kvm vm vcpu to physical cpu affinity
u@uu:~$ sudo virsh list
[sudo] password for u:
Id Name State
--------------------------
4 vm10_x86 running
u@uu:~$ sudo virsh vcpuinfo 4
VCPU: 0
CPU: 2
State: running
CPU time: 307.4s
CPU Affinity: yyyy
u@uu:~$ sudo virsh vcpupin 4
VCPU CPU Affinity
----------------------
0 0-3
u@uu:~$ sudo virsh vcpupin 0 0
error: failed to get domain '0'
u@uu:~$ sudo virsh vcpupin 4 0 0