KVM: nVMX: additional checks on vmxon region
Currently, the vmxon region isn't used in the nested case.
However, according to the spec, the vmxon instruction performs
additional sanity checks on this region and the associated
pointer. Modify emulated vmxon to better adhere to the spec
requirements
Signed-off-by: Bandan Das <bsd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 917a15e..0f79347 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -354,6 +354,7 @@
struct nested_vmx {
/* Has the level1 guest done vmxon? */
bool vmxon;
+ gpa_t vmxon_ptr;
/* The guest-physical address of the current VMCS L1 keeps for L2 */
gpa_t current_vmptr;
@@ -5845,6 +5846,68 @@
}
/*
+ * This function performs the various checks including
+ * - if it's 4KB aligned
+ * - No bits beyond the physical address width are set
+ * - Returns 0 on success or else 1
+ */
+static int nested_vmx_check_vmptr(struct kvm_vcpu *vcpu, int exit_reason)
+{
+ gva_t gva;
+ gpa_t vmptr;
+ struct x86_exception e;
+ struct page *page;
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ int maxphyaddr = cpuid_maxphyaddr(vcpu);
+
+ if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
+ vmcs_read32(VMX_INSTRUCTION_INFO), &gva))
+ return 1;
+
+ if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &vmptr,
+ sizeof(vmptr), &e)) {
+ kvm_inject_page_fault(vcpu, &e);
+ return 1;
+ }
+
+ switch (exit_reason) {
+ case EXIT_REASON_VMON:
+ /*
+ * 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 (!IS_ALIGNED(vmptr, PAGE_SIZE) || (vmptr >> maxphyaddr)) {
+ nested_vmx_failInvalid(vcpu);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ }
+
+ page = nested_get_page(vcpu, vmptr);
+ if (page == NULL ||
+ *(u32 *)kmap(page) != VMCS12_REVISION) {
+ nested_vmx_failInvalid(vcpu);
+ kunmap(page);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ }
+ kunmap(page);
+ vmx->nested.vmxon_ptr = vmptr;
+ break;
+
+ default:
+ return 1; /* shouldn't happen */
+ }
+
+ return 0;
+}
+
+/*
* 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
@@ -5882,6 +5945,10 @@
kvm_inject_gp(vcpu, 0);
return 1;
}
+
+ if (nested_vmx_check_vmptr(vcpu, EXIT_REASON_VMON))
+ return 1;
+
if (vmx->nested.vmxon) {
nested_vmx_failValid(vcpu, VMXERR_VMXON_IN_VMX_ROOT_OPERATION);
skip_emulated_instruction(vcpu);