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authorLike Xu <likexu@tencent.com>2021-11-03 17:17:16 +0800
committerPeter Zijlstra <peterz@infradead.org>2021-11-11 13:09:34 +0100
commit5863702561e625903ec678551cb056a4b19e0b8a (patch)
tree47384c41dbe7fec2d2f5c53ce93b9e1b1569f9b2
parent0fe39a3929ac7af980347814d552a734b51adacf (diff)
downloadlinux-5863702561e625903ec678551cb056a4b19e0b8a.tar.bz2
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
-rw-r--r--arch/x86/events/intel/core.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 603964408d2d..42cf01ecdd13 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;
}