executing iret from NMI, |
| * "blocked by NMI" bit has to be set before next VM entry. |
| */ |
| if (!(to_vmx(vcpu)->idt_vectoring_info & VECTORING_INFO_VALID_MASK) && |
| enable_vnmi && |
| (exit_qualification & INTR_INFO_UNBLOCK_NMI)) |
| vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, |
| GUEST_INTR_STATE_NMI); |
| |
| /* |
| * PML buffer already flushed at beginning of VMEXIT. Nothing to do |
| * here.., and there's no userspace involvement needed for PML. |
| */ |
| return 1; |
| } |
| |
| static int handle_preemption_timer(struct kvm_vcpu *vcpu) |
| { |
| if (!to_vmx(vcpu)->req_immediate_exit) |
| kvm_lapic_expired_hv_timer(vcpu); |
| return 1; |
| } |
| |
| static bool valid_ept_address(struct kvm_vcpu *vcpu, u64 address) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| int maxphyaddr = cpuid_maxphyaddr(vcpu); |
| |
| /* Check for memory type validity */ |
| switch (address & VMX_EPTP_MT_MASK) { |
| case VMX_EPTP_MT_UC: |
| if (!(vmx->nested.msrs.ept_caps & VMX_EPTP_UC_BIT)) |
| return false; |
| break; |
| case VMX_EPTP_MT_WB: |
| if (!(vmx->nested.msrs.ept_caps & VMX_EPTP_WB_BIT)) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| |
| /* only 4 levels page-walk length are valid */ |
| if ((address & VMX_EPTP_PWL_MASK) != VMX_EPTP_PWL_4) |
| return false; |
| |
| /* Reserved bits should not be set */ |
| if (address >> maxphyaddr || ((address >> 7) & 0x1f)) |
| return false; |
| |
| /* AD, if set, should be supported */ |
| if (address & VMX_EPTP_AD_ENABLE_BIT) { |
| if (!(vmx->nested.msrs.ept_caps & VMX_EPT_AD_BIT)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static int nested_vmx_eptp_switching(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| u32 index = vcpu->arch.regs[VCPU_REGS_RCX]; |
| u64 address; |
| bool accessed_dirty; |
| struct kvm_mmu *mmu = vcpu->arch.walk_mmu; |
| |
| if (!nested_cpu_has_eptp_switching(vmcs12) || |
| !nested_cpu_has_ept(vmcs12)) |
| return 1; |
| |
| if (index >= VMFUNC_EPTP_ENTRIES) |
| return 1; |
| |
| |
| if (kvm_vcpu_read_guest_page(vcpu, vmcs12->eptp_list_address >> PAGE_SHIFT, |
| &address, index * 8, 8)) |
| return 1; |
| |
| accessed_dirty = !!(address & VMX_EPTP_AD_ENABLE_BIT); |
| |
| /* |
| * If the (L2) guest does a vmfunc to the currently |
| * active ept pointer, we don't have to do anything else |
| */ |
| if (vmcs12->ept_pointer != address) { |
| if (!valid_ept_address(vcpu, address)) |
| return 1; |
| |
| kvm_mmu_unload(vcpu); |
| mmu->ept_ad = accessed_dirty; |
| mmu->base_role.ad_disabled = !accessed_dirty; |
| vmcs12->ept_pointer = address; |
| /* |
| * TODO: Check what's the correct approach in case |
| * mmu reload fails. Currently, we just let the next |
| * reload potentially fail |
| */ |
| kvm_mmu_reload(vcpu); |
| } |
| |
| return 0; |
| } |
| |
| static int handle_vmfunc(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct vmcs12 *vmcs12; |
| u32 function = vcpu->arch.regs[VCPU_REGS_RAX]; |
| |
| /* |
| * VMFUNC is only supported for nested guests, but we always enable the |
| * secondary control for simplicity; for non-nested mode, fake that we |
| * didn't by injecting #UD. |
| */ |
| if (!is_guest_mode(vcpu)) { |
| kvm_queue_exception(vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| vmcs12 = get_vmcs12(vcpu); |
| if ((vmcs12->vm_function_control & (1 << function)) == 0) |
| goto fail; |
| |
| switch (function) { |
| case 0: |
| if (nested_vmx_eptp_switching(vcpu, vmcs12)) |
| goto fail; |
| break; |
| default: |
| goto fail; |
| } |
| return kvm_skip_emulated_instruction(vcpu); |
| |
| fail: |
| nested_vmx_vmexit(vcpu, vmx->exit_reason, |
| vmcs_read32(VM_EXIT_INTR_INFO), |
| vmcs_readl(EXIT_QUALIFICATION)); |
| return 1; |
| } |
| |
| static int handle_encls(struct kvm_vcpu *vcpu) |
| { |
| /* |
| * SGX virtualization is not yet supported. There is no software |
| * enable bit for SGX, so we have to trap ENCLS and inject a #UD |
| * to prevent the guest from executing ENCLS. |
| */ |
| kvm_queue_exception(vcpu, UD_VECTOR); |
| return 1; |
| } |
| |
| /* |
| * The exit handlers return 1 if the exit was handled fully and guest execution |
| * may resume. Otherwise they set the kvm_run parameter to indicate what needs |
| * to be done to userspace and return 0. |
| */ |
| static int (*const kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = { |
| [EXIT_REASON_EXCEPTION_NMI] = handle_exception, |
| [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt, |
| [EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault, |
| [EXIT_REASON_NMI_WINDOW] = handle_nmi_window, |
| [EXIT_REASON_IO_INSTRUCTION] = handle_io, |
| [EXIT_REASON_CR_ACCESS] = handle_cr, |
| [EXIT_REASON_DR_ACCESS] = handle_dr, |
| [EXIT_REASON_CPUID] = handle_cpuid, |
| [EXIT_REASON_MSR_READ] = handle_rdmsr, |
| [EXIT_REASON_MSR_WRITE] = handle_wrmsr, |
| [EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window, |
| [EXIT_REASON_HLT] = handle_halt, |
| [EXIT_REASON_INVD] = handle_invd, |
| [EXIT_REASON_INVLPG] = handle_invlpg, |
| [EXIT_REASON_RDPMC] = handle_rdpmc, |
| [EXIT_REASON_VMCALL] = handle_vmcall, |
| [EXIT_REASON_VMCLEAR] = handle_vmclear, |
| [EXIT_REASON_VMLAUNCH] = handle_vmlaunch, |
| [EXIT_REASON_VMPTRLD] = handle_vmptrld, |
| [EXIT_REASON_VMPTRST] = handle_vmptrst, |
| [EXIT_REASON_VMREAD] = handle_vmread, |
| [EXIT_REASON_VMRESUME] = handle_vmresume, |
| [EXIT_REASON_VMWRITE] = handle_vmwrite, |
| [EXIT_REASON_VMOFF] = handle_vmoff, |
| [EXIT_REASON_VMON] = handle_vmon, |
| [EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold, |
| [EXIT_REASON_APIC_ACCESS] = handle_apic_access, |
| [EXIT_REASON_APIC_WRITE] = handle_apic_write, |
| [EXIT_REASON_EOI_INDUCED] = handle_apic_eoi_induced, |
| [EXIT_REASON_WBINVD] = handle_wbinvd, |
| [EXIT_REASON_XSETBV] = handle_xsetbv, |
| [EXIT_REASON_TASK_SWITCH] = handle_task_switch, |
| [EXIT_REASON_MCE_DURING_VMENTRY] = handle_machine_check, |
| [EXIT_REASON_GDTR_IDTR] = handle_desc, |
| [EXIT_REASON_LDTR_TR] = handle_desc, |
| [EXIT_REASON_EPT_VIOLATION] = handle_ept_violation, |
| [EXIT_REASON_EPT_MISCONFIG] = handle_ept_misconfig, |
| [EXIT_REASON_PAUSE_INSTRUCTION] = handle_pause, |
| [EXIT_REASON_MWAIT_INSTRUCTION] = handle_mwait, |
| [EXIT_REASON_MONITOR_TRAP_FLAG] = handle_monitor_trap, |
| [EXIT_REASON_MONITOR_INSTRUCTION] = handle_monitor, |
| [EXIT_REASON_INVEPT] = handle_invept, |
| [EXIT_REASON_INVVPID] = handle_invvpid, |
| [EXIT_REASON_RDRAND] = handle_invalid_op, |
| [EXIT_REASON_RDSEED] = handle_invalid_op, |
| [EXIT_REASON_XSAVES] = handle_xsaves, |
| [EXIT_REASON_XRSTORS] = handle_xrstors, |
| [EXIT_REASON_PML_FULL] = handle_pml_full, |
| [EXIT_REASON_INVPCID] = handle_invpcid, |
| [EXIT_REASON_VMFUNC] = handle_vmfunc, |
| [EXIT_REASON_PREEMPTION_TIMER] = handle_preemption_timer, |
| [EXIT_REASON_ENCLS] = handle_encls, |
| }; |
| |
| static const int kvm_vmx_max_exit_handlers = |
| ARRAY_SIZE(kvm_vmx_exit_handlers); |
| |
| static bool nested_vmx_exit_handled_io(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| unsigned long exit_qualification; |
| gpa_t bitmap, last_bitmap; |
| unsigned int port; |
| int size; |
| u8 b; |
| |
| if (!nested_cpu_has(vmcs12, CPU_BASED_USE_IO_BITMAPS)) |
| return nested_cpu_has(vmcs12, CPU_BASED_UNCOND_IO_EXITING); |
| |
| exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| |
| port = exit_qualification >> 16; |
| size = (exit_qualification & 7) + 1; |
| |
| last_bitmap = (gpa_t)-1; |
| b = -1; |
| |
| while (size > 0) { |
| if (port < 0x8000) |
| bitmap = vmcs12->io_bitmap_a; |
| else if (port < 0x10000) |
| bitmap = vmcs12->io_bitmap_b; |
| else |
| return true; |
| bitmap += (port & 0x7fff) / 8; |
| |
| if (last_bitmap != bitmap) |
| if (kvm_vcpu_read_guest(vcpu, bitmap, &b, 1)) |
| return true; |
| if (b & (1 << (port & 7))) |
| return true; |
| |
| port++; |
| size--; |
| last_bitmap = bitmap; |
| } |
| |
| return false; |
| } |
| |
| /* |
| * Return 1 if we should exit from L2 to L1 to handle an MSR access access, |
| * rather than handle it ourselves in L0. I.e., check whether L1 expressed |
| * disinterest in the current event (read or write a specific MSR) by using an |
| * MSR bitmap. This may be the case even when L0 doesn't use MSR bitmaps. |
| */ |
| static bool nested_vmx_exit_handled_msr(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12, u32 exit_reason) |
| { |
| u32 msr_index = vcpu->arch.regs[VCPU_REGS_RCX]; |
| gpa_t bitmap; |
| |
| if (!nested_cpu_has(vmcs12, CPU_BASED_USE_MSR_BITMAPS)) |
| return true; |
| |
| /* |
| * The MSR_BITMAP page is divided into four 1024-byte bitmaps, |
| * for the four combinations of read/write and low/high MSR numbers. |
| * First we need to figure out which of the four to use: |
| */ |
| bitmap = vmcs12->msr_bitmap; |
| if (exit_reason == EXIT_REASON_MSR_WRITE) |
| bitmap += 2048; |
| if (msr_index >= 0xc0000000) { |
| msr_index -= 0xc0000000; |
| bitmap += 1024; |
| } |
| |
| /* Then read the msr_index'th bit from this bitmap: */ |
| if (msr_index < 1024*8) { |
| unsigned char b; |
| if (kvm_vcpu_read_guest(vcpu, bitmap + msr_index/8, &b, 1)) |
| return true; |
| return 1 & (b >> (msr_index & 7)); |
| } else |
| return true; /* let L1 handle the wrong parameter */ |
| } |
| |
| /* |
| * Return 1 if we should exit from L2 to L1 to handle a CR access exit, |
| * rather than handle it ourselves in L0. I.e., check if L1 wanted to |
| * intercept (via guest_host_mask etc.) the current event. |
| */ |
| static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); |
| int cr = exit_qualification & 15; |
| int reg; |
| unsigned long val; |
| |
| switch ((exit_qualification >> 4) & 3) { |
| case 0: /* mov to cr */ |
| reg = (exit_qualification >> 8) & 15; |
| val = kvm_register_readl(vcpu, reg); |
| switch (cr) { |
| case 0: |
| if (vmcs12->cr0_guest_host_mask & |
| (val ^ vmcs12->cr0_read_shadow)) |
| return true; |
| break; |
| case 3: |
| if ((vmcs12->cr3_target_count >= 1 && |
| vmcs12->cr3_target_value0 == val) || |
| (vmcs12->cr3_target_count >= 2 && |
| vmcs12->cr3_target_value1 == val) || |
| (vmcs12->cr3_target_count >= 3 && |
| vmcs12->cr3_target_value2 == val) || |
| (vmcs12->cr3_target_count >= 4 && |
| vmcs12->cr3_target_value3 == val)) |
| return false; |
| if (nested_cpu_has(vmcs12, CPU_BASED_CR3_LOAD_EXITING)) |
| return true; |
| break; |
| case 4: |
| if (vmcs12->cr4_guest_host_mask & |
| (vmcs12->cr4_read_shadow ^ val)) |
| return true; |
| break; |
| case 8: |
| if (nested_cpu_has(vmcs12, CPU_BASED_CR8_LOAD_EXITING)) |
| return true; |
| break; |
| } |
| break; |
| case 2: /* clts */ |
| if ((vmcs12->cr0_guest_host_mask & X86_CR0_TS) && |
| (vmcs12->cr0_read_shadow & X86_CR0_TS)) |
| return true; |
| break; |
| case 1: /* mov from cr */ |
| switch (cr) { |
| case 3: |
| if (vmcs12->cpu_based_vm_exec_control & |
| CPU_BASED_CR3_STORE_EXITING) |
| return true; |
| break; |
| case 8: |
| if (vmcs12->cpu_based_vm_exec_control & |
| CPU_BASED_CR8_STORE_EXITING) |
| return true; |
| break; |
| } |
| break; |
| case 3: /* lmsw */ |
| /* |
| * lmsw can change bits 1..3 of cr0, and only set bit 0 of |
| * cr0. Other attempted changes are ignored, with no exit. |
| */ |
| val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f; |
| if (vmcs12->cr0_guest_host_mask & 0xe & |
| (val ^ vmcs12->cr0_read_shadow)) |
| return true; |
| if ((vmcs12->cr0_guest_host_mask & 0x1) && |
| !(vmcs12->cr0_read_shadow & 0x1) && |
| (val & 0x1)) |
| return true; |
| break; |
| } |
| return false; |
| } |
| |
| static bool nested_vmx_exit_handled_vmcs_access(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12, gpa_t bitmap) |
| { |
| u32 vmx_instruction_info; |
| unsigned long field; |
| u8 b; |
| |
| if (!nested_cpu_has_shadow_vmcs(vmcs12)) |
| return true; |
| |
| /* Decode instruction info and find the field to access */ |
| vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); |
| field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf)); |
| |
| /* Out-of-range fields always cause a VM exit from L2 to L1 */ |
| if (field >> 15) |
| return true; |
| |
| if (kvm_vcpu_read_guest(vcpu, bitmap + field/8, &b, 1)) |
| return true; |
| |
| return 1 & (b >> (field & 7)); |
| } |
| |
| /* |
| * Return 1 if we should exit from L2 to L1 to handle an exit, or 0 if we |
| * should handle it ourselves in L0 (and then continue L2). Only call this |
| * when in is_guest_mode (L2). |
| */ |
| static bool nested_vmx_exit_reflected(struct kvm_vcpu *vcpu, u32 exit_reason) |
| { |
| u32 intr_info = vmcs_read32(VM_EXIT_INTR_INFO); |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| |
| if (vmx->nested.nested_run_pending) |
| return false; |
| |
| if (unlikely(vmx->fail)) { |
| pr_info_ratelimited("%s failed vm entry %x\n", __func__, |
| vmcs_read32(VM_INSTRUCTION_ERROR)); |
| return true; |
| } |
| |
| /* |
| * The host physical addresses of some pages of guest memory |
| * are loaded into the vmcs02 (e.g. vmcs12's Virtual APIC |
| * Page). The CPU may write to these pages via their host |
| * physical address while L2 is running, bypassing any |
| * address-translation-based dirty tracking (e.g. EPT write |
| * protection). |
| * |
| * Mark them dirty on every exit from L2 to prevent them from |
| * getting out of sync with dirty tracking. |
| */ |
| nested_mark_vmcs12_pages_dirty(vcpu); |
| |
| trace_kvm_nested_vmexit(kvm_rip_read(vcpu), exit_reason, |
| vmcs_readl(EXIT_QUALIFICATION), |
| vmx->idt_vectoring_info, |
| intr_info, |
| vmcs_read32(VM_EXIT_INTR_ERROR_CODE), |
| KVM_ISA_VMX); |
| |
| switch (exit_reason) { |
| case EXIT_REASON_EXCEPTION_NMI: |
| if (is_nmi(intr_info)) |
| return false; |
| else if (is_page_fault(intr_info)) |
| return !vmx->vcpu.arch.apf.host_apf_reason && enable_ept; |
| else if (is_debug(intr_info) && |
| vcpu->guest_debug & |
| (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) |
| return false; |
| else if (is_breakpoint(intr_info) && |
| vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) |
| return false; |
| return vmcs12->exception_bitmap & |
| (1u << (intr_info & INTR_INFO_VECTOR_MASK)); |
| case EXIT_REASON_EXTERNAL_INTERRUPT: |
| return false; |
| case EXIT_REASON_TRIPLE_FAULT: |
| return true; |
| case EXIT_REASON_PENDING_INTERRUPT: |
| return nested_cpu_has(vmcs12, CPU_BASED_VIRTUAL_INTR_PENDING); |
| case EXIT_REASON_NMI_WINDOW: |
| return nested_cpu_has(vmcs12, CPU_BASED_VIRTUAL_NMI_PENDING); |
| case EXIT_REASON_TASK_SWITCH: |
| return true; |
| case EXIT_REASON_CPUID: |
| return true; |
| case EXIT_REASON_HLT: |
| return nested_cpu_has(vmcs12, CPU_BASED_HLT_EXITING); |
| case EXIT_REASON_INVD: |
| return true; |
| case EXIT_REASON_INVLPG: |
| return nested_cpu_has(vmcs12, CPU_BASED_INVLPG_EXITING); |
| case EXIT_REASON_RDPMC: |
| return nested_cpu_has(vmcs12, CPU_BASED_RDPMC_EXITING); |
| case EXIT_REASON_RDRAND: |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_RDRAND_EXITING); |
| case EXIT_REASON_RDSEED: |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_RDSEED_EXITING); |
| case EXIT_REASON_RDTSC: case EXIT_REASON_RDTSCP: |
| return nested_cpu_has(vmcs12, CPU_BASED_RDTSC_EXITING); |
| case EXIT_REASON_VMREAD: |
| return nested_vmx_exit_handled_vmcs_access(vcpu, vmcs12, |
| vmcs12->vmread_bitmap); |
| case EXIT_REASON_VMWRITE: |
| return nested_vmx_exit_handled_vmcs_access(vcpu, vmcs12, |
| vmcs12->vmwrite_bitmap); |
| case EXIT_REASON_VMCALL: case EXIT_REASON_VMCLEAR: |
| case EXIT_REASON_VMLAUNCH: case EXIT_REASON_VMPTRLD: |
| case EXIT_REASON_VMPTRST: case EXIT_REASON_VMRESUME: |
| case EXIT_REASON_VMOFF: case EXIT_REASON_VMON: |
| case EXIT_REASON_INVEPT: case EXIT_REASON_INVVPID: |
| /* |
| * VMX instructions trap unconditionally. This allows L1 to |
| * emulate them for its L2 guest, i.e., allows 3-level nesting! |
| */ |
| return true; |
| case EXIT_REASON_CR_ACCESS: |
| return nested_vmx_exit_handled_cr(vcpu, vmcs12); |
| case EXIT_REASON_DR_ACCESS: |
| return nested_cpu_has(vmcs12, CPU_BASED_MOV_DR_EXITING); |
| case EXIT_REASON_IO_INSTRUCTION: |
| return nested_vmx_exit_handled_io(vcpu, vmcs12); |
| case EXIT_REASON_GDTR_IDTR: case EXIT_REASON_LDTR_TR: |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_DESC); |
| case EXIT_REASON_MSR_READ: |
| case EXIT_REASON_MSR_WRITE: |
| return nested_vmx_exit_handled_msr(vcpu, vmcs12, exit_reason); |
| case EXIT_REASON_INVALID_STATE: |
| return true; |
| case EXIT_REASON_MWAIT_INSTRUCTION: |
| return nested_cpu_has(vmcs12, CPU_BASED_MWAIT_EXITING); |
| case EXIT_REASON_MONITOR_TRAP_FLAG: |
| return nested_cpu_has(vmcs12, CPU_BASED_MONITOR_TRAP_FLAG); |
| case EXIT_REASON_MONITOR_INSTRUCTION: |
| return nested_cpu_has(vmcs12, CPU_BASED_MONITOR_EXITING); |
| case EXIT_REASON_PAUSE_INSTRUCTION: |
| return nested_cpu_has(vmcs12, CPU_BASED_PAUSE_EXITING) || |
| nested_cpu_has2(vmcs12, |
| SECONDARY_EXEC_PAUSE_LOOP_EXITING); |
| case EXIT_REASON_MCE_DURING_VMENTRY: |
| return false; |
| case EXIT_REASON_TPR_BELOW_THRESHOLD: |
| return nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW); |
| case EXIT_REASON_APIC_ACCESS: |
| case EXIT_REASON_APIC_WRITE: |
| case EXIT_REASON_EOI_INDUCED: |
| /* |
| * The controls for "virtualize APIC accesses," "APIC- |
| * register virtualization," and "virtual-interrupt |
| * delivery" only come from vmcs12. |
| */ |
| return true; |
| case EXIT_REASON_EPT_VIOLATION: |
| /* |
| * L0 always deals with the EPT violation. If nested EPT is |
| * used, and the nested mmu code discovers that the address is |
| * missing in the guest EPT table (EPT12), the EPT violation |
| * will be injected with nested_ept_inject_page_fault() |
| */ |
| return false; |
| case EXIT_REASON_EPT_MISCONFIG: |
| /* |
| * L2 never uses directly L1's EPT, but rather L0's own EPT |
| * table (shadow on EPT) or a merged EPT table that L0 built |
| * (EPT on EPT). So any problems with the structure of the |
| * table is L0's fault. |
| */ |
| return false; |
| case EXIT_REASON_INVPCID: |
| return |
| nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_INVPCID) && |
| nested_cpu_has(vmcs12, CPU_BASED_INVLPG_EXITING); |
| case EXIT_REASON_WBINVD: |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_WBINVD_EXITING); |
| case EXIT_REASON_XSETBV: |
| return true; |
| case EXIT_REASON_XSAVES: case EXIT_REASON_XRSTORS: |
| /* |
| * This should never happen, since it is not possible to |
| * set XSS to a non-zero value---neither in L1 nor in L2. |
| * If if it were, XSS would have to be checked against |
| * the XSS exit bitmap in vmcs12. |
| */ |
| return nested_cpu_has2(vmcs12, SECONDARY_EXEC_XSAVES); |
| case EXIT_REASON_PREEMPTION_TIMER: |
| return false; |
| case EXIT_REASON_PML_FULL: |
| /* We emulate PML support to L1. */ |
| return false; |
| case EXIT_REASON_VMFUNC: |
| /* VM functions are emulated through L2->L0 vmexits. */ |
| return false; |
| case EXIT_REASON_ENCLS: |
| /* SGX is never exposed to L1 */ |
| return false; |
| default: |
| return true; |
| } |
| } |
| |
| static int nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason) |
| { |
| u32 exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); |
| |
| /* |
| * At this point, the exit interruption info in exit_intr_info |
| * is only valid for EXCEPTION_NMI exits. For EXTERNAL_INTERRUPT |
| * we need to query the in-kernel LAPIC. |
| */ |
| WARN_ON(exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT); |
| if ((exit_intr_info & |
| (INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK)) == |
| (INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK)) { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| vmcs12->vm_exit_intr_error_code = |
| vmcs_read32(VM_EXIT_INTR_ERROR_CODE); |
| } |
| |
| nested_vmx_vmexit(vcpu, exit_reason, exit_intr_info, |
| vmcs_readl(EXIT_QUALIFICATION)); |
| return 1; |
| } |
| |
| static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2) |
| { |
| *info1 = vmcs_readl(EXIT_QUALIFICATION); |
| *info2 = vmcs_read32(VM_EXIT_INTR_INFO); |
| } |
| |
| static void vmx_destroy_pml_buffer(struct vcpu_vmx *vmx) |
| { |
| if (vmx->pml_pg) { |
| __free_page(vmx->pml_pg); |
| vmx->pml_pg = NULL; |
| } |
| } |
| |
| static void vmx_flush_pml_buffer(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| u64 *pml_buf; |
| u16 pml_idx; |
| |
| pml_idx = vmcs_read16(GUEST_PML_INDEX); |
| |
| /* Do nothing if PML buffer is empty */ |
| if (pml_idx == (PML_ENTITY_NUM - 1)) |
| return; |
| |
| /* PML index always points to next available PML buffer entity */ |
| if (pml_idx >= PML_ENTITY_NUM) |
| pml_idx = 0; |
| else |
| pml_idx++; |
| |
| pml_buf = page_address(vmx->pml_pg); |
| for (; pml_idx < PML_ENTITY_NUM; pml_idx++) { |
| u64 gpa; |
| |
| gpa = pml_buf[pml_idx]; |
| WARN_ON(gpa & (PAGE_SIZE - 1)); |
| kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT); |
| } |
| |
| /* reset PML index */ |
| vmcs_write16(GUEST_PML_INDEX, PML_ENTITY_NUM - 1); |
| } |
| |
| /* |
| * Flush all vcpus' PML buffer and update logged GPAs to dirty_bitmap. |
| * Called before reporting dirty_bitmap to userspace. |
| */ |
| static void kvm_flush_pml_buffers(struct kvm *kvm) |
| { |
| int i; |
| struct kvm_vcpu *vcpu; |
| /* |
| * We only need to kick vcpu out of guest mode here, as PML buffer |
| * is flushed at beginning of all VMEXITs, and it's obvious that only |
| * vcpus running in guest are possible to have unflushed GPAs in PML |
| * buffer. |
| */ |
| kvm_for_each_vcpu(i, vcpu, kvm) |
| kvm_vcpu_kick(vcpu); |
| } |
| |
| static void vmx_dump_sel(char *name, uint32_t sel) |
| { |
| pr_err("%s sel=0x%04x, attr=0x%05x, limit=0x%08x, base=0x%016lx\n", |
| name, vmcs_read16(sel), |
| vmcs_read32(sel + GUEST_ES_AR_BYTES - GUEST_ES_SELECTOR), |
| vmcs_read32(sel + GUEST_ES_LIMIT - GUEST_ES_SELECTOR), |
| vmcs_readl(sel + GUEST_ES_BASE - GUEST_ES_SELECTOR)); |
| } |
| |
| static void vmx_dump_dtsel(char *name, uint32_t limit) |
| { |
| pr_err("%s limit=0x%08x, base=0x%016lx\n", |
| name, vmcs_read32(limit), |
| vmcs_readl(limit + GUEST_GDTR_BASE - GUEST_GDTR_LIMIT)); |
| } |
| |
| static void dump_vmcs(void) |
| { |
| u32 vmentry_ctl = vmcs_read32(VM_ENTRY_CONTROLS); |
| u32 vmexit_ctl = vmcs_read32(VM_EXIT_CONTROLS); |
| u32 cpu_based_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); |
| u32 pin_based_exec_ctrl = vmcs_read32(PIN_BASED_VM_EXEC_CONTROL); |
| u32 secondary_exec_control = 0; |
| unsigned long cr4 = vmcs_readl(GUEST_CR4); |
| u64 efer = vmcs_read64(GUEST_IA32_EFER); |
| int i, n; |
| |
| if (cpu_has_secondary_exec_ctrls()) |
| secondary_exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL); |
| |
| pr_err("*** Guest State ***\n"); |
| pr_err("CR0: actual=0x%016lx, shadow=0x%016lx, gh_mask=%016lx\n", |
