linux-kernel - Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update ucode on Intel's CPU

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Message-ID: <50D25464.6040007@zytor.com>
Date:	Wed, 19 Dec 2012 15:57:24 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>, Jacob Shin <jacob.shin@....com>,
	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>
Subject: Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update
 ucode on Intel's CPU

On 12/19/2012 03:55 PM, Borislav Petkov wrote:
> On Wed, Dec 19, 2012 at 03:50:14PM -0800, H. Peter Anvin wrote:
>> We are trying to discuss mitigation strategies with you, but you
>> haven't really given us any useful information, e.g. what happens near
>> the various boundaries of the hole, what could trigger prefeching into
>> the range, and what it would take to fix the BIOSes.
>
> Another thing we could do (I admit it is ugly) is to add a quirk to the
> #MC handler and detect that specific condition by looking at the address
> reported in MCi_ADDR and exit early by not panicking the system.
>
> Again, this is ugly but a possibility, still.
>

I would really, really hate to have to deal with an early MCE handler, too.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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