KVM下virtio驱动虚拟机XML配置文件分析

[root@opennebula qemu]# pwd

/etc/libvirt/qemu

[root@opennebula qemu]# ls

networks one-12.xml one-12.xml_bak one-13.xml one-14.xml one-2.xml one-5.xml one-6.xml one-7.xml one-8.xml one-9.xml

[root@opennebula qemu]# virsh dumpxml one-14

<domain type='kvm' id='20'> /*定义类型为kvm和虚拟机ID*/

<name>one-14</name> /*虚拟机名称*/

<uuid>9bde61c4-7d43-dcca-5da6-0be1bf9285d9</uuid> /*uuid由系统自动生成,uuid唯一*/

<memory unit='KiB'>1048576</memory> /*为虚拟机分配的最大内存量*/

<currentMemory unit='KiB'>1048576</currentMemory> /*虚拟机可使用的内存配额，不得大于虚拟机的最大内存量*/

<vcpu placement='static'>4</vcpu> /*为虚拟机分配的VCPU数量*/

<cputune>

<shares>205</shares> /*为虚拟机分配的CPU配额，该值为VCPU占用时间片的量，最小为12(1%)最大为1024(100%)*/

</cputune>

<os>

<type arch='x86_64' machine='rhel6.4.0'>hvm</type> /*虚拟机架构(x86_64orX86_i686),宿主机操作系统*/

<boot dev='hd'/> /*启动设备，可以为多个*/

</os>

<features>

<acpi/> /*处理器特性*/

</features>

<clock offset='utc'/> /*时钟，虚拟机使用UTC时钟*/

<on_poweroff>destroy</on_poweroff> /*关闭虚拟机*/

<on_reboot>restart</on_reboot> /*重启虚拟机*/

<on_crash>destroy</on_crash>

<devices> /*开始定义设备*/

<emulator>/usr/bin/kvm</emulator> /*虚拟机调用的kvm程序*/

<disk type='file' device='disk'> /*加载磁盘*/

<driver name='qemu' type='qcow2'/> /**/

<source file='/srv/cloud/one/var//datastores/0/14/disk.0'/> /*加载第一个磁盘*/

<target dev='hda' bus='virtio'/> /*硬盘驱动器使用virtio驱动*/

<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> /*硬盘使用virtio驱动后识别为pci总线*/

</disk>

<disk type='file' device='cdrom'> /*加载光驱*/

<driver name='qemu' type='raw'/>

<source file='/srv/cloud/one/var//datastores/win2k3.iso'/>

<target dev='hdb' bus='ide'/>

<readonly/> /*光驱为只读*/

<address type='drive' controller='0' bus='0' unit='1'/>

</disk>

<controller type='usb' index='0'>

<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>

</controller>

<controller type='ide' index='0'>

<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>

</controller>

<interface type='bridge'> /*网络接口类型为桥接*/

<mac address='02:00:c0:a8:64:a0'/> /*MAC地址*/

<source bridge='vSwitch'/> /*桥接的网卡*/

<model type='virtio'/> /*使用virtio模式，网卡工作速率为1000M*/

<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>

</interface> /*鼠标类型*/

<input type='mouse' bus='usb'>

<input type='mouse' bus='ps2'/>

<graphics type='vnc' port='5914' autoport='no' listen='0.0.0.0' passwd='123456'> /*VNC连接配置*/

<listen type='address' address='0.0.0.0'/>

</graphics>

<video>

<model type='cirrus' vram='9216' heads='1'/>

<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>

</video>

<memballoon model='virtio'>

<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>

</memballoon>

</devices>

<seclabel type='none'/>

</domain>

[root@opennebula qemu]#