无法直接从VM中拔除vCPU， 但您可以通过关闭VM后再拔除vCPU；

[root@test-kvm ~]# virsh list --all   Id    Name                           State  ----------------------------------------------------   1     generic                        running   10    centos7                        running  [root@test-kvm ~]# virsh setvcpus centos7 1  error: unsupported configuration: failed to find appropriate hotpluggable vcpus to reach the desired target vcpu count  [root@test-kvm log]# virsh setvcpus --config centos7 1  [root@test-kvm log]# virsh destroy centos7  Domain centos7 destroyed  [root@test-kvm log]# virsh start centos7  Domain centos7 started  [root@test-kvm log]# virsh dominfo centos7  Id:             11  Name:           centos7  UUID:           6693189b-0a29-4225-b822-724001270bc0  OS Type:        hvm  State:          running  CPU(s):         1  CPU time:       3.3s  Max memory:     4194304 KiB  Used memory:    4194304 KiB  Persistent:     yes  Autostart:      disable  Managed save:   no  Security model: none  Security DOI:   0