[Qemu-devel] [PATCH 0/4] Enable virtio-{rng,balloon} by default

[Anthony Liguori]

This series depends on my virtio-rng series from earlier but goes quite a bit
further.

It creates a default backend for the virtio-rng-pci device that will be
available if the user doesn't explicitly set one.

It also creates a mechanism to provide a simple way to specify default devices
via QEMUMachine.

Finally, it adds virtio-rng and virtio-balloon to the default machine.

The principle here is to try and make a naive execution of qemu as useful as
possible.

When it comes to virtio-rng, I think it's a lot to ask of a user to try and
decide whether they need or not--so let's always make it available.

For virtio-balloon, there's really no harm in having it present and it enables
ballooning which is a feature most users expect and are aware of.

I would expect us to use a similar mechanism to expose a virtio-serial channel
for qemu-ga once we plumb guest agent actions through QMP.