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

[Wei Huang <wei.huang2@xxxxxxx>]

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)

Thanks,
-Wei


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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