Pass through Unix sockets to guest

[AngusCrump]

Is there any way to directly pass through a socket from the host to the guest? The best solution I’ve been able to come up with so far is to use ssh socket forwarding, but it ends up being pretty messy as you have to have a ssh client running in the guest at all times.

[AngusCrump]

Was able to use socat to forward sockets using TCP, but it would be nice to see a native solution to this.

[sbrivio-rh]

You could probably use SSH over vsock as we do in passt tests, see https://passt.top/passt/tree/test/lib/context#n48. There, we need to test network stuff in a guest, and we want a simple way to run commands inside the guest itself without relying on networking.

From time to time, some users ask about proxying a TCP socket from a guest into a UNIX socket on the host, using passt, but nobody ever got time to implement that. Patches welcome, I think it's relatively simple.