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Revision 5f69076b

ID5f69076b8dda325dcbbc87bdb00e04ffac0f6137

Added by Gerd Hoffmann over 13 years ago

usb: add port property.

This allows to explictily set the physical port where you want to
plug the usb device. Example:

-device usb-tablet,bus=usb.0,port=2

With explicit port addressing qemu can and will not automagically add
USB Hubs. This means that:

(a) You can plug two devices of your choice into the two uhci
      root ports.
  (b) If you want plug in more that two devices you have to care
      about adding a hub yourself.

Plugging a hub works this way:

-device usb-hub,bus=usb.0,port=1

Use this to add a device to the hub:

-device usb-tablet,bus=usb.0,port=1.1

Signed-off-by: Gerd Hoffmann <>

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