From: "H. Peter Anvin" <hpa@zytor.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Tomasz Chmielewski <mangoo@wpkg.org>,
LKML <linux-kernel@vger.kernel.org>,
mingo@elte.hu, Alan <alan@lxorguk.ukuu.org.uk>,
Gerd Hoffmann <kraxel@redhat.com>,
jeremy@goop.org, JBeulich@novell.com, jbarnes@virtuousgeek.org
Subject: Re: [Xen-devel] Re: [GIT PULL] xen /proc/mtrr implementation
Date: Mon, 25 May 2009 09:05:18 -0700 [thread overview]
Message-ID: <4A1AC1BE.5050500@zytor.com> (raw)
In-Reply-To: <20090525091530.GW846@one.firstfloor.org>
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.
next prev parent reply other threads:[~2009-05-25 16:06 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-25 8:42 Tomasz Chmielewski
2009-05-25 9:15 ` Andi Kleen
2009-05-25 9:31 ` Jan Beulich
2009-05-25 9:47 ` Andi Kleen
2009-05-25 16:05 ` H. Peter Anvin [this message]
-- strict thread matches above, loose matches on Subject: below --
2009-05-12 23:27 Jeremy Fitzhardinge
2009-05-13 13:30 ` Ingo Molnar
2009-05-13 14:39 ` Jeremy Fitzhardinge
2009-05-15 18:27 ` Ingo Molnar
2009-05-15 20:09 ` Jeremy Fitzhardinge
2009-05-15 23:26 ` Eric W. Biederman
2009-05-15 23:49 ` Jeremy Fitzhardinge
2009-05-16 3:22 ` Jesse Barnes
2009-05-16 4:26 ` Eric W. Biederman
2009-05-18 4:57 ` Jeremy Fitzhardinge
2009-05-18 8:59 ` Ingo Molnar
2009-05-18 13:17 ` [Xen-devel] " Jan Beulich
2009-05-18 18:07 ` Jeremy Fitzhardinge
2009-05-19 9:59 ` Ingo Molnar
2009-05-19 10:22 ` [Xen-devel] " Jan Beulich
2009-05-19 11:08 ` Ingo Molnar
2009-05-19 12:04 ` Gerd Hoffmann
2009-05-19 12:26 ` Ingo Molnar
2009-05-19 12:32 ` Alan Cox
2009-05-19 12:37 ` Ingo Molnar
2009-05-19 13:21 ` Gerd Hoffmann
2009-05-19 13:31 ` Ingo Molnar
2009-05-19 13:51 ` Gerd Hoffmann
2009-05-19 14:17 ` Ingo Molnar
2009-05-19 14:55 ` Gerd Hoffmann
2009-05-19 15:24 ` Ingo Molnar
2009-05-20 8:01 ` Gerd Hoffmann
2009-05-20 16:35 ` Jeremy Fitzhardinge
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