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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>
38 lines
1.5 KiB
XML
38 lines
1.5 KiB
XML
<cpu mode='custom' match='exact'>
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<arch>x86_64</arch>
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<model fallback='allow'>486</model>
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<feature policy='require' name='svm'/>
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<feature policy='require' name='lahf_lm'/>
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<feature policy='require' name='3dnowext'/>
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<feature policy='require' name='lm'/>
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<feature policy='require' name='nx'/>
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<feature policy='require' name='syscall'/>
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<feature policy='require' name='sse4.1'/>
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<feature policy='require' name='dca'/>
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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='ssse3'/>
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<feature policy='require' name='monitor'/>
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<feature policy='require' name='pni'/>
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<feature policy='require' name='pbe'/>
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<feature policy='require' name='sse2'/>
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<feature policy='require' name='fxsr'/>
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<feature policy='require' name='mmx'/>
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<feature policy='require' name='clflush'/>
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<feature policy='require' name='pse36'/>
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<feature policy='require' name='pat'/>
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<feature policy='require' name='cmov'/>
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<feature policy='require' name='mca'/>
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<feature policy='require' name='pge'/>
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<feature policy='require' name='mtrr'/>
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<feature policy='require' name='sep'/>
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<feature policy='require' name='apic'/>
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<feature policy='require' name='cx8'/>
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<feature policy='require' name='mce'/>
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<feature policy='require' name='pae'/>
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<feature policy='require' name='msr'/>
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<feature policy='require' name='tsc'/>
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<feature policy='require' name='de'/>
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<feature policy='disable' name='vme'/>
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</cpu>
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