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Date: Mon, 10 Oct 2011 22:35:13 +0200
From: Borislav Petkov <bp@...64.org>
To: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc: "tj@...nel.org" <tj@...nel.org>,
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Subject: Re: [PATCH v2 0/3] Freezer, CPU hotplug, x86 Microcode: Fix task
freezing failures
On Mon, Oct 10, 2011 at 03:00:18PM -0400, Srivatsa S. Bhat wrote:
> > Hmm... is it possible to tell whether the core coming online is the
> > same one as the last time? If that's possible, the problem becomes
> > pretty simple and we can simply tell people who are mixing
> > suspend/hibernate with physical hotplug that they're crazy.
> >
>
> I think that is pretty easy, atleast from a microcode revision standpoint:
> the collect_cpu_info() function (defined in arch/x86/kernel/microcode_core.c
> and arch/x86/kernel/microcode_intel.c or ..._amd.c) can be used for that
> purpose. Am I right Boris?
Correct, on AMD the PATCH_LEVEL MSR (0x8b) contains the ... doh, current
patch level of the core, i.e. the applied ucode version.
--
Regards/Gruss,
Boris.
Advanced Micro Devices GmbH
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