[Xen-users] Re: AMD-V or VT

[Christian Tramnitz <chris.ace@xxxxxxx>]

Dustin Henning wrote:
>         If you search the archives, you will find that it is a bit
> complicated.  I don't know if I'm getting the details right, but I think
> basically you can pass PCI through to HVM guests without VT-D, but you need
> VT-D to pass through to PV guests.  If this is accurate, it may also apply
> to AMD-V without IOMMU.  I could be all out of whack, though, and it may be
> that VT-D doesn't even work for PV without hacking, I don't remember the
> details, and I haven't done it.
>         Dustin

It's exactly the other way around, you'll need VT-d (which is a chipset 
feature, NOT a cpu feature) to passthrough PCI(e) device to HVM guests. 
For PV guests VT-d is not needed (not even VT for that matter)...

Best regards,
   Christian


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