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

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Subject: [Xen-changelog] [xen-unstable] x86: fix guest migration after c/s 20892:d311d1efc25e
From: Xen patchbot-unstable <patchbot@xxxxxxx>
Date: Sun, 17 Jul 2011 12:55:14 +0100
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# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxxxx>
# Date 1310804301 -3600
# Node ID 3dd399873c9ef7762f4353f3259e502394f56a34
# Parent  24e9ca968a2bc09d1aac927fcdbb7b769901d067
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>

diff -r 24e9ca968a2b -r 3dd399873c9e xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c Sat Jul 16 09:17:20 2011 +0100
+++ b/xen/arch/x86/mm.c Sat Jul 16 09:18:21 2011 +0100
@@ -4861,7 +4861,7 @@
             .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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