Patch "perf/x86/vlbr: Add c->flags to vlbr event constraints" has been added to the 5.10-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    perf/x86/vlbr: Add c->flags to vlbr event constraints

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     perf-x86-vlbr-add-c-flags-to-vlbr-event-constraints.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit b73f838b9291537d6f1ce53bace5129e85ae3c48
Author: Like Xu <likexu@xxxxxxxxxxx>
Date:   Wed Nov 3 17:17:16 2021 +0800

    perf/x86/vlbr: Add c->flags to vlbr event constraints
    
    [ Upstream commit 5863702561e625903ec678551cb056a4b19e0b8a ]
    
    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@xxxxxxxxxxx>
    Signed-off-by: Like Xu <likexu@xxxxxxxxxxx>
    Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
    Tested-by: Wanpeng Li <wanpengli@xxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20211103091716.59906-1-likexu@xxxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 4684bf9fcc428..a521135247eb6 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -2879,8 +2879,10 @@ 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;
 }