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

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Message-ID: <20121219235537.GP24895@liondog.tnic>
Date:	Thu, 20 Dec 2012 00:55:38 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	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 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.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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