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

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Message-ID: <47992948.60308@goop.org>
Date:	Thu, 24 Jan 2008 16:11:52 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Ian Campbell <ijc@...lion.org.uk>, Ingo Molnar <mingo@...e.hu>,
	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.

H. Peter Anvin wrote:
> Yeah, I'm aware of this particular piece of Xen braindamage, and 
> although I had some very unkind words to say about it, it mirrors what 
> we have to do for the !PAE case anyway, so it can be sort of glossed 
> over.

Sort of.  If Xen weren't an issue, then both cases are a matter of 
copying a set of entries from one place in the pgd to another.

It would be easy enough to add some code on xen side to look for pmd 
aliases when using/pinning a pagetable, and allocate'n'copy a new pmd 
page as needed.  That way the core code can ignore the issue.

    J
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