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 18 struct kvm_event_hw_type_mapping { 19 u8 eventsel; 20 u8 unit_mask; 21 unsigned event_type; 22 }; 23 24 struct 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, bool host_initiated); 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 42 void kvm_pmu_ops_update(const struct kvm_pmu_ops *pmu_ops); 43 44 static 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 51 static 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 63 static 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 73 static 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 81 static inline bool pmc_is_gp(struct kvm_pmc *pmc) 82 { 83 return pmc->type == KVM_PMC_GP; 84 } 85 86 static inline bool pmc_is_fixed(struct kvm_pmc *pmc) 87 { 88 return pmc->type == KVM_PMC_FIXED; 89 } 90 91 static 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 */ 101 static 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 */ 115 static 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 } 128 129 static 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 } 137 138 static 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 } 146 147 static inline bool pmc_speculative_in_use(struct kvm_pmc *pmc) 148 { 149 struct kvm_pmu *pmu = pmc_to_pmu(pmc); 150 151 if (pmc_is_fixed(pmc)) 152 return fixed_ctrl_field(pmu->fixed_ctr_ctrl, 153 pmc->idx - INTEL_PMC_IDX_FIXED) & 0x3; 154 155 return pmc->eventsel & ARCH_PERFMON_EVENTSEL_ENABLE; 156 } 157 158 extern struct x86_pmu_capability kvm_pmu_cap; 159 160 static inline void kvm_init_pmu_capability(void) 161 { 162 perf_get_x86_pmu_capability(&kvm_pmu_cap); 163 164 /* 165 * Only support guest architectural pmu on 166 * a host with architectural pmu. 167 */ 168 if (!kvm_pmu_cap.version) 169 memset(&kvm_pmu_cap, 0, sizeof(kvm_pmu_cap)); 170 171 kvm_pmu_cap.version = min(kvm_pmu_cap.version, 2); 172 kvm_pmu_cap.num_counters_fixed = min(kvm_pmu_cap.num_counters_fixed, 173 KVM_PMC_MAX_FIXED); 174 } 175 176 void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel); 177 void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int fixed_idx); 178 void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx); 179 180 void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu); 181 void kvm_pmu_handle_event(struct kvm_vcpu *vcpu); 182 int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data); 183 bool kvm_pmu_is_valid_rdpmc_ecx(struct kvm_vcpu *vcpu, unsigned int idx); 184 bool kvm_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr, bool host_initiated); 185 int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info); 186 int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info); 187 void kvm_pmu_refresh(struct kvm_vcpu *vcpu); 188 void kvm_pmu_reset(struct kvm_vcpu *vcpu); 189 void kvm_pmu_init(struct kvm_vcpu *vcpu); 190 void kvm_pmu_cleanup(struct kvm_vcpu *vcpu); 191 void kvm_pmu_destroy(struct kvm_vcpu *vcpu); 192 int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp); 193 void kvm_pmu_trigger_event(struct kvm_vcpu *vcpu, u64 perf_hw_id); 194 195 bool is_vmware_backdoor_pmc(u32 pmc_idx); 196 197 extern struct kvm_pmu_ops intel_pmu_ops; 198 extern struct kvm_pmu_ops amd_pmu_ops; 199 #endif /* __KVM_X86_PMU_H */ 200