12.9. 验证虚拟机迁移的主机 CPU 兼容性

要使迁移的虚拟机 (VM) 在目标主机上正常工作，源和目标主机上的 CPU 必须兼容。要确保情况如此，请在开始迁移前计算一个常见 CPU 基准。

注意

本节中的说明使用了具有以下主机 CPU 的迁移示例：

源主机：Intel Core i7-8650U
目标主机：Intel Xeon CPU E5-2620 v2

先决条件

已在您的系统中安装并启用虚拟化。
您具有对源主机和迁移的目标主机的管理员访问权限。

流程

在源主机上，获取其 CPU 功能并将其粘贴到新的 XML 文件中，如 domCaps-CPUs.xml。
```
# virsh domcapabilities | xmllint --xpath "//cpu/mode[@name='host-model']" - > domCaps-CPUs.xml
```
在 XML 文件中，将 <mode> </mode> 标签替换为 <cpu> </cpu>。

可选：验证 domCaps-CPUs.xml 文件的内容类似如下：

# cat domCaps-CPUs.xml

    <cpu>
          <model fallback="forbid">Skylake-Client-IBRS</model>
          <vendor>Intel</vendor>
          <feature policy="require" name="ss"/>
          <feature policy="require" name="vmx"/>
          <feature policy="require" name="pdcm"/>
          <feature policy="require" name="hypervisor"/>
          <feature policy="require" name="tsc_adjust"/>
          <feature policy="require" name="clflushopt"/>
          <feature policy="require" name="umip"/>
          <feature policy="require" name="md-clear"/>
          <feature policy="require" name="stibp"/>
          <feature policy="require" name="arch-capabilities"/>
          <feature policy="require" name="ssbd"/>
          <feature policy="require" name="xsaves"/>
          <feature policy="require" name="pdpe1gb"/>
          <feature policy="require" name="invtsc"/>
          <feature policy="require" name="ibpb"/>
          <feature policy="require" name="ibrs"/>
          <feature policy="require" name="amd-stibp"/>
          <feature policy="require" name="amd-ssbd"/>
          <feature policy="require" name="rsba"/>
          <feature policy="require" name="skip-l1dfl-vmentry"/>
          <feature policy="require" name="pschange-mc-no"/>
          <feature policy="disable" name="hle"/>
          <feature policy="disable" name="rtm"/>
    </cpu>

在目标主机上，使用以下命令获取其 CPU 功能：

# virsh domcapabilities | xmllint --xpath "//cpu/mode[@name='host-model']" -

    <mode name="host-model" supported="yes">
            <model fallback="forbid">IvyBridge-IBRS</model>
            <vendor>Intel</vendor>
            <feature policy="require" name="ss"/>
            <feature policy="require" name="vmx"/>
            <feature policy="require" name="pdcm"/>
            <feature policy="require" name="pcid"/>
            <feature policy="require" name="hypervisor"/>
            <feature policy="require" name="arat"/>
            <feature policy="require" name="tsc_adjust"/>
            <feature policy="require" name="umip"/>
            <feature policy="require" name="md-clear"/>
            <feature policy="require" name="stibp"/>
            <feature policy="require" name="arch-capabilities"/>
            <feature policy="require" name="ssbd"/>
            <feature policy="require" name="xsaveopt"/>
            <feature policy="require" name="pdpe1gb"/>
            <feature policy="require" name="invtsc"/>
            <feature policy="require" name="ibpb"/>
            <feature policy="require" name="amd-ssbd"/>
            <feature policy="require" name="skip-l1dfl-vmentry"/>
            <feature policy="require" name="pschange-mc-no"/>
    </mode>

将从目标主机获取的 CPU 功能添加到源主机上的 domCaps-CPUs.xml 文件。同样，将 <mode> </mode> 标签替换为 <cpu> </cpu> 并保存文件。

