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Code Issues Releases Wiki Activity

KVM: x86: Introduce vcpu->arch.xsaves_enabled

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Cache whether XSAVES is enabled in the guest by adding xsaves_enabled to
vcpu->arch.

Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Change-Id: If4638e0901c28a4494dad2e103e2c075e8ab5d68
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Aaron Lewis 2019-10-21 16:30:20 -07:00 committed by Paolo Bonzini
parent 1b84292bea
commit 7204160eb7
3 changed files with 9 additions and 0 deletions
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1
arch/x86/include/asm/kvm_host.h
View file

@ -560,6 +560,7 @@ struct kvm_vcpu_arch {
u64 smbase;
u64 smi_count;
bool tpr_access_reporting;
bool xsaves_enabled;
u64 ia32_xss;
u64 microcode_version;
u64 arch_capabilities;

3
arch/x86/kvm/svm.c
View file

@ -5895,6 +5895,9 @@ static void svm_cpuid_update(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
vcpu->arch.xsaves_enabled = guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) &&
boot_cpu_has(X86_FEATURE_XSAVES);
/* Update nrips enabled cache */
svm->nrips_enabled = !!guest_cpuid_has(&svm->vcpu, X86_FEATURE_NRIPS);

5
arch/x86/kvm/vmx/vmx.c
View file

@ -4050,6 +4050,8 @@ static void vmx_compute_secondary_exec_control(struct vcpu_vmx *vmx)
guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) &&
guest_cpuid_has(vcpu, X86_FEATURE_XSAVES);
vcpu->arch.xsaves_enabled = xsaves_enabled;
if (!xsaves_enabled)
exec_control &= ~SECONDARY_EXEC_XSAVES;
@ -7089,6 +7091,9 @@ static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
/* xsaves_enabled is recomputed in vmx_compute_secondary_exec_control(). */
vcpu->arch.xsaves_enabled = false;
if (cpu_has_secondary_exec_ctrls()) {
vmx_compute_secondary_exec_control(vmx);
vmcs_set_secondary_exec_control(vmx);