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Date: Thu, 01 Dec 2011 16:03:12 +0100
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 07/18] qom: add link properties
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To: Anthony Liguori <aliguori@us.ibm.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Peter Maydell <peter.maydell@linaro.org>, Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>, Jan Kiszka <jan.kiszka@siemens.com>, qemu-devel@nongnu.org, Markus Armbruster <armbru@redhat.com>, Avi Kivity <avi@redhat.com>, Luiz Capitulino <lcapitulino@redhat.com>

  Hi,

> In terms of QMP client code, you just do:
> 
>  qom-set /path/to/usb-controller.slave /some/other/device

Lacks notification.  usb-controller doesn't notice that you have plugged
in some usb device and thus can't raise an IRQ to notify the guest ...

cheers,
  Gerd