| vmcs_readl(GUEST_CR0), vmcs_readl(CR0_READ_SHADOW), |
| vmcs_readl(CR0_GUEST_HOST_MASK)); |
| pr_err("CR4: actual=0x%016lx, shadow=0x%016lx, gh_mask=%016lx\n", |
| cr4, vmcs_readl(CR4_READ_SHADOW), vmcs_readl(CR4_GUEST_HOST_MASK)); |
| pr_err("CR3 = 0x%016lx\n", vmcs_readl(GUEST_CR3)); |
| if ((secondary_exec_control & SECONDARY_EXEC_ENABLE_EPT) && |
| (cr4 & X86_CR4_PAE) && !(efer & EFER_LMA)) |
| { |
| pr_err("PDPTR0 = 0x%016llx PDPTR1 = 0x%016llx\n", |
| vmcs_read64(GUEST_PDPTR0), vmcs_read64(GUEST_PDPTR1)); |
| pr_err("PDPTR2 = 0x%016llx PDPTR3 = 0x%016llx\n", |
| vmcs_read64(GUEST_PDPTR2), vmcs_read64(GUEST_PDPTR3)); |
| } |
| pr_err("RSP = 0x%016lx RIP = 0x%016lx\n", |
| vmcs_readl(GUEST_RSP), vmcs_readl(GUEST_RIP)); |
| pr_err("RFLAGS=0x%08lx DR7 = 0x%016lx\n", |
| vmcs_readl(GUEST_RFLAGS), vmcs_readl(GUEST_DR7)); |
| pr_err("Sysenter RSP=%016lx CS:RIP=%04x:%016lx\n", |
| vmcs_readl(GUEST_SYSENTER_ESP), |
| vmcs_read32(GUEST_SYSENTER_CS), vmcs_readl(GUEST_SYSENTER_EIP)); |
| vmx_dump_sel("CS: ", GUEST_CS_SELECTOR); |
| vmx_dump_sel("DS: ", GUEST_DS_SELECTOR); |
| vmx_dump_sel("SS: ", GUEST_SS_SELECTOR); |
| vmx_dump_sel("ES: ", GUEST_ES_SELECTOR); |
| vmx_dump_sel("FS: ", GUEST_FS_SELECTOR); |
| vmx_dump_sel("GS: ", GUEST_GS_SELECTOR); |
| vmx_dump_dtsel("GDTR:", GUEST_GDTR_LIMIT); |
| vmx_dump_sel("LDTR:", GUEST_LDTR_SELECTOR); |
| vmx_dump_dtsel("IDTR:", GUEST_IDTR_LIMIT); |
| vmx_dump_sel("TR: ", GUEST_TR_SELECTOR); |
| if ((vmexit_ctl & (VM_EXIT_SAVE_IA32_PAT | VM_EXIT_SAVE_IA32_EFER)) || |
| (vmentry_ctl & (VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_LOAD_IA32_EFER))) |
| pr_err("EFER = 0x%016llx PAT = 0x%016llx\n", |
| efer, vmcs_read64(GUEST_IA32_PAT)); |
| pr_err("DebugCtl = 0x%016llx DebugExceptions = 0x%016lx\n", |
| vmcs_read64(GUEST_IA32_DEBUGCTL), |
| vmcs_readl(GUEST_PENDING_DBG_EXCEPTIONS)); |
| if (cpu_has_load_perf_global_ctrl && |
| vmentry_ctl & VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL) |
| pr_err("PerfGlobCtl = 0x%016llx\n", |
| vmcs_read64(GUEST_IA32_PERF_GLOBAL_CTRL)); |
| if (vmentry_ctl & VM_ENTRY_LOAD_BNDCFGS) |
| pr_err("BndCfgS = 0x%016llx\n", vmcs_read64(GUEST_BNDCFGS)); |
| pr_err("Interruptibility = %08x ActivityState = %08x\n", |
| vmcs_read32(GUEST_INTERRUPTIBILITY_INFO), |
| vmcs_read32(GUEST_ACTIVITY_STATE)); |
| if (secondary_exec_control & SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY) |
| pr_err("InterruptStatus = %04x\n", |
| vmcs_read16(GUEST_INTR_STATUS)); |
| |
| pr_err("*** Host State ***\n"); |
| pr_err("RIP = 0x%016lx RSP = 0x%016lx\n", |
| vmcs_readl(HOST_RIP), vmcs_readl(HOST_RSP)); |
| pr_err("CS=%04x SS=%04x DS=%04x ES=%04x FS=%04x GS=%04x TR=%04x\n", |
| vmcs_read16(HOST_CS_SELECTOR), vmcs_read16(HOST_SS_SELECTOR), |
| vmcs_read16(HOST_DS_SELECTOR), vmcs_read16(HOST_ES_SELECTOR), |
| vmcs_read16(HOST_FS_SELECTOR), vmcs_read16(HOST_GS_SELECTOR), |
| vmcs_read16(HOST_TR_SELECTOR)); |
| pr_err("FSBase=%016lx GSBase=%016lx TRBase=%016lx\n", |
| vmcs_readl(HOST_FS_BASE), vmcs_readl(HOST_GS_BASE), |
| vmcs_readl(HOST_TR_BASE)); |
| pr_err("GDTBase=%016lx IDTBase=%016lx\n", |
| vmcs_readl(HOST_GDTR_BASE), vmcs_readl(HOST_IDTR_BASE)); |
| pr_err("CR0=%016lx CR3=%016lx CR4=%016lx\n", |
| vmcs_readl(HOST_CR0), vmcs_readl(HOST_CR3), |
| vmcs_readl(HOST_CR4)); |
| pr_err("Sysenter RSP=%016lx CS:RIP=%04x:%016lx\n", |
| vmcs_readl(HOST_IA32_SYSENTER_ESP), |
| vmcs_read32(HOST_IA32_SYSENTER_CS), |
| vmcs_readl(HOST_IA32_SYSENTER_EIP)); |
| if (vmexit_ctl & (VM_EXIT_LOAD_IA32_PAT | VM_EXIT_LOAD_IA32_EFER)) |
| pr_err("EFER = 0x%016llx PAT = 0x%016llx\n", |
| vmcs_read64(HOST_IA32_EFER), |
| vmcs_read64(HOST_IA32_PAT)); |
| if (cpu_has_load_perf_global_ctrl && |
| vmexit_ctl & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL) |
| pr_err("PerfGlobCtl = 0x%016llx\n", |
| vmcs_read64(HOST_IA32_PERF_GLOBAL_CTRL)); |
| |
| pr_err("*** Control State ***\n"); |
| pr_err("PinBased=%08x CPUBased=%08x SecondaryExec=%08x\n", |
| pin_based_exec_ctrl, cpu_based_exec_ctrl, secondary_exec_control); |
| pr_err("EntryControls=%08x ExitControls=%08x\n", vmentry_ctl, vmexit_ctl); |
| pr_err("ExceptionBitmap=%08x PFECmask=%08x PFECmatch=%08x\n", |
| vmcs_read32(EXCEPTION_BITMAP), |
| vmcs_read32(PAGE_FAULT_ERROR_CODE_MASK), |
| vmcs_read32(PAGE_FAULT_ERROR_CODE_MATCH)); |
| pr_err("VMEntry: intr_info=%08x errcode=%08x ilen=%08x\n", |
| vmcs_read32(VM_ENTRY_INTR_INFO_FIELD), |
| vmcs_read32(VM_ENTRY_EXCEPTION_ERROR_CODE), |
| vmcs_read32(VM_ENTRY_INSTRUCTION_LEN)); |
| pr_err("VMExit: intr_info=%08x errcode=%08x ilen=%08x\n", |
| vmcs_read32(VM_EXIT_INTR_INFO), |
| vmcs_read32(VM_EXIT_INTR_ERROR_CODE), |
| vmcs_read32(VM_EXIT_INSTRUCTION_LEN)); |
| pr_err(" reason=%08x qualification=%016lx\n", |
| vmcs_read32(VM_EXIT_REASON), vmcs_readl(EXIT_QUALIFICATION)); |
| pr_err("IDTVectoring: info=%08x errcode=%08x\n", |
| vmcs_read32(IDT_VECTORING_INFO_FIELD), |
| vmcs_read32(IDT_VECTORING_ERROR_CODE)); |
| pr_err("TSC Offset = 0x%016llx\n", vmcs_read64(TSC_OFFSET)); |
| if (secondary_exec_control & SECONDARY_EXEC_TSC_SCALING) |
| pr_err("TSC Multiplier = 0x%016llx\n", |
| vmcs_read64(TSC_MULTIPLIER)); |
| if (cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW) |
| pr_err("TPR Threshold = 0x%02x\n", vmcs_read32(TPR_THRESHOLD)); |
| if (pin_based_exec_ctrl & PIN_BASED_POSTED_INTR) |
| pr_err("PostedIntrVec = 0x%02x\n", vmcs_read16(POSTED_INTR_NV)); |
| if ((secondary_exec_control & SECONDARY_EXEC_ENABLE_EPT)) |
| pr_err("EPT pointer = 0x%016llx\n", vmcs_read64(EPT_POINTER)); |
| n = vmcs_read32(CR3_TARGET_COUNT); |
| for (i = 0; i + 1 < n; i += 4) |
| pr_err("CR3 target%u=%016lx target%u=%016lx\n", |
| i, vmcs_readl(CR3_TARGET_VALUE0 + i * 2), |
| i + 1, vmcs_readl(CR3_TARGET_VALUE0 + i * 2 + 2)); |
| if (i < n) |
| pr_err("CR3 target%u=%016lx\n", |
| i, vmcs_readl(CR3_TARGET_VALUE0 + i * 2)); |
| if (secondary_exec_control & SECONDARY_EXEC_PAUSE_LOOP_EXITING) |
| pr_err("PLE Gap=%08x Window=%08x\n", |
| vmcs_read32(PLE_GAP), vmcs_read32(PLE_WINDOW)); |
| if (secondary_exec_control & SECONDARY_EXEC_ENABLE_VPID) |
| pr_err("Virtual processor ID = 0x%04x\n", |
| vmcs_read16(VIRTUAL_PROCESSOR_ID)); |
| } |
| |
| /* |
| * The guest has exited. See if we can fix it or if we need userspace |
| * assistance. |
| */ |
| static int vmx_handle_exit(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| u32 exit_reason = vmx->exit_reason; |
| u32 vectoring_info = vmx->idt_vectoring_info; |
| |
| trace_kvm_exit(exit_reason, vcpu, KVM_ISA_VMX); |
| |
| /* |
| * Flush logged GPAs PML buffer, this will make dirty_bitmap more |
| * updated. Another good is, in kvm_vm_ioctl_get_dirty_log, before |
| * querying dirty_bitmap, we only need to kick all vcpus out of guest |
| * mode as if vcpus is in root mode, the PML buffer must has been |
| * flushed already. |
| */ |
| if (enable_pml) |
| vmx_flush_pml_buffer(vcpu); |
| |
| /* If guest state is invalid, start emulating */ |
| if (vmx->emulation_required) |
| return handle_invalid_guest_state(vcpu); |
| |
| if (is_guest_mode(vcpu) && nested_vmx_exit_reflected(vcpu, exit_reason)) |
| return nested_vmx_reflect_vmexit(vcpu, exit_reason); |
| |
| if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) { |
| dump_vmcs(); |
| vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; |
| vcpu->run->fail_entry.hardware_entry_failure_reason |
| = exit_reason; |
| return 0; |
| } |
| |
| if (unlikely(vmx->fail)) { |
| vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; |
| vcpu->run->fail_entry.hardware_entry_failure_reason |
| = vmcs_read32(VM_INSTRUCTION_ERROR); |
| return 0; |
| } |
| |
| /* |
| * Note: |
| * Do not try to fix EXIT_REASON_EPT_MISCONFIG if it caused by |
| * delivery event since it indicates guest is accessing MMIO. |
| * The vm-exit can be triggered again after return to guest that |
| * will cause infinite loop. |
| */ |
| if ((vectoring_info & VECTORING_INFO_VALID_MASK) && |
| (exit_reason != EXIT_REASON_EXCEPTION_NMI && |
| exit_reason != EXIT_REASON_EPT_VIOLATION && |
| exit_reason != EXIT_REASON_PML_FULL && |
| exit_reason != EXIT_REASON_TASK_SWITCH)) { |
| vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; |
| vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_DELIVERY_EV; |
| vcpu->run->internal.ndata = 3; |
| vcpu->run->internal.data[0] = vectoring_info; |
| vcpu->run->internal.data[1] = exit_reason; |
| vcpu->run->internal.data[2] = vcpu->arch.exit_qualification; |
| if (exit_reason == EXIT_REASON_EPT_MISCONFIG) { |
| vcpu->run->internal.ndata++; |
| vcpu->run->internal.data[3] = |
| vmcs_read64(GUEST_PHYSICAL_ADDRESS); |
| } |
| return 0; |
| } |
| |
| if (unlikely(!enable_vnmi && |
| vmx->loaded_vmcs->soft_vnmi_blocked)) { |
| if (vmx_interrupt_allowed(vcpu)) { |
| vmx->loaded_vmcs->soft_vnmi_blocked = 0; |
| } else if (vmx->loaded_vmcs->vnmi_blocked_time > 1000000000LL && |
| vcpu->arch.nmi_pending) { |
| /* |
| * This CPU don't support us in finding the end of an |
| * NMI-blocked window if the guest runs with IRQs |
| * disabled. So we pull the trigger after 1 s of |
| * futile waiting, but inform the user about this. |
| */ |
| printk(KERN_WARNING "%s: Breaking out of NMI-blocked " |
| "state on VCPU %d after 1 s timeout\n", |
| __func__, vcpu->vcpu_id); |
| vmx->loaded_vmcs->soft_vnmi_blocked = 0; |
| } |
| } |
| |
| if (exit_reason < kvm_vmx_max_exit_handlers |
| && kvm_vmx_exit_handlers[exit_reason]) |
| return kvm_vmx_exit_handlers[exit_reason](vcpu); |
| else { |
| vcpu_unimpl(vcpu, "vmx: unexpected exit reason 0x%x\n", |
| exit_reason); |
| kvm_queue_exception(vcpu, UD_VECTOR); |
| return 1; |
| } |
| } |
| |
| /* |
| * Software based L1D cache flush which is used when microcode providing |
| * the cache control MSR is not loaded. |
| * |
| * The L1D cache is 32 KiB on Nehalem and later microarchitectures, but to |
| * flush it is required to read in 64 KiB because the replacement algorithm |
| * is not exactly LRU. This could be sized at runtime via topology |
| * information but as all relevant affected CPUs have 32KiB L1D cache size |
| * there is no point in doing so. |
| */ |
| static void vmx_l1d_flush(struct kvm_vcpu *vcpu) |
| { |
| int size = PAGE_SIZE << L1D_CACHE_ORDER; |
| |
| /* |
| * This code is only executed when the the flush mode is 'cond' or |
| * 'always' |
| */ |
| if (static_branch_likely(&vmx_l1d_flush_cond)) { |
| bool flush_l1d; |
| |
| /* |
| * Clear the per-vcpu flush bit, it gets set again |
| * either from vcpu_run() or from one of the unsafe |
| * VMEXIT handlers. |
| */ |
| flush_l1d = vcpu->arch.l1tf_flush_l1d; |
| vcpu->arch.l1tf_flush_l1d = false; |
| |
| /* |
| * Clear the per-cpu flush bit, it gets set again from |
| * the interrupt handlers. |
| */ |
| flush_l1d |= kvm_get_cpu_l1tf_flush_l1d(); |
| kvm_clear_cpu_l1tf_flush_l1d(); |
| |
| if (!flush_l1d) |
| return; |
| } |
| |
| vcpu->stat.l1d_flush++; |
| |
| if (static_cpu_has(X86_FEATURE_FLUSH_L1D)) { |
| wrmsrl(MSR_IA32_FLUSH_CMD, L1D_FLUSH); |
| return; |
| } |
| |
| asm volatile( |
| /* First ensure the pages are in the TLB */ |
| "xorl %%eax, %%eax\n" |
| ".Lpopulate_tlb:\n\t" |
| "movzbl (%[flush_pages], %%" _ASM_AX "), %%ecx\n\t" |
| "addl $4096, %%eax\n\t" |
| "cmpl %%eax, %[size]\n\t" |
| "jne .Lpopulate_tlb\n\t" |
| "xorl %%eax, %%eax\n\t" |
| "cpuid\n\t" |
| /* Now fill the cache */ |
| "xorl %%eax, %%eax\n" |
| ".Lfill_cache:\n" |
| "movzbl (%[flush_pages], %%" _ASM_AX "), %%ecx\n\t" |
| "addl $64, %%eax\n\t" |
| "cmpl %%eax, %[size]\n\t" |
| "jne .Lfill_cache\n\t" |
| "lfence\n" |
| :: [flush_pages] "r" (vmx_l1d_flush_pages), |
| [size] "r" (size) |
| : "eax", "ebx", "ecx", "edx"); |
| } |
| |
| static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr) |
| { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| |
| if (is_guest_mode(vcpu) && |
| nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) |
| return; |
| |
| if (irr == -1 || tpr < irr) { |
| vmcs_write32(TPR_THRESHOLD, 0); |
| return; |
| } |
| |
| vmcs_write32(TPR_THRESHOLD, irr); |
| } |
| |
| static void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu) |
| { |
| u32 sec_exec_control; |
| |
| if (!lapic_in_kernel(vcpu)) |
| return; |
| |
| if (!flexpriority_enabled && |
| !cpu_has_vmx_virtualize_x2apic_mode()) |
| return; |
| |
| /* Postpone execution until vmcs01 is the current VMCS. */ |
| if (is_guest_mode(vcpu)) { |
| to_vmx(vcpu)->nested.change_vmcs01_virtual_apic_mode = true; |
| return; |
| } |
| |
| sec_exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL); |
| sec_exec_control &= ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | |
| SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE); |
| |
| switch (kvm_get_apic_mode(vcpu)) { |
| case LAPIC_MODE_INVALID: |
| WARN_ONCE(true, "Invalid local APIC state"); |
| case LAPIC_MODE_DISABLED: |
| break; |
| case LAPIC_MODE_XAPIC: |
| if (flexpriority_enabled) { |
| sec_exec_control |= |
| SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; |
| vmx_flush_tlb(vcpu, true); |
| } |
| break; |
| case LAPIC_MODE_X2APIC: |
| if (cpu_has_vmx_virtualize_x2apic_mode()) |
| sec_exec_control |= |
| SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE; |
| break; |
| } |
| vmcs_write32(SECONDARY_VM_EXEC_CONTROL, sec_exec_control); |
| |
| vmx_update_msr_bitmap(vcpu); |
| } |
| |
| static void vmx_set_apic_access_page_addr(struct kvm_vcpu *vcpu, hpa_t hpa) |
| { |
| if (!is_guest_mode(vcpu)) { |
| vmcs_write64(APIC_ACCESS_ADDR, hpa); |
| vmx_flush_tlb(vcpu, true); |
| } |
| } |
| |
| static void vmx_hwapic_isr_update(struct kvm_vcpu *vcpu, int max_isr) |
| { |
| u16 status; |
| u8 old; |
| |
| if (max_isr == -1) |
| max_isr = 0; |
| |
| status = vmcs_read16(GUEST_INTR_STATUS); |
| old = status >> 8; |
| if (max_isr != old) { |
| status &= 0xff; |
| status |= max_isr << 8; |
| vmcs_write16(GUEST_INTR_STATUS, status); |
| } |
| } |
| |
| static void vmx_set_rvi(int vector) |
| { |
| u16 status; |
| u8 old; |
| |
| if (vector == -1) |
| vector = 0; |
| |
| status = vmcs_read16(GUEST_INTR_STATUS); |
| old = (u8)status & 0xff; |
| if ((u8)vector != old) { |
| status &= ~0xff; |
| status |= (u8)vector; |
| vmcs_write16(GUEST_INTR_STATUS, status); |
| } |
| } |
| |
| static void vmx_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr) |
| { |
| /* |
| * When running L2, updating RVI is only relevant when |
| * vmcs12 virtual-interrupt-delivery enabled. |
| * However, it can be enabled only when L1 also |
| * intercepts external-interrupts and in that case |
| * we should not update vmcs02 RVI but instead intercept |
| * interrupt. Therefore, do nothing when running L2. |
| */ |
| if (!is_guest_mode(vcpu)) |
| vmx_set_rvi(max_irr); |
| } |
| |
| static int vmx_sync_pir_to_irr(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| int max_irr; |
| bool max_irr_updated; |
| |
| WARN_ON(!vcpu->arch.apicv_active); |
| if (pi_test_on(&vmx->pi_desc)) { |
| pi_clear_on(&vmx->pi_desc); |
| /* |
| * IOMMU can write to PIR.ON, so the barrier matters even on UP. |
| * But on x86 this is just a compiler barrier anyway. |
| */ |
| smp_mb__after_atomic(); |
| max_irr_updated = |
| kvm_apic_update_irr(vcpu, vmx->pi_desc.pir, &max_irr); |
| |
| /* |
| * If we are running L2 and L1 has a new pending interrupt |
| * which can be injected, we should re-evaluate |
| * what should be done with this new L1 interrupt. |
| * If L1 intercepts external-interrupts, we should |
| * exit from L2 to L1. Otherwise, interrupt should be |
| * delivered directly to L2. |
| */ |
| if (is_guest_mode(vcpu) && max_irr_updated) { |
| if (nested_exit_on_intr(vcpu)) |
| kvm_vcpu_exiting_guest_mode(vcpu); |
| else |
| kvm_make_request(KVM_REQ_EVENT, vcpu); |
| } |
| } else { |
| max_irr = kvm_lapic_find_highest_irr(vcpu); |
| } |
| vmx_hwapic_irr_update(vcpu, max_irr); |
| return max_irr; |
| } |
| |
| static u8 vmx_has_apicv_interrupt(struct kvm_vcpu *vcpu) |
| { |
| u8 rvi = vmx_get_rvi(); |
| u8 vppr = kvm_lapic_get_reg(vcpu->arch.apic, APIC_PROCPRI); |
| |
| return ((rvi & 0xf0) > (vppr & 0xf0)); |
| } |
| |
| static void vmx_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap) |
| { |
| if (!kvm_vcpu_apicv_active(vcpu)) |
| return; |
| |
| vmcs_write64(EOI_EXIT_BITMAP0, eoi_exit_bitmap[0]); |
| vmcs_write64(EOI_EXIT_BITMAP1, eoi_exit_bitmap[1]); |
| vmcs_write64(EOI_EXIT_BITMAP2, eoi_exit_bitmap[2]); |
| vmcs_write64(EOI_EXIT_BITMAP3, eoi_exit_bitmap[3]); |
| } |
| |
| static void vmx_apicv_post_state_restore(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| pi_clear_on(&vmx->pi_desc); |
| memset(vmx->pi_desc.pir, 0, sizeof(vmx->pi_desc.pir)); |
| } |
| |
| static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx) |
| { |
| u32 exit_intr_info = 0; |
| u16 basic_exit_reason = (u16)vmx->exit_reason; |
| |
| if (!(basic_exit_reason == EXIT_REASON_MCE_DURING_VMENTRY |
| || basic_exit_reason == EXIT_REASON_EXCEPTION_NMI)) |
| return; |
| |
| if (!(vmx->exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) |
| exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); |
| vmx->exit_intr_info = exit_intr_info; |
| |
| /* if exit due to PF check for async PF */ |
| if (is_page_fault(exit_intr_info)) |
| vmx->vcpu.arch.apf.host_apf_reason = kvm_read_and_reset_pf_reason(); |
| |
| /* Handle machine checks before interrupts are enabled */ |
| if (basic_exit_reason == EXIT_REASON_MCE_DURING_VMENTRY || |
| is_machine_check(exit_intr_info)) |
| kvm_machine_check(); |
| |
| /* We need to handle NMIs before interrupts are enabled */ |
| if (is_nmi(exit_intr_info)) { |
| kvm_before_interrupt(&vmx->vcpu); |
| asm("int $2"); |
| kvm_after_interrupt(&vmx->vcpu); |
| } |
| } |
| |
| static void vmx_handle_external_intr(struct kvm_vcpu *vcpu) |
| { |
| u32 exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); |
| |
| if ((exit_intr_info & (INTR_INFO_VALID_MASK | INTR_INFO_INTR_TYPE_MASK)) |
| == (INTR_INFO_VALID_MASK | INTR_TYPE_EXT_INTR)) { |
| unsigned int vector; |
| unsigned long entry; |
| gate_desc *desc; |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| #ifdef CONFIG_X86_64 |
| unsigned long tmp; |
| #endif |
| |
| vector = exit_intr_info & INTR_INFO_VECTOR_MASK; |
| desc = (gate_desc *)vmx->host_idt_base + vector; |
| entry = gate_offset(desc); |
| asm volatile( |
| #ifdef CONFIG_X86_64 |
| "mov %%" _ASM_SP ", %[sp]\n\t" |
| "and $0xfffffffffffffff0, %%" _ASM_SP "\n\t" |
| "push $%c[ss]\n\t" |
| "push %[sp]\n\t" |
| #endif |
| "pushf\n\t" |
| __ASM_SIZE(push) " $%c[cs]\n\t" |
| CALL_NOSPEC |
| : |
| #ifdef CONFIG_X86_64 |
| [sp]"=&r"(tmp), |
| #endif |
| ASM_CALL_CONSTRAINT |
| : |
| THUNK_TARGET(entry), |
| [ss]"i"(__KERNEL_DS), |
| [cs]"i"(__KERNEL_CS) |
| ); |
| } |
| } |
| STACK_FRAME_NON_STANDARD(vmx_handle_external_intr); |
| |
| static bool vmx_has_emulated_msr(int index) |
| { |
| switch (index) { |
| case MSR_IA32_SMBASE: |
| /* |
| * We cannot do SMM unless we can run the guest in big |
| * real mode. |
| */ |
| return enable_unrestricted_guest || emulate_invalid_guest_state; |
| case MSR_AMD64_VIRT_SPEC_CTRL: |
| /* This is AMD only. */ |
| return false; |
| default: |
| return true; |
| } |
| } |
| |
| static bool vmx_mpx_supported(void) |
| { |
| return (vmcs_config.vmexit_ctrl & VM_EXIT_CLEAR_BNDCFGS) && |
| (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_BNDCFGS); |
| } |
| |
| static bool vmx_xsaves_supported(void) |
| { |
| return vmcs_config.cpu_based_2nd_exec_ctrl & |
| SECONDARY_EXEC_XSAVES; |
| } |
| |
| static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx) |
| { |
| u32 exit_intr_info; |
| bool unblock_nmi; |
| u8 vector; |
| bool idtv_info_valid; |
| |
| idtv_info_valid = vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK; |
| |
| if (enable_vnmi) { |
| if (vmx->loaded_vmcs->nmi_known_unmasked) |
| return; |
| /* |
| * Can't use vmx->exit_intr_info since we're not sure what |
| * the exit reason is. |
| */ |
| exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); |
| unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0; |
| vector = exit_intr_info & INTR_INFO_VECTOR_MASK; |
| /* |
| * SDM 3: 27.7.1.2 (September 2008) |
| * Re-set bit "block by NMI" before VM entry if vmexit caused by |
| * a guest IRET fault. |
| * SDM 3: 23.2.2 (September 2008) |
| * Bit 12 is undefined in any of the following cases: |
| * If the VM exit sets the valid bit in the IDT-vectoring |
| * information field. |
| * If the VM exit is due to a double fault. |
| */ |
| if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi && |
| vector != DF_VECTOR && !idtv_info_valid) |
| vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, |
| GUEST_INTR_STATE_NMI); |
| else |
| vmx->loaded_vmcs->nmi_known_unmasked = |
| !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) |
| & GUEST_INTR_STATE_NMI); |
| } else if (unlikely(vmx->loaded_vmcs->soft_vnmi_blocked)) |
| vmx->loaded_vmcs->vnmi_blocked_time += |
| ktime_to_ns(ktime_sub(ktime_get(), |
| vmx->loaded_vmcs->entry_time)); |
| } |
| |
| static void __vmx_complete_interrupts(struct kvm_vcpu *vcpu, |
| u32 idt_vectoring_info, |
| int instr_len_field, |
| int error_code_field) |
| { |
| u8 vector; |
| int type; |
| bool idtv_info_valid; |
| |
| idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK; |
| |
| vcpu->arch.nmi_injected = false; |
| kvm_clear_exception_queue(vcpu); |
| kvm_clear_interrupt_queue(vcpu); |
| |
| if (!idtv_info_valid) |
| return; |
| |
| kvm_make_request(KVM_REQ_EVENT, vcpu); |
| |
| vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK; |
| type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK; |
| |
| switch (type) { |
| case INTR_TYPE_NMI_INTR: |
| vcpu->arch.nmi_injected = true; |
| /* |
| * SDM 3: 27.7.1.2 (September 2008) |
| * Clear bit "block by NMI" before VM entry if a NMI |
| * delivery faulted. |
| */ |
| vmx_set_nmi_mask(vcpu, false); |
| break; |
| case INTR_TYPE_SOFT_EXCEPTION: |
| vcpu->arch.event_exit_inst_len = vmcs_read32(instr_len_field); |
| /* fall through */ |
| case INTR_TYPE_HARD_EXCEPTION: |
| if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) { |
| u32 err = vmcs_read32(error_code_field); |
| kvm_requeue_exception_e(vcpu, vector, err); |
| } else |
| kvm_requeue_exception(vcpu, vector); |
| break; |
| case INTR_TYPE_SOFT_INTR: |
| vcpu->arch.event_exit_inst_len = vmcs_read32(instr_len_field); |
| /* fall through */ |
| case INTR_TYPE_EXT_INTR: |
| kvm_queue_interrupt(vcpu, vector, type == INTR_TYPE_SOFT_INTR); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static void vmx_complete_interrupts(struct vcpu_vmx *vmx) |
| { |
