Re: [Xen-users] Does USB passthru require VT-d or IOMMU?

[Henning Holtschneider <henning@xxxxxxxx>]

To answer my own question and for the records:

Am 29.10.2008 um 15:13 schrieb Henning Holtschneider:

> I'm running Xen 3.3.0 on Ubuntu 8.10 server. I'm trying to pass a USB
> device to a Windows 2003 DomU, but the qemu logfile just tells me
> "Warning: could not add USB device host:0123:4567". Before I start to
> debug the problem more thoroughly, I wonder: do I need a mainboard
> chipset that supports Intel's VT-d technology or AMD's IOMMU to pass
> individual USB devices from the Dom0 to a DomU?
I solved my problem and I can now forward single USB devices by adding

usb=1
usbdevice = 'host:0123:4567'
usbdevice = 'host:89ab:cdef'

to the DomU configuration file. Initially, I tried

usb=1
usbdevice = [ 'host:0123:4567', 'host:89ab:cdef' ]

which seemed logical to me. But that syntax causes the error message I  
saw and no USB device will be forwarded. VT-d is not required for USB  
passthru.
Cheers,
Henning Holtschneider
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