The problem, that I post here<br>  <a href="http://www.mail-archive.com/libvir-list@redhat.com/msg16154.html">http://www.mail-archive.com/libvir-list@redhat.com/msg16154.html</a><br>and that was solved, comes back in a different way.<br>
<br>Consider a working kvm machine with the following description:<br>...<br> &lt;os&gt;<br>    &lt;type arch=&#39;x86_64&#39;  machine=&#39;pc&#39;&gt;hvm&lt;/type&gt;<br>    &lt;boot dev=&#39;hd&#39;/&gt;<br>  &lt;/os&gt;<br>
...<br>If I delete &quot;machine=&#39;pc&#39;&quot; attribute from &lt;type&gt;, so description becomes<br>...<br> &lt;os&gt;<br>    &lt;type arch=&#39;x86_64&#39;&gt;hvm&lt;/type&gt;<br>    &lt;boot dev=&#39;hd&#39;/&gt;<br>
  &lt;/os&gt;<br>
...<br>then libvirt chooses a machine=&#39;pc-0.11&#39; value (again: qemu API version<br>instead of kvm version) and I get<br>  virsh # start DD<br>  error: Failed to start domain DD<br>  error: internal error unable to start guest: Supported machines are:<br>
  pc         Standard PC (default)<br>  isapc      ISA-only PC<br><br>---<br><br>This problem actually occurs when using virt-manager, see<br><a href="https://www.redhat.com/archives/virt-tools-list/2009-October/msg00037.html">https://www.redhat.com/archives/virt-tools-list/2009-October/msg00037.html</a><br>