KVM SR-IOV after VFs exist: virtio eth0 for management, VF eth1 for datapath.
PF and VF must have no IP on the host before you pass the VF. pci-stub / libvirt hostdev is the bind step. If sriov_numvfs is still empty, create VFs on the PF first.
https://sunshout.tistory.com/1580
