with virt-manager, it is a breeze to select the PCI device (in this case enp3s0 NIC) for pass through to guest vm, in case the vm shall get it’s very own dedicated nic:

notice: the passed NIC dissapears from the ip -c a list of NICs on the server

the answers here all suck: https://serverfault.com/questions/446658/assign-individual-nic-to-kvm-guest

and the login-process is a pain X-D (server-fault is one sites of many that ought to share the same login details… but well X-D)