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Re: [PATCH for-4.22 v2 1/8] x86/mwait-idle: arrange for BSP MSR adjustments during S3 resume
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Thu, 14 May 2026 15:06:42 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Delivery-date: Thu, 14 May 2026 13:07:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, May 12, 2026 at 05:35:33PM +0200, Jan Beulich wrote:
> mwait_idle_cpu_init() is only called for APs, yet MSR writes will
> typically need re-doing post-S3 even for the BSP. When multiple cores /
> threads are present (and to come back online) in a package, for package
> scope MSRs this may be covered by APs doing the writes, but we can't rely
> on that.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
It's a bit unfortunate that we end up doing self-IPIs for the BSP
also, but that should be fixed elsewhere.
Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks, Roger.
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