[Bug 685096] Re: USB Passthrough not working for Windows 7 guest

[Gonglei]

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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