linux-kernel - Re: [PATCH 05/12] i386: During page table initialization always set the leaf page table entries.

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Message-ID: <46361A86.70408@goop.org>
Date:	Mon, 30 Apr 2007 09:34:14 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Andi Kleen <ak@...e.de>,
	virtualization <virtualization@...ts.linux-foundation.org>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 05/12] i386: During page table initialization always set
 the leaf page table entries.

Eric W. Biederman wrote:
> If we don't set the leaf page table entries it is quite possible that
> will inherit and incorrect page table entry from the initial boot
> page table setup in head.S.  So we need to redo the effort here,
> so we pick up PSE, PGE and the like.
>
> Hypervisors like Xen require that their page tables be read-only,
> which is slightly incompatible with our low identity mappings, however
> I discussed this with Jeremy he has modified the Xen early set_pte
> function to avoid problems in this area.
>
> Andi I sent this once a part of the discussion on this issue so
> you may already have this patch in your queue.
>
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
>   

Acked-by: Jeremy Fitzhardinge <jeremy@...source.com>

    J
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