libvirt kvm hidden state fail to validate

Ubuntu 15.04 Fresh new installation so all packages are up to date.

Trying to edit libvirt xml file. Using $ sudo EDITOR=gedit virsh edit win81

Added

<kvm> <hidden state='on'/>
</kvm>

then receive following error message

error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng
Extra element devices in interleave
Element domain failed to validate content

Help please

1 Answer

Your are trying to use a relatively new feature, perhaps it is not yet available in 15.04. It is available in 15.10 development. You can check by looking at /usr/share/libvirt/schemas/domaincommon.rng. Does it contain this:

 <!-- Optional KVM features --> <define name="kvm"> <element name="kvm"> <interleave> <optional> <element name="hidden"> <ref name="featurestate"/> </element> </optional> </interleave> </element> </define>

If the feature is available, then please show us the bigger context of your .xml file. Perhaps edit your question and post the entire <features> section.