On Thu, Nov 30, 2017 at 11:29:56AM +0800, Jason Wang wrote:

If my understanding is correct there's no need to for any extension of
virtio spec.

There appears to be a concern that some existing configurations
might use same MAC for an unrelated reason. Not sure what
that could be, but for sure, we could add a feature flag.
That needs to be approved by the virtio TC, but it's
just a single line in the spec no big deal, we can help here.

If this is true, maybe you can start to prepare the patch?

Yes, please do. We can add a safeguard of a feature bit on top.

-- 
MST