A word of warning, if you try to run the passt tests on a recent qemu
git build.  A change to default options causes vsock to break.  You
can work around it by adding a `queue_reset=false` option to the vsock
device, or reverting to qemu commit 3c37f8b8d1e5 or earlier.

I've written up the details here:
    https://gitlab.com/qemu-project/qemu/-/issues/1318

Possibly I should also ping some people on qemu-devel.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson