xen: ignore RW mapping of RO pages in pagetable_init

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When setting up the initial pagetable, which includes mappings of all
low physical memory, ignore a mapping which tries to set the RW bit on
an RO pte.  An RO pte indicates a page which is part of the current
pagetable, and so it cannot be allowed to become RW.

Once xen_pagetable_setup_done is called, set_pte reverts to its normal
behaviour.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Acked-by: Chris Wright <chrisw@sous-sol.org>
Cc: ebiederm@xmission.com (Eric W. Biederman)

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Jeremy Fitzhardinge 2007-07-17 18:37:05 -07:00 • committed by Jeremy Fitzhardinge

parent f4f97b3ea9

commit 9a4029fd34

1 changed files with 25 additions and 2 deletions

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arch/i386/xen/enlighten.c

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