@olivierlambert Nice.
I have a few ideas, but for starters, I would like to try something that seems simple enough to implement and that I miss from ESXi: A GUI to setup hardware passthrough.

It would show up the devices on the host, allow the user to check the ones to reserve for passthrough and then assign them to VMs (I'm assuming that injecting a new field into the VM config is not something that's possible, so everything can be managed from the same page instead).

This might be a silly question (either because it's really easy or because the API isn't open that way), but anyway.

I would like to create a couple of plugins for Xen Orchestra. How do I get started?