[PATCH][resend] perf x86 kvm-stat: support to analyze kvm msr

[Li RongQing]

From: Lei Zhao <zhaole...@baidu.com>

usage:
    - kvm stat
      run a command and gather performance counter statistics

    - show the result:
      perf kvm stat report --event=msr

See the msr events:

Analyze events for all VMs, all VCPUs:

MSR Access Samples  Samples% Time%  Min Time Max Time  Avg time

  0x6e0:W   67007  98.17%   98.31%  0.59us   10.69us  0.90us ( +-  0.10% )
  0x830:W    1186   1.74%    1.60%  0.53us  108.34us  0.82us ( +- 11.02% )
   0x3b:R      66   0.10%    0.09%  0.56us    1.26us  0.80us ( +-  3.24% )

Total Samples:68259, Total events handled time:61150.95us.

Signed-off-by: Li RongQing <lirongq...@baidu.com>
Signed-off-by: Lei Zhao <zhaole...@baidu.com>
---
 tools/perf/arch/x86/util/kvm-stat.c |   46 +++++++++++++++++++++++++++++++++++
 1 files changed, 46 insertions(+), 0 deletions(-)

diff --git a/tools/perf/arch/x86/util/kvm-stat.c 
b/tools/perf/arch/x86/util/kvm-stat.c
index 0729204..c5dd54f 100644
--- a/tools/perf/arch/x86/util/kvm-stat.c
+++ b/tools/perf/arch/x86/util/kvm-stat.c
@@ -133,11 +133,56 @@ static void ioport_event_decode_key(struct perf_kvm_stat 
*kvm __maybe_unused,
        .name = "IO Port Access"
 };
 
+ /* The time of emulation msr is from kvm_msr to kvm_entry. */
+static void msr_event_get_key(struct evsel *evsel,
+                                struct perf_sample *sample,
+                                struct event_key *key)
+{
+       key->key  = evsel__intval(evsel, sample, "ecx");
+       key->info = evsel__intval(evsel, sample, "write");
+}
+
+static bool msr_event_begin(struct evsel *evsel,
+                              struct perf_sample *sample,
+                              struct event_key *key)
+{
+       if (!strcmp(evsel->name, "kvm:kvm_msr")) {
+               msr_event_get_key(evsel, sample, key);
+               return true;
+       }
+
+       return false;
+}
+
+static bool msr_event_end(struct evsel *evsel,
+                            struct perf_sample *sample __maybe_unused,
+                            struct event_key *key __maybe_unused)
+{
+       return kvm_entry_event(evsel);
+}
+
+static void msr_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
+                                   struct event_key *key,
+                                   char *decode)
+{
+       scnprintf(decode, decode_str_len, "%#llx:%s",
+                 (unsigned long long)key->key,
+                 key->info ? "W" : "R");
+}
+
+static struct kvm_events_ops msr_events = {
+       .is_begin_event = msr_event_begin,
+       .is_end_event = msr_event_end,
+       .decode_key = msr_event_decode_key,
+       .name = "MSR Access"
+};
+
 const char *kvm_events_tp[] = {
        "kvm:kvm_entry",
        "kvm:kvm_exit",
        "kvm:kvm_mmio",
        "kvm:kvm_pio",
+       "kvm:kvm_msr",
        NULL,
 };
 
@@ -145,6 +190,7 @@ struct kvm_reg_events_ops kvm_reg_events_ops[] = {
        { .name = "vmexit", .ops = &exit_events },
        { .name = "mmio", .ops = &mmio_events },
        { .name = "ioport", .ops = &ioport_events },
+       { .name = "msr", .ops = &msr_events },
        { NULL, NULL },
 };
 
-- 
1.7.1