tools/perf/arch/x86/util/kvm-stat.c

   1 #include "../../util/kvm-stat.h"
   2 #include <asm/svm.h>
   3 #include <asm/vmx.h>
   4 #include <asm/kvm.h>
   5
   6 define_exit_reasons_table(vmx_exit_reasons, VMX_EXIT_REASONS);
   7 define_exit_reasons_table(svm_exit_reasons, SVM_EXIT_REASONS);
   8
   9 static struct kvm_events_ops exit_events = {
  10         .is_begin_event = exit_event_begin,
  11         .is_end_event = exit_event_end,
  12         .decode_key = exit_event_decode_key,
  13         .name = "VM-EXIT"
  14 };
  15
  16 const char *vcpu_id_str = "vcpu_id";
  17 const int decode_str_len = 20;
  18 const char *kvm_exit_reason = "exit_reason";
  19 const char *kvm_entry_trace = "kvm:kvm_entry";
  20 const char *kvm_exit_trace = "kvm:kvm_exit";
  21
  22 /*
  23  * For the mmio events, we treat:
  24  * the time of MMIO write: kvm_mmio(KVM_TRACE_MMIO_WRITE...) -> kvm_entry
  25  * the time of MMIO read: kvm_exit -> kvm_mmio(KVM_TRACE_MMIO_READ...).
  26  */
  27 static void mmio_event_get_key(struct perf_evsel *evsel, struct perf_sample *sample,
  28                                struct event_key *key)
  29 {
  30         key->key  = perf_evsel__intval(evsel, sample, "gpa");
  31         key->info = perf_evsel__intval(evsel, sample, "type");
  32 }
  33
  34 #define KVM_TRACE_MMIO_READ_UNSATISFIED 0
  35 #define KVM_TRACE_MMIO_READ 1
  36 #define KVM_TRACE_MMIO_WRITE 2
  37
  38 static bool mmio_event_begin(struct perf_evsel *evsel,
  39                              struct perf_sample *sample, struct event_key *key)
  40 {
  41         /* MMIO read begin event in kernel. */
  42         if (kvm_exit_event(evsel))
  43                 return true;
  44
  45         /* MMIO write begin event in kernel. */
  46         if (!strcmp(evsel->name, "kvm:kvm_mmio") &&
  47             perf_evsel__intval(evsel, sample, "type") == KVM_TRACE_MMIO_WRITE) {
  48                 mmio_event_get_key(evsel, sample, key);
  49                 return true;
  50         }
  51
  52         return false;
  53 }
  54
  55 static bool mmio_event_end(struct perf_evsel *evsel, struct perf_sample *sample,
  56                            struct event_key *key)
  57 {
  58         /* MMIO write end event in kernel. */
  59         if (kvm_entry_event(evsel))
  60                 return true;
  61
  62         /* MMIO read end event in kernel.*/
  63         if (!strcmp(evsel->name, "kvm:kvm_mmio") &&
  64             perf_evsel__intval(evsel, sample, "type") == KVM_TRACE_MMIO_READ) {
  65                 mmio_event_get_key(evsel, sample, key);
  66                 return true;
  67         }
  68
  69         return false;
  70 }
  71
  72 static void mmio_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
  73                                   struct event_key *key,
  74                                   char *decode)
  75 {
  76         scnprintf(decode, decode_str_len, "%#lx:%s",
  77                   (unsigned long)key->key,
  78                   key->info == KVM_TRACE_MMIO_WRITE ? "W" : "R");
  79 }
  80
  81 static struct kvm_events_ops mmio_events = {
  82         .is_begin_event = mmio_event_begin,
  83         .is_end_event = mmio_event_end,
  84         .decode_key = mmio_event_decode_key,
  85         .name = "MMIO Access"
  86 };
  87
  88  /* The time of emulation pio access is from kvm_pio to kvm_entry. */
  89 static void ioport_event_get_key(struct perf_evsel *evsel,
  90                                  struct perf_sample *sample,
  91                                  struct event_key *key)
  92 {
  93         key->key  = perf_evsel__intval(evsel, sample, "port");
  94         key->info = perf_evsel__intval(evsel, sample, "rw");
  95 }
  96
  97 static bool ioport_event_begin(struct perf_evsel *evsel,
  98                                struct perf_sample *sample,
  99                                struct event_key *key)
 100 {
 101         if (!strcmp(evsel->name, "kvm:kvm_pio")) {
 102                 ioport_event_get_key(evsel, sample, key);
 103                 return true;
 104         }
 105
 106         return false;
 107 }
 108
 109 static bool ioport_event_end(struct perf_evsel *evsel,
 110                              struct perf_sample *sample __maybe_unused,
 111                              struct event_key *key __maybe_unused)
 112 {
 113         return kvm_entry_event(evsel);
 114 }
 115
 116 static void ioport_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
 117                                     struct event_key *key,
 118                                     char *decode)
 119 {
 120         scnprintf(decode, decode_str_len, "%#llx:%s",
 121                   (unsigned long long)key->key,
 122                   key->info ? "POUT" : "PIN");
 123 }
 124
 125 static struct kvm_events_ops ioport_events = {
 126         .is_begin_event = ioport_event_begin,
 127         .is_end_event = ioport_event_end,
 128         .decode_key = ioport_event_decode_key,
 129         .name = "IO Port Access"
 130 };
 131
 132 const char *kvm_events_tp[] = {
 133         "kvm:kvm_entry",
 134         "kvm:kvm_exit",
 135         "kvm:kvm_mmio",
 136         "kvm:kvm_pio",
 137         NULL,
 138 };
 139
 140 struct kvm_reg_events_ops kvm_reg_events_ops[] = {
 141         { .name = "vmexit", .ops = &exit_events },
 142         { .name = "mmio", .ops = &mmio_events },
 143         { .name = "ioport", .ops = &ioport_events },
 144         { NULL, NULL },
 145 };
 146
 147 const char * const kvm_skip_events[] = {
 148         "HLT",
 149         NULL,
 150 };
 151
 152 int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid)
 153 {
 154         if (strstr(cpuid, "Intel")) {
 155                 kvm->exit_reasons = vmx_exit_reasons;
 156                 kvm->exit_reasons_isa = "VMX";
 157         } else if (strstr(cpuid, "AMD")) {
 158                 kvm->exit_reasons = svm_exit_reasons;
 159                 kvm->exit_reasons_isa = "SVM";
 160         } else
 161                 return -ENOTSUP;
 162
 163         return 0;
 164 }