From: "Jan Beulich" <jbeulich@novell.com>
To: "Andi Kleen" <ak@suse.de>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] i386/PAE: avoid temporarily inconsistent pte-s
Date: Wed, 19 Sep 2007 17:16:25 +0100 [thread overview]
Message-ID: <46F16779.76E4.0078.0@novell.com> (raw)
In-Reply-To: <200709191809.47351.ak@suse.de>
>>> Andi Kleen <ak@suse.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.
Jan
next prev parent reply other threads:[~2007-09-19 16:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-19 14:39 [PATCH] i386/PAE: avoid temporarily inconsistent pte-s Jan Beulich
2007-09-19 16:09 ` Andi Kleen
2007-09-19 16:16 ` Jan Beulich [this message]
2007-09-19 16:17 ` Andi Kleen
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