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KVM: x86: Add a helper to query whether or not a vCPU has ever run

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Add a helper to query if a vCPU has run so that KVM doesn't have to open
code the check on last_vmentry_cpu being set to a magic value.

No functional change intended.

Suggested-by: Xiaoyao Li <xiaoyao.li@intel.com>
Cc: Like Xu <like.xu.linux@gmail.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20230311004618.920745-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2023-03-10 16:45:59 -08:00
parent b1932c5c19
commit fb3146b4dc
3 changed files with 7 additions and 2 deletions
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2
arch/x86/kvm/cpuid.c
View File

@@ -420,7 +420,7 @@ static int kvm_set_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid_entry2 *e2,
* KVM_SET_CPUID{,2} again. To support this legacy behavior, check
* whether the supplied CPUID data is equal to what's already set.
*/
if (vcpu->arch.last_vmentry_cpu != -1) {
if (kvm_vcpu_has_run(vcpu)) {
r = kvm_cpuid_check_equal(vcpu, e2, nent);
if (r)
return r;

2
arch/x86/kvm/mmu/mmu.c
View File

@@ -5393,7 +5393,7 @@ void kvm_mmu_after_set_cpuid(struct kvm_vcpu *vcpu)
* Changing guest CPUID after KVM_RUN is forbidden, see the comment in
* kvm_arch_vcpu_ioctl().
*/
KVM_BUG_ON(vcpu->arch.last_vmentry_cpu != -1, vcpu->kvm);
KVM_BUG_ON(kvm_vcpu_has_run(vcpu), vcpu->kvm);
}
void kvm_mmu_reset_context(struct kvm_vcpu *vcpu)

5
arch/x86/kvm/x86.h
View File

@@ -83,6 +83,11 @@ static inline unsigned int __shrink_ple_window(unsigned int val,
void kvm_service_local_tlb_flush_requests(struct kvm_vcpu *vcpu);
int kvm_check_nested_events(struct kvm_vcpu *vcpu);
static inline bool kvm_vcpu_has_run(struct kvm_vcpu *vcpu)
{
return vcpu->arch.last_vmentry_cpu != -1;
}
static inline bool kvm_is_exception_pending(struct kvm_vcpu *vcpu)
{
return vcpu->arch.exception.pending ||