On 08/21/2014 03:40 PM, bancfc(a)openmailbox.org wrote: Help us help you: Are you sure your XML has the correct syntax? Can you paste the actual XML you tried and the actual error message you got? What version of libvirt are you using? http://libvirt.org/formatdomain.html#elementsFeatures mentions that pvspinlock exists, but failed to document what version of libvirt added support for it, so maybe we should patch the docs to be more useful. That would be an easy patch for a beginner (add a "since" <span> tag to docs/formatdomain.html.in), would you like to take a stab at it? -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org