Messages in this thread Patch in this message | | | Date | Thu, 11 Nov 2021 12:22:14 -0000 | From | "tip-bot2 for Like Xu" <> | Subject | [tip: perf/urgent] perf/x86/vlbr: Add c->flags to vlbr event constraints |
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The following commit has been merged into the perf/urgent branch of tip:
Commit-ID: 5863702561e625903ec678551cb056a4b19e0b8a Gitweb: https://git.kernel.org/tip/5863702561e625903ec678551cb056a4b19e0b8a Author: Like Xu <likexu@tencent.com> AuthorDate: Wed, 03 Nov 2021 17:17:16 +08:00 Committer: Peter Zijlstra <peterz@infradead.org> CommitterDate: Thu, 11 Nov 2021 13:09:34 +01:00
perf/x86/vlbr: Add c->flags to vlbr event constraints
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.
Fixes: 097e4311cda9 ("perf/x86: Add constraint to create guest LBR event without hw counter") Reported-by: Wanpeng Li <wanpengli@tencent.com> Signed-off-by: Like Xu <likexu@tencent.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Wanpeng Li <wanpengli@tencent.com> Link: https://lore.kernel.org/r/20211103091716.59906-1-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 6039644..42cf01e 100644 --- a/arch/x86/events/intel/core.c +++ b/arch/x86/events/intel/core.c @@ -3048,8 +3048,10 @@ 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; }
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