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docs: Enhance documentation of CPU models in domain caps

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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
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Jiri Denemark 2022-10-07 18:16:09 +02:00
parent ed51d2b606
commit d4975a98b6
1 changed files with 14 additions and 4 deletions
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docs/formatdomaincaps.rst
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@ -222,10 +222,20 @@ more details about it:
``custom``
The ``mode`` element contains a list of supported CPU models, each described
by a dedicated ``model`` element. The ``usable`` attribute specifies whether
the model can be used directly on the host. When usable='no' the
corresponding model cannot be used without disabling some features that the
CPU of such model is expected to have. A special value ``unknown`` indicates
libvirt does not have enough information to provide the usability data. The
the model can be used directly on the host. A special value ``unknown``
indicates libvirt does not have enough information to provide the usability
data. When ``usable='no'`` the corresponding model cannot be used without
disabling some features that the CPU of such model is expected to have. The
list of features blocking usability of a particular CPU model is returned
as disabled features in the result of ``virConnectBaselineHypervisorCPU``
API (or ``virsh hypervisor-cpu-baseline``) when called on a CPU definition
using the CPU model and no additional feature elements. Models marked as
usable (``usable='yes'``) can be safely used in domain XMLs with
``check='none'`` as the hypervisor guarantees the model can be used on the
current host and additional checks done by libvirt are redundant. In fact,
disabling libvirt checks via ``check='none'`` for such models is recommended
to avoid needless issues with starting domains when libvirt's definition of
a particular model differs from hypervisor's definition. The
``deprecated`` attribute reflects the hypervisor's policy on usage of this
model :since:`(since 7.1.0)`. The ``vendor`` attribute :since:`(since 8.9.0)`
contains the vendor of the CPU model for users who want to use CPU models