Messages in this thread Patch in this message | | | From | Like Xu <> | Subject | [PATCH] perf/x86/vlbr: Add c->flags to vlbr event constraints | Date | Wed, 3 Nov 2021 17:17:16 +0800 |
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From: Like Xu <likexu@tencent.com>
Just like what we do in the x86_get_event_constraints(), the PERF_X86_EVENT_LBR_SELECT flag should also be propagated to event->hw.flags so that the host lbr driver can save/restore MSR_LBR_SELECT for the special vlbr event created by KVM or BPF.
Reported-by: Wanpeng Li <wanpengli@tencent.com> Fixes: 097e4311cda9 ("perf/x86: Add constraint to create guest LBR event without hw counter") Signed-off-by: Like Xu <likexu@tencent.com> --- arch/x86/events/intel/core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c index 7011e87be6d0..30b5d1b3cb03 100644 --- a/arch/x86/events/intel/core.c +++ b/arch/x86/events/intel/core.c @@ -2997,8 +2997,10 @@ intel_vlbr_constraints(struct perf_event *event) { struct event_constraint *c = &vlbr_constraint; - if (unlikely(constraint_match(c, event->hw.config))) + if (unlikely(constraint_match(c, event->hw.config))) { + event->hw.flags |= c->flags; return c; + } return NULL; } -- 2.33.0
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