(1)  command end with show error msg.
[root@vmi20 .libs]# xm vcpu-list vm1
Error: Domain 'vm1' does not exist.
Usage: xm vcpu-list [<Domain>]

List the VCPUs for a domain or all domains.
[root@vmi20 .libs]# ./virsh vcpuinfo vm1
error: Domain shut off, virtual CPUs not present.

[root@vmi20 .libs]# 
[root@vmi20 .libs]# 
[root@vmi20 .libs]# ./virsh vcpupin vm1 0 0
xenDaemonDomainPinCpu() in
error: POST operation failed: xend_post: error from xen daemon: No such domain vm1

[root@vmi20 .libs]# xm vcpu-list vm1
Error: Domain 'vm1' does not exist.
Usage: xm vcpu-list [<Domain>]

List the VCPUs for a domain or all domains.
[root@vmi20 .libs]# ./virsh vcpuinfo vm1
error: Domain shut off, virtual CPUs not present.


(2)  command end normaly but can't set cpu affnity.
[root@vmi20 .libs]# xm vcpu-list vm1
Name                              ID VCPUs   CPU State   Time(s) CPU Affinity
vm1                  1     0     0   -b-       5.2 any cpu
vm1                  1     1     0   -b-       3.8 any cpu

[root@vmi20 .libs]# ./virsh vcpuinfo vm1
VCPU:           0
CPU:            0
State:          idle
CPU time:       8.3s
CPU Affinity:   yy

VCPU:           1
CPU:            0
State:          idle
CPU time:       5.6s
CPU Affinity:   yy


[root@vmi20 .libs]# ./virsh vcpupin vm1 0 0

[root@vmi20 .libs]# echo $?
0
[root@vmi20 .libs]# 
[root@vmi20 .libs]# 
[root@vmi20 .libs]# xm vcpu-list vm1
Name                              ID VCPUs   CPU State   Time(s) CPU Affinity
vm1                  1     0     0   -b-       8.4 any cpu
vm1                  1     1     0   -b-       5.6 any cpu
[root@vmi20 .libs]# ./virsh vcpuinfo vm1
VCPU:           0
CPU:            0
State:          idle
CPU time:       8.4s
CPU Affinity:   yy

VCPU:           1
CPU:            0
State:          idle
CPU time:       5.6s
CPU Affinity:   yy



(3)  command end with show error msg.
[root@vmi20 .libs]# xm vcpu-list vm1
Error: Domain 'vm1' does not exist.
Usage: xm vcpu-list [<Domain>]

List the VCPUs for a domain or all domains.
[root@vmi20 .libs]# 
[root@vmi20 .libs]# ./virsh vcpuinfo vm1
error: Domain shut off, virtual CPUs not present.

[root@vmi20 .libs]# ./virsh vcpupin vm1 0 0
error: POST operation failed: xend_post: error from xen daemon: No such domain vm1

[root@vmi20 .libs]# xm vcpu-list vm1
Error: Domain 'vm1' does not exist.
Usage: xm vcpu-list [<Domain>]

List the VCPUs for a domain or all domains.
[root@vmi20 .libs]# ./virsh vcpuinfo vm1
error: Domain shut off, virtual CPUs not present.



(4)  command end normaly but can't set cpu affnity.
[root@vmi20 .libs]# xm vcpu-list vm1
Name                              ID VCPUs   CPU State   Time(s) CPU Affinity
vm1                  2     0     0   ---       3.1 any cpu
vm1                  2     1     0   r--       3.7 any cpu
[root@vmi20 .libs]# ./virsh vcpuinfo vm1
VCPU:           0
CPU:            0
State:          idle
CPU time:       4.6s
CPU Affinity:   yy

VCPU:           1
CPU:            0
State:          idle
CPU time:       5.0s
CPU Affinity:   yy

[root@vmi20 .libs]# ./virsh vcpupin vm1 0 0

[root@vmi20 .libs]# echo $?
0
[root@vmi20 .libs]# xm vcpu-list vm1
Name                              ID VCPUs   CPU State   Time(s) CPU Affinity
vm1                  2     0     1   -b-       6.5 any cpu
vm1                  2     1     1   -b-       5.9 any cpu
[root@vmi20 .libs]# 
[root@vmi20 .libs]# 
[root@vmi20 .libs]# ./virsh vcpuinfo vm1
VCPU:           0
CPU:            1
State:          idle
CPU time:       6.5s
CPU Affinity:   yy

VCPU:           1
CPU:            1
State:          idle
CPU time:       5.9s
CPU Affinity:   yy