From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Questions about PCI passthrough on Xen 4.0
Date: Wed, 6 Apr 2011 08:36:53 -0400
Message-ID: <20110406123653.GD5009@dumpdata.com>
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To: Song Xiang <classicxsong@gmail.com>
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On Wed, Apr 06, 2011 at 11:36:42AM +0100, Song Xiang wrote:
> I have set up Xen 4.0.0 on an AMD machine with 2*12core. (AMD
> Opteron(tm) Processor 6168)
> 
> But when I try to use PCI passthrough to pass an NIC to my HVM, the
> HVM can successfully seen the NIC, but it can not use it!!. (I have
> enable the DMA virtualization option of the AMD chip)
> 
> And, the machine will announce a "Power cycle AC" error when I
> enable the "DMA virtualization" in BIOS.

Wait a minute. You enable the option in the BIOS and the machine
power cycles you? That sounds like the BIOS is busted.

> 
> It there anything wrong with this kind of chip?

More like your BIOS.