Xen devel - Jul 2009 - [PATCH]xend: passthrough: loosen the pci co-assignment for pv guest

In current xend, we can not assign co-assignment devices to different guests,
even for pv guests. This patch loosens the policy for pv guest: if none of
the co-assignment devices have been assigned to hvm guest, we can assign the
devices to different pv guests.

The patch also adds a detection: if a device has been assigned to guest,
we can't try to "xm pci-attach" it to the same guest again. 

Thanks,
-- Dexuan

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