graphic: 0.895
device: 0.754
performance: 0.678
debug: 0.272
semantic: 0.232
other: 0.223
network: 0.122
PID: 0.119
boot: 0.095
permissions: 0.073
vnc: 0.031
socket: 0.016
files: 0.007
KVM: 0.004

qemu-img map qcow2 image,but can't get right zero area