kvm迁移镜像启动报错

背景说明：
将一台kvm宿主机上的镜像，迁移到另外一台宿主机，启动时报错：

[root@YinHe-KVM-01 vms]# virsh start mycentos
error: Failed to start domain mycentos
error: the CPU is incompatible with host CPU: Host CPU does not provide required features: fma, x2apic, movbe, aes, fsgsbase, bmi1, avx2, smep, bmi2, erms, invpcid

说明：
这是因为两台宿主机的CPU类型不一致导致的，解决方法也很简单，将xml文件中的CPU类型改为与当前宿主机一致即可。

解决方法：

1. 查看当前宿主机的CPU类型

   [root@YinHe-KVM-02 home]# virsh capabilities
   <capabilities>
   
     <host>
       <uuid>4c4c4544-0000-0010-8000-80c04f000000uuid>
       <cpu>
         <arch>x86_64arch>
         <model>Nehalem-IBRSmodel>                            # 当前宿主机CPU类型
         <vendor>Intelvendor>
         <microcode version='39'/>
         <counter name='tsc' frequency='3092837000' scaling='no'/>
         <topology sockets='1' cores='4' threads='1'/>
   

2. 修改xml文件的CPU类型

   <cpu mode='custom' match='exact' check='partial'>
       <model fallback='allow'>Nehalem-IBRSmodel>            # 修改CPU类型
   

3. 重新注册并启动虚拟机

   [root@YinHe-KVM-01 vms]# virsh undefine mycentos
   Domain mycentos has been undefined
   
   [root@YinHe-KVM-01 vms]# virsh define mycentos.xml
   Domain mycentos defined from mycentos.xml
   
   [root@YinHe-KVM-01 vms]# virsh start mycentos
   Domain mycentos started