Xen users - Apr 2010 - Graphics Pass-Through: Reboot Doesn''t Work

Something I''m experiencing here using graphics/vga pass-through with
Xen 4....rebooting the domU does not seem to work.  I''m running Windows
XP, and, when I reboot, the domain appears to just shut down.  A look at the
xend.log file, however, shows the following entries:

[2010-04-15 15:24:15 17820] DEBUG (XendDomainInfo:2543)
XendDomainInfo.constructDomain
[2010-04-15 15:24:15 17820] ERROR (XendDomainInfo:486) VM start failed
Traceback (most recent call last):
  File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line
471, in start
    XendTask.log_progress(0, 30, self._constructDomain)
  File "/usr/lib64/python2.6/site-packages/xen/xend/XendTask.py", line
209, in log_progress
    retval = func(*args, **kwds)
  File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line
2705, in _constructDomain
    " it doesn''t exist." % (bus, dev, func))
VmError: failed to assign device 00:02.0: maybe it has already been assigned to
other domain, or maybe it doesn''t exist.
[2010-04-15 15:24:15 17820] DEBUG (XendDomainInfo:3107) XendDomainInfo.destroy:
domid=32
[2010-04-15 15:24:15 17820] DEBUG (XendDomainInfo:2451) No device model
[2010-04-15 15:24:15 17820] DEBUG (XendDomainInfo:2453) Releasing devices
[2010-04-15 15:24:15 17820] ERROR (XendDomainInfo:130) Domain construction
failed

So, looks like the graphics PCI device (00:02.0)  is not being released in a
timely fashion, and, when Xen tries to boot a new domain, it sees it as already
in use.  Anyone know any way around this - even just something like inserting a
reboot delay in so that Xen waits a couple of seconds before trying to restart
the domain?

Also, with regard to my post late last week - if anyone has any insight on
putting the video card into power save mode (or shutting it down completely)
when the domU shuts down, I''d appreciate it!

Thanks - Nick



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