linux-kernel - Re: [PATCH] i386/PAE: avoid temporarily inconsistent pte-s

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Message-Id: <200709191817.30569.ak@suse.de>
Date:	Wed, 19 Sep 2007 18:17:30 +0200
From:	Andi Kleen <ak@...e.de>
To:	"Jan Beulich" <jbeulich@...ell.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i386/PAE: avoid temporarily inconsistent pte-s

On Wednesday 19 September 2007 18:16:25 Jan Beulich wrote:
> >>> Andi Kleen <ak@...e.de> 19.09.07 18:09 >>>
> >On Wednesday 19 September 2007 16:39:39 Jan Beulich wrote:
> >> One more of these issues (which were considered fixed a few releases
> >> back): Other than on x86-64, i386 allows set_fixmap() to replace
> >> already present mappings. Consequently, on PAE, care must be taken to
> >> not update the high half of a pte while the low half is still holding
> >> the old value.
> >
> >Hmm perhaps it would be better to just forbid it on i386 too.
> >Do you know who uses it?
> 
> PCI's mmconfig accessor. One could of course make it call clear_fixmap() prior
> to establishing a new mapping, but I thought that was not intended and is the
> reason for allowing this.

Makes sense. Applied thanks.

-Andi

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