Re: [patch v3 1/7] x86/smp: Make stop_other_cpus() more robust

[Borislav Petkov]

On Fri, Jun 16, 2023 at 08:01:56PM +0200, Thomas Gleixner wrote:
> From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Subject: x86/smp: Make stop_other_cpus() more robust
> Date: Wed, 26 Apr 2023 18:37:00 +0200
> 
> Tony reported intermittent lockups on poweroff. His analysis identified the
> wbinvd() in stop_this_cpu() as the culprit. This was added to ensure that
> on SME enabled machines a kexec() does not leave any stale data in the
> caches when switching from encrypted to non-encrypted mode or vice versa.
> 
> That wbindv() is conditional on the SME feature bit which is read directly

wbinvd()

Otherwise:

Reviewed-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>

-- 
Regards/Gruss,
    Boris.

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