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

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Message-ID: <47992710.2060108@zytor.com>
Date:	Thu, 24 Jan 2008 16:02:24 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
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.

Jeremy Fitzhardinge wrote:
> H. Peter Anvin wrote:
>> Yes.  We'd use it during initialization and at other times when we 
>> need trampolining, but give the swapper something which only has the 
>> kernel map.
> 
> Hm, though Xen makes it all a bit more complex, as usual.  In the PAE 
> case it wouldn't allow the pmd to be shared, so you'd have to allocate a 
> new pmd and copy into it.  There's probably a way to deal with it within 
> the existing paravirt hooks...
> 

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.

	-hpa
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