[Xen-changelog] [xen-unstable] mm: guest_remove_page() should not populate or unshare.

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Tim Deegan <tim@xxxxxxx>
# Date 1331811651 0
# Node ID da72de35e4a271f1faacd8e712c284ed8cd846a8
# Parent  fa7d1e7a5fae658686f041c080b45600be797744
mm: guest_remove_page() should not populate or unshare.

guest_remove_page() ought to use get_gfn_query() to look up the
current state of the gfn.  Otherwise it might populate or unshare
the gfn just before dropping it.

Signed-off-by: Tim Deegan <tim@xxxxxxx>
Committed-by: Tim Deegan <tim@xxxxxxx>
---


diff -r fa7d1e7a5fae -r da72de35e4a2 xen/common/memory.c
--- a/xen/common/memory.c       Thu Mar 15 11:12:44 2012 +0000
+++ b/xen/common/memory.c       Thu Mar 15 11:40:51 2012 +0000
@@ -162,7 +162,7 @@
     unsigned long mfn;
 
 #ifdef CONFIG_X86
-    mfn = mfn_x(get_gfn(d, gmfn, &p2mt)); 
+    mfn = mfn_x(get_gfn_query(d, gmfn, &p2mt)); 
     if ( unlikely(p2m_is_paging(p2mt)) )
     {
         guest_physmap_remove_page(d, gmfn, mfn, 0);

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