From mboxrd@z Thu Jan  1 00:00:00 1970
From: Igor Mammedov <imammedo@redhat.com>
Subject: Re: [Xen-users] Problem booting xen 4.1.2 on Athlon 64
 X2
Date: Thu, 22 Dec 2011 13:54:52 +0100
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On 12/22/2011 12:49 AM, Florian Manschwetus wrote:
>> (XEN) AMD-Vi: IOMMU not found!
>> (XEN) I/O virtualisation disabled

I've seen the same issue on a AMD system with upstream xen and
host booted after iommu=off was added to xen's cmd line..
Although log says that there isn't iommu, but it worth the shot.

-- 
Thanks,
  Igor