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| author | Like Xu <likexu@tencent.com> | 2022-04-11 12:19:44 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-06-08 10:48:16 +0200 |
| commit | 968635abd5f5986f3cb6f15602d365cf1b551c5d (patch) | |
| tree | adef023fd2e68efe0e593c1a55e8f61aad158471 /arch/x86/kvm/pmu.h | |
| parent | KVM: x86/pmu: Disable guest PEBS temporarily in two rare situations (diff) | |
| download | linux-968635abd5f5986f3cb6f15602d365cf1b551c5d.tar.xz linux-968635abd5f5986f3cb6f15602d365cf1b551c5d.zip | |
KVM: x86/pmu: Add kvm_pmu_cap to optimize perf_get_x86_pmu_capability
The information obtained from the interface perf_get_x86_pmu_capability()
doesn't change, so an exported "struct x86_pmu_capability" is introduced
for all guests in the KVM, and it's initialized before hardware_setup().
Signed-off-by: Like Xu <likexu@tencent.com>
Message-Id: <20220411101946.20262-16-likexu@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/pmu.h')
| -rw-r--r-- | arch/x86/kvm/pmu.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h index d01c883ca95c..9e25cdd2bd1a 100644 --- a/arch/x86/kvm/pmu.h +++ b/arch/x86/kvm/pmu.h @@ -163,6 +163,24 @@ static inline bool pmc_speculative_in_use(struct kvm_pmc *pmc) return pmc->eventsel & ARCH_PERFMON_EVENTSEL_ENABLE; } +extern struct x86_pmu_capability kvm_pmu_cap; + +static inline void kvm_init_pmu_capability(void) +{ + perf_get_x86_pmu_capability(&kvm_pmu_cap); + + /* + * Only support guest architectural pmu on + * a host with architectural pmu. + */ + if (!kvm_pmu_cap.version) + memset(&kvm_pmu_cap, 0, sizeof(kvm_pmu_cap)); + + kvm_pmu_cap.version = min(kvm_pmu_cap.version, 2); + kvm_pmu_cap.num_counters_fixed = min(kvm_pmu_cap.num_counters_fixed, + KVM_PMC_MAX_FIXED); +} + void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel); void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int fixed_idx); void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx); @@ -181,6 +199,7 @@ void kvm_pmu_cleanup(struct kvm_vcpu *vcpu); void kvm_pmu_destroy(struct kvm_vcpu *vcpu); int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp); void kvm_pmu_trigger_event(struct kvm_vcpu *vcpu, u64 perf_hw_id); +void kvm_init_pmu_capability(void); bool is_vmware_backdoor_pmc(u32 pmc_idx); |