pmu.h (5115B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __KVM_X86_PMU_H 3#define __KVM_X86_PMU_H 4 5#include <linux/nospec.h> 6 7#define vcpu_to_pmu(vcpu) (&(vcpu)->arch.pmu) 8#define pmu_to_vcpu(pmu) (container_of((pmu), struct kvm_vcpu, arch.pmu)) 9#define pmc_to_pmu(pmc) (&(pmc)->vcpu->arch.pmu) 10 11/* retrieve the 4 bits for EN and PMI out of IA32_FIXED_CTR_CTRL */ 12#define fixed_ctrl_field(ctrl_reg, idx) (((ctrl_reg) >> ((idx)*4)) & 0xf) 13 14#define VMWARE_BACKDOOR_PMC_HOST_TSC 0x10000 15#define VMWARE_BACKDOOR_PMC_REAL_TIME 0x10001 16#define VMWARE_BACKDOOR_PMC_APPARENT_TIME 0x10002 17 18struct kvm_event_hw_type_mapping { 19 u8 eventsel; 20 u8 unit_mask; 21 unsigned event_type; 22}; 23 24struct kvm_pmu_ops { 25 unsigned int (*pmc_perf_hw_id)(struct kvm_pmc *pmc); 26 bool (*pmc_is_enabled)(struct kvm_pmc *pmc); 27 struct kvm_pmc *(*pmc_idx_to_pmc)(struct kvm_pmu *pmu, int pmc_idx); 28 struct kvm_pmc *(*rdpmc_ecx_to_pmc)(struct kvm_vcpu *vcpu, 29 unsigned int idx, u64 *mask); 30 struct kvm_pmc *(*msr_idx_to_pmc)(struct kvm_vcpu *vcpu, u32 msr); 31 bool (*is_valid_rdpmc_ecx)(struct kvm_vcpu *vcpu, unsigned int idx); 32 bool (*is_valid_msr)(struct kvm_vcpu *vcpu, u32 msr); 33 int (*get_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr_info); 34 int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr_info); 35 void (*refresh)(struct kvm_vcpu *vcpu); 36 void (*init)(struct kvm_vcpu *vcpu); 37 void (*reset)(struct kvm_vcpu *vcpu); 38 void (*deliver_pmi)(struct kvm_vcpu *vcpu); 39 void (*cleanup)(struct kvm_vcpu *vcpu); 40}; 41 42void kvm_pmu_ops_update(const struct kvm_pmu_ops *pmu_ops); 43 44static inline u64 pmc_bitmask(struct kvm_pmc *pmc) 45{ 46 struct kvm_pmu *pmu = pmc_to_pmu(pmc); 47 48 return pmu->counter_bitmask[pmc->type]; 49} 50 51static inline u64 pmc_read_counter(struct kvm_pmc *pmc) 52{ 53 u64 counter, enabled, running; 54 55 counter = pmc->counter; 56 if (pmc->perf_event && !pmc->is_paused) 57 counter += perf_event_read_value(pmc->perf_event, 58 &enabled, &running); 59 /* FIXME: Scaling needed? */ 60 return counter & pmc_bitmask(pmc); 61} 62 63static inline void pmc_release_perf_event(struct kvm_pmc *pmc) 64{ 65 if (pmc->perf_event) { 66 perf_event_release_kernel(pmc->perf_event); 67 pmc->perf_event = NULL; 68 pmc->current_config = 0; 69 pmc_to_pmu(pmc)->event_count--; 70 } 71} 72 73static inline void pmc_stop_counter(struct kvm_pmc *pmc) 74{ 75 if (pmc->perf_event) { 76 pmc->counter = pmc_read_counter(pmc); 77 pmc_release_perf_event(pmc); 78 } 79} 80 81static inline bool pmc_is_gp(struct kvm_pmc *pmc) 82{ 83 return pmc->type == KVM_PMC_GP; 84} 85 86static inline bool pmc_is_fixed(struct kvm_pmc *pmc) 87{ 88 return pmc->type == KVM_PMC_FIXED; 89} 90 91static inline bool kvm_valid_perf_global_ctrl(struct kvm_pmu *pmu, 92 u64 data) 93{ 94 return !(pmu->global_ctrl_mask & data); 95} 96 97/* returns general purpose PMC with the specified MSR. Note that it can be 98 * used for both PERFCTRn and EVNTSELn; that is why it accepts base as a 99 * parameter to tell them apart. 100 */ 101static inline struct kvm_pmc *get_gp_pmc(struct kvm_pmu *pmu, u32 msr, 102 u32 base) 103{ 104 if (msr >= base && msr < base + pmu->nr_arch_gp_counters) { 105 u32 index = array_index_nospec(msr - base, 106 pmu->nr_arch_gp_counters); 107 108 return &pmu->gp_counters[index]; 109 } 110 111 return NULL; 112} 113 114/* returns fixed PMC with the specified MSR */ 115static inline struct kvm_pmc *get_fixed_pmc(struct kvm_pmu *pmu, u32 msr) 116{ 117 int base = MSR_CORE_PERF_FIXED_CTR0; 118 119 if (msr >= base && msr < base + pmu->nr_arch_fixed_counters) { 120 u32 index = array_index_nospec(msr - base, 121 pmu->nr_arch_fixed_counters); 122 123 return &pmu->fixed_counters[index]; 124 } 125 126 return NULL; 127} 128 129static inline u64 get_sample_period(struct kvm_pmc *pmc, u64 counter_value) 130{ 131 u64 sample_period = (-counter_value) & pmc_bitmask(pmc); 132 133 if (!sample_period) 134 sample_period = pmc_bitmask(pmc) + 1; 135 return sample_period; 136} 137 138static inline void pmc_update_sample_period(struct kvm_pmc *pmc) 139{ 140 if (!pmc->perf_event || pmc->is_paused) 141 return; 142 143 perf_event_period(pmc->perf_event, 144 get_sample_period(pmc, pmc->counter)); 145} 146 147void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel); 148void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int fixed_idx); 149void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx); 150 151void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu); 152void kvm_pmu_handle_event(struct kvm_vcpu *vcpu); 153int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data); 154bool kvm_pmu_is_valid_rdpmc_ecx(struct kvm_vcpu *vcpu, unsigned int idx); 155bool kvm_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr); 156int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info); 157int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info); 158void kvm_pmu_refresh(struct kvm_vcpu *vcpu); 159void kvm_pmu_reset(struct kvm_vcpu *vcpu); 160void kvm_pmu_init(struct kvm_vcpu *vcpu); 161void kvm_pmu_cleanup(struct kvm_vcpu *vcpu); 162void kvm_pmu_destroy(struct kvm_vcpu *vcpu); 163int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp); 164void kvm_pmu_trigger_event(struct kvm_vcpu *vcpu, u64 perf_hw_id); 165 166bool is_vmware_backdoor_pmc(u32 pmc_idx); 167 168extern struct kvm_pmu_ops intel_pmu_ops; 169extern struct kvm_pmu_ops amd_pmu_ops; 170#endif /* __KVM_X86_PMU_H */