Re: [Qemu-devel] [RFC] Add serial number to usbdevice when passthrough to VM

[Lei Li]

On 01/16/2013 03:56 PM, Gerd Hoffmann wrote:
> On 01/16/13 08:18, Lei Li wrote:
> > Hi guys,
> >
> > Currently we can passthrough the host USB device to the virtual
> > machine. This is done like:
> >
> > –usbdevice  host:1234:5678, where 1234 is vendor id, 5678 is product
> > id.
> >
> > But there is a problem. If there are two identical USB devices,
> > where the vendor id and the product id is the same. It's not possible
> > to direct one USB device to VM1 and the second USB device to VM2.
> You can assign devices by physical port.
> See docs/usb2.txt

Yes, I have read this doc, I know it also support hostbus+hostport or
hostbus+hostaddr combinations.

But as the backinfo's request, should we extented the usbdevice parameter
like:

--usbdevice host:<vendor id>[:<product id>[:<serial number>]?

What happened if upper app try to passthough those identical USB devices
by vendorid+productid combination?

AFAIK, Virtualbox support to distingish those device by adding this
third parameter 'Serial Number' for vendorid+productid combination.
 

> cheers,
>    Gerd


--
Lei