可选：验证 XML 文件现在是否包含两个主机的 CPU 功能。

# cat domCaps-CPUs.xml

    <cpu>
          <model fallback="forbid">Skylake-Client-IBRS</model>
          <vendor>Intel</vendor>
          <feature policy="require" name="ss"/>
          <feature policy="require" name="vmx"/>
          <feature policy="require" name="pdcm"/>
          <feature policy="require" name="hypervisor"/>
          <feature policy="require" name="tsc_adjust"/>
          <feature policy="require" name="clflushopt"/>
          <feature policy="require" name="umip"/>
          <feature policy="require" name="md-clear"/>
          <feature policy="require" name="stibp"/>
          <feature policy="require" name="arch-capabilities"/>
          <feature policy="require" name="ssbd"/>
          <feature policy="require" name="xsaves"/>
          <feature policy="require" name="pdpe1gb"/>
          <feature policy="require" name="invtsc"/>
          <feature policy="require" name="ibpb"/>
          <feature policy="require" name="ibrs"/>
          <feature policy="require" name="amd-stibp"/>
          <feature policy="require" name="amd-ssbd"/>
          <feature policy="require" name="rsba"/>
          <feature policy="require" name="skip-l1dfl-vmentry"/>
          <feature policy="require" name="pschange-mc-no"/>
          <feature policy="disable" name="hle"/>
          <feature policy="disable" name="rtm"/>
    </cpu>
    <cpu>
          <model fallback="forbid">IvyBridge-IBRS</model>
          <vendor>Intel</vendor>
          <feature policy="require" name="ss"/>
          <feature policy="require" name="vmx"/>
          <feature policy="require" name="pdcm"/>
          <feature policy="require" name="pcid"/>
          <feature policy="require" name="hypervisor"/>
          <feature policy="require" name="arat"/>
          <feature policy="require" name="tsc_adjust"/>
          <feature policy="require" name="umip"/>
          <feature policy="require" name="md-clear"/>
          <feature policy="require" name="stibp"/>
          <feature policy="require" name="arch-capabilities"/>
          <feature policy="require" name="ssbd"/>
          <feature policy="require" name="xsaveopt"/>
          <feature policy="require" name="pdpe1gb"/>
          <feature policy="require" name="invtsc"/>
          <feature policy="require" name="ibpb"/>
          <feature policy="require" name="amd-ssbd"/>
          <feature policy="require" name="skip-l1dfl-vmentry"/>
          <feature policy="require" name="pschange-mc-no"/>
    </cpu>

使用 XML 文件计算您要迁移的虚拟机的 CPU 功能基准。

# virsh hypervisor-cpu-baseline domCaps-CPUs.xml

    <cpu mode='custom' match='exact'>
      <model fallback='forbid'>IvyBridge-IBRS</model>
      <vendor>Intel</vendor>
      <feature policy='require' name='ss'/>
      <feature policy='require' name='vmx'/>
      <feature policy='require' name='pdcm'/>
      <feature policy='require' name='pcid'/>
      <feature policy='require' name='hypervisor'/>
      <feature policy='require' name='arat'/>
      <feature policy='require' name='tsc_adjust'/>
      <feature policy='require' name='umip'/>
      <feature policy='require' name='md-clear'/>
      <feature policy='require' name='stibp'/>
      <feature policy='require' name='arch-capabilities'/>
      <feature policy='require' name='ssbd'/>
      <feature policy='require' name='xsaveopt'/>
      <feature policy='require' name='pdpe1gb'/>
      <feature policy='require' name='invtsc'/>
      <feature policy='require' name='ibpb'/>
      <feature policy='require' name='amd-ssbd'/>
      <feature policy='require' name='skip-l1dfl-vmentry'/>
      <feature policy='require' name='pschange-mc-no'/>
    </cpu>

打开您要迁移的虚拟机 XML 配置，并将 <cpu> 部分的内容替换为上一步中获取的设置。
```
# virsh edit <vm_name>
```
如果虚拟机正在运行，请关闭虚拟机并再次启动它。
```
# virsh shutdown <vm_name>

# virsh start <vm_name>
```

后续步骤

12.9. 验证虚拟机迁移的主机 CPU 兼容性

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