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 struct kvm_event_hw_type_mapping {
  15         u8 eventsel;
  16         u8 unit_mask;
  17         unsigned event_type;
  18 };
  19
  20 struct kvm_pmu_ops {
  21         unsigned (*find_arch_event)(struct kvm_pmu *pmu, u8 event_select,
  22                                     u8 unit_mask);
  23         unsigned (*find_fixed_event)(int idx);
  24         bool (*pmc_is_enabled)(struct kvm_pmc *pmc);
  25         struct kvm_pmc *(*pmc_idx_to_pmc)(struct kvm_pmu *pmu, int pmc_idx);
  26         struct kvm_pmc *(*msr_idx_to_pmc)(struct kvm_vcpu *vcpu, unsigned idx);
  27         int (*is_valid_msr_idx)(struct kvm_vcpu *vcpu, unsigned idx);
  28         bool (*is_valid_msr)(struct kvm_vcpu *vcpu, u32 msr);
  29         int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
  30         int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
  31         void (*refresh)(struct kvm_vcpu *vcpu);
  32         void (*init)(struct kvm_vcpu *vcpu);
  33         void (*reset)(struct kvm_vcpu *vcpu);
  34 };
  35
  36 static inline u64 pmc_bitmask(struct kvm_pmc *pmc)
  37 {
  38         struct kvm_pmu *pmu = pmc_to_pmu(pmc);
  39
  40         return pmu->counter_bitmask[pmc->type];
  41 }
  42
  43 static inline u64 pmc_read_counter(struct kvm_pmc *pmc)
  44 {
  45         u64 counter, enabled, running;
  46
  47         counter = pmc->counter;
  48         if (pmc->perf_event)
  49                 counter += perf_event_read_value(pmc->perf_event,
  50                                                  &enabled, &running);
  51         /* FIXME: Scaling needed? */
  52         return counter & pmc_bitmask(pmc);
  53 }
  54
  55 static inline void pmc_stop_counter(struct kvm_pmc *pmc)
  56 {
  57         if (pmc->perf_event) {
  58                 pmc->counter = pmc_read_counter(pmc);
  59                 perf_event_release_kernel(pmc->perf_event);
  60                 pmc->perf_event = NULL;
  61         }
  62 }
  63
  64 static inline bool pmc_is_gp(struct kvm_pmc *pmc)
  65 {
  66         return pmc->type == KVM_PMC_GP;
  67 }
  68
  69 static inline bool pmc_is_fixed(struct kvm_pmc *pmc)
  70 {
  71         return pmc->type == KVM_PMC_FIXED;
  72 }
  73
  74 static inline bool pmc_is_enabled(struct kvm_pmc *pmc)
  75 {
  76         return kvm_x86_ops->pmu_ops->pmc_is_enabled(pmc);
  77 }
  78
  79 /* returns general purpose PMC with the specified MSR. Note that it can be
  80  * used for both PERFCTRn and EVNTSELn; that is why it accepts base as a
  81  * paramenter to tell them apart.
  82  */
  83 static inline struct kvm_pmc *get_gp_pmc(struct kvm_pmu *pmu, u32 msr,
  84                                          u32 base)
  85 {
  86         if (msr >= base && msr < base + pmu->nr_arch_gp_counters) {
  87                 u32 index = array_index_nospec(msr - base,
  88                                                pmu->nr_arch_gp_counters);
  89
  90                 return &pmu->gp_counters[index];
  91         }
  92
  93         return NULL;
  94 }
  95
  96 /* returns fixed PMC with the specified MSR */
  97 static inline struct kvm_pmc *get_fixed_pmc(struct kvm_pmu *pmu, u32 msr)
  98 {
  99         int base = MSR_CORE_PERF_FIXED_CTR0;
 100
 101         if (msr >= base && msr < base + pmu->nr_arch_fixed_counters) {
 102                 u32 index = array_index_nospec(msr - base,
 103                                                pmu->nr_arch_fixed_counters);
 104
 105                 return &pmu->fixed_counters[index];
 106         }
 107
 108         return NULL;
 109 }
 110
 111 void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel);
 112 void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int fixed_idx);
 113 void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx);
 114
 115 void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu);
 116 void kvm_pmu_handle_event(struct kvm_vcpu *vcpu);
 117 int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data);
 118 int kvm_pmu_is_valid_msr_idx(struct kvm_vcpu *vcpu, unsigned idx);
 119 bool kvm_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr);
 120 int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
 121 int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
 122 void kvm_pmu_refresh(struct kvm_vcpu *vcpu);
 123 void kvm_pmu_reset(struct kvm_vcpu *vcpu);
 124 void kvm_pmu_init(struct kvm_vcpu *vcpu);
 125 void kvm_pmu_destroy(struct kvm_vcpu *vcpu);
 126
 127 extern struct kvm_pmu_ops intel_pmu_ops;
 128 extern struct kvm_pmu_ops amd_pmu_ops;
 129 #endif /* __KVM_X86_PMU_H */