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Re: [Xen-devel] Questions about PCI passthrough on Xen 4.0

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] Questions about PCI passthrough on Xen 4.0
From: Wei Huang <wei.huang2@xxxxxxx>
Date: Wed, 6 Apr 2011 13:44:29 -0500
Cc: Song Xiang <classicxsong@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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As indicated by Konrad, if enabling IOMMU in BIOS will cause power cycle, it would be a BIOS bug then. Your description wasn't very clear. If you saw NIC been passthru to VM, when did "power cycle" happen? Maybe you can give us more details:

1. Machine vendor, BIOS vendor/version
2. Logs (xm dmesg after passthru)


On 04/06/2011 07:36 AM, Konrad Rzeszutek Wilk wrote:
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.

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