From mboxrd@z Thu Jan  1 00:00:00 1970
From: Suravee Suthikulanit <suravee.suthikulpanit@amd.com>
Subject: x86/AMD: Nested hvm crashes in 4.3
Date: Wed, 26 Jun 2013 19:24:27 -0500
Message-ID: <51CB863B.6020405@amd.com>
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To: Jan Beulich <JBeulich@suse.com>
Cc: "Shin, Jacob" <Jacob.Shin@amd.com>, "Hurwitz,
	Sherry" <sherry.hurwitz@amd.com>, Keir Fraser <keir@xen.org>, Suravee Suthikulanit <suravee.suthikulpanit@amd.com>, xen-devel <xen-devel@lists.xen.org>
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Hi Jan,

I have found an issue in where the system crash right when I start 
another HVM guest inside an HVM guest.  I have traced back to the patch 
which the issue started.

commit f1bde87fc08ce8c818a1640a8fe4765d48923091
Author: Jan Beulich <jbeulich@suse.com>
Date:   Fri Feb 8 11:06:04 2013 +0100

     x86: debugging code for testing 16Tb support on smaller memory systems

     Signed-off-by: Jan Beulich <jbeulich@suse.com>
     Acked-by: Keir Fraser <keir@xen.org>

The issue doesn't reproduce when starting a PV (L2) guest inside an HVM 
(L1) guest.

Suravee

PS: The L2 Xen is running Xen-4.3, but I think the issue is at the L1 
Xen since it crashes the system.