[Xen-changelog] [xen-4.1-testing] x86: fix guest migration after c/s 20892:d311d1efc25e

[Xen patchbot-4.1-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxxxx>
# Date 1310805226 -3600
# Node ID 1c7b601b1b35bd1e703fd219856702e9a5cafd08
# Parent  6a9d5d3b1b9e59a171402992fb7e59c8c4f32742
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 6a9d5d3b1b9e -r 1c7b601b1b35 xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c Sat Jul 16 09:33:07 2011 +0100
+++ b/xen/arch/x86/mm.c Sat Jul 16 09:33:46 2011 +0100
@@ -4782,7 +4782,7 @@
             .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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