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Re: [Xen-devel] Xeno Linux never pins L1 tables ?

from [Jeremy Fitzhardinge] [Permanent Link][Original]
To: Satya <satyakiran@xxxxxxxxx>
Subject: Re: [Xen-devel] Xeno Linux never pins L1 tables ?
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 16 Oct 2007 14:18:00 -0700
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Satya wrote:
> Wonder what happens if an L1 page is created *after* a PGD is pinned ?
> I think I have to explicitly pin the L1 page then? or unlikely( does
> Xen pin it when I map into into the pinned PGD using a hypercall )

When you update the L2 entry to point to the L1, Xen checks to make sure
the L1 page is all OK (read-only, valid contents), then pins it to the
rest of the pagetable.

    J

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