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xen-devel
[Xen-devel] Re: [PATCH 2/8] xen/mmu: Add the notion of identity (1-1) ma
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To: |
Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH 2/8] xen/mmu: Add the notion of identity (1-1) mapping. |
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From: |
Ian Campbell <ijc@xxxxxxxxxxxxxx> |
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Date: |
Tue, 04 Jan 2011 16:59:19 +0000 |
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Cc: |
Fitzhardinge <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jeremy, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Beulich <JBeulich@xxxxxxxxxx>, Jan, Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx> |
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Tue, 04 Jan 2011 09:03:33 -0800 |
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<1293738517-7287-1-git-send-email-konrad.wilk@xxxxxxxxxx> <1293738517-7287-3-git-send-email-konrad.wilk@xxxxxxxxxx> <1294160028.3831.563.camel@xxxxxxxxxxxxxxxxxxxxxx> |
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On Tue, 2011-01-04 at 16:53 +0000, Ian Campbell wrote:
>
> If I do "__set_phys_to_machine(X, X)" where X happens to currently
> correspond to p2m_mid_missing won't that cause all pfn entries in the
> range covered by p2m_top[topidx] (i.e. quite a few, like 512^2 pages
> or
> something) to switch from missing to identity? Similarly for
> p2m_top[topidx][mididx]?
>
> Perhaps ranges of identity bits are often well aligned with the
> boundaries in the p2m 3-level tree but wouldn't that just be
> coincidence?
I wonder if it would make sense to have a debugfs file which exports the
p2m, for the purposes of eye-balling it for this sort of issue?
comparing to the e820 etc...
Maybe the whole thing in raw form would be overkill but spitting out a
list of ranges of identity, invalid, normal pages, plus annotation
regarding whether those come from a p2m_mid_identity style page or a
leaf node, might be occasionally useful.
Ian.
--
Ian Campbell
Current Noise: Place of Skulls - The Watchers
Call toll free number before digging.
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