performance: 0.982
device: 0.830
KVM: 0.468
network: 0.416
arm: 0.407
PID: 0.382
register: 0.369
permissions: 0.320
peripherals: 0.310
debug: 0.302
graphic: 0.295
semantic: 0.288
boot: 0.284
kernel: 0.251
architecture: 0.232
socket: 0.222
hypervisor: 0.202
files: 0.199
ppc: 0.196
TCG: 0.161
risc-v: 0.150
mistranslation: 0.128
vnc: 0.126
user-level: 0.114
virtual: 0.103
VMM: 0.086
assembly: 0.035
i386: 0.034
x86: 0.032

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