I think you should appoint the usb bus which according to your usb type, such
as:
-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2
-device usb-ehci,id=usb1,bus=pci.0,addr=0x4
-device usb-hub,id=hub0,bus=usb.0,port=2
-device usb-tablet,id=input0,bus=usb.0,port=1
-device usb-host,hostbus=2,hostport=2,id=hostdev0,bus=usb1.0
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https://bugs.launchpad.net/bugs/685096
Title:
USB Passthrough not working for Windows 7 guest
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