| __vmx_complete_interrupts(&vmx->vcpu, vmx->idt_vectoring_info, |
| VM_EXIT_INSTRUCTION_LEN, |
| IDT_VECTORING_ERROR_CODE); |
| } |
| |
| static void vmx_cancel_injection(struct kvm_vcpu *vcpu) |
| { |
| __vmx_complete_interrupts(vcpu, |
| vmcs_read32(VM_ENTRY_INTR_INFO_FIELD), |
| VM_ENTRY_INSTRUCTION_LEN, |
| VM_ENTRY_EXCEPTION_ERROR_CODE); |
| |
| vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); |
| } |
| |
| static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx) |
| { |
| int i, nr_msrs; |
| struct perf_guest_switch_msr *msrs; |
| |
| msrs = perf_guest_get_msrs(&nr_msrs); |
| |
| if (!msrs) |
| return; |
| |
| for (i = 0; i < nr_msrs; i++) |
| if (msrs[i].host == msrs[i].guest) |
| clear_atomic_switch_msr(vmx, msrs[i].msr); |
| else |
| add_atomic_switch_msr(vmx, msrs[i].msr, msrs[i].guest, |
| msrs[i].host, false); |
| } |
| |
| static void vmx_arm_hv_timer(struct vcpu_vmx *vmx, u32 val) |
| { |
| vmcs_write32(VMX_PREEMPTION_TIMER_VALUE, val); |
| if (!vmx->loaded_vmcs->hv_timer_armed) |
| vmcs_set_bits(PIN_BASED_VM_EXEC_CONTROL, |
| PIN_BASED_VMX_PREEMPTION_TIMER); |
| vmx->loaded_vmcs->hv_timer_armed = true; |
| } |
| |
| static void vmx_update_hv_timer(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| u64 tscl; |
| u32 delta_tsc; |
| |
| if (vmx->req_immediate_exit) { |
| vmx_arm_hv_timer(vmx, 0); |
| return; |
| } |
| |
| if (vmx->hv_deadline_tsc != -1) { |
| tscl = rdtsc(); |
| if (vmx->hv_deadline_tsc > tscl) |
| /* set_hv_timer ensures the delta fits in 32-bits */ |
| delta_tsc = (u32)((vmx->hv_deadline_tsc - tscl) >> |
| cpu_preemption_timer_multi); |
| else |
| delta_tsc = 0; |
| |
| vmx_arm_hv_timer(vmx, delta_tsc); |
| return; |
| } |
| |
| if (vmx->loaded_vmcs->hv_timer_armed) |
| vmcs_clear_bits(PIN_BASED_VM_EXEC_CONTROL, |
| PIN_BASED_VMX_PREEMPTION_TIMER); |
| vmx->loaded_vmcs->hv_timer_armed = false; |
| } |
| |
| static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| unsigned long cr3, cr4, evmcs_rsp; |
| |
| /* Record the guest's net vcpu time for enforced NMI injections. */ |
| if (unlikely(!enable_vnmi && |
| vmx->loaded_vmcs->soft_vnmi_blocked)) |
| vmx->loaded_vmcs->entry_time = ktime_get(); |
| |
| /* Don't enter VMX if guest state is invalid, let the exit handler |
| start emulation until we arrive back to a valid state */ |
| if (vmx->emulation_required) |
| return; |
| |
| if (vmx->ple_window_dirty) { |
| vmx->ple_window_dirty = false; |
| vmcs_write32(PLE_WINDOW, vmx->ple_window); |
| } |
| |
| if (vmx->nested.sync_shadow_vmcs) { |
| copy_vmcs12_to_shadow(vmx); |
| vmx->nested.sync_shadow_vmcs = false; |
| } |
| |
| if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty)) |
| vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]); |
| if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty)) |
| vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]); |
| |
| cr3 = __get_current_cr3_fast(); |
| if (unlikely(cr3 != vmx->loaded_vmcs->host_state.cr3)) { |
| vmcs_writel(HOST_CR3, cr3); |
| vmx->loaded_vmcs->host_state.cr3 = cr3; |
| } |
| |
| cr4 = cr4_read_shadow(); |
| if (unlikely(cr4 != vmx->loaded_vmcs->host_state.cr4)) { |
| vmcs_writel(HOST_CR4, cr4); |
| vmx->loaded_vmcs->host_state.cr4 = cr4; |
| } |
| |
| /* When single-stepping over STI and MOV SS, we must clear the |
| * corresponding interruptibility bits in the guest state. Otherwise |
| * vmentry fails as it then expects bit 14 (BS) in pending debug |
| * exceptions being set, but that's not correct for the guest debugging |
| * case. */ |
| if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) |
| vmx_set_interrupt_shadow(vcpu, 0); |
| |
| if (static_cpu_has(X86_FEATURE_PKU) && |
| kvm_read_cr4_bits(vcpu, X86_CR4_PKE) && |
| vcpu->arch.pkru != vmx->host_pkru) |
| __write_pkru(vcpu->arch.pkru); |
| |
| atomic_switch_perf_msrs(vmx); |
| |
| vmx_update_hv_timer(vcpu); |
| |
| /* |
| * If this vCPU has touched SPEC_CTRL, restore the guest's value if |
| * it's non-zero. Since vmentry is serialising on affected CPUs, there |
| * is no need to worry about the conditional branch over the wrmsr |
| * being speculatively taken. |
| */ |
| x86_spec_ctrl_set_guest(vmx->spec_ctrl, 0); |
| |
| vmx->__launched = vmx->loaded_vmcs->launched; |
| |
| evmcs_rsp = static_branch_unlikely(&enable_evmcs) ? |
| (unsigned long)¤t_evmcs->host_rsp : 0; |
| |
| if (static_branch_unlikely(&vmx_l1d_should_flush)) |
| vmx_l1d_flush(vcpu); |
| |
| asm( |
| /* Store host registers */ |
| "push %%" _ASM_DX "; push %%" _ASM_BP ";" |
| "push %%" _ASM_CX " \n\t" /* placeholder for guest rcx */ |
| "push %%" _ASM_CX " \n\t" |
| "cmp %%" _ASM_SP ", %c[host_rsp](%0) \n\t" |
| "je 1f \n\t" |
| "mov %%" _ASM_SP ", %c[host_rsp](%0) \n\t" |
| /* Avoid VMWRITE when Enlightened VMCS is in use */ |
| "test %%" _ASM_SI ", %%" _ASM_SI " \n\t" |
| "jz 2f \n\t" |
| "mov %%" _ASM_SP ", (%%" _ASM_SI ") \n\t" |
| "jmp 1f \n\t" |
| "2: \n\t" |
| __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t" |
| "1: \n\t" |
| /* Reload cr2 if changed */ |
| "mov %c[cr2](%0), %%" _ASM_AX " \n\t" |
| "mov %%cr2, %%" _ASM_DX " \n\t" |
| "cmp %%" _ASM_AX ", %%" _ASM_DX " \n\t" |
| "je 3f \n\t" |
| "mov %%" _ASM_AX", %%cr2 \n\t" |
| "3: \n\t" |
| /* Check if vmlaunch of vmresume is needed */ |
| "cmpl $0, %c[launched](%0) \n\t" |
| /* Load guest registers. Don't clobber flags. */ |
| "mov %c[rax](%0), %%" _ASM_AX " \n\t" |
| "mov %c[rbx](%0), %%" _ASM_BX " \n\t" |
| "mov %c[rdx](%0), %%" _ASM_DX " \n\t" |
| "mov %c[rsi](%0), %%" _ASM_SI " \n\t" |
| "mov %c[rdi](%0), %%" _ASM_DI " \n\t" |
| "mov %c[rbp](%0), %%" _ASM_BP " \n\t" |
| #ifdef CONFIG_X86_64 |
| "mov %c[r8](%0), %%r8 \n\t" |
| "mov %c[r9](%0), %%r9 \n\t" |
| "mov %c[r10](%0), %%r10 \n\t" |
| "mov %c[r11](%0), %%r11 \n\t" |
| "mov %c[r12](%0), %%r12 \n\t" |
| "mov %c[r13](%0), %%r13 \n\t" |
| "mov %c[r14](%0), %%r14 \n\t" |
| "mov %c[r15](%0), %%r15 \n\t" |
| #endif |
| "mov %c[rcx](%0), %%" _ASM_CX " \n\t" /* kills %0 (ecx) */ |
| |
| /* Enter guest mode */ |
| "jne 1f \n\t" |
| __ex(ASM_VMX_VMLAUNCH) "\n\t" |
| "jmp 2f \n\t" |
| "1: " __ex(ASM_VMX_VMRESUME) "\n\t" |
| "2: " |
| /* Save guest registers, load host registers, keep flags */ |
| "mov %0, %c[wordsize](%%" _ASM_SP ") \n\t" |
| "pop %0 \n\t" |
| "setbe %c[fail](%0)\n\t" |
| "mov %%" _ASM_AX ", %c[rax](%0) \n\t" |
| "mov %%" _ASM_BX ", %c[rbx](%0) \n\t" |
| __ASM_SIZE(pop) " %c[rcx](%0) \n\t" |
| "mov %%" _ASM_DX ", %c[rdx](%0) \n\t" |
| "mov %%" _ASM_SI ", %c[rsi](%0) \n\t" |
| "mov %%" _ASM_DI ", %c[rdi](%0) \n\t" |
| "mov %%" _ASM_BP ", %c[rbp](%0) \n\t" |
| #ifdef CONFIG_X86_64 |
| "mov %%r8, %c[r8](%0) \n\t" |
| "mov %%r9, %c[r9](%0) \n\t" |
| "mov %%r10, %c[r10](%0) \n\t" |
| "mov %%r11, %c[r11](%0) \n\t" |
| "mov %%r12, %c[r12](%0) \n\t" |
| "mov %%r13, %c[r13](%0) \n\t" |
| "mov %%r14, %c[r14](%0) \n\t" |
| "mov %%r15, %c[r15](%0) \n\t" |
| "xor %%r8d, %%r8d \n\t" |
| "xor %%r9d, %%r9d \n\t" |
| "xor %%r10d, %%r10d \n\t" |
| "xor %%r11d, %%r11d \n\t" |
| "xor %%r12d, %%r12d \n\t" |
| "xor %%r13d, %%r13d \n\t" |
| "xor %%r14d, %%r14d \n\t" |
| "xor %%r15d, %%r15d \n\t" |
| #endif |
| "mov %%cr2, %%" _ASM_AX " \n\t" |
| "mov %%" _ASM_AX ", %c[cr2](%0) \n\t" |
| |
| "xor %%eax, %%eax \n\t" |
| "xor %%ebx, %%ebx \n\t" |
| "xor %%esi, %%esi \n\t" |
| "xor %%edi, %%edi \n\t" |
| "pop %%" _ASM_BP "; pop %%" _ASM_DX " \n\t" |
| ".pushsection .rodata \n\t" |
| ".global vmx_return \n\t" |
| "vmx_return: " _ASM_PTR " 2b \n\t" |
| ".popsection" |
| : : "c"(vmx), "d"((unsigned long)HOST_RSP), "S"(evmcs_rsp), |
| [launched]"i"(offsetof(struct vcpu_vmx, __launched)), |
| [fail]"i"(offsetof(struct vcpu_vmx, fail)), |
| [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)), |
| [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])), |
| [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])), |
| [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])), |
| [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])), |
| [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])), |
| [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])), |
| [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])), |
| #ifdef CONFIG_X86_64 |
| [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])), |
| [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])), |
| [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])), |
| [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])), |
| [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])), |
| [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])), |
| [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])), |
| [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])), |
| #endif |
| [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2)), |
| [wordsize]"i"(sizeof(ulong)) |
| : "cc", "memory" |
| #ifdef CONFIG_X86_64 |
| , "rax", "rbx", "rdi" |
| , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15" |
| #else |
| , "eax", "ebx", "edi" |
| #endif |
| ); |
| |
| /* |
| * We do not use IBRS in the kernel. If this vCPU has used the |
| * SPEC_CTRL MSR it may have left it on; save the value and |
| * turn it off. This is much more efficient than blindly adding |
| * it to the atomic save/restore list. Especially as the former |
| * (Saving guest MSRs on vmexit) doesn't even exist in KVM. |
| * |
| * For non-nested case: |
| * If the L01 MSR bitmap does not intercept the MSR, then we need to |
| * save it. |
| * |
| * For nested case: |
| * If the L02 MSR bitmap does not intercept the MSR, then we need to |
| * save it. |
| */ |
| if (unlikely(!msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL))) |
| vmx->spec_ctrl = native_read_msr(MSR_IA32_SPEC_CTRL); |
| |
| x86_spec_ctrl_restore_host(vmx->spec_ctrl, 0); |
| |
| /* Eliminate branch target predictions from guest mode */ |
| vmexit_fill_RSB(); |
| |
| /* All fields are clean at this point */ |
| if (static_branch_unlikely(&enable_evmcs)) |
| current_evmcs->hv_clean_fields |= |
| HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL; |
| |
| /* MSR_IA32_DEBUGCTLMSR is zeroed on vmexit. Restore it if needed */ |
| if (vmx->host_debugctlmsr) |
| update_debugctlmsr(vmx->host_debugctlmsr); |
| |
| #ifndef CONFIG_X86_64 |
| /* |
| * The sysexit path does not restore ds/es, so we must set them to |
| * a reasonable value ourselves. |
| * |
| * We can't defer this to vmx_prepare_switch_to_host() since that |
| * function may be executed in interrupt context, which saves and |
| * restore segments around it, nullifying its effect. |
| */ |
| loadsegment(ds, __USER_DS); |
| loadsegment(es, __USER_DS); |
| #endif |
| |
| vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP) |
| | (1 << VCPU_EXREG_RFLAGS) |
| | (1 << VCPU_EXREG_PDPTR) |
| | (1 << VCPU_EXREG_SEGMENTS) |
| | (1 << VCPU_EXREG_CR3)); |
| vcpu->arch.regs_dirty = 0; |
| |
| /* |
| * eager fpu is enabled if PKEY is supported and CR4 is switched |
| * back on host, so it is safe to read guest PKRU from current |
| * XSAVE. |
| */ |
| if (static_cpu_has(X86_FEATURE_PKU) && |
| kvm_read_cr4_bits(vcpu, X86_CR4_PKE)) { |
| vcpu->arch.pkru = __read_pkru(); |
| if (vcpu->arch.pkru != vmx->host_pkru) |
| __write_pkru(vmx->host_pkru); |
| } |
| |
| vmx->nested.nested_run_pending = 0; |
| vmx->idt_vectoring_info = 0; |
| |
| vmx->exit_reason = vmx->fail ? 0xdead : vmcs_read32(VM_EXIT_REASON); |
| if (vmx->fail || (vmx->exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) |
| return; |
| |
| vmx->loaded_vmcs->launched = 1; |
| vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD); |
| |
| vmx_complete_atomic_exit(vmx); |
| vmx_recover_nmi_blocking(vmx); |
| vmx_complete_interrupts(vmx); |
| } |
| STACK_FRAME_NON_STANDARD(vmx_vcpu_run); |
| |
| static struct kvm *vmx_vm_alloc(void) |
| { |
| struct kvm_vmx *kvm_vmx = vzalloc(sizeof(struct kvm_vmx)); |
| return &kvm_vmx->kvm; |
| } |
| |
| static void vmx_vm_free(struct kvm *kvm) |
| { |
| vfree(to_kvm_vmx(kvm)); |
| } |
| |
| static void vmx_switch_vmcs(struct kvm_vcpu *vcpu, struct loaded_vmcs *vmcs) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| int cpu; |
| |
| if (vmx->loaded_vmcs == vmcs) |
| return; |
| |
| cpu = get_cpu(); |
| vmx_vcpu_put(vcpu); |
| vmx->loaded_vmcs = vmcs; |
| vmx_vcpu_load(vcpu, cpu); |
| put_cpu(); |
| |
| vm_entry_controls_reset_shadow(vmx); |
| vm_exit_controls_reset_shadow(vmx); |
| vmx_segment_cache_clear(vmx); |
| } |
| |
| /* |
| * Ensure that the current vmcs of the logical processor is the |
| * vmcs01 of the vcpu before calling free_nested(). |
| */ |
| static void vmx_free_vcpu_nested(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| vcpu_load(vcpu); |
| vmx_switch_vmcs(vcpu, &vmx->vmcs01); |
| free_nested(vmx); |
| vcpu_put(vcpu); |
| } |
| |
| static void vmx_free_vcpu(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| if (enable_pml) |
| vmx_destroy_pml_buffer(vmx); |
| free_vpid(vmx->vpid); |
| leave_guest_mode(vcpu); |
| vmx_free_vcpu_nested(vcpu); |
| free_loaded_vmcs(vmx->loaded_vmcs); |
| kfree(vmx->guest_msrs); |
| kvm_vcpu_uninit(vcpu); |
| kmem_cache_free(kvm_vcpu_cache, vmx); |
| } |
| |
| static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id) |
| { |
| int err; |
| struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); |
| unsigned long *msr_bitmap; |
| int cpu; |
| |
| if (!vmx) |
| return ERR_PTR(-ENOMEM); |
| |
| vmx->vpid = allocate_vpid(); |
| |
| err = kvm_vcpu_init(&vmx->vcpu, kvm, id); |
| if (err) |
| goto free_vcpu; |
| |
| err = -ENOMEM; |
| |
| /* |
| * If PML is turned on, failure on enabling PML just results in failure |
| * of creating the vcpu, therefore we can simplify PML logic (by |
| * avoiding dealing with cases, such as enabling PML partially on vcpus |
| * for the guest, etc. |
| */ |
| if (enable_pml) { |
| vmx->pml_pg = alloc_page(GFP_KERNEL | __GFP_ZERO); |
| if (!vmx->pml_pg) |
| goto uninit_vcpu; |
| } |
| |
| vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| BUILD_BUG_ON(ARRAY_SIZE(vmx_msr_index) * sizeof(vmx->guest_msrs[0]) |
| > PAGE_SIZE); |
| |
| if (!vmx->guest_msrs) |
| goto free_pml; |
| |
| err = alloc_loaded_vmcs(&vmx->vmcs01); |
| if (err < 0) |
| goto free_msrs; |
| |
| msr_bitmap = vmx->vmcs01.msr_bitmap; |
| vmx_disable_intercept_for_msr(msr_bitmap, MSR_FS_BASE, MSR_TYPE_RW); |
| vmx_disable_intercept_for_msr(msr_bitmap, MSR_GS_BASE, MSR_TYPE_RW); |
| vmx_disable_intercept_for_msr(msr_bitmap, MSR_KERNEL_GS_BASE, MSR_TYPE_RW); |
| vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_CS, MSR_TYPE_RW); |
| vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_ESP, MSR_TYPE_RW); |
| vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_SYSENTER_EIP, MSR_TYPE_RW); |
| vmx->msr_bitmap_mode = 0; |
| |
| vmx->loaded_vmcs = &vmx->vmcs01; |
| cpu = get_cpu(); |
| vmx_vcpu_load(&vmx->vcpu, cpu); |
| vmx->vcpu.cpu = cpu; |
| vmx_vcpu_setup(vmx); |
| vmx_vcpu_put(&vmx->vcpu); |
| put_cpu(); |
| if (cpu_need_virtualize_apic_accesses(&vmx->vcpu)) { |
| err = alloc_apic_access_page(kvm); |
| if (err) |
| goto free_vmcs; |
| } |
| |
| if (enable_ept && !enable_unrestricted_guest) { |
| err = init_rmode_identity_map(kvm); |
| if (err) |
| goto free_vmcs; |
| } |
| |
| if (nested) |
| nested_vmx_setup_ctls_msrs(&vmx->nested.msrs, |
| kvm_vcpu_apicv_active(&vmx->vcpu)); |
| |
| vmx->nested.posted_intr_nv = -1; |
| vmx->nested.current_vmptr = -1ull; |
| |
| vmx->msr_ia32_feature_control_valid_bits = FEATURE_CONTROL_LOCKED; |
| |
| /* |
| * Enforce invariant: pi_desc.nv is always either POSTED_INTR_VECTOR |
| * or POSTED_INTR_WAKEUP_VECTOR. |
| */ |
| vmx->pi_desc.nv = POSTED_INTR_VECTOR; |
| vmx->pi_desc.sn = 1; |
| |
| return &vmx->vcpu; |
| |
| free_vmcs: |
| free_loaded_vmcs(vmx->loaded_vmcs); |
| free_msrs: |
| kfree(vmx->guest_msrs); |
| free_pml: |
| vmx_destroy_pml_buffer(vmx); |
| uninit_vcpu: |
| kvm_vcpu_uninit(&vmx->vcpu); |
| free_vcpu: |
| free_vpid(vmx->vpid); |
| kmem_cache_free(kvm_vcpu_cache, vmx); |
| return ERR_PTR(err); |
| } |
| |
| #define L1TF_MSG_SMT "L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html for details.\n" |
| #define L1TF_MSG_L1D "L1TF CPU bug present and virtualization mitigation disabled, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html for details.\n" |
| |
| static int vmx_vm_init(struct kvm *kvm) |
| { |
| spin_lock_init(&to_kvm_vmx(kvm)->ept_pointer_lock); |
| |
| if (!ple_gap) |
| kvm->arch.pause_in_guest = true; |
| |
| if (boot_cpu_has(X86_BUG_L1TF) && enable_ept) { |
| switch (l1tf_mitigation) { |
| case L1TF_MITIGATION_OFF: |
| case L1TF_MITIGATION_FLUSH_NOWARN: |
| /* 'I explicitly don't care' is set */ |
| break; |
| case L1TF_MITIGATION_FLUSH: |
| case L1TF_MITIGATION_FLUSH_NOSMT: |
| case L1TF_MITIGATION_FULL: |
| /* |
| * Warn upon starting the first VM in a potentially |
| * insecure environment. |
| */ |
| if (cpu_smt_control == CPU_SMT_ENABLED) |
| pr_warn_once(L1TF_MSG_SMT); |
| if (l1tf_vmx_mitigation == VMENTER_L1D_FLUSH_NEVER) |
| pr_warn_once(L1TF_MSG_L1D); |
| break; |
| case L1TF_MITIGATION_FULL_FORCE: |
| /* Flush is enforced */ |
| break; |
| } |
| } |
| return 0; |
| } |
| |
| static void __init vmx_check_processor_compat(void *rtn) |
| { |
| struct vmcs_config vmcs_conf; |
| |
| *(int *)rtn = 0; |
| if (setup_vmcs_config(&vmcs_conf) < 0) |
| *(int *)rtn = -EIO; |
| nested_vmx_setup_ctls_msrs(&vmcs_conf.nested, enable_apicv); |
| if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) { |
| printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n", |
| smp_processor_id()); |
| *(int *)rtn = -EIO; |
| } |
| } |
| |
| static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio) |
| { |
| u8 cache; |
| u64 ipat = 0; |
| |
| /* For VT-d and EPT combination |
| * 1. MMIO: always map as UC |
| * 2. EPT with VT-d: |
| * a. VT-d without snooping control feature: can't guarantee the |
| * result, try to trust guest. |
| * b. VT-d with snooping control feature: snooping control feature of |
| * VT-d engine can guarantee the cache correctness. Just set it |
| * to WB to keep consistent with host. So the same as item 3. |
| * 3. EPT without VT-d: always map as WB and set IPAT=1 to keep |
| * consistent with host MTRR |
| */ |
| if (is_mmio) { |
| cache = MTRR_TYPE_UNCACHABLE; |
| goto exit; |
| } |
| |
| if (!kvm_arch_has_noncoherent_dma(vcpu->kvm)) { |
| ipat = VMX_EPT_IPAT_BIT; |
| cache = MTRR_TYPE_WRBACK; |
| goto exit; |
| } |
| |
| if (kvm_read_cr0(vcpu) & X86_CR0_CD) { |
| ipat = VMX_EPT_IPAT_BIT; |
| if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED)) |
| cache = MTRR_TYPE_WRBACK; |
| else |
| cache = MTRR_TYPE_UNCACHABLE; |
| goto exit; |
| } |
| |
| cache = kvm_mtrr_get_guest_memory_type(vcpu, gfn); |
| |
| exit: |
| return (cache << VMX_EPT_MT_EPTE_SHIFT) | ipat; |
| } |
| |
| static int vmx_get_lpage_level(void) |
| { |
| if (enable_ept && !cpu_has_vmx_ept_1g_page()) |
| return PT_DIRECTORY_LEVEL; |
| else |
| /* For shadow and EPT supported 1GB page */ |
| return PT_PDPE_LEVEL; |
| } |
| |
| static void vmcs_set_secondary_exec_control(u32 new_ctl) |
| { |
| /* |
| * These bits in the secondary execution controls field |
| * are dynamic, the others are mostly based on the hypervisor |
| * architecture and the guest's CPUID. Do not touch the |
| * dynamic bits. |
| */ |
| u32 mask = |
| SECONDARY_EXEC_SHADOW_VMCS | |
| SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE | |
| SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | |
| SECONDARY_EXEC_DESC; |
| |
| u32 cur_ctl = vmcs_read32(SECONDARY_VM_EXEC_CONTROL); |
| |
| vmcs_write32(SECONDARY_VM_EXEC_CONTROL, |
| (new_ctl & ~mask) | (cur_ctl & mask)); |
| } |
| |
| /* |
| * Generate MSR_IA32_VMX_CR{0,4}_FIXED1 according to CPUID. Only set bits |
| * (indicating "allowed-1") if they are supported in the guest's CPUID. |
| */ |
| static void nested_vmx_cr_fixed1_bits_update(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct kvm_cpuid_entry2 *entry; |
| |
| vmx->nested.msrs.cr0_fixed1 = 0xffffffff; |
| vmx->nested.msrs.cr4_fixed1 = X86_CR4_PCE; |
| |
| #define cr4_fixed1_update(_cr4_mask, _reg, _cpuid_mask) do { \ |
| if (entry && (entry->_reg & (_cpuid_mask))) \ |
| vmx->nested.msrs.cr4_fixed1 |= (_cr4_mask); \ |
| } while (0) |
| |
| entry = kvm_find_cpuid_entry(vcpu, 0x1, 0); |
| cr4_fixed1_update(X86_CR4_VME, edx, bit(X86_FEATURE_VME)); |
| cr4_fixed1_update(X86_CR4_PVI, edx, bit(X86_FEATURE_VME)); |
| cr4_fixed1_update(X86_CR4_TSD, edx, bit(X86_FEATURE_TSC)); |
| cr4_fixed1_update(X86_CR4_DE, edx, bit(X86_FEATURE_DE)); |
| cr4_fixed1_update(X86_CR4_PSE, edx, bit(X86_FEATURE_PSE)); |
| cr4_fixed1_update(X86_CR4_PAE, edx, bit(X86_FEATURE_PAE)); |
| cr4_fixed1_update(X86_CR4_MCE, edx, bit(X86_FEATURE_MCE)); |
| cr4_fixed1_update(X86_CR4_PGE, edx, bit(X86_FEATURE_PGE)); |
| cr4_fixed1_update(X86_CR4_OSFXSR, edx, bit(X86_FEATURE_FXSR)); |
| cr4_fixed1_update(X86_CR4_OSXMMEXCPT, edx, bit(X86_FEATURE_XMM)); |
| cr4_fixed1_update(X86_CR4_VMXE, ecx, bit(X86_FEATURE_VMX)); |
| cr4_fixed1_update(X86_CR4_SMXE, ecx, bit(X86_FEATURE_SMX)); |
| cr4_fixed1_update(X86_CR4_PCIDE, ecx, bit(X86_FEATURE_PCID)); |
| cr4_fixed1_update(X86_CR4_OSXSAVE, ecx, bit(X86_FEATURE_XSAVE)); |
| |
| entry = kvm_find_cpuid_entry(vcpu, 0x7, 0); |
| cr4_fixed1_update(X86_CR4_FSGSBASE, ebx, bit(X86_FEATURE_FSGSBASE)); |
| cr4_fixed1_update(X86_CR4_SMEP, ebx, bit(X86_FEATURE_SMEP)); |
| cr4_fixed1_update(X86_CR4_SMAP, ebx, bit(X86_FEATURE_SMAP)); |
| cr4_fixed1_update(X86_CR4_PKE, ecx, bit(X86_FEATURE_PKU)); |
| cr4_fixed1_update(X86_CR4_UMIP, ecx, bit(X86_FEATURE_UMIP)); |
| |
| #undef cr4_fixed1_update |
| } |
| |
| static void nested_vmx_entry_exit_ctls_update(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| if (kvm_mpx_supported()) { |
| bool mpx_enabled = guest_cpuid_has(vcpu, X86_FEATURE_MPX); |
| |
| if (mpx_enabled) { |
| vmx->nested.msrs.entry_ctls_high |= VM_ENTRY_LOAD_BNDCFGS; |
| vmx->nested.msrs.exit_ctls_high |= VM_EXIT_CLEAR_BNDCFGS; |
| } else { |
| vmx->nested.msrs.entry_ctls_high &= ~VM_ENTRY_LOAD_BNDCFGS; |
| vmx->nested.msrs.exit_ctls_high &= ~VM_EXIT_CLEAR_BNDCFGS; |
| } |
| } |
| } |
| |
| static void vmx_cpuid_update(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| if (cpu_has_secondary_exec_ctrls()) { |
| vmx_compute_secondary_exec_control(vmx); |
| vmcs_set_secondary_exec_control(vmx->secondary_exec_control); |
| } |
| |
| if (nested_vmx_allowed(vcpu)) |
| to_vmx(vcpu)->msr_ia32_feature_control_valid_bits |= |
| FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX; |
| else |
| to_vmx(vcpu)->msr_ia32_feature_control_valid_bits &= |
| ~FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX; |
| |
