> The questions are:
> 1. can we really pass a root hub to a guest?

No.  You can't pass-through hubs (no matter whenever root or other).

> What is expected to happen 
> there?

Nothing.  Hubs are ignored by usb-host.

> 2. can we tell if the root hubs in the guest are emulated or from usb-host?

They are emulated.

cheers,
  Gerd



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