graphic: 0.546
device: 0.500
performance: 0.496
semantic: 0.409
permissions: 0.258
network: 0.158
other: 0.128
debug: 0.126
files: 0.084
socket: 0.062
vnc: 0.060
boot: 0.047
KVM: 0.029
PID: 0.018

qemu-nbd -l and -s options don't work together