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KVM: x86/cpuid: Refactor host/guest CPU model consistency check

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For the same purpose, the leagcy intel_pmu_lbr_is_compatible() can be
renamed for reuse by more callers, and remove the comment about LBR
use case can be deleted by the way.

Signed-off-by: Like Xu <like.xu@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Message-Id: <20220411101946.20262-17-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Like Xu 2022-04-11 18:19:45 +08:00 • committed by Paolo Bonzini
parent 968635abd5
commit 59cc99f6e9
4 changed files with 7 additions and 13 deletions
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5
arch/x86/kvm/cpuid.h
View file

@ -145,6 +145,11 @@ static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
return x86_model(best->eax);
}
static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu)
{
return boot_cpu_data.x86_model == guest_cpuid_model(vcpu);
}
static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *best;

12
arch/x86/kvm/vmx/pmu_intel.c
View file

@ -167,16 +167,6 @@ static inline struct kvm_pmc *get_fw_gp_pmc(struct kvm_pmu *pmu, u32 msr)
return get_gp_pmc(pmu, msr, MSR_IA32_PMC0);
}
bool intel_pmu_lbr_is_compatible(struct kvm_vcpu *vcpu)
{
/*
* As a first step, a guest could only enable LBR feature if its
* cpu model is the same as the host because the LBR registers
* would be pass-through to the guest and they're model specific.
*/
return boot_cpu_data.x86_model == guest_cpuid_model(vcpu);
}
bool intel_pmu_lbr_is_enabled(struct kvm_vcpu *vcpu)
{
struct x86_pmu_lbr *lbr = vcpu_to_lbr_records(vcpu);
@ -595,7 +585,7 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
nested_vmx_pmu_refresh(vcpu,
intel_is_valid_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL));
if (intel_pmu_lbr_is_compatible(vcpu))
if (cpuid_model_is_consistent(vcpu))
x86_perf_get_lbr(&lbr_desc->records);
else
lbr_desc->records.nr = 0;

2
arch/x86/kvm/vmx/vmx.c
View file

@ -2242,7 +2242,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if ((data & PMU_CAP_LBR_FMT) !=
(vmx_get_perf_capabilities() & PMU_CAP_LBR_FMT))
return 1;
if (!intel_pmu_lbr_is_compatible(vcpu))
if (!cpuid_model_is_consistent(vcpu))
return 1;
}
ret = kvm_set_msr_common(vcpu, msr_info);

1
arch/x86/kvm/vmx/vmx.h
View file

@ -95,7 +95,6 @@ union vmx_exit_reason {
#define vcpu_to_lbr_records(vcpu) (&to_vmx(vcpu)->lbr_desc.records)
void intel_pmu_cross_mapped_check(struct kvm_pmu *pmu);
bool intel_pmu_lbr_is_compatible(struct kvm_vcpu *vcpu);
bool intel_pmu_lbr_is_enabled(struct kvm_vcpu *vcpu);
int intel_pmu_create_guest_lbr_event(struct kvm_vcpu *vcpu);