diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2021-02-02 17:32:35 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-21 16:16:21 +0300 |
| commit | 441726394efacea93235ed7685aebcabd1eb6561 (patch) | |
| tree | 8e520fcd66989081f9809851231cb9a9d291ae01 /arch | |
| parent | a7d0b21c6b406e441fffbe4239c36ce83447fc52 (diff) | |
| download | linux-441726394efacea93235ed7685aebcabd1eb6561.tar.xz | |
KVM: x86/pmu: preserve IA32_PERF_CAPABILITIES across CPUID refresh
[ Upstream commit a755753903a40d982f6dd23d65eb96b248a2577a ]
Once MSR_IA32_PERF_CAPABILITIES is changed via vmx_set_msr(), the
value should not be changed by cpuid(). To ensure that the new value
is kept, the default initialization path is moved to intel_pmu_init().
The effective value of the MSR will be 0 if PDCM is clear, however.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/vmx/pmu_intel.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c index bd70c1d7f345..b3ca19682975 100644 --- a/arch/x86/kvm/vmx/pmu_intel.c +++ b/arch/x86/kvm/vmx/pmu_intel.c @@ -153,12 +153,17 @@ static struct kvm_pmc *intel_rdpmc_ecx_to_pmc(struct kvm_vcpu *vcpu, return &counters[array_index_nospec(idx, num_counters)]; } -static inline bool fw_writes_is_enabled(struct kvm_vcpu *vcpu) +static inline u64 vcpu_get_perf_capabilities(struct kvm_vcpu *vcpu) { if (!guest_cpuid_has(vcpu, X86_FEATURE_PDCM)) - return false; + return 0; - return vcpu->arch.perf_capabilities & PMU_CAP_FW_WRITES; + return vcpu->arch.perf_capabilities; +} + +static inline bool fw_writes_is_enabled(struct kvm_vcpu *vcpu) +{ + return (vcpu_get_perf_capabilities(vcpu) & PMU_CAP_FW_WRITES) != 0; } static inline struct kvm_pmc *get_fw_gp_pmc(struct kvm_pmu *pmu, u32 msr) @@ -328,7 +333,6 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu) pmu->counter_bitmask[KVM_PMC_FIXED] = 0; pmu->version = 0; pmu->reserved_bits = 0xffffffff00200000ull; - vcpu->arch.perf_capabilities = 0; entry = kvm_find_cpuid_entry(vcpu, 0xa, 0); if (!entry) @@ -341,8 +345,6 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu) return; perf_get_x86_pmu_capability(&x86_pmu); - if (guest_cpuid_has(vcpu, X86_FEATURE_PDCM)) - vcpu->arch.perf_capabilities = vmx_get_perf_capabilities(); pmu->nr_arch_gp_counters = min_t(int, eax.split.num_counters, x86_pmu.num_counters_gp); @@ -406,6 +408,8 @@ static void intel_pmu_init(struct kvm_vcpu *vcpu) pmu->fixed_counters[i].idx = i + INTEL_PMC_IDX_FIXED; pmu->fixed_counters[i].current_config = 0; } + + vcpu->arch.perf_capabilities = vmx_get_perf_capabilities(); } static void intel_pmu_reset(struct kvm_vcpu *vcpu) |