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The qemu driver always adds these options to the qemu commandlines, but the commandline parser didn't recognize them, so sending a libvirt-generated qemu commandline to its own argvtoxml would always result in a warning message and a qemu namespace added to the xml. Since the options don't add any functionality to the domain, they should just be ignored (similar to -S). Note that we can't yet add a test for this to qemuargv2xmltest, because we would have to add QEMU_CAPS_NODEFCONFIG and QEMU_CAPS_DEVICE to the capabilities for any corresponding xml2argvtest, and QEMU_CAPS_DEVICE would necessitate having support for parsing a memballoon device in order for qemuargv2xmltest to pass. So we wait to add a test for -nodefconfig and -nodefaults until after adding support for parsing -device virtio-balloon-*.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>