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KVM: x86: Add a return value to kvm_emulate_cpuid

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Once skipping the emulated instruction can potentially trigger an exit to
userspace (via KVM_GUESTDBG_SINGLESTEP) kvm_emulate_cpuid will need to
propagate a return value.

Signed-off-by: Kyle Huey <khuey@kylehuey.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Kyle Huey 2016-11-29 12:40:37 -08:00 committed by Paolo Bonzini
parent 57d1da871b
commit 6a908b628c
4 changed files with 5 additions and 6 deletions
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2
arch/x86/include/asm/kvm_host.h
View File

@ -1134,7 +1134,7 @@ struct x86_emulate_ctxt;
int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port);
int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size, unsigned short port);
void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
int kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
int kvm_emulate_halt(struct kvm_vcpu *vcpu);
int kvm_vcpu_halt(struct kvm_vcpu *vcpu);
int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu);

3
arch/x86/kvm/cpuid.c
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@ -879,7 +879,7 @@ void kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
}
EXPORT_SYMBOL_GPL(kvm_cpuid);
void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
int kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
{
u32 eax, ebx, ecx, edx;
@ -891,5 +891,6 @@ void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
kvm_register_write(vcpu, VCPU_REGS_RCX, ecx);
kvm_register_write(vcpu, VCPU_REGS_RDX, edx);
kvm_x86_ops->skip_emulated_instruction(vcpu);
return 1;
}
EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);

3
arch/x86/kvm/svm.c
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@ -3239,8 +3239,7 @@ static int task_switch_interception(struct vcpu_svm *svm)
static int cpuid_interception(struct vcpu_svm *svm)
{
svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
kvm_emulate_cpuid(&svm->vcpu);
return 1;
return kvm_emulate_cpuid(&svm->vcpu);
}
static int iret_interception(struct vcpu_svm *svm)

3
arch/x86/kvm/vmx.c
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@ -5837,8 +5837,7 @@ static void vmx_set_dr7(struct kvm_vcpu *vcpu, unsigned long val)
static int handle_cpuid(struct kvm_vcpu *vcpu)
{
kvm_emulate_cpuid(vcpu);
return 1;
return kvm_emulate_cpuid(vcpu);
}
static int handle_rdmsr(struct kvm_vcpu *vcpu)