[djs55]

s/added/currently trying to add/ :-)

For HVM guests I hope that virtio-rng would work as-is (if it could be turned on via the control path). That's definitely worth a look.

For PV guests like Mirage I'm currently plumbing through a Xen PV analogue of virtio-serial by hijacking^Wextending the existing PV console support. Since the backend for that is in qemu already it might be possible to hook up the entropy source (with all the rate limiting etc). I think the trick would be to get the guest to recognise the frontend for what it is -- I imagine the virtio-rng device in the guest presents itself as a magic hardware PCI device and 'just works'.