That's what I tried (I skipped the patching), the VM didn't find any NIC when I added that option (maybe I did it wrong), like this:
net0: virtio=BC:24:11:D4:9D:A9,bridge=vmbr0,firewall=1,host_tunnel=off
@fiona was that meant for me ?
Edit: I guess so, I tried adding that option to the nic of the vm and turning checksumming but it then the network of the vm didnt work (no nic found in the vm)