virtio virtio char device, logs are forwarded early in the installation and in real time. Anaconda will automatically use the port /dev/virtio-ports/org.fedoraproject.anaconda.log.0 if available.
virtio logging with virt-install virtio, use the --channel option:
--channel tcp,host=127.0.0.1:6080,mode=connect,target_type=virtio,name=org.fedoraproject.anaconda.log.0