Use gfn_to_mfn_query() rather then gfn_to_mfn() when changing
P2M types since we do not really want to force a PoD allocation
as a side effect.

Signed-off-by: Paul Durrant <Paul.Durrant@xxxxxxxxxx>

diff -r 74cefb50559e xen/arch/x86/mm/p2m.c
--- a/xen/arch/x86/mm/p2m.c	Fri Oct 30 15:52:02 2009 +0000
+++ b/xen/arch/x86/mm/p2m.c	Fri Oct 30 16:47:29 2009 +0000
@@ -2557,7 +2557,7 @@
 
     p2m_lock(d->arch.p2m);
 
-    mfn = gfn_to_mfn(d, gfn, &pt);
+    mfn = gfn_to_mfn_query(d, gfn, &pt);
     if ( pt == ot )
         set_p2m_entry(d, gfn, mfn, 0, nt);