From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: Backend in user space,
	how is its kernel dev unregistered?
Date: Thu, 05 Mar 2009 14:17:38 +0100
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References: <C5D4B13C.42F3%keir.fraser@eu.citrix.com>
	<87y6vkw3b5.fsf@pike.pond.sub.org>
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> The vfb and vkbd backends live in user space, i.e. there is no backend
> driver in the kernel.  device_unregister() never gets called.  This is a
> resource leak.

When a domain shuts down xend will cleanup the backend device entries in
xenstore, which in turn kills the devices.  At least they disappear from
sysfs on my box ...

cheers,
  Gerd