linux-kernel - Re: [PATCH] x86: Construct 32 bit boot time page tables in native format.

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Message-ID: <479E35DB.2010702@zytor.com>
Date:	Mon, 28 Jan 2008 12:06:51 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Pavel Machek <pavel@....cz>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Ingo Molnar <mingo@...e.hu>, Ian Campbell <ijc@...lion.org.uk>,
	Mika Penttilä <mika.penttila@...umbus.fi>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] x86: Construct 32 bit boot time page tables in native
 format.

Jeremy Fitzhardinge wrote:
> H. Peter Anvin wrote:
>>  and we already have to have code to synchronize the PGDs on !PAE and 
>> the PMDs on Xen (although that was supposedly getting fixed).
> 
> No, I don't have any plans there.  Xen will continue to require 
> non-shared kernel pmd, at least for a 32-bit host.  I think the point is 
> that nothing that requires an identity mapping will work under Xen 
> anyway, so Xen just doesn't care about this case.
> 

Still makes it a special case, not just for this.

	-hpa
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