linux-kernel - Re: 2.6.25-rc1 xen pvops regression

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Message-Id: <1203546624.26910.76.camel@cthulhu.hellion.org.uk>
Date:	Wed, 20 Feb 2008 22:30:24 +0000
From:	Ian Campbell <ijc@...lion.org.uk>
To:	Joel Becker <Joel.Becker@...cle.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jody Belka <lists-lkml@...b.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andi Kleen <andi@...stfloor.org>,
	Mika Penttila <mika.penttila@...umbus.fi>
Subject: Re: 2.6.25-rc1 xen pvops regression

On Wed, 2008-02-20 at 13:42 -0800, Joel Becker wrote:
> 	What changed to make this not work in the first place?  New dmi
> code?

I don't think so -- this code is present even in the 2.6.18-xen.hg tree
(where it's gated with is_initial_domain() which isn't suitable for the
upstream tree).

I don't really know why it should start happening now. It may be that
some of the recentish changes to e.g. early_ioremap or early pagetable
setup etc. have tweaked the layout of the early pagetables around so
this problem bites us more readily. Or it may just be a combination of
kernel image size, RAM size and perhaps a dose of bad luck.

Ian.
-- 
Ian Campbell

... at least I thought I was dancing, 'til somebody stepped on my hand.
		-- J. B. White

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