Messages in this thread Patch in this message | | | From | David Ahern <> | Subject | [PATCH 2/3] perf: require exclude_guest to use PEBS - kernel side enforcement | Date | Mon, 10 Sep 2012 10:40:15 -0600 |
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From: Peter Zijlstra <peterz@infradead.org>
See https://lkml.org/lkml/2012/7/9/298
Signed-off-by: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Robert Richter <robert.richter@amd.com> Cc: Gleb Natapov <gleb@redhat.com> Cc: Avi Kivity <avi@redhat.com> --- arch/x86/kernel/cpu/perf_event.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index 915b876..4bc96c5 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -338,6 +338,9 @@ int x86_setup_perfctr(struct perf_event *event) /* BTS is currently only allowed for user-mode. */ if (!attr->exclude_kernel) return -EOPNOTSUPP; + + if (!attr->exclude_guest) + return -EOPNOTSUPP; } hwc->config |= config; @@ -380,6 +383,9 @@ int x86_pmu_hw_config(struct perf_event *event) if (event->attr.precise_ip) { int precise = 0; + if (!event->attr.exclude_guest) + return -EOPNOTSUPP; + /* Support for constant skid */ if (x86_pmu.pebs_active && !x86_pmu.pebs_broken) { precise++; -- 1.7.10.1
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