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xen-devel
[Xen-devel] Re: Xen MMU's requirement to pin pages RO and initial_memory
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To: |
"H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: Xen MMU's requirement to pin pages RO and initial_memory_mapping. |
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From: |
Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> |
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Date: |
Tue, 17 May 2011 18:51:58 +0100 |
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Cc: |
"jeremy@xxxxxxxx" <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx>, "yinghai@xxxxxxxxxx" <yinghai@xxxxxxxxxx> |
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Tue, 17 May 2011 10:51:10 -0700 |
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<20110513153010.GB16519@xxxxxxxxxxxx> <alpine.DEB.2.00.1105131650550.8972@kaball-desktop> <20110516154132.GA12486@xxxxxxxxxxxx> <4DD19D1F.3070506@xxxxxxxxxxxxxxx> |
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Alpine 2.00 (DEB 1167 2008-08-23) |
CC'ing Keir in case he knows something I am missing.
On Mon, 16 May 2011, H. Peter Anvin wrote:
> On 05/16/2011 08:41 AM, Konrad Rzeszutek Wilk wrote:
> >> They become pagetable pages when:
> >>
> >> - they are explicitly pinned by pin_pagetable_pfn
> >>
> >> - they are hooked into the current pagetable
> >
> > Ok, so could we use those two calls to trigger the pagetable walk
> > and mark them RO as appropiate? Which call sites are those? The
> > xen_set_pgd/xen_set_pud/xen_set_pmd ? Presumarily we don't have
> > to do that for the PTE's that are already mapped (as
> > xen_setup_kernel_pagetable, and xen_map_identity_early do this
> > already).
> >
> >> Like you wrote, considering that the x86_64 version of
> >> kernel_physical_mapping_init hooks the pagetable pages into the
> >> currently used pagetable, it wouldn't be possible to mark the pagetable
> >> pages RO after init_memory_mapping.
> >
>
> Doesn't Xen have some kind of compatibility mode which could be used
> during setup?
Unfortunately not that I am aware.
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