tree 66352cc8d0791b83f9b1435465bc35c3126c4dad
parent f78e0e2ee498e8f847500b565792c7d7634dcf54
author Anthony Liguori <aliguori@us.ibm.com> 1193688920 -0500
committer Avi Kivity <avi@qumranet.com> 1201708378 +0200

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>