I had a whole host of problems that were eventually resolved by rebooting the physical server … but, in the process of trying to figure out exactly what was wrong, I wanted to console into the virtual machines from the physical server. Using “virsh console vmname” should have worked … but it didn’t. Turns out you’ve got to enable a service on each guest before you’re able to console in from the physical server. To do so, run:

systemctl enable serial-getty@ttyS0.service

And, if you want to connect in *right now*, also start the service:

systemctl start serial-getty@ttyS0.service

Now, running “virsh console vmname” doesn’t appear to do much … but, if you hit the enter key, you’ll get a logon prompt for the VM.