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The mode can be either of "custom" (default), "host-model",
"host-passthrough". The semantics of each mode is described in the
following examples:
- guest CPU is a default model with specified topology:
<cpu>
<topology sockets='1' cores='2' threads='1'/>
</cpu>
- guest CPU matches selected model:
<cpu mode='custom' match='exact'>
<model>core2duo</model>
</cpu>
- guest CPU should be a copy of host CPU as advertised by capabilities
XML (this is a short cut for manually copying host CPU specification
from capabilities to domain XML):
<cpu mode='host-model'/>
In case a hypervisor does not support the exact host model, libvirt
automatically falls back to a closest supported CPU model and
removes/adds features to match host. This behavior can be disabled by
<cpu mode='host-model'>
<model fallback='forbid'/>
</cpu>
- the same as previous returned by virDomainGetXMLDesc with
VIR_DOMAIN_XML_UPDATE_CPU flag:
<cpu mode='host-model' match='exact'>
<model fallback='allow'>Penryn</model> --+
<vendor>Intel</vendor> |
<topology sockets='2' cores='4' threads='1'/> + copied from
<feature policy='require' name='dca'/> | capabilities XML
<feature policy='require' name='xtpr'/> |
... --+
</cpu>
- guest CPU should be exactly the same as host CPU even in the aspects
libvirt doesn't model (such domain cannot be migrated unless both
hosts contain exactly the same CPUs):
<cpu mode='host-passthrough'/>
- the same as previous returned by virDomainGetXMLDesc with
VIR_DOMAIN_XML_UPDATE_CPU flag:
<cpu mode='host-passthrough' match='minimal'>
<model>Penryn</model> --+ copied from caps
<vendor>Intel</vendor> | XML but doesn't
<topology sockets='2' cores='4' threads='1'/> | describe all
<feature policy='require' name='dca'/> | aspects of the
<feature policy='require' name='xtpr'/> | actual guest CPU
... --+
</cpu>
87 lines
3.0 KiB
XML
87 lines
3.0 KiB
XML
<domain type='qemu'>
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<name>f14</name>
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<uuid>553effab-b5e1-2d80-dfe3-da4344826c43</uuid>
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<memory>1048576</memory>
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<currentMemory>1048576</currentMemory>
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<vcpu>2</vcpu>
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<os>
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<type arch='i686' machine='pc'>hvm</type>
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<boot dev='cdrom'/>
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<boot dev='hd'/>
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<bootmenu enable='yes'/>
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</os>
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<features>
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<acpi/>
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<apic/>
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<pae/>
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</features>
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<cpu mode='custom' match='exact'>
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<model fallback='allow'>core2duo</model>
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<vendor>Intel</vendor>
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<topology sockets='1' cores='2' threads='1'/>
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<feature policy='require' name='lahf_lm'/>
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<feature policy='require' name='xtpr'/>
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<feature policy='require' name='cx16'/>
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<feature policy='require' name='tm2'/>
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<feature policy='require' name='est'/>
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<feature policy='require' name='vmx'/>
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<feature policy='require' name='ds_cpl'/>
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<feature policy='require' name='pbe'/>
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<feature policy='require' name='tm'/>
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<feature policy='require' name='ht'/>
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<feature policy='require' name='ss'/>
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<feature policy='require' name='acpi'/>
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<feature policy='require' name='ds'/>
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</cpu>
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<clock offset='utc'/>
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<on_poweroff>destroy</on_poweroff>
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<on_reboot>restart</on_reboot>
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<on_crash>restart</on_crash>
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<devices>
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<emulator>/./qemu.sh</emulator>
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<disk type='file' device='disk'>
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<driver name='qemu' type='qcow2'/>
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<source file='/var/lib/libvirt/images/f14.img'/>
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<target dev='vda' bus='virtio'/>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
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</disk>
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<disk type='file' device='cdrom'>
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<driver name='qemu' type='raw'/>
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<source file='/var/lib/libvirt/Fedora-14-x86_64-Live-KDE.iso'/>
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<target dev='hdc' bus='ide'/>
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<readonly/>
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<address type='drive' controller='0' bus='1' unit='0'/>
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</disk>
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<controller type='ide' index='0'>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
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</controller>
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<controller type='virtio-serial' index='0'>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
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</controller>
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<interface type='ethernet'>
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<mac address='52:54:00:71:70:89'/>
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<script path='/etc/qemu-ifup'/>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
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</interface>
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<serial type='pty'>
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<target port='0'/>
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</serial>
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<console type='pty'>
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<target type='serial' port='0'/>
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</console>
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<input type='tablet' bus='usb'/>
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<input type='mouse' bus='ps2'/>
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<graphics type='spice' port='5900' autoport='no' passwd='sercet' passwdValidTo='2011-05-31T16:11:22' connected='disconnect'/>
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<sound model='ac97'>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
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</sound>
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<video>
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<model type='vga' vram='9216' heads='1'/>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
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</video>
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<memballoon model='virtio'>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
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</memballoon>
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</devices>
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</domain>
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