linux-kernel - Re: [PATCH 7/7] x86/mce: Clear Local MCE opt-in before kexec

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Message-ID: <CALCETrVgDCbUXMMu6AXdwzZJYQ7qYYfPiP3NaPpOm7L8jEdxpQ@mail.gmail.com>
Date:	Thu, 16 Jul 2015 18:16:50 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Borislav Petkov <bp@...e.de>
Cc:	Ingo Molnar <mingo@...nel.org>, Tony Luck <tony.luck@...el.com>,
	X86-ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	ashok.raj@...el.com, Chen Gong <gong.chen@...ux.intel.com>,
	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>,
	Oleg Nesterov <oleg@...hat.com>,
	linux-edac <linux-edac@...r.kernel.org>
Subject: Re: [PATCH 7/7] x86/mce: Clear Local MCE opt-in before kexec

On Thu, Jul 16, 2015 at 12:44 AM, Borislav Petkov <bp@...e.de> wrote:
> From: Ashok Raj <ashok.raj@...el.com>
>
> kexec could boot a kernel that could be legacy with no knowledge of
> LMCE. Hence we should make sure we clear LMCE optin before kexec reboot.
>

What happens if an offline-but-not-unplugged CPU gets an MCE?  Or does
this code also clear CR4.MCE?

--Andy
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