| if (nested_vmx_allowed(vcpu)) { |
| nested_vmx_cr_fixed1_bits_update(vcpu); |
| nested_vmx_entry_exit_ctls_update(vcpu); |
| } |
| } |
| |
| static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry) |
| { |
| if (func == 1 && nested) |
| entry->ecx |= bit(X86_FEATURE_VMX); |
| } |
| |
| static void nested_ept_inject_page_fault(struct kvm_vcpu *vcpu, |
| struct x86_exception *fault) |
| { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| u32 exit_reason; |
| unsigned long exit_qualification = vcpu->arch.exit_qualification; |
| |
| if (vmx->nested.pml_full) { |
| exit_reason = EXIT_REASON_PML_FULL; |
| vmx->nested.pml_full = false; |
| exit_qualification &= INTR_INFO_UNBLOCK_NMI; |
| } else if (fault->error_code & PFERR_RSVD_MASK) |
| exit_reason = EXIT_REASON_EPT_MISCONFIG; |
| else |
| exit_reason = EXIT_REASON_EPT_VIOLATION; |
| |
| nested_vmx_vmexit(vcpu, exit_reason, 0, exit_qualification); |
| vmcs12->guest_physical_address = fault->address; |
| } |
| |
| static bool nested_ept_ad_enabled(struct kvm_vcpu *vcpu) |
| { |
| return nested_ept_get_cr3(vcpu) & VMX_EPTP_AD_ENABLE_BIT; |
| } |
| |
| /* Callbacks for nested_ept_init_mmu_context: */ |
| |
| static unsigned long nested_ept_get_cr3(struct kvm_vcpu *vcpu) |
| { |
| /* return the page table to be shadowed - in our case, EPT12 */ |
| return get_vmcs12(vcpu)->ept_pointer; |
| } |
| |
| static void nested_ept_init_mmu_context(struct kvm_vcpu *vcpu) |
| { |
| WARN_ON(mmu_is_nested(vcpu)); |
| |
| kvm_init_shadow_ept_mmu(vcpu, |
| to_vmx(vcpu)->nested.msrs.ept_caps & |
| VMX_EPT_EXECUTE_ONLY_BIT, |
| nested_ept_ad_enabled(vcpu), |
| nested_ept_get_cr3(vcpu)); |
| vcpu->arch.mmu->set_cr3 = vmx_set_cr3; |
| vcpu->arch.mmu->get_cr3 = nested_ept_get_cr3; |
| vcpu->arch.mmu->inject_page_fault = nested_ept_inject_page_fault; |
| vcpu->arch.mmu->get_pdptr = kvm_pdptr_read; |
| |
| vcpu->arch.walk_mmu = &vcpu->arch.nested_mmu; |
| } |
| |
| static void nested_ept_uninit_mmu_context(struct kvm_vcpu *vcpu) |
| { |
| vcpu->arch.walk_mmu = &vcpu->arch.root_mmu; |
| } |
| |
| static bool nested_vmx_is_page_fault_vmexit(struct vmcs12 *vmcs12, |
| u16 error_code) |
| { |
| bool inequality, bit; |
| |
| bit = (vmcs12->exception_bitmap & (1u << PF_VECTOR)) != 0; |
| inequality = |
| (error_code & vmcs12->page_fault_error_code_mask) != |
| vmcs12->page_fault_error_code_match; |
| return inequality ^ bit; |
| } |
| |
| static void vmx_inject_page_fault_nested(struct kvm_vcpu *vcpu, |
| struct x86_exception *fault) |
| { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| |
| WARN_ON(!is_guest_mode(vcpu)); |
| |
| if (nested_vmx_is_page_fault_vmexit(vmcs12, fault->error_code) && |
| !to_vmx(vcpu)->nested.nested_run_pending) { |
| vmcs12->vm_exit_intr_error_code = fault->error_code; |
| nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI, |
| PF_VECTOR | INTR_TYPE_HARD_EXCEPTION | |
| INTR_INFO_DELIVER_CODE_MASK | INTR_INFO_VALID_MASK, |
| fault->address); |
| } else { |
| kvm_inject_page_fault(vcpu, fault); |
| } |
| } |
| |
| static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12); |
| |
| static void nested_get_vmcs12_pages(struct kvm_vcpu *vcpu) |
| { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct page *page; |
| u64 hpa; |
| |
| if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) { |
| /* |
| * Translate L1 physical address to host physical |
| * address for vmcs02. Keep the page pinned, so this |
| * physical address remains valid. We keep a reference |
| * to it so we can release it later. |
| */ |
| if (vmx->nested.apic_access_page) { /* shouldn't happen */ |
| kvm_release_page_dirty(vmx->nested.apic_access_page); |
| vmx->nested.apic_access_page = NULL; |
| } |
| page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->apic_access_addr); |
| /* |
| * If translation failed, no matter: This feature asks |
| * to exit when accessing the given address, and if it |
| * can never be accessed, this feature won't do |
| * anything anyway. |
| */ |
| if (!is_error_page(page)) { |
| vmx->nested.apic_access_page = page; |
| hpa = page_to_phys(vmx->nested.apic_access_page); |
| vmcs_write64(APIC_ACCESS_ADDR, hpa); |
| } else { |
| vmcs_clear_bits(SECONDARY_VM_EXEC_CONTROL, |
| SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES); |
| } |
| } |
| |
| if (nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) { |
| if (vmx->nested.virtual_apic_page) { /* shouldn't happen */ |
| kvm_release_page_dirty(vmx->nested.virtual_apic_page); |
| vmx->nested.virtual_apic_page = NULL; |
| } |
| page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->virtual_apic_page_addr); |
| |
| /* |
| * If translation failed, VM entry will fail because |
| * prepare_vmcs02 set VIRTUAL_APIC_PAGE_ADDR to -1ull. |
| * Failing the vm entry is _not_ what the processor |
| * does but it's basically the only possibility we |
| * have. We could still enter the guest if CR8 load |
| * exits are enabled, CR8 store exits are enabled, and |
| * virtualize APIC access is disabled; in this case |
| * the processor would never use the TPR shadow and we |
| * could simply clear the bit from the execution |
| * control. But such a configuration is useless, so |
| * let's keep the code simple. |
| */ |
| if (!is_error_page(page)) { |
| vmx->nested.virtual_apic_page = page; |
| hpa = page_to_phys(vmx->nested.virtual_apic_page); |
| vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, hpa); |
| } |
| } |
| |
| if (nested_cpu_has_posted_intr(vmcs12)) { |
| if (vmx->nested.pi_desc_page) { /* shouldn't happen */ |
| kunmap(vmx->nested.pi_desc_page); |
| kvm_release_page_dirty(vmx->nested.pi_desc_page); |
| vmx->nested.pi_desc_page = NULL; |
| } |
| page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->posted_intr_desc_addr); |
| if (is_error_page(page)) |
| return; |
| vmx->nested.pi_desc_page = page; |
| vmx->nested.pi_desc = kmap(vmx->nested.pi_desc_page); |
| vmx->nested.pi_desc = |
| (struct pi_desc *)((void *)vmx->nested.pi_desc + |
| (unsigned long)(vmcs12->posted_intr_desc_addr & |
| (PAGE_SIZE - 1))); |
| vmcs_write64(POSTED_INTR_DESC_ADDR, |
| page_to_phys(vmx->nested.pi_desc_page) + |
| (unsigned long)(vmcs12->posted_intr_desc_addr & |
| (PAGE_SIZE - 1))); |
| } |
| if (nested_vmx_prepare_msr_bitmap(vcpu, vmcs12)) |
| vmcs_set_bits(CPU_BASED_VM_EXEC_CONTROL, |
| CPU_BASED_USE_MSR_BITMAPS); |
| else |
| vmcs_clear_bits(CPU_BASED_VM_EXEC_CONTROL, |
| CPU_BASED_USE_MSR_BITMAPS); |
| } |
| |
| static void vmx_start_preemption_timer(struct kvm_vcpu *vcpu) |
| { |
| u64 preemption_timeout = get_vmcs12(vcpu)->vmx_preemption_timer_value; |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| /* |
| * A timer value of zero is architecturally guaranteed to cause |
| * a VMExit prior to executing any instructions in the guest. |
| */ |
| if (preemption_timeout == 0) { |
| vmx_preemption_timer_fn(&vmx->nested.preemption_timer); |
| return; |
| } |
| |
| if (vcpu->arch.virtual_tsc_khz == 0) |
| return; |
| |
| preemption_timeout <<= VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE; |
| preemption_timeout *= 1000000; |
| do_div(preemption_timeout, vcpu->arch.virtual_tsc_khz); |
| hrtimer_start(&vmx->nested.preemption_timer, |
| ns_to_ktime(preemption_timeout), HRTIMER_MODE_REL); |
| } |
| |
| static int nested_vmx_check_io_bitmap_controls(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| if (!nested_cpu_has(vmcs12, CPU_BASED_USE_IO_BITMAPS)) |
| return 0; |
| |
| if (!page_address_valid(vcpu, vmcs12->io_bitmap_a) || |
| !page_address_valid(vcpu, vmcs12->io_bitmap_b)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int nested_vmx_check_msr_bitmap_controls(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| if (!nested_cpu_has(vmcs12, CPU_BASED_USE_MSR_BITMAPS)) |
| return 0; |
| |
| if (!page_address_valid(vcpu, vmcs12->msr_bitmap)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int nested_vmx_check_tpr_shadow_controls(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| if (!nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) |
| return 0; |
| |
| if (!page_address_valid(vcpu, vmcs12->virtual_apic_page_addr)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| /* |
| * Merge L0's and L1's MSR bitmap, return false to indicate that |
| * we do not use the hardware. |
| */ |
| static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| int msr; |
| struct page *page; |
| unsigned long *msr_bitmap_l1; |
| unsigned long *msr_bitmap_l0 = to_vmx(vcpu)->nested.vmcs02.msr_bitmap; |
| /* |
| * pred_cmd & spec_ctrl are trying to verify two things: |
| * |
| * 1. L0 gave a permission to L1 to actually passthrough the MSR. This |
| * ensures that we do not accidentally generate an L02 MSR bitmap |
| * from the L12 MSR bitmap that is too permissive. |
| * 2. That L1 or L2s have actually used the MSR. This avoids |
| * unnecessarily merging of the bitmap if the MSR is unused. This |
| * works properly because we only update the L01 MSR bitmap lazily. |
| * So even if L0 should pass L1 these MSRs, the L01 bitmap is only |
| * updated to reflect this when L1 (or its L2s) actually write to |
| * the MSR. |
| */ |
| bool pred_cmd = !msr_write_intercepted_l01(vcpu, MSR_IA32_PRED_CMD); |
| bool spec_ctrl = !msr_write_intercepted_l01(vcpu, MSR_IA32_SPEC_CTRL); |
| |
| /* Nothing to do if the MSR bitmap is not in use. */ |
| if (!cpu_has_vmx_msr_bitmap() || |
| !nested_cpu_has(vmcs12, CPU_BASED_USE_MSR_BITMAPS)) |
| return false; |
| |
| if (!nested_cpu_has_virt_x2apic_mode(vmcs12) && |
| !pred_cmd && !spec_ctrl) |
| return false; |
| |
| page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->msr_bitmap); |
| if (is_error_page(page)) |
| return false; |
| |
| msr_bitmap_l1 = (unsigned long *)kmap(page); |
| if (nested_cpu_has_apic_reg_virt(vmcs12)) { |
| /* |
| * L0 need not intercept reads for MSRs between 0x800 and 0x8ff, it |
| * just lets the processor take the value from the virtual-APIC page; |
| * take those 256 bits directly from the L1 bitmap. |
| */ |
| for (msr = 0x800; msr <= 0x8ff; msr += BITS_PER_LONG) { |
| unsigned word = msr / BITS_PER_LONG; |
| msr_bitmap_l0[word] = msr_bitmap_l1[word]; |
| msr_bitmap_l0[word + (0x800 / sizeof(long))] = ~0; |
| } |
| } else { |
| for (msr = 0x800; msr <= 0x8ff; msr += BITS_PER_LONG) { |
| unsigned word = msr / BITS_PER_LONG; |
| msr_bitmap_l0[word] = ~0; |
| msr_bitmap_l0[word + (0x800 / sizeof(long))] = ~0; |
| } |
| } |
| |
| nested_vmx_disable_intercept_for_msr( |
| msr_bitmap_l1, msr_bitmap_l0, |
| X2APIC_MSR(APIC_TASKPRI), |
| MSR_TYPE_W); |
| |
| if (nested_cpu_has_vid(vmcs12)) { |
| nested_vmx_disable_intercept_for_msr( |
| msr_bitmap_l1, msr_bitmap_l0, |
| X2APIC_MSR(APIC_EOI), |
| MSR_TYPE_W); |
| nested_vmx_disable_intercept_for_msr( |
| msr_bitmap_l1, msr_bitmap_l0, |
| X2APIC_MSR(APIC_SELF_IPI), |
| MSR_TYPE_W); |
| } |
| |
| if (spec_ctrl) |
| nested_vmx_disable_intercept_for_msr( |
| msr_bitmap_l1, msr_bitmap_l0, |
| MSR_IA32_SPEC_CTRL, |
| MSR_TYPE_R | MSR_TYPE_W); |
| |
| if (pred_cmd) |
| nested_vmx_disable_intercept_for_msr( |
| msr_bitmap_l1, msr_bitmap_l0, |
| MSR_IA32_PRED_CMD, |
| MSR_TYPE_W); |
| |
| kunmap(page); |
| kvm_release_page_clean(page); |
| |
| return true; |
| } |
| |
| static void nested_cache_shadow_vmcs12(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| struct vmcs12 *shadow; |
| struct page *page; |
| |
| if (!nested_cpu_has_shadow_vmcs(vmcs12) || |
| vmcs12->vmcs_link_pointer == -1ull) |
| return; |
| |
| shadow = get_shadow_vmcs12(vcpu); |
| page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->vmcs_link_pointer); |
| |
| memcpy(shadow, kmap(page), VMCS12_SIZE); |
| |
| kunmap(page); |
| kvm_release_page_clean(page); |
| } |
| |
| static void nested_flush_cached_shadow_vmcs12(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| if (!nested_cpu_has_shadow_vmcs(vmcs12) || |
| vmcs12->vmcs_link_pointer == -1ull) |
| return; |
| |
| kvm_write_guest(vmx->vcpu.kvm, vmcs12->vmcs_link_pointer, |
| get_shadow_vmcs12(vcpu), VMCS12_SIZE); |
| } |
| |
| static int nested_vmx_check_apic_access_controls(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) && |
| !page_address_valid(vcpu, vmcs12->apic_access_addr)) |
| return -EINVAL; |
| else |
| return 0; |
| } |
| |
| static int nested_vmx_check_apicv_controls(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| if (!nested_cpu_has_virt_x2apic_mode(vmcs12) && |
| !nested_cpu_has_apic_reg_virt(vmcs12) && |
| !nested_cpu_has_vid(vmcs12) && |
| !nested_cpu_has_posted_intr(vmcs12)) |
| return 0; |
| |
| /* |
| * If virtualize x2apic mode is enabled, |
| * virtualize apic access must be disabled. |
| */ |
| if (nested_cpu_has_virt_x2apic_mode(vmcs12) && |
| nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) |
| return -EINVAL; |
| |
| /* |
| * If virtual interrupt delivery is enabled, |
| * we must exit on external interrupts. |
| */ |
| if (nested_cpu_has_vid(vmcs12) && |
| !nested_exit_on_intr(vcpu)) |
| return -EINVAL; |
| |
| /* |
| * bits 15:8 should be zero in posted_intr_nv, |
| * the descriptor address has been already checked |
| * in nested_get_vmcs12_pages. |
| * |
| * bits 5:0 of posted_intr_desc_addr should be zero. |
| */ |
| if (nested_cpu_has_posted_intr(vmcs12) && |
| (!nested_cpu_has_vid(vmcs12) || |
| !nested_exit_intr_ack_set(vcpu) || |
| (vmcs12->posted_intr_nv & 0xff00) || |
| (vmcs12->posted_intr_desc_addr & 0x3f) || |
| (!page_address_valid(vcpu, vmcs12->posted_intr_desc_addr)))) |
| return -EINVAL; |
| |
| /* tpr shadow is needed by all apicv features. */ |
| if (!nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int nested_vmx_check_msr_switch(struct kvm_vcpu *vcpu, |
| unsigned long count_field, |
| unsigned long addr_field) |
| { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| int maxphyaddr; |
| u64 count, addr; |
| |
| if (vmcs12_read_any(vmcs12, count_field, &count) || |
| vmcs12_read_any(vmcs12, addr_field, &addr)) { |
| WARN_ON(1); |
| return -EINVAL; |
| } |
| if (count == 0) |
| return 0; |
| maxphyaddr = cpuid_maxphyaddr(vcpu); |
| if (!IS_ALIGNED(addr, 16) || addr >> maxphyaddr || |
| (addr + count * sizeof(struct vmx_msr_entry) - 1) >> maxphyaddr) { |
| pr_debug_ratelimited( |
| "nVMX: invalid MSR switch (0x%lx, %d, %llu, 0x%08llx)", |
| addr_field, maxphyaddr, count, addr); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static int nested_vmx_check_msr_switch_controls(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| if (vmcs12->vm_exit_msr_load_count == 0 && |
| vmcs12->vm_exit_msr_store_count == 0 && |
| vmcs12->vm_entry_msr_load_count == 0) |
| return 0; /* Fast path */ |
| if (nested_vmx_check_msr_switch(vcpu, VM_EXIT_MSR_LOAD_COUNT, |
| VM_EXIT_MSR_LOAD_ADDR) || |
| nested_vmx_check_msr_switch(vcpu, VM_EXIT_MSR_STORE_COUNT, |
| VM_EXIT_MSR_STORE_ADDR) || |
| nested_vmx_check_msr_switch(vcpu, VM_ENTRY_MSR_LOAD_COUNT, |
| VM_ENTRY_MSR_LOAD_ADDR)) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static int nested_vmx_check_pml_controls(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| if (!nested_cpu_has_pml(vmcs12)) |
| return 0; |
| |
| if (!nested_cpu_has_ept(vmcs12) || |
| !page_address_valid(vcpu, vmcs12->pml_address)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int nested_vmx_check_shadow_vmcs_controls(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| if (!nested_cpu_has_shadow_vmcs(vmcs12)) |
| return 0; |
| |
| if (!page_address_valid(vcpu, vmcs12->vmread_bitmap) || |
| !page_address_valid(vcpu, vmcs12->vmwrite_bitmap)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int nested_vmx_msr_check_common(struct kvm_vcpu *vcpu, |
| struct vmx_msr_entry *e) |
| { |
| /* x2APIC MSR accesses are not allowed */ |
| if (vcpu->arch.apic_base & X2APIC_ENABLE && e->index >> 8 == 0x8) |
| return -EINVAL; |
| if (e->index == MSR_IA32_UCODE_WRITE || /* SDM Table 35-2 */ |
| e->index == MSR_IA32_UCODE_REV) |
| return -EINVAL; |
| if (e->reserved != 0) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static int nested_vmx_load_msr_check(struct kvm_vcpu *vcpu, |
| struct vmx_msr_entry *e) |
| { |
| if (e->index == MSR_FS_BASE || |
| e->index == MSR_GS_BASE || |
| e->index == MSR_IA32_SMM_MONITOR_CTL || /* SMM is not supported */ |
| nested_vmx_msr_check_common(vcpu, e)) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static int nested_vmx_store_msr_check(struct kvm_vcpu *vcpu, |
| struct vmx_msr_entry *e) |
| { |
| if (e->index == MSR_IA32_SMBASE || /* SMM is not supported */ |
| nested_vmx_msr_check_common(vcpu, e)) |
| return -EINVAL; |
| return 0; |
| } |
| |
| /* |
| * Load guest's/host's msr at nested entry/exit. |
| * return 0 for success, entry index for failure. |
| */ |
| static u32 nested_vmx_load_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count) |
| { |
| u32 i; |
| struct vmx_msr_entry e; |
| struct msr_data msr; |
| |
| msr.host_initiated = false; |
| for (i = 0; i < count; i++) { |
| if (kvm_vcpu_read_guest(vcpu, gpa + i * sizeof(e), |
| &e, sizeof(e))) { |
| pr_debug_ratelimited( |
| "%s cannot read MSR entry (%u, 0x%08llx)\n", |
| __func__, i, gpa + i * sizeof(e)); |
| goto fail; |
| } |
| if (nested_vmx_load_msr_check(vcpu, &e)) { |
| pr_debug_ratelimited( |
| "%s check failed (%u, 0x%x, 0x%x)\n", |
| __func__, i, e.index, e.reserved); |
| goto fail; |
| } |
| msr.index = e.index; |
| msr.data = e.value; |
| if (kvm_set_msr(vcpu, &msr)) { |
| pr_debug_ratelimited( |
| "%s cannot write MSR (%u, 0x%x, 0x%llx)\n", |
| __func__, i, e.index, e.value); |
| goto fail; |
| } |
| } |
| return 0; |
| fail: |
| return i + 1; |
| } |
| |
| static int nested_vmx_store_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count) |
| { |
| u32 i; |
| struct vmx_msr_entry e; |
| |
| for (i = 0; i < count; i++) { |
| struct msr_data msr_info; |
| if (kvm_vcpu_read_guest(vcpu, |
| gpa + i * sizeof(e), |
| &e, 2 * sizeof(u32))) { |
| pr_debug_ratelimited( |
| "%s cannot read MSR entry (%u, 0x%08llx)\n", |
| __func__, i, gpa + i * sizeof(e)); |
| return -EINVAL; |
| } |
| if (nested_vmx_store_msr_check(vcpu, &e)) { |
| pr_debug_ratelimited( |
| "%s check failed (%u, 0x%x, 0x%x)\n", |
| __func__, i, e.index, e.reserved); |
| return -EINVAL; |
| } |
| msr_info.host_initiated = false; |
| msr_info.index = e.index; |
| if (kvm_get_msr(vcpu, &msr_info)) { |
| pr_debug_ratelimited( |
| "%s cannot read MSR (%u, 0x%x)\n", |
| __func__, i, e.index); |
| return -EINVAL; |
| } |
| if (kvm_vcpu_write_guest(vcpu, |
| gpa + i * sizeof(e) + |
| offsetof(struct vmx_msr_entry, value), |
| &msr_info.data, sizeof(msr_info.data))) { |
| pr_debug_ratelimited( |
| "%s cannot write MSR (%u, 0x%x, 0x%llx)\n", |
| __func__, i, e.index, msr_info.data); |
| return -EINVAL; |
| } |
| } |
| return 0; |
| } |
| |
| static bool nested_cr3_valid(struct kvm_vcpu *vcpu, unsigned long val) |
| { |
| unsigned long invalid_mask; |
| |
| invalid_mask = (~0ULL) << cpuid_maxphyaddr(vcpu); |
| return (val & invalid_mask) == 0; |
| } |
| |
| /* |
| * Load guest's/host's cr3 at nested entry/exit. nested_ept is true if we are |
| * emulating VM entry into a guest with EPT enabled. |
| * Returns 0 on success, 1 on failure. Invalid state exit qualification code |
| * is assigned to entry_failure_code on failure. |
| */ |
| static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, bool nested_ept, |
| u32 *entry_failure_code) |
| { |
| if (cr3 != kvm_read_cr3(vcpu) || (!nested_ept && pdptrs_changed(vcpu))) { |
| if (!nested_cr3_valid(vcpu, cr3)) { |
| *entry_failure_code = ENTRY_FAIL_DEFAULT; |
| return 1; |
| } |
| |
| /* |
| * If PAE paging and EPT are both on, CR3 is not used by the CPU and |
| * must not be dereferenced. |
| */ |
| if (!is_long_mode(vcpu) && is_pae(vcpu) && is_paging(vcpu) && |
| !nested_ept) { |
| if (!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) { |
| *entry_failure_code = ENTRY_FAIL_PDPTE; |
| return 1; |
| } |
| } |
| } |
| |
| if (!nested_ept) |
| kvm_mmu_new_cr3(vcpu, cr3, false); |
| |
| vcpu->arch.cr3 = cr3; |
| __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); |
| |
| kvm_init_mmu(vcpu, false); |
| |
| return 0; |
| } |
| |
| /* |
| * Returns if KVM is able to config CPU to tag TLB entries |
| * populated by L2 differently than TLB entries populated |
| * by L1. |
| * |
| * If L1 uses EPT, then TLB entries are tagged with different EPTP. |
| * |
| * If L1 uses VPID and we allocated a vpid02, TLB entries are tagged |
| * with different VPID (L1 entries are tagged with vmx->vpid |
| * while L2 entries are tagged with vmx->nested.vpid02). |
| */ |
| static bool nested_has_guest_tlb_tag(struct kvm_vcpu *vcpu) |
| { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| |
| return nested_cpu_has_ept(vmcs12) || |
| (nested_cpu_has_vpid(vmcs12) && to_vmx(vcpu)->nested.vpid02); |
| } |
| |
| static u64 nested_vmx_calc_efer(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12) |
| { |
| if (vmx->nested.nested_run_pending && |
| (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER)) |
| return vmcs12->guest_ia32_efer; |
| else if (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) |
| return vmx->vcpu.arch.efer | (EFER_LMA | EFER_LME); |
| else |
| return vmx->vcpu.arch.efer & ~(EFER_LMA | EFER_LME); |
| } |
| |
| static void prepare_vmcs02_constant_state(struct vcpu_vmx *vmx) |
| { |
| /* |
| * If vmcs02 hasn't been initialized, set the constant vmcs02 state |
| * according to L0's settings (vmcs12 is irrelevant here). Host |
| * fields that come from L0 and are not constant, e.g. HOST_CR3, |
| * will be set as needed prior to VMLAUNCH/VMRESUME. |
| */ |
| if (vmx->nested.vmcs02_initialized) |
| return; |
| vmx->nested.vmcs02_initialized = true; |
| |
| /* |
| * We don't care what the EPTP value is we just need to guarantee |
| * it's valid so we don't get a false positive when doing early |
| * consistency checks. |
| */ |
| if (enable_ept && nested_early_check) |
| vmcs_write64(EPT_POINTER, construct_eptp(&vmx->vcpu, 0)); |
| |
| /* All VMFUNCs are currently emulated through L0 vmexits. */ |
| if (cpu_has_vmx_vmfunc()) |
| vmcs_write64(VM_FUNCTION_CONTROL, 0); |
| |
| if (cpu_has_vmx_posted_intr()) |
| vmcs_write16(POSTED_INTR_NV, POSTED_INTR_NESTED_VECTOR); |
| |
| if (cpu_has_vmx_msr_bitmap()) |
| vmcs_write64(MSR_BITMAP, __pa(vmx->nested.vmcs02.msr_bitmap)); |
| |
| if (enable_pml) |
| vmcs_write64(PML_ADDRESS, page_to_phys(vmx->pml_pg)); |
| |
| /* |
| * Set the MSR load/store lists to match L0's settings. Only the |
| * addresses are constant (for vmcs02), the counts can change based |
| * on L2's behavior, e.g. switching to/from long mode. |
| */ |
| vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0); |
| vmcs_write64(VM_EXIT_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.host.val)); |
| vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.guest.val)); |
| |
| vmx_set_constant_host_state(vmx); |
| } |
| |
| static void prepare_vmcs02_early_full(struct vcpu_vmx *vmx, |
| struct vmcs12 *vmcs12) |
| { |
| prepare_vmcs02_constant_state(vmx); |
| |
| vmcs_write64(VMCS_LINK_POINTER, -1ull); |
| |
| if (enable_vpid) { |
| if (nested_cpu_has_vpid(vmcs12) && vmx->nested.vpid02) |
| vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->nested.vpid02); |
| else |
| vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid); |
| } |
| } |
| |
| static void prepare_vmcs02_early(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12) |
| { |
| u32 exec_control, vmcs12_exec_ctrl; |
| u64 guest_efer = nested_vmx_calc_efer(vmx, vmcs12); |
| |
| if (vmx->nested.dirty_vmcs12) |
| prepare_vmcs02_early_full(vmx, vmcs12); |
| |
| /* |
| * HOST_RSP is normally set correctly in vmx_vcpu_run() just before |
| * entry, but only if the current (host) sp changed from the value |
| * we wrote last (vmx->host_rsp). This cache is no longer relevant |
| * if we switch vmcs, and rather than hold a separate cache per vmcs, |
| * here we just force the write to happen on entry. host_rsp will |
| * also be written unconditionally by nested_vmx_check_vmentry_hw() |
| * if we are doing early consistency checks via hardware. |
| */ |
| vmx->host_rsp = 0; |
| |
| /* |
| * PIN CONTROLS |
| */ |
| exec_control = vmcs12->pin_based_vm_exec_control; |
| |
| /* Preemption timer setting is computed directly in vmx_vcpu_run. */ |
| exec_control |= vmcs_config.pin_based_exec_ctrl; |
| exec_control &= ~PIN_BASED_VMX_PREEMPTION_TIMER; |
| vmx->loaded_vmcs->hv_timer_armed = false; |
| |
| /* Posted interrupts setting is only taken from vmcs12. */ |
| if (nested_cpu_has_posted_intr(vmcs12)) { |
| vmx->nested.posted_intr_nv = vmcs12->posted_intr_nv; |
| vmx->nested.pi_pending = false; |
| } else { |
| exec_control &= ~PIN_BASED_POSTED_INTR; |
| } |
| vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, exec_control); |
| |
| /* |
| * EXEC CONTROLS |
| */ |
| exec_control = vmx_exec_control(vmx); /* L0's desires */ |
| exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING; |
| exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING; |
| exec_control &= ~CPU_BASED_TPR_SHADOW; |
| exec_control |= vmcs12->cpu_based_vm_exec_control; |
| |
| /* |
| * Write an illegal value to VIRTUAL_APIC_PAGE_ADDR. Later, if |
| * nested_get_vmcs12_pages can't fix it up, the illegal value |
| * will result in a VM entry failure. |
| */ |
| if (exec_control & CPU_BASED_TPR_SHADOW) { |
| vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, -1ull); |
| vmcs_write32(TPR_THRESHOLD, vmcs12->tpr_threshold); |
| } else { |
| #ifdef CONFIG_X86_64 |
| exec_control |= CPU_BASED_CR8_LOAD_EXITING | |
| CPU_BASED_CR8_STORE_EXITING; |
| #endif |
| } |
| |
| /* |
| * A vmexit (to either L1 hypervisor or L0 userspace) is always needed |
| * for I/O port accesses. |
| */ |
| exec_control &= ~CPU_BASED_USE_IO_BITMAPS; |
| exec_control |= CPU_BASED_UNCOND_IO_EXITING; |
| vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control); |
| |
| /* |
| * SECONDARY EXEC CONTROLS |
| */ |
| if (cpu_has_secondary_exec_ctrls()) { |
| exec_control = vmx->secondary_exec_control; |
| |
| /* Take the following fields only from vmcs12 */ |
| exec_control &= ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | |
| SECONDARY_EXEC_ENABLE_INVPCID | |
| SECONDARY_EXEC_RDTSCP | |
| SECONDARY_EXEC_XSAVES | |
| SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY | |
| SECONDARY_EXEC_APIC_REGISTER_VIRT | |
| SECONDARY_EXEC_ENABLE_VMFUNC); |
| if (nested_cpu_has(vmcs12, |
| CPU_BASED_ACTIVATE_SECONDARY_CONTROLS)) { |
| vmcs12_exec_ctrl = vmcs12->secondary_vm_exec_control & |
| ~SECONDARY_EXEC_ENABLE_PML; |
| exec_control |= vmcs12_exec_ctrl; |
| } |
| |
| /* VMCS shadowing for L2 is emulated for now */ |
| exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS; |
| |
| if (exec_control & SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY) |
| vmcs_write16(GUEST_INTR_STATUS, |
| vmcs12->guest_intr_status); |
| |
| /* |
| * Write an illegal value to APIC_ACCESS_ADDR. Later, |
| * nested_get_vmcs12_pages will either fix it up or |
| * remove the VM execution control. |
| */ |
| if (exec_control & SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) |
| vmcs_write64(APIC_ACCESS_ADDR, -1ull); |
| |
| if (exec_control & SECONDARY_EXEC_ENCLS_EXITING) |
| vmcs_write64(ENCLS_EXITING_BITMAP, -1ull); |
| |
| vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control); |
| } |
| |
| /* |
| * ENTRY CONTROLS |
| * |
| * vmcs12's VM_{ENTRY,EXIT}_LOAD_IA32_EFER and VM_ENTRY_IA32E_MODE |
| * are emulated by vmx_set_efer() in prepare_vmcs02(), but speculate |
| * on the related bits (if supported by the CPU) in the hope that |
| * we can avoid VMWrites during vmx_set_efer(). |
| */ |
| exec_control = (vmcs12->vm_entry_controls | vmcs_config.vmentry_ctrl) & |
| ~VM_ENTRY_IA32E_MODE & ~VM_ENTRY_LOAD_IA32_EFER; |
| if (cpu_has_load_ia32_efer) { |
| if (guest_efer & EFER_LMA) |
| exec_control |= VM_ENTRY_IA32E_MODE; |
| if (guest_efer != host_efer) |
| exec_control |= VM_ENTRY_LOAD_IA32_EFER; |
| } |
| vm_entry_controls_init(vmx, exec_control); |
| |
| /* |
| * EXIT CONTROLS |
| * |
| * L2->L1 exit controls are emulated - the hardware exit is to L0 so |
| * we should use its exit controls. Note that VM_EXIT_LOAD_IA32_EFER |
| * bits may be modified by vmx_set_efer() in prepare_vmcs02(). |
| */ |
| exec_control = vmcs_config.vmexit_ctrl; |
| if (cpu_has_load_ia32_efer && guest_efer != host_efer) |
| exec_control |= VM_EXIT_LOAD_IA32_EFER; |
| vm_exit_controls_init(vmx, exec_control); |
| |
| /* |
| * Conceptually we want to copy the PML address and index from |
| * vmcs01 here, and then back to vmcs01 on nested vmexit. But, |
| * since we always flush the log on each vmexit and never change |
| * the PML address (once set), this happens to be equivalent to |
| * simply resetting the index in vmcs02. |
| */ |
| if (enable_pml) |
| vmcs_write16(GUEST_PML_INDEX, PML_ENTITY_NUM - 1); |
| |
| /* |
| * Interrupt/Exception Fields |
| */ |
| if (vmx->nested.nested_run_pending) { |
| vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, |
| vmcs12->vm_entry_intr_info_field); |
| vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, |
| vmcs12->vm_entry_exception_error_code); |
| vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, |
| vmcs12->vm_entry_instruction_len); |
| vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, |
| vmcs12->guest_interruptibility_info); |
| vmx->loaded_vmcs->nmi_known_unmasked = |
| !(vmcs12->guest_interruptibility_info & GUEST_INTR_STATE_NMI); |
| } else { |
| vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); |
| } |
| } |
| |
| static void prepare_vmcs02_full(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12) |
| { |
| vmcs_write16(GUEST_ES_SELECTOR, vmcs12->guest_es_selector); |
| vmcs_write16(GUEST_SS_SELECTOR, vmcs12->guest_ss_selector); |
| vmcs_write16(GUEST_DS_SELECTOR, vmcs12->guest_ds_selector); |
| vmcs_write16(GUEST_FS_SELECTOR, vmcs12->guest_fs_selector); |
| vmcs_write16(GUEST_GS_SELECTOR, vmcs12->guest_gs_selector); |
| vmcs_write16(GUEST_LDTR_SELECTOR, vmcs12->guest_ldtr_selector); |
| vmcs_write16(GUEST_TR_SELECTOR, vmcs12->guest_tr_selector); |
| vmcs_write32(GUEST_ES_LIMIT, vmcs12->guest_es_limit); |
| vmcs_write32(GUEST_SS_LIMIT, vmcs12->guest_ss_limit); |
| vmcs_write32(GUEST_DS_LIMIT, vmcs12->guest_ds_limit); |
| vmcs_write32(GUEST_FS_LIMIT, vmcs12->guest_fs_limit); |
| vmcs_write32(GUEST_GS_LIMIT, vmcs12->guest_gs_limit); |
| vmcs_write32(GUEST_LDTR_LIMIT, vmcs12->guest_ldtr_limit); |
| vmcs_write32(GUEST_TR_LIMIT, vmcs12->guest_tr_limit); |
| vmcs_write32(GUEST_GDTR_LIMIT, vmcs12->guest_gdtr_limit); |
| vmcs_write32(GUEST_IDTR_LIMIT, vmcs12->guest_idtr_limit); |
| vmcs_write32(GUEST_ES_AR_BYTES, vmcs12->guest_es_ar_bytes); |
| vmcs_write32(GUEST_SS_AR_BYTES, vmcs12->guest_ss_ar_bytes); |
| vmcs_write32(GUEST_DS_AR_BYTES, vmcs12->guest_ds_ar_bytes); |
| vmcs_write32(GUEST_FS_AR_BYTES, vmcs12->guest_fs_ar_bytes); |
| vmcs_write32(GUEST_GS_AR_BYTES, vmcs12->guest_gs_ar_bytes); |
| vmcs_write32(GUEST_LDTR_AR_BYTES, vmcs12->guest_ldtr_ar_bytes); |
| vmcs_write32(GUEST_TR_AR_BYTES, vmcs12->guest_tr_ar_bytes); |
| vmcs_writel(GUEST_SS_BASE, vmcs12->guest_ss_base); |
| vmcs_writel(GUEST_DS_BASE, vmcs12->guest_ds_base); |
| vmcs_writel(GUEST_FS_BASE, vmcs12->guest_fs_base); |
| vmcs_writel(GUEST_GS_BASE, vmcs12->guest_gs_base); |
| vmcs_writel(GUEST_LDTR_BASE, vmcs12->guest_ldtr_base); |
| vmcs_writel(GUEST_TR_BASE, vmcs12->guest_tr_base); |
| vmcs_writel(GUEST_GDTR_BASE, vmcs12->guest_gdtr_base); |
| vmcs_writel(GUEST_IDTR_BASE, vmcs12->guest_idtr_base); |
| |
| vmcs_write32(GUEST_SYSENTER_CS, vmcs12->guest_sysenter_cs); |
| vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS, |
| vmcs12->guest_pending_dbg_exceptions); |
| vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->guest_sysenter_esp); |
| vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->guest_sysenter_eip); |
| |
| if (nested_cpu_has_xsaves(vmcs12)) |
| vmcs_write64(XSS_EXIT_BITMAP, vmcs12->xss_exit_bitmap); |
| |
| /* |
| * Whether page-faults are trapped is determined by a combination of |
| * 3 settings: PFEC_MASK, PFEC_MATCH and EXCEPTION_BITMAP.PF. |
| * If enable_ept, L0 doesn't care about page faults and we should |
| * set all of these to L1's desires. However, if !enable_ept, L0 does |
| * care about (at least some) page faults, and because it is not easy |
| * (if at all possible?) to merge L0 and L1's desires, we simply ask |
| * to exit on each and every L2 page fault. This is done by setting |
| * MASK=MATCH=0 and (see below) EB.PF=1. |
| * Note that below we don't need special code to set EB.PF beyond the |
| * "or"ing of the EB of vmcs01 and vmcs12, because when enable_ept, |
| * vmcs01's EB.PF is 0 so the "or" will take vmcs12's value, and when |
| * !enable_ept, EB.PF is 1, so the "or" will always be 1. |
| */ |
| vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, |
| enable_ept ? vmcs12->page_fault_error_code_mask : 0); |
| vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, |
| enable_ept ? vmcs12->page_fault_error_code_match : 0); |
| |
| if (cpu_has_vmx_apicv()) { |
| vmcs_write64(EOI_EXIT_BITMAP0, vmcs12->eoi_exit_bitmap0); |
| vmcs_write64(EOI_EXIT_BITMAP1, vmcs12->eoi_exit_bitmap1); |
| vmcs_write64(EOI_EXIT_BITMAP2, vmcs12->eoi_exit_bitmap2); |
| vmcs_write64(EOI_EXIT_BITMAP3, vmcs12->eoi_exit_bitmap3); |
| } |
| |
| vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, vmx->msr_autoload.host.nr); |
| vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_autoload.guest.nr); |
| |
| set_cr4_guest_host_mask(vmx); |
| |
| if (kvm_mpx_supported()) { |
| if (vmx->nested.nested_run_pending && |
| (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS)) |
| vmcs_write64(GUEST_BNDCFGS, vmcs12->guest_bndcfgs); |
| else |
| vmcs_write64(GUEST_BNDCFGS, vmx->nested.vmcs01_guest_bndcfgs); |
| } |
| |
| /* |
| * L1 may access the L2's PDPTR, so save them to construct vmcs12 |
| */ |
| if (enable_ept) { |
| vmcs_write64(GUEST_PDPTR0, vmcs12->guest_pdptr0); |
| vmcs_write64(GUEST_PDPTR1, vmcs12->guest_pdptr1); |
| vmcs_write64(GUEST_PDPTR2, vmcs12->guest_pdptr2); |
| vmcs_write64(GUEST_PDPTR3, vmcs12->guest_pdptr3); |
| } |
| } |
| |
| /* |
| * prepare_vmcs02 is called when the L1 guest hypervisor runs its nested |
| * L2 guest. L1 has a vmcs for L2 (vmcs12), and this function "merges" it |
| * with L0's requirements for its guest (a.k.a. vmcs01), so we can run the L2 |
| * guest in a way that will both be appropriate to L1's requests, and our |
| * needs. In addition to modifying the active vmcs (which is vmcs02), this |
| * function also has additional necessary side-effects, like setting various |
| * vcpu->arch fields. |
| * Returns 0 on success, 1 on failure. Invalid state exit qualification code |
| * is assigned to entry_failure_code on failure. |
| */ |
| static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, |
| u32 *entry_failure_code) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| if (vmx->nested.dirty_vmcs12) { |
| prepare_vmcs02_full(vmx, vmcs12); |
| vmx->nested.dirty_vmcs12 = false; |
| } |
| |
| /* |
| * First, the fields that are shadowed. This must be kept in sync |
| * with vmx_shadow_fields.h. |
| */ |
| |
| vmcs_write16(GUEST_CS_SELECTOR, vmcs12->guest_cs_selector); |
| vmcs_write32(GUEST_CS_LIMIT, vmcs12->guest_cs_limit); |
| vmcs_write32(GUEST_CS_AR_BYTES, vmcs12->guest_cs_ar_bytes); |
| vmcs_writel(GUEST_ES_BASE, vmcs12->guest_es_base); |
| vmcs_writel(GUEST_CS_BASE, vmcs12->guest_cs_base); |
| |
| if (vmx->nested.nested_run_pending && |
| (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS)) { |
| kvm_set_dr(vcpu, 7, vmcs12->guest_dr7); |
| vmcs_write64(GUEST_IA32_DEBUGCTL, vmcs12->guest_ia32_debugctl); |
| } else { |
| kvm_set_dr(vcpu, 7, vcpu->arch.dr7); |
| vmcs_write64(GUEST_IA32_DEBUGCTL, vmx->nested.vmcs01_debugctl); |
| } |
| vmx_set_rflags(vcpu, vmcs12->guest_rflags); |
| |
| vmx->nested.preemption_timer_expired = false; |
| if (nested_cpu_has_preemption_timer(vmcs12)) |
| vmx_start_preemption_timer(vcpu); |
| |
| /* EXCEPTION_BITMAP and CR0_GUEST_HOST_MASK should basically be the |
| * bitwise-or of what L1 wants to trap for L2, and what we want to |
| * trap. Note that CR0.TS also needs updating - we do this later. |
| */ |
| update_exception_bitmap(vcpu); |
| vcpu->arch.cr0_guest_owned_bits &= ~vmcs12->cr0_guest_host_mask; |
| vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits); |
| |
| if (vmx->nested.nested_run_pending && |
| (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT)) { |
| vmcs_write64(GUEST_IA32_PAT, vmcs12->guest_ia32_pat); |
| vcpu->arch.pat = vmcs12->guest_ia32_pat; |
| } else if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) { |
| vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat); |
| } |
| |
| vmcs_write64(TSC_OFFSET, vcpu->arch.tsc_offset); |
| |
| if (kvm_has_tsc_control) |
| decache_tsc_multiplier(vmx); |
| |
| if (enable_vpid) { |
| /* |
| * There is no direct mapping between vpid02 and vpid12, the |
| * vpid02 is per-vCPU for L0 and reused while the value of |
| * vpid12 is changed w/ one invvpid during nested vmentry. |
| * The vpid12 is allocated by L1 for L2, so it will not |
| * influence global bitmap(for vpid01 and vpid02 allocation) |
| * even if spawn a lot of nested vCPUs. |
| */ |
| if (nested_cpu_has_vpid(vmcs12) && nested_has_guest_tlb_tag(vcpu)) { |
| if (vmcs12->virtual_processor_id != vmx->nested.last_vpid) { |
| vmx->nested.last_vpid = vmcs12->virtual_processor_id; |
| __vmx_flush_tlb(vcpu, nested_get_vpid02(vcpu), false); |
| } |
| } else { |
| /* |
| * If L1 use EPT, then L0 needs to execute INVEPT on |
| * EPTP02 instead of EPTP01. Therefore, delay TLB |
| * flush until vmcs02->eptp is fully updated by |
| * KVM_REQ_LOAD_CR3. Note that this assumes |
| * KVM_REQ_TLB_FLUSH is evaluated after |
| * KVM_REQ_LOAD_CR3 in vcpu_enter_guest(). |
| */ |
| kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
| } |
| } |
| |
| if (nested_cpu_has_ept(vmcs12)) |
| nested_ept_init_mmu_context(vcpu); |
| else if (nested_cpu_has2(vmcs12, |
| SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) |
| vmx_flush_tlb(vcpu, true); |
| |
| /* |
| * This sets GUEST_CR0 to vmcs12->guest_cr0, possibly modifying those |
| * bits which we consider mandatory enabled. |
| * The CR0_READ_SHADOW is what L2 should have expected to read given |
| * the specifications by L1; It's not enough to take |
| * vmcs12->cr0_read_shadow because on our cr0_guest_host_mask we we |
| * have more bits than L1 expected. |
| */ |
| vmx_set_cr0(vcpu, vmcs12->guest_cr0); |
| vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12)); |
| |
| vmx_set_cr4(vcpu, vmcs12->guest_cr4); |
| vmcs_writel(CR4_READ_SHADOW, nested_read_cr4(vmcs12)); |
| |
| vcpu->arch.efer = nested_vmx_calc_efer(vmx, vmcs12); |
| /* Note: may modify VM_ENTRY/EXIT_CONTROLS and GUEST/HOST_IA32_EFER */ |
| vmx_set_efer(vcpu, vcpu->arch.efer); |
| |
| /* |
| * Guest state is invalid and unrestricted guest is disabled, |
| * which means L1 attempted VMEntry to L2 with invalid state. |
| * Fail the VMEntry. |
| */ |
| if (vmx->emulation_required) { |
| *entry_failure_code = ENTRY_FAIL_DEFAULT; |
| return 1; |
| } |
| |
| /* Shadow page tables on either EPT or shadow page tables. */ |
| if (nested_vmx_load_cr3(vcpu, vmcs12->guest_cr3, nested_cpu_has_ept(vmcs12), |
| entry_failure_code)) |
| return 1; |
| |
| if (!enable_ept) |
| vcpu->arch.walk_mmu->inject_page_fault = vmx_inject_page_fault_nested; |
| |
| kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->guest_rsp); |
| kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->guest_rip); |
| return 0; |
| } |
| |
| static int nested_vmx_check_nmi_controls(struct vmcs12 *vmcs12) |
| { |
| if (!nested_cpu_has_nmi_exiting(vmcs12) && |
| nested_cpu_has_virtual_nmis(vmcs12)) |
| return -EINVAL; |
| |
| if (!nested_cpu_has_virtual_nmis(vmcs12) && |
| nested_cpu_has(vmcs12, CPU_BASED_VIRTUAL_NMI_PENDING)) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int check_vmentry_prereqs(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| bool ia32e; |
| |
| if (vmcs12->guest_activity_state != GUEST_ACTIVITY_ACTIVE && |
| vmcs12->guest_activity_state != GUEST_ACTIVITY_HLT) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (nested_cpu_has_vpid(vmcs12) && !vmcs12->virtual_processor_id) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (nested_vmx_check_io_bitmap_controls(vcpu, vmcs12)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (nested_vmx_check_msr_bitmap_controls(vcpu, vmcs12)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (nested_vmx_check_apic_access_controls(vcpu, vmcs12)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (nested_vmx_check_tpr_shadow_controls(vcpu, vmcs12)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (nested_vmx_check_apicv_controls(vcpu, vmcs12)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (nested_vmx_check_msr_switch_controls(vcpu, vmcs12)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (nested_vmx_check_pml_controls(vcpu, vmcs12)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (nested_vmx_check_shadow_vmcs_controls(vcpu, vmcs12)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (!vmx_control_verify(vmcs12->cpu_based_vm_exec_control, |
| vmx->nested.msrs.procbased_ctls_low, |
| vmx->nested.msrs.procbased_ctls_high) || |
| (nested_cpu_has(vmcs12, CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) && |
| !vmx_control_verify(vmcs12->secondary_vm_exec_control, |
| vmx->nested.msrs.secondary_ctls_low, |
| vmx->nested.msrs.secondary_ctls_high)) || |
| !vmx_control_verify(vmcs12->pin_based_vm_exec_control, |
| vmx->nested.msrs.pinbased_ctls_low, |
| vmx->nested.msrs.pinbased_ctls_high) || |
| !vmx_control_verify(vmcs12->vm_exit_controls, |
| vmx->nested.msrs.exit_ctls_low, |
| vmx->nested.msrs.exit_ctls_high) || |
| !vmx_control_verify(vmcs12->vm_entry_controls, |
| vmx->nested.msrs.entry_ctls_low, |
| vmx->nested.msrs.entry_ctls_high)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (nested_vmx_check_nmi_controls(vmcs12)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (nested_cpu_has_vmfunc(vmcs12)) { |
| if (vmcs12->vm_function_control & |
| ~vmx->nested.msrs.vmfunc_controls) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (nested_cpu_has_eptp_switching(vmcs12)) { |
| if (!nested_cpu_has_ept(vmcs12) || |
| !page_address_valid(vcpu, vmcs12->eptp_list_address)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| } |
| } |
| |
| if (vmcs12->cr3_target_count > nested_cpu_vmx_misc_cr3_count(vcpu)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| if (!nested_host_cr0_valid(vcpu, vmcs12->host_cr0) || |
| !nested_host_cr4_valid(vcpu, vmcs12->host_cr4) || |
| !nested_cr3_valid(vcpu, vmcs12->host_cr3)) |
| return VMXERR_ENTRY_INVALID_HOST_STATE_FIELD; |
| |
| /* |
| * If the load IA32_EFER VM-exit control is 1, bits reserved in the |
| * IA32_EFER MSR must be 0 in the field for that register. In addition, |
| * the values of the LMA and LME bits in the field must each be that of |
| * the host address-space size VM-exit control. |
| */ |
| if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER) { |
| ia32e = (vmcs12->vm_exit_controls & |
| VM_EXIT_HOST_ADDR_SPACE_SIZE) != 0; |
| if (!kvm_valid_efer(vcpu, vmcs12->host_ia32_efer) || |
| ia32e != !!(vmcs12->host_ia32_efer & EFER_LMA) || |
| ia32e != !!(vmcs12->host_ia32_efer & EFER_LME)) |
| return VMXERR_ENTRY_INVALID_HOST_STATE_FIELD; |
| } |
| |
| /* |
| * From the Intel SDM, volume 3: |
| * Fields relevant to VM-entry event injection must be set properly. |
| * These fields are the VM-entry interruption-information field, the |
| * VM-entry exception error code, and the VM-entry instruction length. |
| */ |
| if (vmcs12->vm_entry_intr_info_field & INTR_INFO_VALID_MASK) { |
| u32 intr_info = vmcs12->vm_entry_intr_info_field; |
| u8 vector = intr_info & INTR_INFO_VECTOR_MASK; |
| u32 intr_type = intr_info & INTR_INFO_INTR_TYPE_MASK; |
| bool has_error_code = intr_info & INTR_INFO_DELIVER_CODE_MASK; |
| bool should_have_error_code; |
| bool urg = nested_cpu_has2(vmcs12, |
| SECONDARY_EXEC_UNRESTRICTED_GUEST); |
| bool prot_mode = !urg || vmcs12->guest_cr0 & X86_CR0_PE; |
| |
| /* VM-entry interruption-info field: interruption type */ |
| if (intr_type == INTR_TYPE_RESERVED || |
| (intr_type == INTR_TYPE_OTHER_EVENT && |
| !nested_cpu_supports_monitor_trap_flag(vcpu))) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| /* VM-entry interruption-info field: vector */ |
| if ((intr_type == INTR_TYPE_NMI_INTR && vector != NMI_VECTOR) || |
| (intr_type == INTR_TYPE_HARD_EXCEPTION && vector > 31) || |
| (intr_type == INTR_TYPE_OTHER_EVENT && vector != 0)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| /* VM-entry interruption-info field: deliver error code */ |
| should_have_error_code = |
| intr_type == INTR_TYPE_HARD_EXCEPTION && prot_mode && |
| x86_exception_has_error_code(vector); |
| if (has_error_code != should_have_error_code) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| /* VM-entry exception error code */ |
| if (has_error_code && |
| vmcs12->vm_entry_exception_error_code & GENMASK(31, 15)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| /* VM-entry interruption-info field: reserved bits */ |
