Comment 23 for bug 685096

Hi, I had the same problem. Tested a lot. My solution to passthrough usb devices to a windows 7 x64 guest:

parameter part:

-device usb-ehci,id=usb,bus=pci.0,addr=0x4 -device usb-host,vendorid=0x{},productid=0x{},id=hostdev0,bus=usb.0

I also tried the device
piix4-usb-uhci

instead of usb-ehci

piix4-usb-uhci caused the Code 10 error in the windows device manager.

lsusb will give you a list of plugged in usb devices. eg.

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

1d6b:0002
and
1d6b:0003

are vendorid:prouctid

replace {} with the ids and it should work. I tested it with

- ssd usb 3.0 drive
- retail usb seagate usb 2.0 hdd drive.