Xen users - Mar 2011 - HVM domain with PCI passthrough cannot reboot

We have a Win 2008 R2 domain with a single PCI slot (00:13.0, an USB
controller) passed through to it.  We are using the pvops kernel (the
stable-2.6.32.x git branch) with Xen 4.0.1 (or 4.0.2-rc2, doesn''t seem
to matter).  Everything is working great, except for one thing: when we
try to reboot the Windows VM, it shuts down correctly, but most of the
time it fails to restart with the following error message in xend.log:
VmError: failed to assign device 00:13.0: maybe it has already been
assigned to other domain, or maybe it doesn''t exist.

If we log in to the host after the failed reboot and manually xm start
the domain, it does start without problems.  From our non-xen-expert
viewpoint it looks like the domain tries to restart before it had time
to detach the PCI slot from the shut down domain...

Does anyone have any pointers how to fix this?

Thanks,
Akos

-- 
Akos Szalkai <szalkai@2f.hu>
Principal IT Consultant, CISA
2F 2000 Szamitastechnikai es Szolgaltato Kft.
Tel: (+36-1)-4887700  Fax: (+36-1)-4887709  WWW: http://www.2f.hu/


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2011/3/8 Akos Szalkai <szalkai@2f.hu>
> We have a Win 2008 R2 domain with a single PCI slot (00:13.0, an USB
> controller) passed through to it.  We are using the pvops kernel (the
> stable-2.6.32.x git branch) with Xen 4.0.1 (or 4.0.2-rc2, doesn''t
seem
> to matter).  Everything is working great, except for one thing: when we
> try to reboot the Windows VM, it shuts down correctly, but most of the
> time it fails to restart with the following error message in xend.log:
> VmError: failed to assign device 00:13.0: maybe it has already been
> assigned to other domain, or maybe it doesn''t exist.
>
> If we log in to the host after the failed reboot and manually xm start
> the domain, it does start without problems.  From our non-xen-expert
> viewpoint it looks like the domain tries to restart before it had time
> to detach the PCI slot from the shut down domain...
>
> Does anyone have any pointers how to fix this?
>
Based upon my understanding  you might need to tweak with following in
xend-config-sxp

(device-create-timeout 100)
(device-destroy-timeout 100)

or  following option
# Whether to enable core-dumps when domains crash.
#(enable-dump no)

But I am not an expert so I might be wrong.Some one else should confirm it.

-- 
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