From: Ian Campbell <ian.campbell@citrix.com>
Date: Fri, 26 Feb 2010 17:16:00 +0000 (+0000)
Subject: x86, xen: Disable highmem PTE allocation even when CONFIG_HIGHPTE=y
X-Git-Tag: v2.6.34-rc1~212^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=817a824b75b1475f1b067c8cee318c7b4d66fcde;p=pandora-kernel.git

x86, xen: Disable highmem PTE allocation even when CONFIG_HIGHPTE=y

There's a path in the pagefault code where the kernel deliberately
breaks its own locking rules by kmapping a high pte page without
holding the pagetable lock (in at least page_check_address). This
breaks Xen's ability to track the pinned/unpinned state of the
page. There does not appear to be a viable workaround for this
behaviour so simply disable HIGHPTE for all Xen guests.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
LKML-Reference: <1267204562-11844-1-git-send-email-ian.campbell@citrix.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Pasi Kärkkäinen <pasik@iki.fi>
Cc: <stable@kernel.org> # .32.x: 14315592: Allow highmem user page tables to be disabled at boot time
Cc: <stable@kernel.org> # .32.x
Cc: <xen-devel@lists.xensource.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---

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