Qemu/kvm: multiple USB devices from the same vendor

Hi fellow gurus,
Trying to pass-through two USB devices. One works just fine, but two produces an error.
They are the same type from the same vendor and libvirt seems to have no way to differentiate between the two, as it only uses the <vendor id='0xnnnn'/> & <product id='0xnnn'/> strings and not serial number of the device.
There is a reference -unanswered- here: https://bugs.launchpad.net/qemu/+bug/1090602
The error message from virt-manager:
Error starting domain: operation failed: Multiple USB devices for 10c4:ea60, use <address> to specify one
Detailed output
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 44, in cb_wrapper
callback(asyncjob, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 65, in tmpcb
callback(*args, **kwargs)
File "/usr/share/virt-manager/virtManager/domain.py", line 1063, in startup
self._backend.create()
File "/usr/lib64/python2.6/site-packages/libvirt.py", line 678, in create
if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: operation failed: Multiple USB devices for 10c4:ea60, use <address> to specify one
The devices themselves:
Bus 001 Device 009: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP210x UART Bridge / myAVR mySmartUSB light
Bus 001 Device 008: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP210x UART Bridge / myAVR mySmartUSB light
Is there any workaround or fix for this?
Cheers,
Mike.
Last edited by DrMikeDuke (2013-07-22 14:01:18)

As I understand it, host:bus.addr is an alternative to host:vendor_id:product_id. So if I wanted to pass both of these thumb drives:
$ lsusb
Bus 001 Device 002: ID 1e3d:2093 Chipsbank Microelectronics Co., Ltd CBM209x Flash Drive (OEM)
Bus 001 Device 003: ID 1e3d:2093 Chipsbank Microelectronics Co., Ltd CBM209x Flash Drive (OEM)
I would use host:001.002 and host:001.003 . Note I said would use, because I've never tried it.
And usb_add is a qemu monitor command. See sections 3.4 and 3.5 of the doc you linked for info on the monitor.
All this being said, I don't use libvirt stuff so I don't know if it has the capability to specify USB devices by bus.addr or whether or not it enables the monitor.

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