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 (*find_arch_event)(struct kvm_pmu *pmu, u8 event_select, 26 u8 unit_mask); 27 unsigned (*find_fixed_event)(int idx); 28 bool (*pmc_is_enabled)(struct kvm_pmc *pmc); 29 struct kvm_pmc *(*pmc_idx_to_pmc)(struct kvm_pmu *pmu, int pmc_idx); 30 struct kvm_pmc *(*rdpmc_ecx_to_pmc)(struct kvm_vcpu *vcpu, 31 unsigned int idx, u64 *mask); 32 struct kvm_pmc *(*msr_idx_to_pmc)(struct kvm_vcpu *vcpu, u32 msr); 33 int (*is_valid_rdpmc_ecx)(struct kvm_vcpu *vcpu, unsigned int idx); 34 bool (*is_valid_msr)(struct kvm_vcpu *vcpu, u32 msr); 35 int (*get_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr_info); 36 int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr_info); 37 void (*refresh)(struct kvm_vcpu *vcpu); 38 void (*init)(struct kvm_vcpu *vcpu); 39 void (*reset)(struct kvm_vcpu *vcpu); 40 }; 41 42 static inline u64 pmc_bitmask(struct kvm_pmc *pmc) 43 { 44 struct kvm_pmu *pmu = pmc_to_pmu(pmc); 45 46 return pmu->counter_bitmask[pmc->type]; 47 } 48 49 static inline u64 pmc_read_counter(struct kvm_pmc *pmc) 50 { 51 u64 counter, enabled, running; 52 53 counter = pmc->counter; 54 if (pmc->perf_event) 55 counter += perf_event_read_value(pmc->perf_event, 56 &enabled, &running); 57 /* FIXME: Scaling needed? */ 58 return counter & pmc_bitmask(pmc); 59 } 60 61 static inline void pmc_release_perf_event(struct kvm_pmc *pmc) 62 { 63 if (pmc->perf_event) { 64 perf_event_release_kernel(pmc->perf_event); 65 pmc->perf_event = NULL; 66 pmc->current_config = 0; 67 pmc_to_pmu(pmc)->event_count--; 68 } 69 } 70 71 static inline void pmc_stop_counter(struct kvm_pmc *pmc) 72 { 73 if (pmc->perf_event) { 74 pmc->counter = pmc_read_counter(pmc); 75 pmc_release_perf_event(pmc); 76 } 77 } 78 79 static inline bool pmc_is_gp(struct kvm_pmc *pmc) 80 { 81 return pmc->type == KVM_PMC_GP; 82 } 83 84 static inline bool pmc_is_fixed(struct kvm_pmc *pmc) 85 { 86 return pmc->type == KVM_PMC_FIXED; 87 } 88 89 static inline bool pmc_is_enabled(struct kvm_pmc *pmc) 90 { 91 return kvm_x86_ops.pmu_ops->pmc_is_enabled(pmc); 92 } 93 94 static inline bool kvm_valid_perf_global_ctrl(struct kvm_pmu *pmu, 95 u64 data) 96 { 97 return !(pmu->global_ctrl_mask & data); 98 } 99 100 /* returns general purpose PMC with the specified MSR. Note that it can be 101 * used for both PERFCTRn and EVNTSELn; that is why it accepts base as a 102 * paramenter to tell them apart. 103 */ 104 static inline struct kvm_pmc *get_gp_pmc(struct kvm_pmu *pmu, u32 msr, 105 u32 base) 106 { 107 if (msr >= base && msr < base + pmu->nr_arch_gp_counters) { 108 u32 index = array_index_nospec(msr - base, 109 pmu->nr_arch_gp_counters); 110 111 return &pmu->gp_counters[index]; 112 } 113 114 return NULL; 115 } 116 117 /* returns fixed PMC with the specified MSR */ 118 static inline struct kvm_pmc *get_fixed_pmc(struct kvm_pmu *pmu, u32 msr) 119 { 120 int base = MSR_CORE_PERF_FIXED_CTR0; 121 122 if (msr >= base && msr < base + pmu->nr_arch_fixed_counters) { 123 u32 index = array_index_nospec(msr - base, 124 pmu->nr_arch_fixed_counters); 125 126 return &pmu->fixed_counters[index]; 127 } 128 129 return NULL; 130 } 131 132 static inline u64 get_sample_period(struct kvm_pmc *pmc, u64 counter_value) 133 { 134 u64 sample_period = (-counter_value) & pmc_bitmask(pmc); 135 136 if (!sample_period) 137 sample_period = pmc_bitmask(pmc) + 1; 138 return sample_period; 139 } 140 141 void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel); 142 void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int fixed_idx); 143 void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx); 144 145 void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu); 146 void kvm_pmu_handle_event(struct kvm_vcpu *vcpu); 147 int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data); 148 int kvm_pmu_is_valid_rdpmc_ecx(struct kvm_vcpu *vcpu, unsigned int idx); 149 bool kvm_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr); 150 int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info); 151 int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info); 152 void kvm_pmu_refresh(struct kvm_vcpu *vcpu); 153 void kvm_pmu_reset(struct kvm_vcpu *vcpu); 154 void kvm_pmu_init(struct kvm_vcpu *vcpu); 155 void kvm_pmu_cleanup(struct kvm_vcpu *vcpu); 156 void kvm_pmu_destroy(struct kvm_vcpu *vcpu); 157 int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp); 158 159 bool is_vmware_backdoor_pmc(u32 pmc_idx); 160 161 extern struct kvm_pmu_ops intel_pmu_ops; 162 extern struct kvm_pmu_ops amd_pmu_ops; 163 #endif /* __KVM_X86_PMU_H */ 164