[libvirt-users] USB Host Controllers

[Daniel P. Berrange]

On Mon, Jun 25, 2012 at 07:16:03PM +0200, Michael Hierweck wrote:
> Hi,
> 
> it is possible to define a domain along with several usb host
> controllers, e.g.
> 
> <controller type='usb' index='0' model='ich9-ehci' />
> <controller type='usb' index='1' model='ich9-uhci' />
> 
> How to distinguish between those controllers/busses when adding input or
> host devices such as
> 
> <input type='tablet' bus='usb'/>
> <hostdev mode='subsystem' type='usb' managed='no'>
>   <source>
>     <vendor id='...'/>
>     <product id='...'/>
>   </source>
> </hostdev>
> 
> Without explicit assignment either every device seems to be attached to
> the uhci controller or the domain refuses to start because the tablet is
> attached to the ehci controller implicitly, depending on the order of
> the controller definition (index).

You ought to be able to add the following

  <address type='usb' bus='1' port='1'/>

eg

 <hostdev mode='subsystem' type='usb' managed='no'>
   <source>
     <vendor id='...'/>
     <product id='...'/>
   </source>
   <address type='usb' bus='1' port='1'/>
 </hostdev>

The 'bus' attribute value on <address> matches up to the 'index'
on the <controller> you want to attach to

Daniel
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