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

To: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT
From: "H. Peter Anvin" <hpa@xxxxxxxxx>
Date: Sun, 10 May 2009 10:55:36 -0700
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Jeremy Fitzhardinge <Jeremy.Fitzhardinge@xxxxxxxxxx>, Suresh Siddha <suresh.b.siddha@xxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "Pallipadi, Venkatesh" <venkatesh.pallipadi@xxxxxxxxx>, "Linux@xxxxxxxxx" <Linux@xxxxxxxxx>, Lu <yinghai@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Arjan van de Ven <arjan@xxxxxxxxxxxxx>
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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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