libvirt 问题：CPU topology doesn't match maximum vcpu

1. XML 基础配置信息

   <domain type="kvm">

   <uuid>3121eb64-8f58-4f04-b094-6fefc3597d1d</uuid>

   <name>instance-0000026d</name>

   <memory>16777216</memory>

   <vcpu>16</vcpu>

   <metadata>

   <nova:instance xmlns:nova="http://openstack.org/xmlns/libvirt/nova/1.0">;

   <nova:package version="13.1.4-1.el7"/>

   <nova:name>shut-win.vlan1217</nova:name>

   <nova:creationTime>2018-01-08 10:45:24</nova:creationTime>

   <nova:flavor name="windows-16-16G-100G">

   <nova:memory>16384</nova:memory>

   <nova:disk>120</nova:disk>

   <nova:swap>0</nova:swap>

   <nova:ephemeral>0</nova:ephemeral>

   <nova:vcpus>16</nova:vcpus>

   </nova:flavor>

   <nova:owner>

   <nova:user uuid="053d91950deb40d08b706988f4bf914a">sys-admin</nova:user>

   <nova:project uuid="8b79300ff2a546d896ef58a9c8004e68">sys-admin</nova:project>

   </nova:owner>

   <nova:root type="image" uuid="86e30f80-5a93-47ee-88c9-de5c1db6df10"/>

   </nova:instance>

   </metadata>

   <sysinfo type="smbios">

   <system>

   <entry name="manufacturer">Fedora Project</entry>

   <entry name="product">OpenStack Nova</entry>

   <entry name="version">13.1.4-1.el7</entry>

   <entry name="serial">23b8b39c-2dad-4172-a8eb-4c260299ed6c</entry>

   <entry name="uuid">3121eb64-8f58-4f04-b094-6fefc3597d1d</entry>

   <entry name="family">Virtual Machine</entry>

   </system>

   </sysinfo>

   <os>

   <type>hvm</type>

   <boot dev="hd"/>

   <smbios mode="sysinfo"/>

   </os>

   <features>

   <acpi/>

   <apic/>

   <hyperv>

   <relaxed state="on"/>

   <vapic state="on"/>

   <spinlocks retries="8191" state="on"/>

   </hyperv>

   </features>

   <cputune>

   <shares>16384</shares>

   </cputune>

   <clock offset="localtime">

   <timer name="pit" tickpolicy="delay"/>

   <timer name="rtc" tickpolicy="catchup"/>

   <timer name="hpet" present="no"/>

   <timer name="hypervclock" present="yes"/>

   </clock>

   <cpu match="exact">

   <topology sockets="16" cores="16" threads="1"/>

   </cpu>

   <devices>

   <disk type="network" device="disk">

   <driver type="raw" cache="none"/>

   <source protocol="rbd" name="nova_instances/3121eb64-8f58-4f04-b094-6fefc3597d1d_disk">

   <host name="10.168.4.4" port="6789"/>

   <host name="10.168.4.6" port="6789"/>

   <host name="10.168.4.8" port="6789"/>

   </source>

   <auth username="cinder">

   <secret type="ceph" uuid="c8ff7874-ac9d-4897-ae01-b8a29f2c3488"/>

   </auth>

   <target bus="virtio" dev="vda"/>

   <iotune>

   <read_bytes_sec>52428800</read_bytes_sec>

   <write_bytes_sec>52428800</write_bytes_sec>

   </iotune>

   </disk>

   <disk type="network" device="cdrom">

   <source protocol="rbd" name="nova_instances/3121eb64-8f58-4f04-b094-6fefc3597d1d_disk.config">

   <target bus="ide" dev="hdd"/>

   <interface type="bridge">

   <mac address="fa:16:3e:bf:cc:a9"/>

   <model type="virtio"/>

   <source bridge="vlan1217"/>

   </interface>

   <serial type="file">

   <source path="/data/nova/instances/3121eb64-8f58-4f04-b094-6fefc3597d1d/console.log"/>

   </serial>

   <serial type="pty"/>

   <input type="tablet" bus="usb"/>

   <graphics type="vnc" autoport="yes" keymap="en-us" listen="0.0.0.0"/>

   <video>

   <model type="cirrus"/>

   </video>

   <memballoon model="virtio">

   <stats period="10"/>

   </memballoon>

   </devices>

   </domain>

2. Compiled with support for:
    Hypervisors: QEMU/KVM LXC ESX Test
    Networking: Remote Network Bridging Interface netcf Nwfilter VirtualPort
    Storage: Dir Disk Filesystem SCSI Multipath iSCSI LVM RBD Gluster
    Miscellaneous: Daemon Nodedev SELinux Secrets Debug DTrace Readline Modular
   
       [root@l23-4-40 3121eb64-8f58-4f04-b094-6fefc3597d1d]# qemu-img  -V
       qemu-img version 2.9.0(qemu-kvm-ev-2.9.0-16.el7_4.13.1)
       Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers           

3. 1. error: unsupported configuration: CPU topology doesn't match maximum vcpu count 问题解决

      需要在配置里去除 <topology sockets="16" cores="16" threads="1"/> 解决问题

4. ![](http://i2.51cto.com/images/blog/201801/08/1378e5401edf275c682f68fce6d0dd35.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)
   ![](http://i2.51cto.com/images/blog/201801/08/c5fffe42e40f870a31bca90055ce88ea.png?x-oss-process=image/watermark,size_16,text_QDUxQ1RP5Y2a5a6i,color_FFFFFF,t_100,g_se,x_10,y_10,shadow_90,type_ZmFuZ3poZW5naGVpdGk=)           

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