Re: [Qemu-devel] [PATCH] xhci: child detach fix

[Gerd Hoffmann]

  Hi,

> BTW, in usb_release_port(), the detached port should be insert
> the head of bus->free list table. Because of the save/restore will
> cause qemu crash, after hot plug/hot unplug multi times. For example,
> save the port '2' to memory file, but when we restore it, the port will
> be assign to '1' over again, which not match with the memory file,
> and then crash qemu.

If you want hotplug and live migration play well you have to explicitly
assign devices ports, i.e.

  -device usb-host,port=2,$args

Otherwise it will simply not work reliable.

cheers,
  Gerd