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author | Eric Hankland <ehankland@google.com> | 2020-02-03 17:25:04 -0800 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-02-05 16:47:17 +0100 |
commit | ddade902bc4c4473cadbd38a584e8cc9d3f18d55 (patch) | |
tree | 8f250754ec17bbd52c5bf09d1b590ae06ef124dd | |
parent | 97b5f9553a48a15296462dc4c6170200b0dd70b8 (diff) | |
download | kvm-unit-tests-ddade902bc4c4473cadbd38a584e8cc9d3f18d55.tar.gz |
x86: pmu: Test WRMSR on a running counter
Ensure that the value of the counter was successfully set to 0 after
writing it while the counter was running.
Signed-off-by: Eric Hankland <ehankland@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r-- | x86/pmu.c | 16 |
1 files changed, 16 insertions, 0 deletions
@@ -420,6 +420,21 @@ static void check_rdpmc(void) report_prefix_pop(); } +static void check_running_counter_wrmsr(void) +{ + pmu_counter_t evt = { + .ctr = MSR_IA32_PERFCTR0, + .config = EVNTSEL_OS | EVNTSEL_USR | gp_events[1].unit_sel, + .count = 0, + }; + + start_event(&evt); + loop(); + wrmsr(MSR_IA32_PERFCTR0, 0); + stop_event(&evt); + report(evt.count < gp_events[1].min, "running counter wrmsr"); +} + int main(int ac, char **av) { struct cpuid id = cpuid(10); @@ -454,6 +469,7 @@ int main(int ac, char **av) check_counters_many(); check_counter_overflow(); check_gp_counter_cmask(); + check_running_counter_wrmsr(); return report_summary(); } |