diff options
Diffstat (limited to 'arch/x86/kvm/pmu.h')
| -rw-r--r-- | arch/x86/kvm/pmu.h | 142 |
1 files changed, 54 insertions, 88 deletions
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h index 7d9ba301c090..5c3939e91f1d 100644 --- a/arch/x86/kvm/pmu.h +++ b/arch/x86/kvm/pmu.h @@ -4,6 +4,8 @@ #include <linux/nospec.h> +#include <asm/kvm_host.h> + #define vcpu_to_pmu(vcpu) (&(vcpu)->arch.pmu) #define pmu_to_vcpu(pmu) (container_of((pmu), struct kvm_vcpu, arch.pmu)) #define pmc_to_pmu(pmc) (&(pmc)->vcpu->arch.pmu) @@ -11,20 +13,21 @@ #define MSR_IA32_MISC_ENABLE_PMU_RO_MASK (MSR_IA32_MISC_ENABLE_PEBS_UNAVAIL | \ MSR_IA32_MISC_ENABLE_BTS_UNAVAIL) -/* retrieve the 4 bits for EN and PMI out of IA32_FIXED_CTR_CTRL */ -#define fixed_ctrl_field(ctrl_reg, idx) (((ctrl_reg) >> ((idx)*4)) & 0xf) +/* retrieve a fixed counter bits out of IA32_FIXED_CTR_CTRL */ +#define fixed_ctrl_field(ctrl_reg, idx) \ + (((ctrl_reg) >> ((idx) * INTEL_FIXED_BITS_STRIDE)) & INTEL_FIXED_BITS_MASK) #define VMWARE_BACKDOOR_PMC_HOST_TSC 0x10000 #define VMWARE_BACKDOOR_PMC_REAL_TIME 0x10001 #define VMWARE_BACKDOOR_PMC_APPARENT_TIME 0x10002 +#define KVM_FIXED_PMC_BASE_IDX INTEL_PMC_IDX_FIXED + struct kvm_pmu_ops { - bool (*hw_event_available)(struct kvm_pmc *pmc); - struct kvm_pmc *(*pmc_idx_to_pmc)(struct kvm_pmu *pmu, int pmc_idx); struct kvm_pmc *(*rdpmc_ecx_to_pmc)(struct kvm_vcpu *vcpu, unsigned int idx, u64 *mask); struct kvm_pmc *(*msr_idx_to_pmc)(struct kvm_vcpu *vcpu, u32 msr); - bool (*is_valid_rdpmc_ecx)(struct kvm_vcpu *vcpu, unsigned int idx); + int (*check_rdpmc_early)(struct kvm_vcpu *vcpu, unsigned int idx); bool (*is_valid_msr)(struct kvm_vcpu *vcpu, u32 msr); int (*get_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr_info); int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr_info); @@ -55,6 +58,38 @@ static inline bool kvm_pmu_has_perf_global_ctrl(struct kvm_pmu *pmu) return pmu->version > 1; } +/* + * KVM tracks all counters in 64-bit bitmaps, with general purpose counters + * mapped to bits 31:0 and fixed counters mapped to 63:32, e.g. fixed counter 0 + * is tracked internally via index 32. On Intel, (AMD doesn't support fixed + * counters), this mirrors how fixed counters are mapped to PERF_GLOBAL_CTRL + * and similar MSRs, i.e. tracking fixed counters at base index 32 reduces the + * amounter of boilerplate needed to iterate over PMCs *and* simplifies common + * enabling/disable/reset operations. + * + * WARNING! This helper is only for lookups that are initiated by KVM, it is + * NOT safe for guest lookups, e.g. will do the wrong thing if passed a raw + * ECX value from RDPMC (fixed counters are accessed by setting bit 30 in ECX + * for RDPMC, not by adding 32 to the fixed counter index). + */ +static inline struct kvm_pmc *kvm_pmc_idx_to_pmc(struct kvm_pmu *pmu, int idx) +{ + if (idx < pmu->nr_arch_gp_counters) + return &pmu->gp_counters[idx]; + + idx -= KVM_FIXED_PMC_BASE_IDX; + if (idx >= 0 && idx < pmu->nr_arch_fixed_counters) + return &pmu->fixed_counters[idx]; + + return NULL; +} + +#define kvm_for_each_pmc(pmu, pmc, i, bitmap) \ + for_each_set_bit(i, bitmap, X86_PMC_IDX_MAX) \ + if (!(pmc = kvm_pmc_idx_to_pmc(pmu, i))) \ + continue; \ + else \ + static inline u64 pmc_bitmask(struct kvm_pmc *pmc) { struct kvm_pmu *pmu = pmc_to_pmu(pmc); @@ -66,7 +101,8 @@ static inline u64 pmc_read_counter(struct kvm_pmc *pmc) { u64 counter, enabled, running; - counter = pmc->counter; + counter = pmc->counter + pmc->emulated_counter; + if (pmc->perf_event && !pmc->is_paused) counter += perf_event_read_value(pmc->perf_event, &enabled, &running); @@ -74,23 +110,7 @@ static inline u64 pmc_read_counter(struct kvm_pmc *pmc) return counter & pmc_bitmask(pmc); } -static inline void pmc_release_perf_event(struct kvm_pmc *pmc) -{ - if (pmc->perf_event) { - perf_event_release_kernel(pmc->perf_event); - pmc->perf_event = NULL; - pmc->current_config = 0; - pmc_to_pmu(pmc)->event_count--; - } -} - -static inline void pmc_stop_counter(struct kvm_pmc *pmc) -{ - if (pmc->perf_event) { - pmc->counter = pmc_read_counter(pmc); - pmc_release_perf_event(pmc); - } -} +void pmc_write_counter(struct kvm_pmc *pmc, u64 val); static inline bool pmc_is_gp(struct kvm_pmc *pmc) { @@ -105,7 +125,7 @@ static inline bool pmc_is_fixed(struct kvm_pmc *pmc) static inline bool kvm_valid_perf_global_ctrl(struct kvm_pmu *pmu, u64 data) { - return !