From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: [Patch RFC 1/4] usb: support device specification
 via <bus>-<port>
Date: Fri, 17 Jul 2015 12:23:57 +0200
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To: Juergen Gross <jgross@suse.com>
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  Hi,

> > device_add monitor command.
> 
> Okay. I guess the USBDevice for the added device can be obtained
> in USBPortOps->attach via USBPort->dev ?

Yes.

> Doing a quick search through the sources I couldn't find a way to
> issue a monitor command from inside qemu. I assume I'd have to use
> do_device_add() directly?

qdev_device_add() should do it, yes.
Why do you need to call this from inside qemu?
Watching on xenbus and responding to new devices created there?

cheers,
  Gerd