linux-kernel - Re: [Xen-devel] Re: [GIT PULL] xen /proc/mtrr implementation

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Message-ID: <4A1AC1BE.5050500@zytor.com>
Date:	Mon, 25 May 2009 09:05:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Tomasz Chmielewski <mangoo@...g.org>,
	LKML <linux-kernel@...r.kernel.org>, mingo@...e.hu,
	Alan <alan@...rguk.ukuu.org.uk>,
	Gerd Hoffmann <kraxel@...hat.com>, jeremy@...p.org,
	JBeulich@...ell.com, jbarnes@...tuousgeek.org
Subject: Re: [Xen-devel] Re: [GIT PULL] xen /proc/mtrr implementation

Andi Kleen wrote:
> 
> To my knowledge the only CPUs with broken PAT are some very old Pentium
> Pros dating from back the time when PAT was new and noone used it.
> On those it should be disabled or the high bits not used.
> 
> The kernel is overall too conservative with its white list.
> 
> Today a lot of other common operating systems use PAT extensively,
> so in general it works on the hardware level.
> 

Well, we don't use the high bits exactly for this reason.

	-hpa

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

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