linux-kernel - Re: __supported_pte_mask breaks PROT

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Message-ID: <498A7BE3.40405@zytor.com>
Date:	Wed, 04 Feb 2009 21:40:51 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: __supported_pte_mask breaks PROT_NONE pages

[Dropped wli from the Cc: list because holomorphy.com doesn't resolve]

Jeremy Fitzhardinge wrote:
> 
> I guess the best fix is to only apply __supported_pte_mask to present
> ptes.  This seems like the right solution to me, as it means we can
> completely ignore the issue of overlaps between the present pte bits and
> the non-present pte-as-swap entry use of the bits.  (Patch below.)
> 

It certainly looks reasonable, so I have applied this patch to
tip:x86/urgent.  However, since I'm on the way out to FOSDEM I won't be
able to run any tests on this.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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