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

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Message-ID: <50D24F9D.5070802@zytor.com>
Date:	Wed, 19 Dec 2012 15:37:01 -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 03:30 PM, Borislav Petkov wrote:
> On Wed, Dec 19, 2012 at 03:17:59PM -0800, H. Peter Anvin wrote:
>> I presume with "too big" he really means "oddly shaped".
>
> Yeah, that's why it could be enlarged a little in order to adjust it to
> the MTRR scheme. This is what the BKDG says about it:
>

Yes, they should just cap the hole a few megabytes short and put an UC 
MTRR at 0xfc00000000.  That should happen regardless... this system is 
dangerous without it.

	-hpa

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

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