Hi,

But the event driven-ness is from the device driver for the
host controller pov, and usb redirection is dealing with usb
at the device level / emulating a usb device. Has much changed
(other then speed) for the way usb looks from the device pov ?

One new thing in usb3 are streams for bulk xfers (Documentation/usb/bulk-streams.txt in the linux kernel source tree has a summary). Also superspeed iso packets can be less than maximum size (IIRC this isn't the case for usb2).

State transitions are a bit different. Also the address assignment: The xHCI handles the address assignment itself whereas with uhci/ehci the guest os handles this.

cheers,
  Gerd

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