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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>
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| .. | ||
| x86-baseline-1-result.xml | ||
| x86-baseline-1.xml | ||
| x86-baseline-2-result.xml | ||
| x86-baseline-2.xml | ||
| x86-baseline-incompatible-vendors.xml | ||
| x86-baseline-no-vendor-result.xml | ||
| x86-baseline-no-vendor.xml | ||
| x86-baseline-some-vendors-result.xml | ||
| x86-baseline-some-vendors.xml | ||
| x86-bogus-feature.xml | ||
| x86-bogus-model.xml | ||
| x86-bogus-vendor.xml | ||
| x86-exact-disable2.xml | ||
| x86-exact-disable-extra.xml | ||
| x86-exact-disable.xml | ||
| x86-exact-forbid-extra.xml | ||
| x86-exact-forbid.xml | ||
| x86-exact-force.xml | ||
| x86-exact-require-extra.xml | ||
| x86-exact-require.xml | ||
| x86-exact.xml | ||
| x86-guest-nofallback.xml | ||
| x86-guest.xml | ||
| x86-host-amd-fake.xml | ||
| x86-host-amd.xml | ||
| x86-host-better.xml | ||
| x86-host-better+pentium3-result.xml | ||
| x86-host-better+pentium3,core2duo-result.xml | ||
| x86-host-better+pentium3,pentium3-result.xml | ||
| x86-host-incomp-arch.xml | ||
| x86-host-no-vendor.xml | ||
| x86-host-worse.xml | ||
| x86-host-worse+guest-result.xml | ||
| x86-host.xml | ||
| x86-host+guest-result.xml | ||
| x86-host+guest,model486-result.xml | ||
| x86-host+guest,models-result.xml | ||
| x86-host+guest,models,Penryn-result.xml | ||
| x86-host+guest,models,qemu64-result.xml | ||
| x86-host+guest.xml | ||
| x86-host+min.xml | ||
| x86-host+nehalem-force-result.xml | ||
| x86-host+pentium3.xml | ||
| x86-host+strict-force-extra-result.xml | ||
| x86-min.xml | ||
| x86-nehalem-force.xml | ||
| x86-pentium3-amd.xml | ||
| x86-pentium3.xml | ||
| x86-strict-disable.xml | ||
| x86-strict-force-extra.xml | ||
| x86-strict-full.xml | ||
| x86-strict.xml | ||