qemu: add memfd source type

Add a new memoryBacking source type "memfd", supported by QEMU (when
the capability is available).

A memfd is a specialized anonymous memory kind. As such, an anonymous
source type could be automatically using a memfd. However, there are
some complications when migrating from different memory backends in
qemu (mainly due to the internal object naming at this point, but
there could be more). For now, it is simpler and safer to simply
introduce a new source type "memfd". Eventually, the "anonymous" type
could learn to use memfd transparently in a separate change.

The main benefits are that it doesn't need to create filesystem files,
and it also enforces sealing, providing a bit more safety.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

docs/formatdomain.html.in

@@ -1126,7 +1126,7 @@
     </hugepages>
     <nosharepages/>
     <locked/>
-    <source type="file|anonymous"/>
+    <source type="file|anonymous|memfd"/>
     <access mode="shared|private"/>
     <allocation mode="immediate|ondemand"/>
     <discard/>
@@ -1177,9 +1177,10 @@
         suitable for the specific environment at the same time to mitigate
         the risks described above. <span class="since">Since 1.0.6</span></dd>
        <dt><code>source</code></dt>
-       <dd>Using the <code>type</code> attribute, it's possible to provide
-         "file" to utilize file memorybacking or keep the default
-         "anonymous".</dd>
+       <dd>Using the <code>type</code> attribute, it's possible to
+       provide "file" to utilize file memorybacking or keep the
+       default "anonymous". <span class="since">Since 4.10.0</span>,
+       you may choose "memfd" backing. (QEMU/KVM only)</dd>
        <dt><code>access</code></dt>
        <dd>Using the <code>mode</code> attribute, specify if the memory is
          to be "shared" or "private". This can be overridden per numa node by

docs/schemas/domaincommon.rng

@@ -655,6 +655,7 @@
                   <choice>
                     <value>file</value>
                     <value>anonymous</value>
+                    <value>memfd</value>
                   </choice>
                 </attribute>
               </element>