(pmu->global_ctrl_mask & data); + return !(pmu->global_ctrl_rsvd & data); } /* returns general purpose PMC with the specified MSR. Note that it can be @@ -140,82 +160,28 @@ static inline struct kvm_pmc *get_fixed_pmc(struct kvm_pmu *pmu, u32 msr) return NULL; } -static inline u64 get_sample_period(struct kvm_pmc *pmc, u64 counter_value) -{ - u64 sample_period = (-counter_value) & pmc_bitmask(pmc); - - if (!sample_period) - sample_period = pmc_bitmask(pmc) + 1; - return sample_period; -} - -static inline void pmc_update_sample_period(struct kvm_pmc *pmc) -{ - if (!pmc->perf_event || pmc->is_paused || - !is_sampling_event(pmc->perf_event)) - return; - - perf_event_period(pmc->perf_event, - get_sample_period(pmc, pmc->counter)); -} - -static inline bool pmc_speculative_in_use(struct kvm_pmc *pmc) +static inline bool pmc_is_locally_enabled(struct kvm_pmc *pmc) { struct kvm_pmu *pmu = pmc_to_pmu(pmc); if (pmc_is_fixed(pmc)) return fixed_ctrl_field(pmu->fixed_ctr_ctrl, - pmc->idx - INTEL_PMC_IDX_FIXED) & 0x3; + pmc->idx - KVM_FIXED_PMC_BASE_IDX) & + (INTEL_FIXED_0_KERNEL | INTEL_FIXED_0_USER); return pmc->eventsel & ARCH_PERFMON_EVENTSEL_ENABLE; } extern struct x86_pmu_capability kvm_pmu_cap; -static inline void kvm_init_pmu_capability(const struct kvm_pmu_ops *pmu_ops) -{ - bool is_intel = boot_cpu_data.x86_vendor == X86_VENDOR_INTEL; - int min_nr_gp_ctrs = pmu_ops->MIN_NR_GP_COUNTERS; +void kvm_init_pmu_capability(const struct kvm_pmu_ops *pmu_ops); - /* - * Hybrid PMUs don't play nice with virtualization without careful - * configuration by userspace, and KVM's APIs for reporting supported - * vPMU features do not account for hybrid PMUs. Disable vPMU support - * for hybrid PMUs until KVM gains a way to let userspace opt-in. - */ - if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU)) - enable_pmu = false; - - if (enable_pmu) { - perf_get_x86_pmu_capability(&kvm_pmu_cap); - - /* - * WARN if perf did NOT disable hardware PMU if the number of - * architecturally required GP counters aren't present, i.e. if - * there are a non-zero number of counters, but fewer than what - * is architecturally required. - */ - if (!kvm_pmu_cap.num_counters_gp || - WARN_ON_ONCE(kvm_pmu_cap.num_counters_gp < min_nr_gp_ctrs)) - enable_pmu = false; - else if (is_intel && !kvm_pmu_cap.version) - enable_pmu = false; - } - - if (!enable_pmu) { - memset(&kvm_pmu_cap, 0, sizeof(kvm_pmu_cap)); - return; - } - - kvm_pmu_cap.version = min(kvm_pmu_cap.version, 2); - kvm_pmu_cap.num_counters_gp = min(kvm_pmu_cap.num_counters_gp, - pmu_ops->MAX_NR_GP_COUNTERS); - kvm_pmu_cap.num_counters_fixed = min(kvm_pmu_cap.num_counters_fixed, - KVM_PMC_MAX_FIXED); -} +void kvm_pmu_recalc_pmc_emulation(struct kvm_pmu *pmu, struct kvm_pmc *pmc); static inline void kvm_pmu_request_counter_reprogram(struct kvm_pmc *pmc) { + kvm_pmu_recalc_pmc_emulation(pmc_to_pmu(pmc), pmc); + set_bit(pmc->idx, pmc_to_pmu(pmc)->reprogram_pmi); kvm_make_request(KVM_REQ_PMU, pmc->vcpu); } @@ -250,17 +216,17 @@ static inline bool pmc_is_globally_enabled(struct kvm_pmc *pmc) void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu); void kvm_pmu_handle_event(struct kvm_vcpu *vcpu); int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data); -bool kvm_pmu_is_valid_rdpmc_ecx(struct kvm_vcpu *vcpu, unsigned int idx); +int kvm_pmu_check_rdpmc_early(struct kvm_vcpu *vcpu, unsigned int idx); bool kvm_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr); int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info); int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info); void kvm_pmu_refresh(struct kvm_vcpu *vcpu); -void kvm_pmu_reset(struct kvm_vcpu *vcpu); void kvm_pmu_init(struct kvm_vcpu *vcpu); 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_pmu_instruction_retired(struct kvm_vcpu *vcpu); +void kvm_pmu_branch_retired(struct kvm_vcpu *vcpu); bool is_vmware_backdoor_pmc(u32 pmc_idx); |