[libvirt] [PATCH 04/17] Add a test for long USB port paths

[Gerd Hoffmann]

On Fr, 2016-06-17 at 20:07 +0200, Ján Tomko wrote:
> For some reason, we support up to four levels of nested USB devices
> in the guest.

FYI: The reason is simply that usb is specified that way.  You can't
chain usb hubs endlessly.

cheers,
  Gerd