arch/x86/kvm/pmu.h

   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, u32 msr, u64 *data);
  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, u32 msr, u64 *data);
 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 */