[Xen-changelog] [xen-4.0-testing] x86: fix guest migration after c/s 20892:d311d1efc25e

[Xen patchbot-4.0-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxxxx>
# Date 1310805313 -3600
# Node ID 89608751ccfc93a9b8d07488b72810b5cb8d1d35
# Parent  fd9e72e1b1c3633c3ae0618d7e0f4606e7813bd9
x86: fix guest migration after c/s 20892:d311d1efc25e

Guests would not manage to run successfully after being migrated to a
host having sufficiently much more memory than the host they were
originally started on.

Subsequently the plan is to re-enable the changes behavior under the
control of a guest kernel announced feature flag.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
xen-unstable changeset:   23706:3dd399873c9e
xen-unstable date:        Sat Jul 16 09:18:21 2011 +0100
---


diff -r fd9e72e1b1c3 -r 89608751ccfc xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c Sat Jul 16 09:34:57 2011 +0100
+++ b/xen/arch/x86/mm.c Sat Jul 16 09:35:13 2011 +0100
@@ -4490,7 +4490,7 @@
             .max_mfn = MACH2PHYS_NR_ENTRIES - 1
         };
 
-        if ( !mem_hotplug )
+        if ( !mem_hotplug && current->domain == dom0 )
             mapping.max_mfn = max_page - 1;
         if ( copy_to_guest(arg, &mapping, 1) )
             return -EFAULT;

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