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

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Message-ID: <479921F5.9020902@goop.org>
Date:	Thu, 24 Jan 2008 15:40:37 -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:
> While we're mucking around in this area, there is another thing which 
> we should eventually get around to fixing:
>
> we need a set of page tables with an identity mapping as well as the 
> kernel mapping, for trampolining (during startup, but also during 
> things like ACPI suspend/resume.)  Right now, we let those be the 
> swapper page tables, but that's probably not really a good idea, since 
> it can hide bugs.

So you're suggesting a second system pagetable which has a P=V alias as 
well as the normal kernel mapping, used only when we actually need that 
alias?  Sounds simple enough to arrange.

    J
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