Re: [Xen-users] Question about USB passthrough in HVM guest domain

[Gordan Bobic <gordan@xxxxxxxxxx>]

Typically a USB controller shows up as multiple PCI devices.
For example, on my machine:
# lspci -vvv | grep USB
00:1a.0 USB controller: Intel Corporation 82801JI (ICH10 Family) USB 
UHCI Controller #4 (prog-if 00 [UHCI])
00:1a.1 USB controller: Intel Corporation 82801JI (ICH10 Family) USB 
UHCI Controller #5 (prog-if 00 [UHCI])
00:1a.2 USB controller: Intel Corporation 82801JI (ICH10 Family) USB 
UHCI Controller #6 (prog-if 00 [UHCI])
00:1a.7 USB controller: Intel Corporation 82801JI (ICH10 Family) USB2 
EHCI Controller #2 (prog-if 20 [EHCI])
00:1d.0 USB controller: Intel Corporation 82801JI (ICH10 Family) USB 
UHCI Controller #1 (prog-if 00 [UHCI])
00:1d.1 USB controller: Intel Corporation 82801JI (ICH10 Family) USB 
UHCI Controller #2 (prog-if 00 [UHCI])
00:1d.2 USB controller: Intel Corporation 82801JI (ICH10 Family) USB 
UHCI Controller #3 (prog-if 00 [UHCI])
00:1d.7 USB controller: Intel Corporation 82801JI (ICH10 Family) USB2 
EHCI Controller #1 (prog-if 20 [EHCI])
You don't have to pass ALL of them to your domU. Figure out which
one(s) the USB devices you want to pass through are connected to
and only pass those through. You DO NOT have to pass the whole
device through with USB, e.g. 00:1a.* - passing only individual
sub-functions works fine (e.g. only 00:1a.0 and 00:1a.1).

Gordan

On 2014-06-03 20:19, Meng Xu wrote:
> Hi Jacek,
>
> Thank you very much for your replies! I tried to passing the whole usb
> controller before by using the PCI passthrough. However, after I pass
> throught the whole usb controller, I can no longer use keyboard and
> mouse in dom0. Is there anyway that I can use the usb devices in dom0
> after I passthough the whole usb controller?
>
> Thanks,
>
>  Meng Â
>
> 2014-06-03 15:14 GMT-04:00 jacek burghardt
> <jaceksburghardt@xxxxxxxxx>:
>
> > I don't thing the whole passing of usb devices is well supported
> > under xen. I always pass whole usb controller. I wonder if you can
> > get pci or epic usb controller and pass it
> --
>
> -----------
> Meng Xu
> PhD Student in Computer and Information Science
> University of Pennsylvania
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> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxx
> http://lists.xen.org/xen-users
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