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KVM: x86: use general helpers for some cpuid manipulation 

Add guest_cpuid_clear() and use it instead of kvm_find_cpuid_entry().
Also replace some uses of kvm_find_cpuid_entry() with guest_cpuid_has().

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
hifive-unleashed-5.1
Radim Krčmář 2017-08-05 00:12:50 +02:00 committed by Paolo Bonzini
parent d6321d4933
commit 1b4d56b86a
4 changed files with 14 additions and 20 deletions
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9
arch/x86/kvm/cpuid.h
View File

@ -104,6 +104,15 @@ static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu, unsigned x86_
return *reg & bit(x86_feature);
}
static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu, unsigned x86_feature)
{
int *reg;
reg = guest_cpuid_get_register(vcpu, x86_feature);
if (reg)
*reg &= ~bit(x86_feature);
}
static inline bool guest_cpuid_is_amd(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *best;

5
arch/x86/kvm/svm.c
View File

@ -5075,7 +5075,6 @@ static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
static void svm_cpuid_update(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct kvm_cpuid_entry2 *entry;
/* Update nrips enabled cache */
svm->nrips_enabled = !!guest_cpuid_has(&svm->vcpu, X86_FEATURE_NRIPS);
@ -5083,9 +5082,7 @@ static void svm_cpuid_update(struct kvm_vcpu *vcpu)
if (!kvm_vcpu_apicv_active(vcpu))
return;
entry = kvm_find_cpuid_entry(vcpu, 1, 0);
if (entry)
entry->ecx &= ~bit(X86_FEATURE_X2APIC);
guest_cpuid_clear(vcpu, X86_FEATURE_X2APIC);
}
static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)

6
arch/x86/kvm/vmx.c
View File

@ -9636,15 +9636,13 @@ static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
if (vmx_invpcid_supported()) {
/* Exposing INVPCID only when PCID is exposed */
struct kvm_cpuid_entry2 *best = kvm_find_cpuid_entry(vcpu, 0x7, 0);
bool invpcid_enabled =
best && best->ebx & bit(X86_FEATURE_INVPCID) &&
guest_cpuid_has(vcpu, X86_FEATURE_INVPCID) &&
guest_cpuid_has(vcpu, X86_FEATURE_PCID);
if (!invpcid_enabled) {
secondary_exec_ctl &= ~SECONDARY_EXEC_ENABLE_INVPCID;
if (best)
best->ebx &= ~bit(X86_FEATURE_INVPCID);
guest_cpuid_clear(vcpu, X86_FEATURE_INVPCID);
}
if (nested) {

14
arch/x86/kvm/x86.c
View File

@ -1022,21 +1022,11 @@ bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer)
if (efer & efer_reserved_bits)
return false;
if (efer & EFER_FFXSR) {
struct kvm_cpuid_entry2 *feat;
feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT)))
if (efer & EFER_FFXSR && !guest_cpuid_has(vcpu, X86_FEATURE_FXSR_OPT))
return false;
}
if (efer & EFER_SVME) {
struct kvm_cpuid_entry2 *feat;
feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM)))
if (efer & EFER_SVME && !guest_cpuid_has(vcpu, X86_FEATURE_SVM))
return false;
}
return true;
}