[Xen-users] General questions about VGA passthrough

[Francesco Cat <heartcollector87@xxxxxxxxx>]

I have a question regarding VGA passthrough.
If I understood correctly, the only way to have VGA passthrough is hiding the VGA from the Dom0 and giving full control of it to one guest. This means, the guest should just take ownership of the device and start using it (and therefore take control of the screen, too), right?

I read that one can dynamically hide PCI devices from the Dom0. What would happen if one did that with a VGA device? For example, if I am using linux with an active X server, what is likely to happen? In short, would it be possible to "switch" the control of the video card from the Dom0 to the DomU, keeping the Dom0 "alive" (IE: no crashes), then giving the VGA control back to the Dom0 after stopping the guest?

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