x86: 0.856 graphic: 0.807 mistranslation: 0.572 boot: 0.490 ppc: 0.487 peripherals: 0.472 architecture: 0.466 network: 0.436 performance: 0.425 vnc: 0.366 semantic: 0.332 device: 0.271 i386: 0.248 debug: 0.231 socket: 0.224 user-level: 0.213 PID: 0.210 virtual: 0.166 register: 0.138 permissions: 0.124 VMM: 0.112 hypervisor: 0.090 arm: 0.052 risc-v: 0.048 TCG: 0.044 assembly: 0.039 files: 0.031 kernel: 0.023 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.