performance: 0.982
device: 0.830
KVM: 0.468
network: 0.416
PID: 0.382
other: 0.342
permissions: 0.320
debug: 0.302
graphic: 0.295
semantic: 0.288
boot: 0.284
socket: 0.222
files: 0.199
vnc: 0.126

Using qemu+kvm is slower than using qemu in rv6(xv6 rust porting)