From: Anthony Liguori <aliguori@us.ibm.com>
Date: Mon, 29 Oct 2007 20:15:20 +0000 (-0500)
Subject: KVM: Fix gfn_to_page() acquiring mmap_sem twice
X-Git-Tag: v2.6.25-rc1~1138^2~176
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aab61cc0d28f6fab0c2c9137d95dea54c7dbcf46;p=pandora-kernel.git

KVM: Fix gfn_to_page() acquiring mmap_sem twice

KVM's nopage handler calls gfn_to_page() which acquires the mmap_sem when
calling out to get_user_pages().  nopage handlers are already invoked with the
mmap_sem held though.  Introduce a __gfn_to_page() for use by the nopage
handler which requires the lock to already be held.

This was noticed by tglx.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
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