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Re: S3 regression related to XSA-471 patches
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 6 Aug 2025 12:36:56 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 06 Aug 2025 10:37:15 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.08.2025 12:23, Marek Marczykowski-Górecki wrote:
> We've got several reports that S3 reliability recently regressed. We
> identified it's definitely related to XSA-471 patches, and bisection
> points at "x86/idle: Remove broken MWAIT implementation". I don't have
> reliable reproduction steps, so I'm not 100% sure if it's really this
> patch, or maybe an earlier one - but it's definitely already broken at
> this point in the series. Most reports are about Xen 4.17 (as that's
> what stable Qubes OS version currently use), but I think I've seen
> somebody reporting the issue on 4.19 too (but I don't have clear
> evidence, especially if it's the same issue).
At the time we've been discussing the explicit raising of TIMER_SOFTIRQ
in mwait_idle_with_hints() a lot. If it was now truly missing, that imo
shouldn't cause problems only after resume, but then it may have covered
for some omission during resume. As a far-fetched experiment, could you
try putting that back (including the calculation of the "expires" local
variable)?
Jan
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