usbdevice option and specifying a specific device

[Gordan Bobic <gordan@bobich.net>]

I'm trying to use usbdevice option in the config file (instead of 
passing USB PCI devices), and the documentation says to specify the 
device in the form host:xxxx:yyyy where xxxx:yyyy is the USB 
vendor:device ID.

Except there is a problem with this - I have two identical keyboards and 
mice, one set of which I want to pass to the host, and the other set 
which I want to pass to the guest. Since the xxxx:yyyy will be the same 
for both devices of each type, how can I deterministically specify which 
I want to keep on the host and which I want to pass to the guest?

Is there a way to use something like BusID:DeviceID instead in order to 
provide a more deterministic outcome?

Gordan