graphic: 0.807 instruction: 0.681 mistranslation: 0.572 boot: 0.490 network: 0.436 vnc: 0.366 semantic: 0.332 device: 0.271 socket: 0.224 other: 0.186 assembly: 0.039 KVM: 0.018 pci_add auto nic failed on qemu monitor hello! execute "qemu-system-x86_64 -M pc -m 256 -hda pc/img.qcow2 -nographic -net nic,vlan=0,macaddr=00:e0:fc:00:00:01 -net tap,vlan=0,ifname=tap0,script=no -serial tcp::3333,server,nowait -boot c" and then (qemu) pci_add auto nic vlan=1,macaddr=00:e0:fc:40:20:02 Property 'e1000.netdev' can't take value 'hub0port0', it's in use the qemu version is 1.4.1 thx! The pci_add command has been remove since QEMU 2.3.0 ... so I'm closing this bug now - sorry that nobody picked this up in 2013! If you still can reproduce this problem with device_add, please feel free to open this ticket again.