Re: [PATCH 1/3] perf/amd/ibs: Reset CPU0 IBS state on syscore resume

[Jim Mattson]

On Wed, Oct 14, 2026 at 11:04 PM Ravi Bangoria <ravi.bangoria@xxxxxxx> wrote:
>
> During a suspend/resume cycle, all CPUs except CPU0 go through hotplug
> callbacks, which sets up IBS state. CPU0 bypasses this path, leaving its
> IBS state stale after resume. Fix this by explicitly setting CPU0's IBS
> state in the syscore ->resume() callback.
>
> Fixes: efa5700ec0da ("perf/amd/ibs: Support IBS_{FETCH|OP}_CTL2[Dis] to eliminate RMW race")
> Signed-off-by: Ravi Bangoria <ravi.bangoria@xxxxxxx>
Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>