| if (intr_info & INTR_INFO_RESVD_BITS_MASK) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| /* VM-entry instruction length */ |
| switch (intr_type) { |
| case INTR_TYPE_SOFT_EXCEPTION: |
| case INTR_TYPE_SOFT_INTR: |
| case INTR_TYPE_PRIV_SW_EXCEPTION: |
| if ((vmcs12->vm_entry_instruction_len > 15) || |
| (vmcs12->vm_entry_instruction_len == 0 && |
| !nested_cpu_has_zero_length_injection(vcpu))) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| } |
| } |
| |
| if (nested_cpu_has_ept(vmcs12) && |
| !valid_ept_address(vcpu, vmcs12->ept_pointer)) |
| return VMXERR_ENTRY_INVALID_CONTROL_FIELD; |
| |
| return 0; |
| } |
| |
| static int nested_vmx_check_vmcs_link_ptr(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| int r; |
| struct page *page; |
| struct vmcs12 *shadow; |
| |
| if (vmcs12->vmcs_link_pointer == -1ull) |
| return 0; |
| |
| if (!page_address_valid(vcpu, vmcs12->vmcs_link_pointer)) |
| return -EINVAL; |
| |
| page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->vmcs_link_pointer); |
| if (is_error_page(page)) |
| return -EINVAL; |
| |
| r = 0; |
| shadow = kmap(page); |
| if (shadow->hdr.revision_id != VMCS12_REVISION || |
| shadow->hdr.shadow_vmcs != nested_cpu_has_shadow_vmcs(vmcs12)) |
| r = -EINVAL; |
| kunmap(page); |
| kvm_release_page_clean(page); |
| return r; |
| } |
| |
| static int check_vmentry_postreqs(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, |
| u32 *exit_qual) |
| { |
| bool ia32e; |
| |
| *exit_qual = ENTRY_FAIL_DEFAULT; |
| |
| if (!nested_guest_cr0_valid(vcpu, vmcs12->guest_cr0) || |
| !nested_guest_cr4_valid(vcpu, vmcs12->guest_cr4)) |
| return 1; |
| |
| if (nested_vmx_check_vmcs_link_ptr(vcpu, vmcs12)) { |
| *exit_qual = ENTRY_FAIL_VMCS_LINK_PTR; |
| return 1; |
| } |
| |
| /* |
| * If the load IA32_EFER VM-entry control is 1, the following checks |
| * are performed on the field for the IA32_EFER MSR: |
| * - Bits reserved in the IA32_EFER MSR must be 0. |
| * - Bit 10 (corresponding to IA32_EFER.LMA) must equal the value of |
| * the IA-32e mode guest VM-exit control. It must also be identical |
| * to bit 8 (LME) if bit 31 in the CR0 field (corresponding to |
| * CR0.PG) is 1. |
| */ |
| if (to_vmx(vcpu)->nested.nested_run_pending && |
| (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER)) { |
| ia32e = (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) != 0; |
| if (!kvm_valid_efer(vcpu, vmcs12->guest_ia32_efer) || |
| ia32e != !!(vmcs12->guest_ia32_efer & EFER_LMA) || |
| ((vmcs12->guest_cr0 & X86_CR0_PG) && |
| ia32e != !!(vmcs12->guest_ia32_efer & EFER_LME))) |
| return 1; |
| } |
| |
| if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS) && |
| (is_noncanonical_address(vmcs12->guest_bndcfgs & PAGE_MASK, vcpu) || |
| (vmcs12->guest_bndcfgs & MSR_IA32_BNDCFGS_RSVD))) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int __noclone nested_vmx_check_vmentry_hw(struct kvm_vcpu *vcpu) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| unsigned long cr3, cr4; |
| |
| if (!nested_early_check) |
| return 0; |
| |
| if (vmx->msr_autoload.host.nr) |
| vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0); |
| if (vmx->msr_autoload.guest.nr) |
| vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0); |
| |
| preempt_disable(); |
| |
| vmx_prepare_switch_to_guest(vcpu); |
| |
| /* |
| * Induce a consistency check VMExit by clearing bit 1 in GUEST_RFLAGS, |
| * which is reserved to '1' by hardware. GUEST_RFLAGS is guaranteed to |
| * be written (by preparve_vmcs02()) before the "real" VMEnter, i.e. |
| * there is no need to preserve other bits or save/restore the field. |
| */ |
| vmcs_writel(GUEST_RFLAGS, 0); |
| |
| vmcs_writel(HOST_RIP, vmx_early_consistency_check_return); |
| |
| cr3 = __get_current_cr3_fast(); |
| if (unlikely(cr3 != vmx->loaded_vmcs->host_state.cr3)) { |
| vmcs_writel(HOST_CR3, cr3); |
| vmx->loaded_vmcs->host_state.cr3 = cr3; |
| } |
| |
| cr4 = cr4_read_shadow(); |
| if (unlikely(cr4 != vmx->loaded_vmcs->host_state.cr4)) { |
| vmcs_writel(HOST_CR4, cr4); |
| vmx->loaded_vmcs->host_state.cr4 = cr4; |
| } |
| |
| vmx->__launched = vmx->loaded_vmcs->launched; |
| |
| asm( |
| /* Set HOST_RSP */ |
| __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t" |
| "mov %%" _ASM_SP ", %c[host_rsp](%0)\n\t" |
| |
| /* Check if vmlaunch of vmresume is needed */ |
| "cmpl $0, %c[launched](%0)\n\t" |
| "je 1f\n\t" |
| __ex(ASM_VMX_VMRESUME) "\n\t" |
| "jmp 2f\n\t" |
| "1: " __ex(ASM_VMX_VMLAUNCH) "\n\t" |
| "jmp 2f\n\t" |
| "2: " |
| |
| /* Set vmx->fail accordingly */ |
| "setbe %c[fail](%0)\n\t" |
| |
| ".pushsection .rodata\n\t" |
| ".global vmx_early_consistency_check_return\n\t" |
| "vmx_early_consistency_check_return: " _ASM_PTR " 2b\n\t" |
| ".popsection" |
| : |
| : "c"(vmx), "d"((unsigned long)HOST_RSP), |
| [launched]"i"(offsetof(struct vcpu_vmx, __launched)), |
| [fail]"i"(offsetof(struct vcpu_vmx, fail)), |
| [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)) |
| : "rax", "cc", "memory" |
| ); |
| |
| vmcs_writel(HOST_RIP, vmx_return); |
| |
| preempt_enable(); |
| |
| if (vmx->msr_autoload.host.nr) |
| vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, vmx->msr_autoload.host.nr); |
| if (vmx->msr_autoload.guest.nr) |
| vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_autoload.guest.nr); |
| |
| if (vmx->fail) { |
| WARN_ON_ONCE(vmcs_read32(VM_INSTRUCTION_ERROR) != |
| VMXERR_ENTRY_INVALID_CONTROL_FIELD); |
| vmx->fail = 0; |
| return 1; |
| } |
| |
| /* |
| * VMExit clears RFLAGS.IF and DR7, even on a consistency check. |
| */ |
| local_irq_enable(); |
| if (hw_breakpoint_active()) |
| set_debugreg(__this_cpu_read(cpu_dr7), 7); |
| |
| /* |
| * A non-failing VMEntry means we somehow entered guest mode with |
| * an illegal RIP, and that's just the tip of the iceberg. There |
| * is no telling what memory has been modified or what state has |
| * been exposed to unknown code. Hitting this all but guarantees |
| * a (very critical) hardware issue. |
| */ |
| WARN_ON(!(vmcs_read32(VM_EXIT_REASON) & |
| VMX_EXIT_REASONS_FAILED_VMENTRY)); |
| |
| return 0; |
| } |
| STACK_FRAME_NON_STANDARD(nested_vmx_check_vmentry_hw); |
| |
| static void load_vmcs12_host_state(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12); |
| |
| /* |
| * If from_vmentry is false, this is being called from state restore (either RSM |
| * or KVM_SET_NESTED_STATE). Otherwise it's called from vmlaunch/vmresume. |
| + * |
| + * Returns: |
| + * 0 - success, i.e. proceed with actual VMEnter |
| + * 1 - consistency check VMExit |
| + * -1 - consistency check VMFail |
| */ |
| static int nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, |
| bool from_vmentry) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| bool evaluate_pending_interrupts; |
| u32 exit_reason = EXIT_REASON_INVALID_STATE; |
| u32 exit_qual; |
| |
| evaluate_pending_interrupts = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) & |
| (CPU_BASED_VIRTUAL_INTR_PENDING | CPU_BASED_VIRTUAL_NMI_PENDING); |
| if (likely(!evaluate_pending_interrupts) && kvm_vcpu_apicv_active(vcpu)) |
| evaluate_pending_interrupts |= vmx_has_apicv_interrupt(vcpu); |
| |
| if (!(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS)) |
| vmx->nested.vmcs01_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL); |
| if (kvm_mpx_supported() && |
| !(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS)) |
| vmx->nested.vmcs01_guest_bndcfgs = vmcs_read64(GUEST_BNDCFGS); |
| |
| vmx_switch_vmcs(vcpu, &vmx->nested.vmcs02); |
| |
| prepare_vmcs02_early(vmx, vmcs12); |
| |
| if (from_vmentry) { |
| nested_get_vmcs12_pages(vcpu); |
| |
| if (nested_vmx_check_vmentry_hw(vcpu)) { |
| vmx_switch_vmcs(vcpu, &vmx->vmcs01); |
| return -1; |
| } |
| |
| if (check_vmentry_postreqs(vcpu, vmcs12, &exit_qual)) |
| goto vmentry_fail_vmexit; |
| } |
| |
| enter_guest_mode(vcpu); |
| if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING) |
| vcpu->arch.tsc_offset += vmcs12->tsc_offset; |
| |
| if (prepare_vmcs02(vcpu, vmcs12, &exit_qual)) |
| goto vmentry_fail_vmexit_guest_mode; |
| |
| if (from_vmentry) { |
| exit_reason = EXIT_REASON_MSR_LOAD_FAIL; |
| exit_qual = nested_vmx_load_msr(vcpu, |
| vmcs12->vm_entry_msr_load_addr, |
| vmcs12->vm_entry_msr_load_count); |
| if (exit_qual) |
| goto vmentry_fail_vmexit_guest_mode; |
| } else { |
| /* |
| * The MMU is not initialized to point at the right entities yet and |
| * "get pages" would need to read data from the guest (i.e. we will |
| * need to perform gpa to hpa translation). Request a call |
| * to nested_get_vmcs12_pages before the next VM-entry. The MSRs |
| * have already been set at vmentry time and should not be reset. |
| */ |
| kvm_make_request(KVM_REQ_GET_VMCS12_PAGES, vcpu); |
| } |
| |
| /* |
| * If L1 had a pending IRQ/NMI until it executed |
| * VMLAUNCH/VMRESUME which wasn't delivered because it was |
| * disallowed (e.g. interrupts disabled), L0 needs to |
| * evaluate if this pending event should cause an exit from L2 |
| * to L1 or delivered directly to L2 (e.g. In case L1 don't |
| * intercept EXTERNAL_INTERRUPT). |
| * |
| * Usually this would be handled by the processor noticing an |
| * IRQ/NMI window request, or checking RVI during evaluation of |
| * pending virtual interrupts. However, this setting was done |
| * on VMCS01 and now VMCS02 is active instead. Thus, we force L0 |
| * to perform pending event evaluation by requesting a KVM_REQ_EVENT. |
| */ |
| if (unlikely(evaluate_pending_interrupts)) |
| kvm_make_request(KVM_REQ_EVENT, vcpu); |
| |
| /* |
| * Note no nested_vmx_succeed or nested_vmx_fail here. At this point |
| * we are no longer running L1, and VMLAUNCH/VMRESUME has not yet |
| * returned as far as L1 is concerned. It will only return (and set |
| * the success flag) when L2 exits (see nested_vmx_vmexit()). |
| */ |
| return 0; |
| |
| /* |
| * A failed consistency check that leads to a VMExit during L1's |
| * VMEnter to L2 is a variation of a normal VMexit, as explained in |
| * 26.7 "VM-entry failures during or after loading guest state". |
| */ |
| vmentry_fail_vmexit_guest_mode: |
| if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING) |
| vcpu->arch.tsc_offset -= vmcs12->tsc_offset; |
| leave_guest_mode(vcpu); |
| |
| vmentry_fail_vmexit: |
| vmx_switch_vmcs(vcpu, &vmx->vmcs01); |
| |
| if (!from_vmentry) |
| return 1; |
| |
| load_vmcs12_host_state(vcpu, vmcs12); |
| vmcs12->vm_exit_reason = exit_reason | VMX_EXIT_REASONS_FAILED_VMENTRY; |
| vmcs12->exit_qualification = exit_qual; |
| if (enable_shadow_vmcs) |
| vmx->nested.sync_shadow_vmcs = true; |
| return 1; |
| } |
| |
| /* |
| * nested_vmx_run() handles a nested entry, i.e., a VMLAUNCH or VMRESUME on L1 |
| * for running an L2 nested guest. |
| */ |
| static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) |
| { |
| struct vmcs12 *vmcs12; |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| u32 interrupt_shadow = vmx_get_interrupt_shadow(vcpu); |
| int ret; |
| |
| if (!nested_vmx_check_permission(vcpu)) |
| return 1; |
| |
| if (vmx->nested.current_vmptr == -1ull) |
| return nested_vmx_failInvalid(vcpu); |
| |
| vmcs12 = get_vmcs12(vcpu); |
| |
| /* |
| * Can't VMLAUNCH or VMRESUME a shadow VMCS. Despite the fact |
| * that there *is* a valid VMCS pointer, RFLAGS.CF is set |
| * rather than RFLAGS.ZF, and no error number is stored to the |
| * VM-instruction error field. |
| */ |
| if (vmcs12->hdr.shadow_vmcs) |
| return nested_vmx_failInvalid(vcpu); |
| |
| if (enable_shadow_vmcs) |
| copy_shadow_to_vmcs12(vmx); |
| |
| /* |
| * The nested entry process starts with enforcing various prerequisites |
| * on vmcs12 as required by the Intel SDM, and act appropriately when |
| * they fail: As the SDM explains, some conditions should cause the |
| * instruction to fail, while others will cause the instruction to seem |
| * to succeed, but return an EXIT_REASON_INVALID_STATE. |
| * To speed up the normal (success) code path, we should avoid checking |
| * for misconfigurations which will anyway be caught by the processor |
| * when using the merged vmcs02. |
| */ |
| if (interrupt_shadow & KVM_X86_SHADOW_INT_MOV_SS) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_ENTRY_EVENTS_BLOCKED_BY_MOV_SS); |
| |
| if (vmcs12->launch_state == launch) |
| return nested_vmx_failValid(vcpu, |
| launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS |
| : VMXERR_VMRESUME_NONLAUNCHED_VMCS); |
| |
| ret = check_vmentry_prereqs(vcpu, vmcs12); |
| if (ret) |
| return nested_vmx_failValid(vcpu, ret); |
| |
| /* |
| * We're finally done with prerequisite checking, and can start with |
| * the nested entry. |
| */ |
| vmx->nested.nested_run_pending = 1; |
| ret = nested_vmx_enter_non_root_mode(vcpu, true); |
| vmx->nested.nested_run_pending = !ret; |
| if (ret > 0) |
| return 1; |
| else if (ret) |
| return nested_vmx_failValid(vcpu, |
| VMXERR_ENTRY_INVALID_CONTROL_FIELD); |
| |
| /* Hide L1D cache contents from the nested guest. */ |
| vmx->vcpu.arch.l1tf_flush_l1d = true; |
| |
| /* |
| * Must happen outside of nested_vmx_enter_non_root_mode() as it will |
| * also be used as part of restoring nVMX state for |
| * snapshot restore (migration). |
| * |
| * In this flow, it is assumed that vmcs12 cache was |
| * trasferred as part of captured nVMX state and should |
| * therefore not be read from guest memory (which may not |
| * exist on destination host yet). |
| */ |
| nested_cache_shadow_vmcs12(vcpu, vmcs12); |
| |
| /* |
| * If we're entering a halted L2 vcpu and the L2 vcpu won't be woken |
| * by event injection, halt vcpu. |
| */ |
| if ((vmcs12->guest_activity_state == GUEST_ACTIVITY_HLT) && |
| !(vmcs12->vm_entry_intr_info_field & INTR_INFO_VALID_MASK)) { |
| vmx->nested.nested_run_pending = 0; |
| return kvm_vcpu_halt(vcpu); |
| } |
| return 1; |
| } |
| |
| /* |
| * On a nested exit from L2 to L1, vmcs12.guest_cr0 might not be up-to-date |
| * because L2 may have changed some cr0 bits directly (CRO_GUEST_HOST_MASK). |
| * This function returns the new value we should put in vmcs12.guest_cr0. |
| * It's not enough to just return the vmcs02 GUEST_CR0. Rather, |
| * 1. Bits that neither L0 nor L1 trapped, were set directly by L2 and are now |
| * available in vmcs02 GUEST_CR0. (Note: It's enough to check that L0 |
| * didn't trap the bit, because if L1 did, so would L0). |
| * 2. Bits that L1 asked to trap (and therefore L0 also did) could not have |
| * been modified by L2, and L1 knows it. So just leave the old value of |
| * the bit from vmcs12.guest_cr0. Note that the bit from vmcs02 GUEST_CR0 |
| * isn't relevant, because if L0 traps this bit it can set it to anything. |
| * 3. Bits that L1 didn't trap, but L0 did. L1 believes the guest could have |
| * changed these bits, and therefore they need to be updated, but L0 |
| * didn't necessarily allow them to be changed in GUEST_CR0 - and rather |
| * put them in vmcs02 CR0_READ_SHADOW. So take these bits from there. |
| */ |
| static inline unsigned long |
| vmcs12_guest_cr0(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) |
| { |
| return |
| /*1*/ (vmcs_readl(GUEST_CR0) & vcpu->arch.cr0_guest_owned_bits) | |
| /*2*/ (vmcs12->guest_cr0 & vmcs12->cr0_guest_host_mask) | |
| /*3*/ (vmcs_readl(CR0_READ_SHADOW) & ~(vmcs12->cr0_guest_host_mask | |
| vcpu->arch.cr0_guest_owned_bits)); |
| } |
| |
| static inline unsigned long |
| vmcs12_guest_cr4(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) |
| { |
| return |
| /*1*/ (vmcs_readl(GUEST_CR4) & vcpu->arch.cr4_guest_owned_bits) | |
| /*2*/ (vmcs12->guest_cr4 & vmcs12->cr4_guest_host_mask) | |
| /*3*/ (vmcs_readl(CR4_READ_SHADOW) & ~(vmcs12->cr4_guest_host_mask | |
| vcpu->arch.cr4_guest_owned_bits)); |
| } |
| |
| static void vmcs12_save_pending_event(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| u32 idt_vectoring; |
| unsigned int nr; |
| |
| if (vcpu->arch.exception.injected) { |
| nr = vcpu->arch.exception.nr; |
| idt_vectoring = nr | VECTORING_INFO_VALID_MASK; |
| |
| if (kvm_exception_is_soft(nr)) { |
| vmcs12->vm_exit_instruction_len = |
| vcpu->arch.event_exit_inst_len; |
| idt_vectoring |= INTR_TYPE_SOFT_EXCEPTION; |
| } else |
| idt_vectoring |= INTR_TYPE_HARD_EXCEPTION; |
| |
| if (vcpu->arch.exception.has_error_code) { |
| idt_vectoring |= VECTORING_INFO_DELIVER_CODE_MASK; |
| vmcs12->idt_vectoring_error_code = |
| vcpu->arch.exception.error_code; |
| } |
| |
| vmcs12->idt_vectoring_info_field = idt_vectoring; |
| } else if (vcpu->arch.nmi_injected) { |
| vmcs12->idt_vectoring_info_field = |
| INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR; |
| } else if (vcpu->arch.interrupt.injected) { |
| nr = vcpu->arch.interrupt.nr; |
| idt_vectoring = nr | VECTORING_INFO_VALID_MASK; |
| |
| if (vcpu->arch.interrupt.soft) { |
| idt_vectoring |= INTR_TYPE_SOFT_INTR; |
| vmcs12->vm_entry_instruction_len = |
| vcpu->arch.event_exit_inst_len; |
| } else |
| idt_vectoring |= INTR_TYPE_EXT_INTR; |
| |
| vmcs12->idt_vectoring_info_field = idt_vectoring; |
| } |
| } |
| |
| static int vmx_check_nested_events(struct kvm_vcpu *vcpu, bool external_intr) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| unsigned long exit_qual; |
| bool block_nested_events = |
| vmx->nested.nested_run_pending || kvm_event_needs_reinjection(vcpu); |
| |
| if (vcpu->arch.exception.pending && |
| nested_vmx_check_exception(vcpu, &exit_qual)) { |
| if (block_nested_events) |
| return -EBUSY; |
| nested_vmx_inject_exception_vmexit(vcpu, exit_qual); |
| return 0; |
| } |
| |
| if (nested_cpu_has_preemption_timer(get_vmcs12(vcpu)) && |
| vmx->nested.preemption_timer_expired) { |
| if (block_nested_events) |
| return -EBUSY; |
| nested_vmx_vmexit(vcpu, EXIT_REASON_PREEMPTION_TIMER, 0, 0); |
| return 0; |
| } |
| |
| if (vcpu->arch.nmi_pending && nested_exit_on_nmi(vcpu)) { |
| if (block_nested_events) |
| return -EBUSY; |
| nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI, |
| NMI_VECTOR | INTR_TYPE_NMI_INTR | |
| INTR_INFO_VALID_MASK, 0); |
| /* |
| * The NMI-triggered VM exit counts as injection: |
| * clear this one and block further NMIs. |
| */ |
| vcpu->arch.nmi_pending = 0; |
| vmx_set_nmi_mask(vcpu, true); |
| return 0; |
| } |
| |
| if ((kvm_cpu_has_interrupt(vcpu) || external_intr) && |
| nested_exit_on_intr(vcpu)) { |
| if (block_nested_events) |
| return -EBUSY; |
| nested_vmx_vmexit(vcpu, EXIT_REASON_EXTERNAL_INTERRUPT, 0, 0); |
| return 0; |
| } |
| |
| vmx_complete_nested_posted_interrupt(vcpu); |
| return 0; |
| } |
| |
| static void vmx_request_immediate_exit(struct kvm_vcpu *vcpu) |
| { |
| to_vmx(vcpu)->req_immediate_exit = true; |
| } |
| |
| static u32 vmx_get_preemption_timer_value(struct kvm_vcpu *vcpu) |
| { |
| ktime_t remaining = |
| hrtimer_get_remaining(&to_vmx(vcpu)->nested.preemption_timer); |
| u64 value; |
| |
| if (ktime_to_ns(remaining) <= 0) |
| return 0; |
| |
| value = ktime_to_ns(remaining) * vcpu->arch.virtual_tsc_khz; |
| do_div(value, 1000000); |
| return value >> VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE; |
| } |
| |
| /* |
| * Update the guest state fields of vmcs12 to reflect changes that |
| * occurred while L2 was running. (The "IA-32e mode guest" bit of the |
| * VM-entry controls is also updated, since this is really a guest |
| * state bit.) |
| */ |
| static void sync_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) |
| { |
| vmcs12->guest_cr0 = vmcs12_guest_cr0(vcpu, vmcs12); |
| vmcs12->guest_cr4 = vmcs12_guest_cr4(vcpu, vmcs12); |
| |
| vmcs12->guest_rsp = kvm_register_read(vcpu, VCPU_REGS_RSP); |
| vmcs12->guest_rip = kvm_register_read(vcpu, VCPU_REGS_RIP); |
| vmcs12->guest_rflags = vmcs_readl(GUEST_RFLAGS); |
| |
| vmcs12->guest_es_selector = vmcs_read16(GUEST_ES_SELECTOR); |
| vmcs12->guest_cs_selector = vmcs_read16(GUEST_CS_SELECTOR); |
| vmcs12->guest_ss_selector = vmcs_read16(GUEST_SS_SELECTOR); |
| vmcs12->guest_ds_selector = vmcs_read16(GUEST_DS_SELECTOR); |
| vmcs12->guest_fs_selector = vmcs_read16(GUEST_FS_SELECTOR); |
| vmcs12->guest_gs_selector = vmcs_read16(GUEST_GS_SELECTOR); |
| vmcs12->guest_ldtr_selector = vmcs_read16(GUEST_LDTR_SELECTOR); |
| vmcs12->guest_tr_selector = vmcs_read16(GUEST_TR_SELECTOR); |
| vmcs12->guest_es_limit = vmcs_read32(GUEST_ES_LIMIT); |
| vmcs12->guest_cs_limit = vmcs_read32(GUEST_CS_LIMIT); |
| vmcs12->guest_ss_limit = vmcs_read32(GUEST_SS_LIMIT); |
| vmcs12->guest_ds_limit = vmcs_read32(GUEST_DS_LIMIT); |
| vmcs12->guest_fs_limit = vmcs_read32(GUEST_FS_LIMIT); |
| vmcs12->guest_gs_limit = vmcs_read32(GUEST_GS_LIMIT); |
| vmcs12->guest_ldtr_limit = vmcs_read32(GUEST_LDTR_LIMIT); |
| vmcs12->guest_tr_limit = vmcs_read32(GUEST_TR_LIMIT); |
| vmcs12->guest_gdtr_limit = vmcs_read32(GUEST_GDTR_LIMIT); |
| vmcs12->guest_idtr_limit = vmcs_read32(GUEST_IDTR_LIMIT); |
| vmcs12->guest_es_ar_bytes = vmcs_read32(GUEST_ES_AR_BYTES); |
| vmcs12->guest_cs_ar_bytes = vmcs_read32(GUEST_CS_AR_BYTES); |
| vmcs12->guest_ss_ar_bytes = vmcs_read32(GUEST_SS_AR_BYTES); |
| vmcs12->guest_ds_ar_bytes = vmcs_read32(GUEST_DS_AR_BYTES); |
| vmcs12->guest_fs_ar_bytes = vmcs_read32(GUEST_FS_AR_BYTES); |
| vmcs12->guest_gs_ar_bytes = vmcs_read32(GUEST_GS_AR_BYTES); |
| vmcs12->guest_ldtr_ar_bytes = vmcs_read32(GUEST_LDTR_AR_BYTES); |
| vmcs12->guest_tr_ar_bytes = vmcs_read32(GUEST_TR_AR_BYTES); |
| vmcs12->guest_es_base = vmcs_readl(GUEST_ES_BASE); |
| vmcs12->guest_cs_base = vmcs_readl(GUEST_CS_BASE); |
| vmcs12->guest_ss_base = vmcs_readl(GUEST_SS_BASE); |
| vmcs12->guest_ds_base = vmcs_readl(GUEST_DS_BASE); |
| vmcs12->guest_fs_base = vmcs_readl(GUEST_FS_BASE); |
| vmcs12->guest_gs_base = vmcs_readl(GUEST_GS_BASE); |
| vmcs12->guest_ldtr_base = vmcs_readl(GUEST_LDTR_BASE); |
| vmcs12->guest_tr_base = vmcs_readl(GUEST_TR_BASE); |
| vmcs12->guest_gdtr_base = vmcs_readl(GUEST_GDTR_BASE); |
| vmcs12->guest_idtr_base = vmcs_readl(GUEST_IDTR_BASE); |
| |
| vmcs12->guest_interruptibility_info = |
| vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); |
| vmcs12->guest_pending_dbg_exceptions = |
| vmcs_readl(GUEST_PENDING_DBG_EXCEPTIONS); |
| if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED) |
| vmcs12->guest_activity_state = GUEST_ACTIVITY_HLT; |
| else |
| vmcs12->guest_activity_state = GUEST_ACTIVITY_ACTIVE; |
| |
| if (nested_cpu_has_preemption_timer(vmcs12)) { |
| if (vmcs12->vm_exit_controls & |
| VM_EXIT_SAVE_VMX_PREEMPTION_TIMER) |
| vmcs12->vmx_preemption_timer_value = |
| vmx_get_preemption_timer_value(vcpu); |
| hrtimer_cancel(&to_vmx(vcpu)->nested.preemption_timer); |
