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

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Message-ID: <47BDEF36.8000903@goop.org>
Date:	Thu, 21 Feb 2008 13:37:58 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Ian Campbell <ijc@...lion.org.uk>,
	Joel Becker <Joel.Becker@...cle.com>,
	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

H. Peter Anvin wrote:
>> Still curious about why a pagetable page is ending up in that range 
>> though.  Seems like it shouldn't be possible, since we shouldn't be 
>> allowed to allocate from those pages, at least until the DMI probe 
>> has happened...  Unless the early allocator is only excluded from 
>> e820 reserved pages, which would cause a problem on systems which 
>> don't reserve the DMI space...  HPA?
>>
>
> I thought the problem was a Xen-provided pagetable from before Linux 
> started? 

Hm, I don't think so.  The domain-builder pagetable is put after the 
kernel, so it shouldn't be under 1M.

    J
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