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

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Message-ID: <20090508111432.GF11596@elte.hu>
Date:	Fri, 8 May 2009 13:14:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <yinghai@...nel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Arjan van de Ven <arjan@...radead.org>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 06/16] xen: disable PAT


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> From: Ian Campbell <ian.campbell@...rix.com>
> 
> Impact: disable PAT under Xen
> 
> Xen imposes a particular PAT layout on all paravirtual guests which
> does not match the layout Linux would like to use.
> 
> Force PAT to be disabled until this is resolved.
> 
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

hm, what will the resolution be? Every step in the direction of 
making Xen guests more special is a step in the wrong direction. 
Coupling between Xen and Linux should be reduced, not increased.

	Ingo
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