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docs: Add documentation for compat mode.

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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>
This commit is contained in:
Prerna Saxena 2014-11-04 23:00:36 +05:30 committed by Michal Privoznik
parent 1e91174228
commit 9265fd19b6
1 changed files with 14 additions and 1 deletions
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15
docs/formatdomain.html.in
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@ -1047,7 +1047,20 @@
(such as CPUID level) that don't work. Until these issues are fixed, (such as CPUID level) that don't work. Until these issues are fixed,
it's a good idea to avoid using <code>host-model</code> and use it's a good idea to avoid using <code>host-model</code> and use
<code>custom</code> mode with just the CPU model from host <code>custom</code> mode with just the CPU model from host
capabilities XML.</dd> capabilities XML.
<span class="since">(Since 1.2.11)</span>. PowerISA allows
processors to run VMs in binary compatibility mode supporting an
older version of ISA. Libvirt on PowerPC architecture uses the
<code>host-model</code> to signify a guest mode CPU running in
binary compatibility mode. Example:
When a user needs a power7 VM to run in compatibility mode
on a Power8 host, this can be described in XML as follows :
<pre>
&lt;cpu mode='host-model'&gt;
&lt;model&gt;power7&lt;/model&gt;
&lt;/cpu&gt;
...</pre>
</dd>
<dt><code>host-passthrough</code></dt> <dt><code>host-passthrough</code></dt>
<dd>With this mode, the CPU visible to the guest should be exactly <dd>With this mode, the CPU visible to the guest should be exactly
the same as the host CPU even in the aspects that libvirt does not the same as the host CPU even in the aspects that libvirt does not