arch/x86/kvm/pmu_amd.c

   1 /*
   2  * KVM PMU support for AMD
   3  *
   4  * Copyright 2015, Red Hat, Inc. and/or its affiliates.
   5  *
   6  * Author:
   7  *   Wei Huang <wei@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Implementation is based on pmu_intel.c file
  13  */
  14 #include <linux/types.h>
  15 #include <linux/kvm_host.h>
  16 #include <linux/perf_event.h>
  17 #include "x86.h"
  18 #include "cpuid.h"
  19 #include "lapic.h"
  20 #include "pmu.h"
  21
  22 static unsigned amd_find_arch_event(struct kvm_pmu *pmu,
  23                                     u8 event_select,
  24                                     u8 unit_mask)
  25 {
  26         return PERF_COUNT_HW_MAX;
  27 }
  28
  29 /* return PERF_COUNT_HW_MAX as AMD doesn't have fixed events */
  30 static unsigned amd_find_fixed_event(int idx)
  31 {
  32         return PERF_COUNT_HW_MAX;
  33 }
  34
  35 static bool amd_pmc_is_enabled(struct kvm_pmc *pmc)
  36 {
  37         return false;
  38 }
  39
  40 static struct kvm_pmc *amd_pmc_idx_to_pmc(struct kvm_pmu *pmu, int pmc_idx)
  41 {
  42         return NULL;
  43 }
  44
  45 /* returns 0 if idx's corresponding MSR exists; otherwise returns 1. */
  46 static int amd_is_valid_msr_idx(struct kvm_vcpu *vcpu, unsigned idx)
  47 {
  48         return 1;
  49 }
  50
  51 /* idx is the ECX register of RDPMC instruction */
  52 static struct kvm_pmc *amd_msr_idx_to_pmc(struct kvm_vcpu *vcpu, unsigned idx)
  53 {
  54         return NULL;
  55 }
  56
  57 static bool amd_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
  58 {
  59         return false;
  60 }
  61
  62 static int amd_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
  63 {
  64         return 1;
  65 }
  66
  67 static int amd_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
  68 {
  69         return 1;
  70 }
  71
  72 static void amd_pmu_refresh(struct kvm_vcpu *vcpu)
  73 {
  74 }
  75
  76 static void amd_pmu_init(struct kvm_vcpu *vcpu)
  77 {
  78 }
  79
  80 static void amd_pmu_reset(struct kvm_vcpu *vcpu)
  81 {
  82 }
  83
  84 struct kvm_pmu_ops amd_pmu_ops = {
  85         .find_arch_event = amd_find_arch_event,
  86         .find_fixed_event = amd_find_fixed_event,
  87         .pmc_is_enabled = amd_pmc_is_enabled,
  88         .pmc_idx_to_pmc = amd_pmc_idx_to_pmc,
  89         .msr_idx_to_pmc = amd_msr_idx_to_pmc,
  90         .is_valid_msr_idx = amd_is_valid_msr_idx,
  91         .is_valid_msr = amd_is_valid_msr,
  92         .get_msr = amd_pmu_get_msr,
  93         .set_msr = amd_pmu_set_msr,
  94         .refresh = amd_pmu_refresh,
  95         .init = amd_pmu_init,
  96         .reset = amd_pmu_reset,
  97 };