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Re: [PATCH] x86/S3: restore MCE (APs) and add MTRR (BSP) init
- To: Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 4 Mar 2026 15:47:14 +0100
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 04 Mar 2026 14:47:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.03.2026 15:36, Marek Marczykowski wrote:
> On Wed, Mar 04, 2026 at 02:39:01PM +0100, Jan Beulich wrote:
>> MCE init for APs was broken when CPU feature re-checking was added. MTRR
>> (re)init for the BSP looks to never have been there on the resume path.
>>
>> Fixes: bb502a8ca592 ("x86: check feature flags after resume")
>> Reported-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> ---
>> Sadly we need to go by CPU number (zero vs non-zero) here. See the call
>> site of recheck_cpu_features() in enter_state().
>
> With this patch, I now see the "Thermal monitoring enabled" on resume
> also for AP.
> And then, the "Temperature above threshold" + "Running in modulated
> clock mode" for AP too. But, I don't see matching "Temperature/speed
> normal" for any of them...
Which would imply that for each CPU you see at most one such message after
resume. Can you confirm this? (Generally for every CPU they should be
alternating, but appear no more frequently than every 5 seconds. Albeit I
can't help the impression that it is possible for the current state to not
be reflected by the most recently seen message, for a potentially
indefinite period of time.)
> My simple performance test says it's okay for now, though. I'll see how
> it looks in a few hours...
I actually don't expect the change here to make a difference in that
regard. intel_thermal_interrupt() exists only for reporting purposes.
Jan
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