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From: Gerd Hoffmann <kraxel@redhat.com>
Date: Fri, 12 Jun 2015 12:55:42 +0200
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Subject: Re: [Qemu-devel] USB pass through via usb-host
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To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

> 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