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docs: Add documentation for compat mode.
Add documentation to explain how compat-mode can be invoked with libvirt running on PowerPC architecture. It also mentions that this change is available libvirt 1.2.11 onwards. Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
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@ -1047,7 +1047,20 @@
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(such as CPUID level) that don't work. Until these issues are fixed,
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it's a good idea to avoid using <code>host-model</code> and use
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<code>custom</code> mode with just the CPU model from host
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capabilities XML.</dd>
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capabilities XML.
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<span class="since">(Since 1.2.11)</span>. PowerISA allows
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processors to run VMs in binary compatibility mode supporting an
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older version of ISA. Libvirt on PowerPC architecture uses the
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<code>host-model</code> to signify a guest mode CPU running in
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binary compatibility mode. Example:
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When a user needs a power7 VM to run in compatibility mode
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on a Power8 host, this can be described in XML as follows :
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<pre>
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<cpu mode='host-model'>
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<model>power7</model>
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</cpu>
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...</pre>
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</dd>
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<dt><code>host-passthrough</code></dt>
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<dd>With this mode, the CPU visible to the guest should be exactly
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the same as the host CPU even in the aspects that libvirt does not
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