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[Xen-devel] Re: __supported_pte_mask breaks PROT_NONE pages

from [Ingo Molnar] [Permanent Link][Original]
To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: [Xen-devel] Re: __supported_pte_mask breaks PROT_NONE pages
From: Ingo Molnar <mingo@xxxxxxx>
Date: Thu, 5 Feb 2009 15:29:12 +0100
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, William Lee Irwin III <wli@xxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>
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* Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:

> On an x86 system which doesn't support global mappings,  
> __supported_pte_mask has _PAGE_GLOBAL clear, to make sure it never  
> appears in the PTE.  pfn_pte() and so on will enforce it with:

btw., did you actually see a boot crash due to this, on a pre-PGE system?

        Ingo

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