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From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH] set usb bus name by busno.
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To: qiaochong <qiaochong@loongson.cn>
Cc: qemu-devel@nongnu.org

On 03/29/13 03:48, qiaochong wrote:
> So when we add several usb buses on system, we can add usb device on
> special usb bus by special usb bus name usb-bus.busno.

Just name your usb host adapters using id (i.e. -device usb-ehci,id=foo).
The usb bus name will be "${id}.0" then.

cheers,
  Gerd