[virsh] error: unknown OS type hvm解决办法

今天在linux服务器上编译安装升级了下qemu，升级命令如下：

root@ubuntu:/opt/qemu-2.0.# ./configure  --prefix=/usr/local/ --target-list=x86_64-softmmu

root@ubuntu:/opt/qemu-2.0.# make

root@ubuntu:/opt/qemu-2.0.# make install

顺利编译安装后，去define了一个虚拟机，结果报了如下错误：

root@ubuntu:~# virsh define test.xml

error: Failed to define domain from test.xml

error: unknown OS type hvm

好奇怪，便查看了下domain capabilities，命令：

root@ubuntu:~# virsh capabilities

<capabilities>

  <host>

    <uuid>44454c4c-4e00---b2c04f5a3258</uuid>

    <cpu>

      <arch>x86_64</arch>

      <model>Nehalem</model>

      <vendor>Intel</vendor>

      <topology sockets='' cores='' threads=''/>

      <feature name='rdtscp'/>

      <feature name='dca'/>

      <feature name='xtpr'/>

      <feature name='tm2'/>

      <feature name='est'/>

      <feature name='vmx'/>

      <feature name='ds_cpl'/>

      <feature name='monitor'/>

      <feature name='pbe'/>

      <feature name='tm'/>

      <feature name='ht'/>

      <feature name='ss'/>

      <feature name='acpi'/>

      <feature name='ds'/>

      <feature name='vme'/>

    </cpu>

    <power_management/>

    <migration_features>

      <live/>

      <uri_transports>

        <uri_transport>tcp</uri_transport>

      </uri_transports>

    </migration_features>

    <topology>

      <cells num=''>

        <cell id=''>

          <cpus num=''>

            <cpu id=''/>

            <cpu id=''/>

            <cpu id=''/>

            <cpu id=''/>

          </cpus>

        </cell>

        <cell id=''>

          <cpus num=''>

            <cpu id=''/>

            <cpu id=''/>

            <cpu id=''/>

            <cpu id=''/>

          </cpus>

        </cell>

      </cells>

    </topology>

  </host>

</capabilities>

跟正常情况下相比，发现少了<guest> 段落，下面贴下正常情况下的domain capabilities的情况：

<capabilities>

  <host>

    <uuid>01192eea--cb11-a16c-f9dcbe14b1ee</uuid>

    <cpu>

      <arch>x86_64</arch>

      <model>Westmere</model>

      <vendor>Intel</vendor>

      <topology sockets='' cores='' threads=''/>

      <feature name='invpcid'/>

      <feature name='erms'/>

      <feature name='bmi2'/>

      <feature name='smep'/>

      <feature name='avx2'/>

      <feature name='bmi1'/>

      <feature name='fsgsbase'/>

      <feature name='abm'/>

      <feature name='rdtscp'/>

      <feature name='pdpe1gb'/>

      <feature name='rdrand'/>

      <feature name='f16c'/>

      <feature name='avx'/>

      <feature name='osxsave'/>

      <feature name='xsave'/>

      <feature name='tsc-deadline'/>

      <feature name='movbe'/>

      <feature name='pcid'/>

      <feature name='pdcm'/>

      <feature name='xtpr'/>

      <feature name='fma'/>

      <feature name='tm2'/>

      <feature name='est'/>

      <feature name='vmx'/>

      <feature name='ds_cpl'/>

      <feature name='monitor'/>

      <feature name='dtes64'/>

      <feature name='pclmuldq'/>

      <feature name='pbe'/>

      <feature name='tm'/>

      <feature name='ht'/>

      <feature name='ss'/>

      <feature name='acpi'/>

      <feature name='ds'/>

      <feature name='vme'/>

    </cpu>

    <power_management>

      <suspend_mem/>

      <suspend_disk/>

      <suspend_hybrid/>

    </power_management>

    <migration_features>

      <live/>

      <uri_transports>

        <uri_transport>tcp</uri_transport>

      </uri_transports>

    </migration_features>

    <topology>

      <cells num=''>

        <cell id=''>

          <memory unit='KiB'></memory>

          <cpus num=''>

            <cpu id='' socket_id='' core_id='' siblings='0-1'/>

            <cpu id='' socket_id='' core_id='' siblings='0-1'/>

            <cpu id='' socket_id='' core_id='' siblings='2-3'/>

            <cpu id='' socket_id='' core_id='' siblings='2-3'/>

          </cpus>

        </cell>

      </cells>

    </topology>

    <secmodel>

      <model>none</model>

      <doi></doi>

    </secmodel>

    <secmodel>

      <model>dac</model>

      <doi></doi>

      <baselabel type='kvm'>+:+</baselabel>

      <baselabel type='qemu'>+:+</baselabel>

