KVM: x86: Move #GP injection for VMware into x86_emulate_instruction()
Immediately inject a #GP when VMware emulation fails and return
EMULATE_DONE instead of propagating EMULATE_FAIL up the stack. This
helps pave the way for removing EMULATE_FAIL altogether.
Rename EMULTYPE_VMWARE to EMULTYPE_VMWARE_GP to document that the x86
emulator is called to handle VMware #GP interception, e.g. why a #GP
is injected on emulation failure for EMULTYPE_VMWARE_GP.
Drop EMULTYPE_NO_UD_ON_FAIL as a standalone type. The "no #UD on fail"
is used only in the VMWare case and is obsoleted by having the emulator
itself reinject #GP.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 13b35f9..80071d0 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1325,8 +1325,7 @@ enum emulation_result {
#define EMULTYPE_TRAP_UD (1 << 1)
#define EMULTYPE_SKIP (1 << 2)
#define EMULTYPE_ALLOW_RETRY (1 << 3)
-#define EMULTYPE_NO_UD_ON_FAIL (1 << 4)
-#define EMULTYPE_VMWARE (1 << 5)
+#define EMULTYPE_VMWARE_GP (1 << 5)
int kvm_emulate_instruction(struct kvm_vcpu *vcpu, int emulation_type);
int kvm_emulate_instruction_from_buffer(struct kvm_vcpu *vcpu,
void *insn, int insn_len);
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 00ec27b..c7aa55e 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2768,7 +2768,6 @@ static int gp_interception(struct vcpu_svm *svm)
{
struct kvm_vcpu *vcpu = &svm->vcpu;
u32 error_code = svm->vmcb->control.exit_info_1;
- int er;
WARN_ON_ONCE(!enable_vmware_backdoor);
@@ -2780,13 +2779,8 @@ static int gp_interception(struct vcpu_svm *svm)
kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
return 1;
}
- 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, 0);
- return 1;
+ return kvm_emulate_instruction(vcpu, EMULTYPE_VMWARE_GP) !=
+ EMULATE_USER_EXIT;
}
static bool is_erratum_383(void)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index d1bac3c..d437159 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4522,7 +4522,6 @@ static int handle_exception_nmi(struct kvm_vcpu *vcpu)
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;
@@ -4549,13 +4548,8 @@ static int handle_exception_nmi(struct kvm_vcpu *vcpu)
kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
return 1;
}
- 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, 0);
- return 1;
+ return kvm_emulate_instruction(vcpu, EMULTYPE_VMWARE_GP) !=
+ EMULATE_USER_EXIT;
}
/*
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e6063f2..09753b6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6307,8 +6307,10 @@ static int handle_emulation_failure(struct kvm_vcpu *vcpu, int emulation_type)
++vcpu->stat.insn_emulation_fail;
trace_kvm_emulate_insn_failed(vcpu);
- if (emulation_type & EMULTYPE_NO_UD_ON_FAIL)
- return EMULATE_FAIL;
+ if (emulation_type & EMULTYPE_VMWARE_GP) {
+ kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
+ return EMULATE_DONE;
+ }
kvm_queue_exception(vcpu, UD_VECTOR);
@@ -6648,9 +6650,11 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu,
}
}
- if ((emulation_type & EMULTYPE_VMWARE) &&
- !is_vmware_backdoor_opcode(ctxt))
- return EMULATE_FAIL;
+ if ((emulation_type & EMULTYPE_VMWARE_GP) &&
+ !is_vmware_backdoor_opcode(ctxt)) {
+ kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
+ return EMULATE_DONE;
+ }
if (emulation_type & EMULTYPE_SKIP) {
kvm_rip_write(vcpu, ctxt->_eip);