| } |
| |
| /* |
| * In some cases (usually, nested EPT), L2 is allowed to change its |
| * own CR3 without exiting. If it has changed it, we must keep it. |
| * Of course, if L0 is using shadow page tables, GUEST_CR3 was defined |
| * by L0, not L1 or L2, so we mustn't unconditionally copy it to vmcs12. |
| * |
| * Additionally, restore L2's PDPTR to vmcs12. |
| */ |
| if (enable_ept) { |
| vmcs12->guest_cr3 = vmcs_readl(GUEST_CR3); |
| vmcs12->guest_pdptr0 = vmcs_read64(GUEST_PDPTR0); |
| vmcs12->guest_pdptr1 = vmcs_read64(GUEST_PDPTR1); |
| vmcs12->guest_pdptr2 = vmcs_read64(GUEST_PDPTR2); |
| vmcs12->guest_pdptr3 = vmcs_read64(GUEST_PDPTR3); |
| } |
| |
| vmcs12->guest_linear_address = vmcs_readl(GUEST_LINEAR_ADDRESS); |
| |
| if (nested_cpu_has_vid(vmcs12)) |
| vmcs12->guest_intr_status = vmcs_read16(GUEST_INTR_STATUS); |
| |
| vmcs12->vm_entry_controls = |
| (vmcs12->vm_entry_controls & ~VM_ENTRY_IA32E_MODE) | |
| (vm_entry_controls_get(to_vmx(vcpu)) & VM_ENTRY_IA32E_MODE); |
| |
| if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_DEBUG_CONTROLS) { |
| kvm_get_dr(vcpu, 7, (unsigned long *)&vmcs12->guest_dr7); |
| vmcs12->guest_ia32_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL); |
| } |
| |
| /* TODO: These cannot have changed unless we have MSR bitmaps and |
| * the relevant bit asks not to trap the change */ |
| if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_IA32_PAT) |
| vmcs12->guest_ia32_pat = vmcs_read64(GUEST_IA32_PAT); |
| if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_IA32_EFER) |
| vmcs12->guest_ia32_efer = vcpu->arch.efer; |
| vmcs12->guest_sysenter_cs = vmcs_read32(GUEST_SYSENTER_CS); |
| vmcs12->guest_sysenter_esp = vmcs_readl(GUEST_SYSENTER_ESP); |
| vmcs12->guest_sysenter_eip = vmcs_readl(GUEST_SYSENTER_EIP); |
| if (kvm_mpx_supported()) |
| vmcs12->guest_bndcfgs = vmcs_read64(GUEST_BNDCFGS); |
| } |
| |
| /* |
| * prepare_vmcs12 is part of what we need to do when the nested L2 guest exits |
| * and we want to prepare to run its L1 parent. L1 keeps a vmcs for L2 (vmcs12), |
| * and this function updates it to reflect the changes to the guest state while |
| * L2 was running (and perhaps made some exits which were handled directly by L0 |
| * without going back to L1), and to reflect the exit reason. |
| * Note that we do not have to copy here all VMCS fields, just those that |
| * could have changed by the L2 guest or the exit - i.e., the guest-state and |
| * exit-information fields only. Other fields are modified by L1 with VMWRITE, |
| * which already writes to vmcs12 directly. |
| */ |
| static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, |
| u32 exit_reason, u32 exit_intr_info, |
| unsigned long exit_qualification) |
| { |
| /* update guest state fields: */ |
| sync_vmcs12(vcpu, vmcs12); |
| |
| /* update exit information fields: */ |
| |
| vmcs12->vm_exit_reason = exit_reason; |
| vmcs12->exit_qualification = exit_qualification; |
| vmcs12->vm_exit_intr_info = exit_intr_info; |
| |
| vmcs12->idt_vectoring_info_field = 0; |
| vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN); |
| vmcs12->vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); |
| |
| if (!(vmcs12->vm_exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) { |
| vmcs12->launch_state = 1; |
| |
| /* vm_entry_intr_info_field is cleared on exit. Emulate this |
| * instead of reading the real value. */ |
| vmcs12->vm_entry_intr_info_field &= ~INTR_INFO_VALID_MASK; |
| |
| /* |
| * Transfer the event that L0 or L1 may wanted to inject into |
| * L2 to IDT_VECTORING_INFO_FIELD. |
| */ |
| vmcs12_save_pending_event(vcpu, vmcs12); |
| } |
| |
| /* |
| * Drop what we picked up for L2 via vmx_complete_interrupts. It is |
| * preserved above and would only end up incorrectly in L1. |
| */ |
| vcpu->arch.nmi_injected = false; |
| kvm_clear_exception_queue(vcpu); |
| kvm_clear_interrupt_queue(vcpu); |
| } |
| |
| /* |
| * A part of what we need to when the nested L2 guest exits and we want to |
| * run its L1 parent, is to reset L1's guest state to the host state specified |
| * in vmcs12. |
| * This function is to be called not only on normal nested exit, but also on |
| * a nested entry failure, as explained in Intel's spec, 3B.23.7 ("VM-Entry |
| * Failures During or After Loading Guest State"). |
| * This function should be called when the active VMCS is L1's (vmcs01). |
| */ |
| static void load_vmcs12_host_state(struct kvm_vcpu *vcpu, |
| struct vmcs12 *vmcs12) |
| { |
| struct kvm_segment seg; |
| u32 entry_failure_code; |
| |
| if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER) |
| vcpu->arch.efer = vmcs12->host_ia32_efer; |
| else if (vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE) |
| vcpu->arch.efer |= (EFER_LMA | EFER_LME); |
| else |
| vcpu->arch.efer &= ~(EFER_LMA | EFER_LME); |
| vmx_set_efer(vcpu, vcpu->arch.efer); |
| |
| kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->host_rsp); |
| kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->host_rip); |
| vmx_set_rflags(vcpu, X86_EFLAGS_FIXED); |
| vmx_set_interrupt_shadow(vcpu, 0); |
| |
| /* |
| * Note that calling vmx_set_cr0 is important, even if cr0 hasn't |
| * actually changed, because vmx_set_cr0 refers to efer set above. |
| * |
| * CR0_GUEST_HOST_MASK is already set in the original vmcs01 |
| * (KVM doesn't change it); |
| */ |
| vcpu->arch.cr0_guest_owned_bits = X86_CR0_TS; |
| vmx_set_cr0(vcpu, vmcs12->host_cr0); |
| |
| /* Same as above - no reason to call set_cr4_guest_host_mask(). */ |
| vcpu->arch.cr4_guest_owned_bits = ~vmcs_readl(CR4_GUEST_HOST_MASK); |
| vmx_set_cr4(vcpu, vmcs12->host_cr4); |
| |
| nested_ept_uninit_mmu_context(vcpu); |
| |
| /* |
| * Only PDPTE load can fail as the value of cr3 was checked on entry and |
| * couldn't have changed. |
| */ |
| if (nested_vmx_load_cr3(vcpu, vmcs12->host_cr3, false, &entry_failure_code)) |
| nested_vmx_abort(vcpu, VMX_ABORT_LOAD_HOST_PDPTE_FAIL); |
| |
| if (!enable_ept) |
| vcpu->arch.walk_mmu->inject_page_fault = kvm_inject_page_fault; |
| |
| /* |
| * If vmcs01 doesn't use VPID, CPU flushes TLB on every |
| * VMEntry/VMExit. Thus, no need to flush TLB. |
| * |
| * If vmcs12 doesn't use VPID, L1 expects TLB to be |
| * flushed on every VMEntry/VMExit. |
| * |
| * Otherwise, we can preserve TLB entries as long as we are |
| * able to tag L1 TLB entries differently than L2 TLB entries. |
| * |
| * If vmcs12 uses EPT, we need to execute this flush on EPTP01 |
| * and therefore we request the TLB flush to happen only after VMCS EPTP |
| * has been set by KVM_REQ_LOAD_CR3. |
| */ |
| if (enable_vpid && |
| (!nested_cpu_has_vpid(vmcs12) || !nested_has_guest_tlb_tag(vcpu))) { |
| kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
| } |
| |
| vmcs_write32(GUEST_SYSENTER_CS, vmcs12->host_ia32_sysenter_cs); |
| vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->host_ia32_sysenter_esp); |
| vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->host_ia32_sysenter_eip); |
| vmcs_writel(GUEST_IDTR_BASE, vmcs12->host_idtr_base); |
| vmcs_writel(GUEST_GDTR_BASE, vmcs12->host_gdtr_base); |
| vmcs_write32(GUEST_IDTR_LIMIT, 0xFFFF); |
| vmcs_write32(GUEST_GDTR_LIMIT, 0xFFFF); |
| |
| /* If not VM_EXIT_CLEAR_BNDCFGS, the L2 value propagates to L1. */ |
| if (vmcs12->vm_exit_controls & VM_EXIT_CLEAR_BNDCFGS) |
| vmcs_write64(GUEST_BNDCFGS, 0); |
| |
| if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PAT) { |
| vmcs_write64(GUEST_IA32_PAT, vmcs12->host_ia32_pat); |
| vcpu->arch.pat = vmcs12->host_ia32_pat; |
| } |
| if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL) |
| vmcs_write64(GUEST_IA32_PERF_GLOBAL_CTRL, |
| vmcs12->host_ia32_perf_global_ctrl); |
| |
| /* Set L1 segment info according to Intel SDM |
| 27.5.2 Loading Host Segment and Descriptor-Table Registers */ |
| seg = (struct kvm_segment) { |
| .base = 0, |
| .limit = 0xFFFFFFFF, |
| .selector = vmcs12->host_cs_selector, |
| .type = 11, |
| .present = 1, |
| .s = 1, |
| .g = 1 |
| }; |
| if (vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE) |
| seg.l = 1; |
| else |
| seg.db = 1; |
| vmx_set_segment(vcpu, &seg, VCPU_SREG_CS); |
| seg = (struct kvm_segment) { |
| .base = 0, |
| .limit = 0xFFFFFFFF, |
| .type = 3, |
| .present = 1, |
| .s = 1, |
| .db = 1, |
| .g = 1 |
| }; |
| seg.selector = vmcs12->host_ds_selector; |
| vmx_set_segment(vcpu, &seg, VCPU_SREG_DS); |
| seg.selector = vmcs12->host_es_selector; |
| vmx_set_segment(vcpu, &seg, VCPU_SREG_ES); |
| seg.selector = vmcs12->host_ss_selector; |
| vmx_set_segment(vcpu, &seg, VCPU_SREG_SS); |
| seg.selector = vmcs12->host_fs_selector; |
| seg.base = vmcs12->host_fs_base; |
| vmx_set_segment(vcpu, &seg, VCPU_SREG_FS); |
| seg.selector = vmcs12->host_gs_selector; |
| seg.base = vmcs12->host_gs_base; |
| vmx_set_segment(vcpu, &seg, VCPU_SREG_GS); |
| seg = (struct kvm_segment) { |
| .base = vmcs12->host_tr_base, |
| .limit = 0x67, |
| .selector = vmcs12->host_tr_selector, |
| .type = 11, |
| .present = 1 |
| }; |
| vmx_set_segment(vcpu, &seg, VCPU_SREG_TR); |
| |
| kvm_set_dr(vcpu, 7, 0x400); |
| vmcs_write64(GUEST_IA32_DEBUGCTL, 0); |
| |
| if (cpu_has_vmx_msr_bitmap()) |
| vmx_update_msr_bitmap(vcpu); |
| |
| if (nested_vmx_load_msr(vcpu, vmcs12->vm_exit_msr_load_addr, |
| vmcs12->vm_exit_msr_load_count)) |
| nested_vmx_abort(vcpu, VMX_ABORT_LOAD_HOST_MSR_FAIL); |
| } |
| |
| static inline u64 nested_vmx_get_vmcs01_guest_efer(struct vcpu_vmx *vmx) |
| { |
| struct shared_msr_entry *efer_msr; |
| unsigned int i; |
| |
| if (vm_entry_controls_get(vmx) & VM_ENTRY_LOAD_IA32_EFER) |
| return vmcs_read64(GUEST_IA32_EFER); |
| |
| if (cpu_has_load_ia32_efer) |
| return host_efer; |
| |
| for (i = 0; i < vmx->msr_autoload.guest.nr; ++i) { |
| if (vmx->msr_autoload.guest.val[i].index == MSR_EFER) |
| return vmx->msr_autoload.guest.val[i].value; |
| } |
| |
| efer_msr = find_msr_entry(vmx, MSR_EFER); |
| if (efer_msr) |
| return efer_msr->data; |
| |
| return host_efer; |
| } |
| |
| static void nested_vmx_restore_host_state(struct kvm_vcpu *vcpu) |
| { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct vmx_msr_entry g, h; |
| struct msr_data msr; |
| gpa_t gpa; |
| u32 i, j; |
| |
| vcpu->arch.pat = vmcs_read64(GUEST_IA32_PAT); |
| |
| if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS) { |
| /* |
| * L1's host DR7 is lost if KVM_GUESTDBG_USE_HW_BP is set |
| * as vmcs01.GUEST_DR7 contains a userspace defined value |
| * and vcpu->arch.dr7 is not squirreled away before the |
| * nested VMENTER (not worth adding a variable in nested_vmx). |
| */ |
| if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) |
| kvm_set_dr(vcpu, 7, DR7_FIXED_1); |
| else |
| WARN_ON(kvm_set_dr(vcpu, 7, vmcs_readl(GUEST_DR7))); |
| } |
| |
| /* |
| * Note that calling vmx_set_{efer,cr0,cr4} is important as they |
| * handle a variety of side effects to KVM's software model. |
| */ |
| vmx_set_efer(vcpu, nested_vmx_get_vmcs01_guest_efer(vmx)); |
| |
| vcpu->arch.cr0_guest_owned_bits = X86_CR0_TS; |
| vmx_set_cr0(vcpu, vmcs_readl(CR0_READ_SHADOW)); |
| |
| vcpu->arch.cr4_guest_owned_bits = ~vmcs_readl(CR4_GUEST_HOST_MASK); |
| vmx_set_cr4(vcpu, vmcs_readl(CR4_READ_SHADOW)); |
| |
| nested_ept_uninit_mmu_context(vcpu); |
| vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); |
| __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); |
| |
| /* |
| * Use ept_save_pdptrs(vcpu) to load the MMU's cached PDPTRs |
| * from vmcs01 (if necessary). The PDPTRs are not loaded on |
| * VMFail, like everything else we just need to ensure our |
| * software model is up-to-date. |
| */ |
| ept_save_pdptrs(vcpu); |
| |
| kvm_mmu_reset_context(vcpu); |
| |
| if (cpu_has_vmx_msr_bitmap()) |
| vmx_update_msr_bitmap(vcpu); |
| |
| /* |
| * This nasty bit of open coding is a compromise between blindly |
| * loading L1's MSRs using the exit load lists (incorrect emulation |
| * of VMFail), leaving the nested VM's MSRs in the software model |
| * (incorrect behavior) and snapshotting the modified MSRs (too |
| * expensive since the lists are unbound by hardware). For each |
| * MSR that was (prematurely) loaded from the nested VMEntry load |
| * list, reload it from the exit load list if it exists and differs |
| * from the guest value. The intent is to stuff host state as |
| * silently as possible, not to fully process the exit load list. |
| */ |
| msr.host_initiated = false; |
| for (i = 0; i < vmcs12->vm_entry_msr_load_count; i++) { |
| gpa = vmcs12->vm_entry_msr_load_addr + (i * sizeof(g)); |
| if (kvm_vcpu_read_guest(vcpu, gpa, &g, sizeof(g))) { |
| pr_debug_ratelimited( |
| "%s read MSR index failed (%u, 0x%08llx)\n", |
| __func__, i, gpa); |
| goto vmabort; |
| } |
| |
| for (j = 0; j < vmcs12->vm_exit_msr_load_count; j++) { |
| gpa = vmcs12->vm_exit_msr_load_addr + (j * sizeof(h)); |
| if (kvm_vcpu_read_guest(vcpu, gpa, &h, sizeof(h))) { |
| pr_debug_ratelimited( |
| "%s read MSR failed (%u, 0x%08llx)\n", |
| __func__, j, gpa); |
| goto vmabort; |
| } |
| if (h.index != g.index) |
| continue; |
| if (h.value == g.value) |
| break; |
| |
| if (nested_vmx_load_msr_check(vcpu, &h)) { |
| pr_debug_ratelimited( |
| "%s check failed (%u, 0x%x, 0x%x)\n", |
| __func__, j, h.index, h.reserved); |
| goto vmabort; |
| } |
| |
| msr.index = h.index; |
| msr.data = h.value; |
| if (kvm_set_msr(vcpu, &msr)) { |
| pr_debug_ratelimited( |
| "%s WRMSR failed (%u, 0x%x, 0x%llx)\n", |
| __func__, j, h.index, h.value); |
| goto vmabort; |
| } |
| } |
| } |
| |
| return; |
| |
| vmabort: |
| nested_vmx_abort(vcpu, VMX_ABORT_LOAD_HOST_MSR_FAIL); |
| } |
| |
| /* |
| * Emulate an exit from nested guest (L2) to L1, i.e., prepare to run L1 |
| * and modify vmcs12 to make it see what it would expect to see there if |
| * L2 was its real guest. Must only be called when in L2 (is_guest_mode()) |
| */ |
| static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason, |
| u32 exit_intr_info, |
| unsigned long exit_qualification) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| |
| /* trying to cancel vmlaunch/vmresume is a bug */ |
| WARN_ON_ONCE(vmx->nested.nested_run_pending); |
| |
| leave_guest_mode(vcpu); |
| |
| if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING) |
| vcpu->arch.tsc_offset -= vmcs12->tsc_offset; |
| |
| if (likely(!vmx->fail)) { |
| if (exit_reason == -1) |
| sync_vmcs12(vcpu, vmcs12); |
| else |
| prepare_vmcs12(vcpu, vmcs12, exit_reason, exit_intr_info, |
| exit_qualification); |
| |
| /* |
| * Must happen outside of sync_vmcs12() as it will |
| * also be used to capture vmcs12 cache as part of |
| * capturing nVMX state for snapshot (migration). |
| * |
| * Otherwise, this flush will dirty guest memory at a |
| * point it is already assumed by user-space to be |
| * immutable. |
| */ |
| nested_flush_cached_shadow_vmcs12(vcpu, vmcs12); |
| |
| if (nested_vmx_store_msr(vcpu, vmcs12->vm_exit_msr_store_addr, |
| vmcs12->vm_exit_msr_store_count)) |
| nested_vmx_abort(vcpu, VMX_ABORT_SAVE_GUEST_MSR_FAIL); |
| } else { |
| /* |
| * The only expected VM-instruction error is "VM entry with |
| * invalid control field(s)." Anything else indicates a |
| * problem with L0. And we should never get here with a |
| * VMFail of any type if early consistency checks are enabled. |
| */ |
| WARN_ON_ONCE(vmcs_read32(VM_INSTRUCTION_ERROR) != |
| VMXERR_ENTRY_INVALID_CONTROL_FIELD); |
| WARN_ON_ONCE(nested_early_check); |
| } |
| |
| vmx_switch_vmcs(vcpu, &vmx->vmcs01); |
| |
| /* Update any VMCS fields that might have changed while L2 ran */ |
| vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, vmx->msr_autoload.host.nr); |
| vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_autoload.guest.nr); |
| vmcs_write64(TSC_OFFSET, vcpu->arch.tsc_offset); |
| |
| if (kvm_has_tsc_control) |
| decache_tsc_multiplier(vmx); |
| |
| if (vmx->nested.change_vmcs01_virtual_apic_mode) { |
| vmx->nested.change_vmcs01_virtual_apic_mode = false; |
| vmx_set_virtual_apic_mode(vcpu); |
| } else if (!nested_cpu_has_ept(vmcs12) && |
| nested_cpu_has2(vmcs12, |
| SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) { |
| vmx_flush_tlb(vcpu, true); |
| } |
| |
| /* This is needed for same reason as it was needed in prepare_vmcs02 */ |
| vmx->host_rsp = 0; |
| |
| /* Unpin physical memory we referred to in vmcs02 */ |
| if (vmx->nested.apic_access_page) { |
| kvm_release_page_dirty(vmx->nested.apic_access_page); |
| vmx->nested.apic_access_page = NULL; |
| } |
| if (vmx->nested.virtual_apic_page) { |
| kvm_release_page_dirty(vmx->nested.virtual_apic_page); |
| vmx->nested.virtual_apic_page = NULL; |
| } |
| if (vmx->nested.pi_desc_page) { |
| kunmap(vmx->nested.pi_desc_page); |
| kvm_release_page_dirty(vmx->nested.pi_desc_page); |
| vmx->nested.pi_desc_page = NULL; |
| vmx->nested.pi_desc = NULL; |
| } |
| |
| /* |
| * We are now running in L2, mmu_notifier will force to reload the |
| * page's hpa for L2 vmcs. Need to reload it for L1 before entering L1. |
| */ |
| kvm_make_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu); |
| |
| if (enable_shadow_vmcs && exit_reason != -1) |
| vmx->nested.sync_shadow_vmcs = true; |
| |
| /* in case we halted in L2 */ |
| vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; |
| |
| if (likely(!vmx->fail)) { |
| /* |
| * TODO: SDM says that with acknowledge interrupt on |
| * exit, bit 31 of the VM-exit interrupt information |
| * (valid interrupt) is always set to 1 on |
| * EXIT_REASON_EXTERNAL_INTERRUPT, so we shouldn't |
| * need kvm_cpu_has_interrupt(). See the commit |
| * message for details. |
| */ |
| if (nested_exit_intr_ack_set(vcpu) && |
| exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT && |
| kvm_cpu_has_interrupt(vcpu)) { |
| int irq = kvm_cpu_get_interrupt(vcpu); |
| WARN_ON(irq < 0); |
| vmcs12->vm_exit_intr_info = irq | |
| INTR_INFO_VALID_MASK | INTR_TYPE_EXT_INTR; |
| } |
| |
| if (exit_reason != -1) |
| trace_kvm_nested_vmexit_inject(vmcs12->vm_exit_reason, |
| vmcs12->exit_qualification, |
| vmcs12->idt_vectoring_info_field, |
| vmcs12->vm_exit_intr_info, |
| vmcs12->vm_exit_intr_error_code, |
| KVM_ISA_VMX); |
| |
| load_vmcs12_host_state(vcpu, vmcs12); |
| |
| return; |
| } |
| |
| /* |
| * After an early L2 VM-entry failure, we're now back |
| * in L1 which thinks it just finished a VMLAUNCH or |
| * VMRESUME instruction, so we need to set the failure |
| * flag and the VM-instruction error field of the VMCS |
| * accordingly, and skip the emulated instruction. |
| */ |
| (void)nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); |
| |
| /* |
| * Restore L1's host state to KVM's software model. We're here |
| * because a consistency check was caught by hardware, which |
| * means some amount of guest state has been propagated to KVM's |
| * model and needs to be unwound to the host's state. |
| */ |
| nested_vmx_restore_host_state(vcpu); |
| |
| vmx->fail = 0; |
| } |
| |
| /* |
| * Forcibly leave nested mode in order to be able to reset the VCPU later on. |
| */ |
| static void vmx_leave_nested(struct kvm_vcpu *vcpu) |
| { |
| if (is_guest_mode(vcpu)) { |
| to_vmx(vcpu)->nested.nested_run_pending = 0; |
| nested_vmx_vmexit(vcpu, -1, 0, 0); |
| } |
| free_nested(to_vmx(vcpu)); |
| } |
| |
| static int vmx_check_intercept(struct kvm_vcpu *vcpu, |
| struct x86_instruction_info *info, |
| enum x86_intercept_stage stage) |
| { |
| struct vmcs12 *vmcs12 = get_vmcs12(vcpu); |
| struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; |
| |
| /* |
| * RDPID causes #UD if disabled through secondary execution controls. |
| * Because it is marked as EmulateOnUD, we need to intercept it here. |
| */ |
| if (info->intercept == x86_intercept_rdtscp && |
| !nested_cpu_has2(vmcs12, SECONDARY_EXEC_RDTSCP)) { |
| ctxt->exception.vector = UD_VECTOR; |
| ctxt->exception.error_code_valid = false; |
| return X86EMUL_PROPAGATE_FAULT; |
| } |
| |
| /* TODO: check more intercepts... */ |
| return X86EMUL_CONTINUE; |
| } |
| |
| #ifdef CONFIG_X86_64 |
| /* (a << shift) / divisor, return 1 if overflow otherwise 0 */ |
| static inline int u64_shl_div_u64(u64 a, unsigned int shift, |
| u64 divisor, u64 *result) |
| { |
| u64 low = a << shift, high = a >> (64 - shift); |
| |
| /* To avoid the overflow on divq */ |
| if (high >= divisor) |
| return 1; |
| |
| /* Low hold the result, high hold rem which is discarded */ |
| asm("divq %2\n\t" : "=a" (low), "=d" (high) : |
| "rm" (divisor), "0" (low), "1" (high)); |
| *result = low; |
| |
| return 0; |
| } |
| |
| static int vmx_set_hv_timer(struct kvm_vcpu *vcpu, u64 guest_deadline_tsc) |
| { |
| struct vcpu_vmx *vmx; |
| u64 tscl, guest_tscl, delta_tsc, lapic_timer_advance_cycles; |
| |
| if (kvm_mwait_in_guest(vcpu->kvm)) |
| return -EOPNOTSUPP; |
| |
| vmx = to_vmx(vcpu); |
| tscl = rdtsc(); |
| guest_tscl = kvm_read_l1_tsc(vcpu, tscl); |
| delta_tsc = max(guest_deadline_tsc, guest_tscl) - guest_tscl; |
| lapic_timer_advance_cycles = nsec_to_cycles(vcpu, lapic_timer_advance_ns); |
| |
| if (delta_tsc > lapic_timer_advance_cycles) |
| delta_tsc -= lapic_timer_advance_cycles; |
| else |
| delta_tsc = 0; |
| |
| /* Convert to host delta tsc if tsc scaling is enabled */ |
| if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio && |
| u64_shl_div_u64(delta_tsc, |
| kvm_tsc_scaling_ratio_frac_bits, |
| vcpu->arch.tsc_scaling_ratio, |
| &delta_tsc)) |
| return -ERANGE; |
| |
| /* |
| * If the delta tsc can't fit in the 32 bit after the multi shift, |
| * we can't use the preemption timer. |
| * It's possible that it fits on later vmentries, but checking |
| * on every vmentry is costly so we just use an hrtimer. |
| */ |
| if (delta_tsc >> (cpu_preemption_timer_multi + 32)) |
| return -ERANGE; |
| |
| vmx->hv_deadline_tsc = tscl + delta_tsc; |
| return delta_tsc == 0; |
| } |
| |
| static void vmx_cancel_hv_timer(struct kvm_vcpu *vcpu) |
| { |
| to_vmx(vcpu)->hv_deadline_tsc = -1; |
| } |
| #endif |
| |
| static void vmx_sched_in(struct kvm_vcpu *vcpu, int cpu) |
| { |
| if (!kvm_pause_in_guest(vcpu->kvm)) |
| shrink_ple_window(vcpu); |
| } |
| |
| static void vmx_slot_enable_log_dirty(struct kvm *kvm, |
| struct kvm_memory_slot *slot) |
| { |
| kvm_mmu_slot_leaf_clear_dirty(kvm, slot); |
| kvm_mmu_slot_largepage_remove_write_access(kvm, slot); |
| } |
| |
| static void vmx_slot_disable_log_dirty(struct kvm *kvm, |
| struct kvm_memory_slot *slot) |
| { |
| kvm_mmu_slot_set_dirty(kvm, slot); |
| } |
| |
| static void vmx_flush_log_dirty(struct kvm *kvm) |
| { |
| kvm_flush_pml_buffers(kvm); |
| } |
| |
| static int vmx_write_pml_buffer(struct kvm_vcpu *vcpu) |
| { |
