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xen-devel
Re: [Xen-devel] Re: [PATCH 2/8] xen/mmu: Add the notion of identity (1-1
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To: |
Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] Re: [PATCH 2/8] xen/mmu: Add the notion of identity (1-1) mapping. |
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From: |
Ian Campbell <Ian.Campbell@xxxxxxxxxx> |
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Date: |
Tue, 4 Jan 2011 17:20:23 +0000 |
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Cc: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Jn Beulich <JBeulich@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx> |
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Tue, 04 Jan 2011 09:22:12 -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> <1294160359.3831.579.camel@xxxxxxxxxxxxxxxxxxxxxx> |
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On Tue, 2011-01-04 at 16:59 +0000, Ian Campbell wrote:
> 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.
I should have read patch 5/8 first...
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