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

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Message-ID: <CANRm+Cwo+oEoA4pCy-r5FnUdvY+oxAys0FNm7JHVHCCHW1rxWA@mail.gmail.com>
Date:   Thu, 4 Nov 2021 10:35:35 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     Like Xu <like.xu.linux@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>, linux-perf-users@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf/x86/vlbr: Add c->flags to vlbr event constraints

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

Tested-by: Wanpeng Li <wanpengli@...cent.com>