Henning Holtschneider
2008-Oct-29 14:13 UTC
[Xen-users] Does USB passthru require VT-d or IOMMU?
Hello everybody, 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? Best regards, Henning Holtschneider -- LocaNet oHG - http://www.loca.net Lindemannstrasse 81, D-44137 Dortmund tel +49 231 91596-25, fax +49 231 91596-55 sip 25@voip.loca.net Registergericht Amtsgericht Dortmund HRA 14208 Geschäftsführer Sven Haufe, Henning Holtschneider _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Henning Holtschneider
2008-Nov-04 19:46 UTC
Re: [Xen-users] Does USB passthru require VT-d or IOMMU?
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 -- LocaNet oHG - http://www.loca.net Lindemannstrasse 81, D-44137 Dortmund tel +49 231 91596-25, fax +49 231 91596-55 sip 25@voip.loca.net Registergericht Amtsgericht Dortmund HRA 14208 Geschäftsführer Sven Haufe, Henning Holtschneider _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users