Re: [PATCH] perf/x86/vlbr: Add c->flags to vlbr event constraints

[Wanpeng Li]

On Wed, 3 Nov 2021 at 17:17, Like Xu <like.xu.linux@xxxxxxxxx> wrote:
>
> From: Like Xu <likexu@xxxxxxxxxxx>
>
> 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@xxxxxxxxxxx>
> Fixes: 097e4311cda9 ("perf/x86: Add constraint to create guest LBR event without hw counter")
> Signed-off-by: Like Xu <likexu@xxxxxxxxxxx>

Tested-by: Wanpeng Li <wanpengli@xxxxxxxxxxx>