> A question about PCI devices. If we leave security problems aside, is it
> possible to provide access of a PCI device to 2 domains (may include dom
> 0), i.e. would current xen implementation suffice or a PCI device can only
> be used exclusively by a domain.
Not usually: devices are basically stupid and they only expect one entity to 
be talking to them. If you get multiple domains driving a device directly 
it'll probably end in tears, although it might be amusing :-)
You've really got two choices:
1) Just assign a device to one domain at a time - maybe buy multiple devices 
to serve multiple domains.
2) Virtualise at a higher level using a backend / frontend. e.g. the virtual 
block device, virtual net dev, virtual usb dev, etc...
What are you actually trying to achieve?
Cheers,
Mark
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