linux-kernel - Re: [PATCH 2/2] xen: don't drop NX bit

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Date:	Fri, 20 Jun 2008 14:59:24 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Stable Kernel <stable@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] xen: don't drop NX bit


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> When converting the pfn/mfn in a pagetable entry, make sure we mask 
> out the protection flags properly.  Formerly, this code was losing the 
> NX bit, and not dealing with extra Xen-defined software flags in ptes.
>
> Because NX is now enforced properly, we must put the hypercall page 
> into the .text segment so that it is executable.

applied all three fix patches to tip/x86/xen, thanks Jeremy.

i have also cherry-picked them into x86/urgent, to push v2.6.26-wards if 
they passes testing. The commits are [in that order]:

# x86/urgent: 4653938: xen: Use wmb instead of rmb in xen_evtchn_do_upcall().
# x86/urgent: 05345b0: xen: mask unwanted pte bits in __supported_pte_mask
# x86/urgent: ebb9cfe: xen: don't drop NX bit

	Ingo
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