diff options
author | Eric Hankland <ehankland@google.com> | 2020-02-21 14:41:33 -0800 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-02-24 19:44:35 +0100 |
commit | 59ca1413704856e3cf788c4386c07ceaedfb9089 (patch) | |
tree | 6a8ba834adde668b95c14cc064e0f16c8fff82fe | |
parent | 5779d60cccfbd325a68837795c6884c6bf6d7e67 (diff) | |
download | kvm-unit-tests-59ca1413704856e3cf788c4386c07ceaedfb9089.tar.gz |
x86: pmu: Test perfctr overflow after WRMSR on a running counter
Ensure that a WRMSR on a running counter will correctly update when the
counter should overflow (similar to the existing overflow test case but
with the counter being written to while it is running).
Signed-off-by: Eric Hankland <ehankland@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r-- | x86/pmu.c | 19 |
1 files changed, 18 insertions, 1 deletions
@@ -422,17 +422,34 @@ static void check_rdpmc(void) static void check_running_counter_wrmsr(void) { + uint64_t status; pmu_counter_t evt = { .ctr = MSR_IA32_PERFCTR0, .config = EVNTSEL_OS | EVNTSEL_USR | gp_events[1].unit_sel, .count = 0, }; + report_prefix_push("running counter wrmsr"); + start_event(&evt); loop(); wrmsr(MSR_IA32_PERFCTR0, 0); stop_event(&evt); - report(evt.count < gp_events[1].min, "running counter wrmsr"); + report(evt.count < gp_events[1].min, "cntr"); + + /* clear status before overflow test */ + wrmsr(MSR_CORE_PERF_GLOBAL_OVF_CTRL, + rdmsr(MSR_CORE_PERF_GLOBAL_STATUS)); + + evt.count = 0; + start_event(&evt); + wrmsr(MSR_IA32_PERFCTR0, -1); + loop(); + stop_event(&evt); + status = rdmsr(MSR_CORE_PERF_GLOBAL_STATUS); + report(status & 1, "status"); + + report_prefix_pop(); } int main(int ac, char **av) |