linux-kernel - Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT

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Message-ID: <4A071518.8000307@zytor.com>
Date:	Sun, 10 May 2009 10:55:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Keir Fraser <keir.fraser@...citrix.com>,
	Ian Campbell <Ian.Campbell@...citrix.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	"Linux@...or.com" <Linux@...or.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <Jeremy.Fitzhardinge@...rix.com>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jan Beulich <jbeulich@...ell.com>, Ingo Molnar <mingo@...e.hu>,
	Lu <yinghai@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT

Alan Cox wrote:
> 
> There are quite a few different CPUs with PAT errata. I've no idea why
> there are so many errata about that specific bit.
> 

I suspect it is simply because:

a) it moves around between the various page table formats;
b) the default configuration and existing OSes don't use it;
c) it isn't even *present* in some formats.

	-hpa

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

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