| struct vmcs12 *vmcs12; |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| gpa_t gpa; |
| struct page *page = NULL; |
| u64 *pml_address; |
| |
| if (is_guest_mode(vcpu)) { |
| WARN_ON_ONCE(vmx->nested.pml_full); |
| |
| /* |
| * Check if PML is enabled for the nested guest. |
| * Whether eptp bit 6 is set is already checked |
| * as part of A/D emulation. |
| */ |
| vmcs12 = get_vmcs12(vcpu); |
| if (!nested_cpu_has_pml(vmcs12)) |
| return 0; |
| |
| if (vmcs12->guest_pml_index >= PML_ENTITY_NUM) { |
| vmx->nested.pml_full = true; |
| return 1; |
| } |
| |
| gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS) & ~0xFFFull; |
| |
| page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->pml_address); |
| if (is_error_page(page)) |
| return 0; |
| |
| pml_address = kmap(page); |
| pml_address[vmcs12->guest_pml_index--] = gpa; |
| kunmap(page); |
| kvm_release_page_clean(page); |
| } |
| |
| return 0; |
| } |
| |
| static void vmx_enable_log_dirty_pt_masked(struct kvm *kvm, |
| struct kvm_memory_slot *memslot, |
| gfn_t offset, unsigned long mask) |
| { |
| kvm_mmu_clear_dirty_pt_masked(kvm, memslot, offset, mask); |
| } |
| |
| static void __pi_post_block(struct kvm_vcpu *vcpu) |
| { |
| struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); |
| struct pi_desc old, new; |
| unsigned int dest; |
| |
| do { |
| old.control = new.control = pi_desc->control; |
| WARN(old.nv != POSTED_INTR_WAKEUP_VECTOR, |
| "Wakeup handler not enabled while the VCPU is blocked\n"); |
| |
| dest = cpu_physical_id(vcpu->cpu); |
| |
| if (x2apic_enabled()) |
| new.ndst = dest; |
| else |
| new.ndst = (dest << 8) & 0xFF00; |
| |
| /* set 'NV' to 'notification vector' */ |
| new.nv = POSTED_INTR_VECTOR; |
| } while (cmpxchg64(&pi_desc->control, old.control, |
| new.control) != old.control); |
| |
| if (!WARN_ON_ONCE(vcpu->pre_pcpu == -1)) { |
| spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu)); |
| list_del(&vcpu->blocked_vcpu_list); |
| spin_unlock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu)); |
| vcpu->pre_pcpu = -1; |
| } |
| } |
| |
| /* |
| * This routine does the following things for vCPU which is going |
| * to be blocked if VT-d PI is enabled. |
| * - Store the vCPU to the wakeup list, so when interrupts happen |
| * we can find the right vCPU to wake up. |
| * - Change the Posted-interrupt descriptor as below: |
| * 'NDST' <-- vcpu->pre_pcpu |
| * 'NV' <-- POSTED_INTR_WAKEUP_VECTOR |
| * - If 'ON' is set during this process, which means at least one |
| * interrupt is posted for this vCPU, we cannot block it, in |
| * this case, return 1, otherwise, return 0. |
| * |
| */ |
| static int pi_pre_block(struct kvm_vcpu *vcpu) |
| { |
| unsigned int dest; |
| struct pi_desc old, new; |
| struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu); |
| |
| if (!kvm_arch_has_assigned_device(vcpu->kvm) || |
| !irq_remapping_cap(IRQ_POSTING_CAP) || |
| !kvm_vcpu_apicv_active(vcpu)) |
| return 0; |
| |
| WARN_ON(irqs_disabled()); |
| local_irq_disable(); |
| if (!WARN_ON_ONCE(vcpu->pre_pcpu != -1)) { |
| vcpu->pre_pcpu = vcpu->cpu; |
| spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu)); |
| list_add_tail(&vcpu->blocked_vcpu_list, |
| &per_cpu(blocked_vcpu_on_cpu, |
| vcpu->pre_pcpu)); |
| spin_unlock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu)); |
| } |
| |
| do { |
| old.control = new.control = pi_desc->control; |
| |
| WARN((pi_desc->sn == 1), |
| "Warning: SN field of posted-interrupts " |
| "is set before blocking\n"); |
| |
| /* |
| * Since vCPU can be preempted during this process, |
| * vcpu->cpu could be different with pre_pcpu, we |
| * need to set pre_pcpu as the destination of wakeup |
| * notification event, then we can find the right vCPU |
| * to wakeup in wakeup handler if interrupts happen |
| * when the vCPU is in blocked state. |
| */ |
| dest = cpu_physical_id(vcpu->pre_pcpu); |
| |
| if (x2apic_enabled()) |
| new.ndst = dest; |
| else |
| new.ndst = (dest << 8) & 0xFF00; |
| |
| /* set 'NV' to 'wakeup vector' */ |
| new.nv = POSTED_INTR_WAKEUP_VECTOR; |
| } while (cmpxchg64(&pi_desc->control, old.control, |
| new.control) != old.control); |
| |
| /* We should not block the vCPU if an interrupt is posted for it. */ |
| if (pi_test_on(pi_desc) == 1) |
| __pi_post_block(vcpu); |
| |
| local_irq_enable(); |
| return (vcpu->pre_pcpu == -1); |
| } |
| |
| static int vmx_pre_block(struct kvm_vcpu *vcpu) |
| { |
| if (pi_pre_block(vcpu)) |
| return 1; |
| |
| if (kvm_lapic_hv_timer_in_use(vcpu)) |
| kvm_lapic_switch_to_sw_timer(vcpu); |
| |
| return 0; |
| } |
| |
| static void pi_post_block(struct kvm_vcpu *vcpu) |
| { |
| if (vcpu->pre_pcpu == -1) |
| return; |
| |
| WARN_ON(irqs_disabled()); |
| local_irq_disable(); |
| __pi_post_block(vcpu); |
| local_irq_enable(); |
| } |
| |
| static void vmx_post_block(struct kvm_vcpu *vcpu) |
| { |
| if (kvm_x86_ops->set_hv_timer) |
| kvm_lapic_switch_to_hv_timer(vcpu); |
| |
| pi_post_block(vcpu); |
| } |
| |
| /* |
| * vmx_update_pi_irte - set IRTE for Posted-Interrupts |
| * |
| * @kvm: kvm |
| * @host_irq: host irq of the interrupt |
| * @guest_irq: gsi of the interrupt |
| * @set: set or unset PI |
| * returns 0 on success, < 0 on failure |
| */ |
| static int vmx_update_pi_irte(struct kvm *kvm, unsigned int host_irq, |
| uint32_t guest_irq, bool set) |
| { |
| struct kvm_kernel_irq_routing_entry *e; |
| struct kvm_irq_routing_table *irq_rt; |
| struct kvm_lapic_irq irq; |
| struct kvm_vcpu *vcpu; |
| struct vcpu_data vcpu_info; |
| int idx, ret = 0; |
| |
| if (!kvm_arch_has_assigned_device(kvm) || |
| !irq_remapping_cap(IRQ_POSTING_CAP) || |
| !kvm_vcpu_apicv_active(kvm->vcpus[0])) |
| return 0; |
| |
| idx = srcu_read_lock(&kvm->irq_srcu); |
| irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu); |
| if (guest_irq >= irq_rt->nr_rt_entries || |
| hlist_empty(&irq_rt->map[guest_irq])) { |
| pr_warn_once("no route for guest_irq %u/%u (broken user space?)\n", |
| guest_irq, irq_rt->nr_rt_entries); |
| goto out; |
| } |
| |
| hlist_for_each_entry(e, &irq_rt->map[guest_irq], link) { |
| if (e->type != KVM_IRQ_ROUTING_MSI) |
| continue; |
| /* |
| * VT-d PI cannot support posting multicast/broadcast |
| * interrupts to a vCPU, we still use interrupt remapping |
| * for these kind of interrupts. |
| * |
| * For lowest-priority interrupts, we only support |
| * those with single CPU as the destination, e.g. user |
| * configures the interrupts via /proc/irq or uses |
| * irqbalance to make the interrupts single-CPU. |
| * |
| * We will support full lowest-priority interrupt later. |
| */ |
| |
| kvm_set_msi_irq(kvm, e, &irq); |
| if (!kvm_intr_is_single_vcpu(kvm, &irq, &vcpu)) { |
| /* |
| * Make sure the IRTE is in remapped mode if |
| * we don't handle it in posted mode. |
| */ |
| ret = irq_set_vcpu_affinity(host_irq, NULL); |
| if (ret < 0) { |
| printk(KERN_INFO |
| "failed to back to remapped mode, irq: %u\n", |
| host_irq); |
| goto out; |
| } |
| |
| continue; |
| } |
| |
| vcpu_info.pi_desc_addr = __pa(vcpu_to_pi_desc(vcpu)); |
| vcpu_info.vector = irq.vector; |
| |
| trace_kvm_pi_irte_update(host_irq, vcpu->vcpu_id, e->gsi, |
| vcpu_info.vector, vcpu_info.pi_desc_addr, set); |
| |
| if (set) |
| ret = irq_set_vcpu_affinity(host_irq, &vcpu_info); |
| else |
| ret = irq_set_vcpu_affinity(host_irq, NULL); |
| |
| if (ret < 0) { |
| printk(KERN_INFO "%s: failed to update PI IRTE\n", |
| __func__); |
| goto out; |
| } |
| } |
| |
| ret = 0; |
| out: |
| srcu_read_unlock(&kvm->irq_srcu, idx); |
| return ret; |
| } |
| |
| static void vmx_setup_mce(struct kvm_vcpu *vcpu) |
| { |
| if (vcpu->arch.mcg_cap & MCG_LMCE_P) |
| to_vmx(vcpu)->msr_ia32_feature_control_valid_bits |= |
| FEATURE_CONTROL_LMCE; |
| else |
| to_vmx(vcpu)->msr_ia32_feature_control_valid_bits &= |
| ~FEATURE_CONTROL_LMCE; |
| } |
| |
| static int vmx_smi_allowed(struct kvm_vcpu *vcpu) |
| { |
| /* we need a nested vmexit to enter SMM, postpone if run is pending */ |
| if (to_vmx(vcpu)->nested.nested_run_pending) |
| return 0; |
| return 1; |
| } |
| |
| static int vmx_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| |
| vmx->nested.smm.guest_mode = is_guest_mode(vcpu); |
| if (vmx->nested.smm.guest_mode) |
| nested_vmx_vmexit(vcpu, -1, 0, 0); |
| |
| vmx->nested.smm.vmxon = vmx->nested.vmxon; |
| vmx->nested.vmxon = false; |
| vmx_clear_hlt(vcpu); |
| return 0; |
| } |
| |
| static int vmx_pre_leave_smm(struct kvm_vcpu *vcpu, u64 smbase) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| int ret; |
| |
| if (vmx->nested.smm.vmxon) { |
| vmx->nested.vmxon = true; |
| vmx->nested.smm.vmxon = false; |
| } |
| |
| if (vmx->nested.smm.guest_mode) { |
| vcpu->arch.hflags &= ~HF_SMM_MASK; |
| ret = nested_vmx_enter_non_root_mode(vcpu, false); |
| vcpu->arch.hflags |= HF_SMM_MASK; |
| if (ret) |
| return ret; |
| |
| vmx->nested.smm.guest_mode = false; |
| } |
| return 0; |
| } |
| |
| static int enable_smi_window(struct kvm_vcpu *vcpu) |
| { |
| return 0; |
| } |
| |
| static int vmx_get_nested_state(struct kvm_vcpu *vcpu, |
| struct kvm_nested_state __user *user_kvm_nested_state, |
| u32 user_data_size) |
| { |
| struct vcpu_vmx *vmx; |
| struct vmcs12 *vmcs12; |
| struct kvm_nested_state kvm_state = { |
| .flags = 0, |
| .format = 0, |
| .size = sizeof(kvm_state), |
| .vmx.vmxon_pa = -1ull, |
| .vmx.vmcs_pa = -1ull, |
| }; |
| |
| if (!vcpu) |
| return kvm_state.size + 2 * VMCS12_SIZE; |
| |
| vmx = to_vmx(vcpu); |
| vmcs12 = get_vmcs12(vcpu); |
| if (nested_vmx_allowed(vcpu) && |
| (vmx->nested.vmxon || vmx->nested.smm.vmxon)) { |
| kvm_state.vmx.vmxon_pa = vmx->nested.vmxon_ptr; |
| kvm_state.vmx.vmcs_pa = vmx->nested.current_vmptr; |
| |
| if (vmx->nested.current_vmptr != -1ull) { |
| kvm_state.size += VMCS12_SIZE; |
| |
| if (is_guest_mode(vcpu) && |
| nested_cpu_has_shadow_vmcs(vmcs12) && |
| vmcs12->vmcs_link_pointer != -1ull) |
| kvm_state.size += VMCS12_SIZE; |
| } |
| |
| if (vmx->nested.smm.vmxon) |
| kvm_state.vmx.smm.flags |= KVM_STATE_NESTED_SMM_VMXON; |
| |
| if (vmx->nested.smm.guest_mode) |
| kvm_state.vmx.smm.flags |= KVM_STATE_NESTED_SMM_GUEST_MODE; |
| |
| if (is_guest_mode(vcpu)) { |
| kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE; |
| |
| if (vmx->nested.nested_run_pending) |
| kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING; |
| } |
| } |
| |
| if (user_data_size < kvm_state.size) |
| goto out; |
| |
| if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state))) |
| return -EFAULT; |
| |
| if (vmx->nested.current_vmptr == -1ull) |
| goto out; |
| |
| /* |
| * When running L2, the authoritative vmcs12 state is in the |
| * vmcs02. When running L1, the authoritative vmcs12 state is |
| * in the shadow vmcs linked to vmcs01, unless |
| * sync_shadow_vmcs is set, in which case, the authoritative |
| * vmcs12 state is in the vmcs12 already. |
| */ |
| if (is_guest_mode(vcpu)) |
| sync_vmcs12(vcpu, vmcs12); |
| else if (enable_shadow_vmcs && !vmx->nested.sync_shadow_vmcs) |
| copy_shadow_to_vmcs12(vmx); |
| |
| if (copy_to_user(user_kvm_nested_state->data, vmcs12, sizeof(*vmcs12))) |
| return -EFAULT; |
| |
| if (nested_cpu_has_shadow_vmcs(vmcs12) && |
| vmcs12->vmcs_link_pointer != -1ull) { |
| if (copy_to_user(user_kvm_nested_state->data + VMCS12_SIZE, |
| get_shadow_vmcs12(vcpu), sizeof(*vmcs12))) |
| return -EFAULT; |
| } |
| |
| out: |
| return kvm_state.size; |
| } |
| |
| static int vmx_set_nested_state(struct kvm_vcpu *vcpu, |
| struct kvm_nested_state __user *user_kvm_nested_state, |
| struct kvm_nested_state *kvm_state) |
| { |
| struct vcpu_vmx *vmx = to_vmx(vcpu); |
| struct vmcs12 *vmcs12; |
| u32 exit_qual; |
| int ret; |
| |
| if (kvm_state->format != 0) |
| return -EINVAL; |
| |
| if (!nested_vmx_allowed(vcpu)) |
| return kvm_state->vmx.vmxon_pa == -1ull ? 0 : -EINVAL; |
| |
| if (kvm_state->vmx.vmxon_pa == -1ull) { |
| if (kvm_state->vmx.smm.flags) |
| return -EINVAL; |
| |
| if (kvm_state->vmx.vmcs_pa != -1ull) |
| return -EINVAL; |
| |
| vmx_leave_nested(vcpu); |
| return 0; |
| } |
| |
| if (!page_address_valid(vcpu, kvm_state->vmx.vmxon_pa)) |
| return -EINVAL; |
| |
| if (kvm_state->size < sizeof(kvm_state) + sizeof(*vmcs12)) |
| return -EINVAL; |
| |
| if (kvm_state->vmx.vmcs_pa == kvm_state->vmx.vmxon_pa || |
| !page_address_valid(vcpu, kvm_state->vmx.vmcs_pa)) |
| return -EINVAL; |
| |
| if ((kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE) && |
| (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) |
| return -EINVAL; |
| |
| if (kvm_state->vmx.smm.flags & |
| ~(KVM_STATE_NESTED_SMM_GUEST_MODE | KVM_STATE_NESTED_SMM_VMXON)) |
| return -EINVAL; |
| |
| /* |
| * SMM temporarily disables VMX, so we cannot be in guest mode, |
| * nor can VMLAUNCH/VMRESUME be pending. Outside SMM, SMM flags |
| * must be zero. |
| */ |
| if (is_smm(vcpu) ? kvm_state->flags : kvm_state->vmx.smm.flags) |
| return -EINVAL; |
| |
| if ((kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE) && |
| !(kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON)) |
| return -EINVAL; |
| |
| vmx_leave_nested(vcpu); |
| if (kvm_state->vmx.vmxon_pa == -1ull) |
| return 0; |
| |
| vmx->nested.vmxon_ptr = kvm_state->vmx.vmxon_pa; |
| ret = enter_vmx_operation(vcpu); |
| if (ret) |
| return ret; |
| |
| set_current_vmptr(vmx, kvm_state->vmx.vmcs_pa); |
| |
| if (kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON) { |
| vmx->nested.smm.vmxon = true; |
| vmx->nested.vmxon = false; |
| |
| if (kvm_state->vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE) |
| vmx->nested.smm.guest_mode = true; |
| } |
| |
| vmcs12 = get_vmcs12(vcpu); |
| if (copy_from_user(vmcs12, user_kvm_nested_state->data, sizeof(*vmcs12))) |
| return -EFAULT; |
| |
| if (vmcs12->hdr.revision_id != VMCS12_REVISION) |
| return -EINVAL; |
| |
| if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE)) |
| return 0; |
| |
| vmx->nested.nested_run_pending = |
| !!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING); |
| |
| if (nested_cpu_has_shadow_vmcs(vmcs12) && |
| vmcs12->vmcs_link_pointer != -1ull) { |
| struct vmcs12 *shadow_vmcs12 = get_shadow_vmcs12(vcpu); |
| if (kvm_state->size < sizeof(kvm_state) + 2 * sizeof(*vmcs12)) |
| return -EINVAL; |
| |
| if (copy_from_user(shadow_vmcs12, |
| user_kvm_nested_state->data + VMCS12_SIZE, |
| sizeof(*vmcs12))) |
| return -EFAULT; |
| |
| if (shadow_vmcs12->hdr.revision_id != VMCS12_REVISION || |
| !shadow_vmcs12->hdr.shadow_vmcs) |
| return -EINVAL; |
| } |
| |
| if (check_vmentry_prereqs(vcpu, vmcs12) || |
| check_vmentry_postreqs(vcpu, vmcs12, &exit_qual)) |
| return -EINVAL; |
| |
| vmx->nested.dirty_vmcs12 = true; |
| ret = nested_vmx_enter_non_root_mode(vcpu, false); |
| if (ret) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static struct kvm_x86_ops vmx_x86_ops __ro_after_init = { |
| .cpu_has_kvm_support = cpu_has_kvm_support, |
| .disabled_by_bios = vmx_disabled_by_bios, |
| .hardware_setup = hardware_setup, |
| .hardware_unsetup = hardware_unsetup, |
| .check_processor_compatibility = vmx_check_processor_compat, |
| .hardware_enable = hardware_enable, |
| .hardware_disable = hardware_disable, |
| .cpu_has_accelerated_tpr = report_flexpriority, |
| .has_emulated_msr = vmx_has_emulated_msr, |
| |
| .vm_init = vmx_vm_init, |
| .vm_alloc = vmx_vm_alloc, |
| .vm_free = vmx_vm_free, |
| |
| .vcpu_create = vmx_create_vcpu, |
| .vcpu_free = vmx_free_vcpu, |
| .vcpu_reset = vmx_vcpu_reset, |
| |
| .prepare_guest_switch = vmx_prepare_switch_to_guest, |
| .vcpu_load = vmx_vcpu_load, |
| .vcpu_put = vmx_vcpu_put, |
| |
| .update_bp_intercept = update_exception_bitmap, |
| .get_msr_feature = vmx_get_msr_feature, |
| .get_msr = vmx_get_msr, |
| .set_msr = vmx_set_msr, |
| .get_segment_base = vmx_get_segment_base, |
| .get_segment = vmx_get_segment, |
| .set_segment = vmx_set_segment, |
| .get_cpl = vmx_get_cpl, |
| .get_cs_db_l_bits = vmx_get_cs_db_l_bits, |
| .decache_cr0_guest_bits = vmx_decache_cr0_guest_bits, |
| .decache_cr3 = vmx_decache_cr3, |
| .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits, |
| .set_cr0 = vmx_set_cr0, |
| .set_cr3 = vmx_set_cr3, |
| .set_cr4 = vmx_set_cr4, |
| .set_efer = vmx_set_efer, |
| .get_idt = vmx_get_idt, |
| .set_idt = vmx_set_idt, |
| .get_gdt = vmx_get_gdt, |
| .set_gdt = vmx_set_gdt, |
| .get_dr6 = vmx_get_dr6, |
| .set_dr6 = vmx_set_dr6, |
| .set_dr7 = vmx_set_dr7, |
| .sync_dirty_debug_regs = vmx_sync_dirty_debug_regs, |
| .cache_reg = vmx_cache_reg, |
| .get_rflags = vmx_get_rflags, |
| .set_rflags = vmx_set_rflags, |
| |
| .tlb_flush = vmx_flush_tlb, |
| .tlb_flush_gva = vmx_flush_tlb_gva, |
| |
| .run = vmx_vcpu_run, |
| .handle_exit = vmx_handle_exit, |
| .skip_emulated_instruction = skip_emulated_instruction, |
| .set_interrupt_shadow = vmx_set_interrupt_shadow, |
| .get_interrupt_shadow = vmx_get_interrupt_shadow, |
| .patch_hypercall = vmx_patch_hypercall, |
| .set_irq = vmx_inject_irq, |
| .set_nmi = vmx_inject_nmi, |
| .queue_exception = vmx_queue_exception, |
| .cancel_injection = vmx_cancel_injection, |
| .interrupt_allowed = vmx_interrupt_allowed, |
| .nmi_allowed = vmx_nmi_allowed, |
| .get_nmi_mask = vmx_get_nmi_mask, |
| .set_nmi_mask = vmx_set_nmi_mask, |
| .enable_nmi_window = enable_nmi_window, |
| .enable_irq_window = enable_irq_window, |
| .update_cr8_intercept = update_cr8_intercept, |
| .set_virtual_apic_mode = vmx_set_virtual_apic_mode, |
| .set_apic_access_page_addr = vmx_set_apic_access_page_addr, |
| .get_enable_apicv = vmx_get_enable_apicv, |
| .refresh_apicv_exec_ctrl = vmx_refresh_apicv_exec_ctrl, |
| .load_eoi_exitmap = vmx_load_eoi_exitmap, |
| .apicv_post_state_restore = vmx_apicv_post_state_restore, |
| .hwapic_irr_update = vmx_hwapic_irr_update, |
| .hwapic_isr_update = vmx_hwapic_isr_update, |
| .guest_apic_has_interrupt = vmx_guest_apic_has_interrupt, |
| .sync_pir_to_irr = vmx_sync_pir_to_irr, |
| .deliver_posted_interrupt = vmx_deliver_posted_interrupt, |
| |
| .set_tss_addr = vmx_set_tss_addr, |
| .set_identity_map_addr = vmx_set_identity_map_addr, |
| .get_tdp_level = get_ept_level, |
| .get_mt_mask = vmx_get_mt_mask, |
| |
| .get_exit_info = vmx_get_exit_info, |
| |
| .get_lpage_level = vmx_get_lpage_level, |
| |
| .cpuid_update = vmx_cpuid_update, |
| |
| .rdtscp_supported = vmx_rdtscp_supported, |
| .invpcid_supported = vmx_invpcid_supported, |
| |
| .set_supported_cpuid = vmx_set_supported_cpuid, |
| |
| .has_wbinvd_exit = cpu_has_vmx_wbinvd_exit, |
| |
| .read_l1_tsc_offset = vmx_read_l1_tsc_offset, |
| .write_tsc_offset = vmx_write_tsc_offset, |
| |
| .set_tdp_cr3 = vmx_set_cr3, |
| |
| .check_intercept = vmx_check_intercept, |
| .handle_external_intr = vmx_handle_external_intr, |
| .mpx_supported = vmx_mpx_supported, |
| .xsaves_supported = vmx_xsaves_supported, |
| .umip_emulated = vmx_umip_emulated, |
| |
| .check_nested_events = vmx_check_nested_events, |
| .request_immediate_exit = vmx_request_immediate_exit, |
| |
| .sched_in = vmx_sched_in, |
| |
| .slot_enable_log_dirty = vmx_slot_enable_log_dirty, |
| .slot_disable_log_dirty = vmx_slot_disable_log_dirty, |
| .flush_log_dirty = vmx_flush_log_dirty, |
| .enable_log_dirty_pt_masked = vmx_enable_log_dirty_pt_masked, |
| .write_log_dirty = vmx_write_pml_buffer, |
| |
| .pre_block = vmx_pre_block, |
| .post_block = vmx_post_block, |
| |
| .pmu_ops = &intel_pmu_ops, |
| |
| .update_pi_irte = vmx_update_pi_irte, |
| |
| #ifdef CONFIG_X86_64 |
| .set_hv_timer = vmx_set_hv_timer, |
| .cancel_hv_timer = vmx_cancel_hv_timer, |
| #endif |
| |
| .setup_mce = vmx_setup_mce, |
| |
| .get_nested_state = vmx_get_nested_state, |
| .set_nested_state = vmx_set_nested_state, |
| .get_vmcs12_pages = nested_get_vmcs12_pages, |
| |
| .smi_allowed = vmx_smi_allowed, |
| .pre_enter_smm = vmx_pre_enter_smm, |
| .pre_leave_smm = vmx_pre_leave_smm, |
| .enable_smi_window = enable_smi_window, |
| }; |
| |
| static void vmx_cleanup_l1d_flush(void) |
| { |
| if (vmx_l1d_flush_pages) { |
| free_pages((unsigned long)vmx_l1d_flush_pages, L1D_CACHE_ORDER); |
| vmx_l1d_flush_pages = NULL; |
| } |
| /* Restore state so sysfs ignores VMX */ |
| l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_AUTO; |
| } |
| |
| static void vmx_exit(void) |
| { |
| #ifdef CONFIG_KEXEC_CORE |
| RCU_INIT_POINTER(crash_vmclear_loaded_vmcss, NULL); |
| synchronize_rcu(); |
| #endif |
| |
| kvm_exit(); |
| |
| #if IS_ENABLED(CONFIG_HYPERV) |
| if (static_branch_unlikely(&enable_evmcs)) { |
| int cpu; |
| struct hv_vp_assist_page *vp_ap; |
| /* |
| * Reset everything to support using non-enlightened VMCS |
| * access later (e.g. when we reload the module with |
| * enlightened_vmcs=0) |
| */ |
| for_each_online_cpu(cpu) { |
| vp_ap = hv_get_vp_assist_page(cpu); |
| |
| if (!vp_ap) |
| continue; |
| |
| vp_ap->current_nested_vmcs = 0; |
| vp_ap->enlighten_vmentry = 0; |
| } |
| |
| static_branch_disable(&enable_evmcs); |
| } |
| #endif |
| vmx_cleanup_l1d_flush(); |
| } |
| module_exit(vmx_exit); |
| |
| static int __init vmx_init(void) |
| { |
| int r; |
| |
| #if IS_ENABLED(CONFIG_HYPERV) |
| /* |
| * Enlightened VMCS usage should be recommended and the host needs |
| * to support eVMCS v1 or above. We can also disable eVMCS support |
| * with module parameter. |
| */ |
| if (enlightened_vmcs && |
| ms_hyperv.hints & HV_X64_ENLIGHTENED_VMCS_RECOMMENDED && |
| (ms_hyperv.nested_features & HV_X64_ENLIGHTENED_VMCS_VERSION) >= |
| KVM_EVMCS_VERSION) { |
| int cpu; |
| |
| /* Check that we have assist pages on all online CPUs */ |
| for_each_online_cpu(cpu) { |
| if (!hv_get_vp_assist_page(cpu)) { |
| enlightened_vmcs = false; |
| break; |
| } |
| } |
| |
| if (enlightened_vmcs) { |
| pr_info("KVM: vmx: using Hyper-V Enlightened VMCS\n"); |
| static_branch_enable(&enable_evmcs); |
| } |
| } else { |
| enlightened_vmcs = false; |
| } |
| #endif |
| |
| r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), |
| __alignof__(struct vcpu_vmx), THIS_MODULE); |
| if (r) |
| return r; |
| |
| /* |
| * Must be called after kvm_init() so enable_ept is properly set |
| * up. Hand the parameter mitigation value in which was stored in |
| * the pre module init parser. If no parameter was given, it will |
| * contain 'auto' which will be turned into the default 'cond' |
| * mitigation mode. |
| */ |
| if (boot_cpu_has(X86_BUG_L1TF)) { |
| r = vmx_setup_l1d_flush(vmentry_l1d_flush_param); |
| if (r) { |
| vmx_exit(); |
| return r; |
| } |
| } |
| |
| #ifdef CONFIG_KEXEC_CORE |
| rcu_assign_pointer(crash_vmclear_loaded_vmcss, |
| crash_vmclear_local_loaded_vmcss); |
| #endif |
| vmx_check_vmcs12_offsets(); |
| |
| return 0; |
| } |
| module_init(vmx_init); |