    </secmodel>

  </host>

  <guest>

    <os_type>hvm</os_type>

    <arch name='i686'>

      <wordsize>32</wordsize>

      <emulator>/usr/bin/qemu-system-i386</emulator>

      <machine canonical='pc-i440fx-trusty' maxCpus='255'>pc</machine>

      <machine maxCpus='255'>pc-0.12</machine>

      <machine maxCpus='255'>pc-1.3</machine>

      <machine maxCpus='255'>pc-q35-1.6</machine>

      <machine canonical='pc-1.0-qemu-kvm' maxCpus='255'>pc-1.0-precise</machine>

      <machine maxCpus='255'>pc-q35-1.5</machine>

      <machine maxCpus='1'>xenpv</machine>

      <machine maxCpus='255'>pc-i440fx-1.6</machine>

      <machine maxCpus='255'>pc-i440fx-1.7</machine>

      <machine maxCpus='255'>pc-0.11</machine>

      <machine maxCpus='255'>pc-0.10</machine>

      <machine maxCpus='255'>pc-1.2</machine>

      <machine maxCpus='1'>isapc</machine>

      <machine maxCpus='255'>pc-q35-1.4</machine>

      <machine maxCpus='128'>xenfv</machine>

      <machine maxCpus='255'>pc-0.15</machine>

      <machine maxCpus='255'>pc-0.14</machine>

      <machine maxCpus='255'>pc-i440fx-1.5</machine>

      <machine canonical='pc-q35-2.0' maxCpus='255'>q35</machine>

      <machine maxCpus='255'>pc-i440fx-1.4</machine>

      <machine maxCpus='255'>pc-1.1</machine>

      <machine maxCpus='255'>pc-q35-1.7</machine>

      <machine canonical='pc-1.0' maxCpus='255'>pc-1.0-qemu-kvm</machine>

      <machine maxCpus='255'>pc-i440fx-2.0</machine>

      <machine maxCpus='255'>pc-0.13</machine>

      <domain type='qemu'>

      </domain>

      <domain type='kvm'>

        <emulator>/usr/bin/qemu-system-i386</emulator>

      </domain>

    </arch>

    <features>

      <cpuselection/>

      <deviceboot/>

      <acpi default='on' toggle='yes'/>

      <apic default='on' toggle='no'/>

      <pae/>

      <nonpae/>

    </features>

  </guest>

  <guest>

    <os_type>hvm</os_type>

    <arch name='x86_64'>

      <wordsize>64</wordsize>

      <emulator>/usr/bin/qemu-system-x86_64</emulator>

      <machine canonical='pc-i440fx-trusty' maxCpus='255'>pc</machine>

      <machine maxCpus='255'>pc-1.3</machine>

      <machine maxCpus='255'>pc-0.12</machine>

      <machine maxCpus='255'>pc-q35-1.6</machine>

      <machine canonical='pc-1.0-qemu-kvm' maxCpus='255'>pc-1.0-precise</machine>

      <machine maxCpus='255'>pc-q35-1.5</machine>

      <machine maxCpus='1'>xenpv</machine>

      <machine maxCpus='255'>pc-i440fx-1.6</machine>

      <machine maxCpus='255'>pc-i440fx-1.7</machine>

      <machine maxCpus='255'>pc-0.11</machine>

      <machine maxCpus='255'>pc-1.2</machine>

      <machine maxCpus='255'>pc-0.10</machine>

      <machine maxCpus='1'>isapc</machine>

      <machine maxCpus='255'>pc-q35-1.4</machine>

      <machine maxCpus='128'>xenfv</machine>

      <machine maxCpus='255'>pc-0.15</machine>

      <machine maxCpus='255'>pc-0.14</machine>

      <machine maxCpus='255'>pc-i440fx-1.5</machine>

      <machine maxCpus='255'>pc-i440fx-1.4</machine>

      <machine canonical='pc-q35-2.0' maxCpus='255'>q35</machine>

      <machine maxCpus='255'>pc-1.1</machine>

      <machine maxCpus='255'>pc-q35-1.7</machine>

      <machine canonical='pc-1.0' maxCpus='255'>pc-1.0-qemu-kvm</machine>

      <machine maxCpus='255'>pc-i440fx-2.0</machine>

      <machine maxCpus='255'>pc-0.13</machine>

      <domain type='qemu'>

      </domain>

      <domain type='kvm'>

        <emulator>/usr/bin/qemu-system-x86_64</emulator>

      </domain>

    </arch>

    <features>

      <cpuselection/>

      <deviceboot/>

      <acpi default='on' toggle='yes'/>

      <apic default='on' toggle='no'/>

    </features>

  </guest>

</capabilities>

这时问题就很明显了，肯定是升级qemu时哪里出现了问题，经过多次尝试，终于发现了原因：我们需要将 qemu-system-x86_64 安装在 /usr/bin/ 目录下才能正常define虚拟机。

然后再次重新编译升级qemu，指定 prefix=/usr/即可，命令如下：

root@ubuntu:/opt/qemu-2.0.# ./configure  --prefix=/usr/ --target-list=x86_64-softmmu

root@ubuntu:/opt/qemu-2.0.# make

root@ubuntu:/opt/qemu-2.0.# make install

然后删除原来/usr/local/bin/目录下残留的qemu-*文件即可。

[virsh] error: unknown OS type hvm解决办法的相关教程结束。