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Currently, boot order can be specified per device class but there is no way to specify exact disk/NIC device to boot from. This patch adds <boot order='N'/> element which can be used inside <disk/> and <interface/>. This is incompatible with the older os/boot element. Since not all hypervisors support per-device boot specification, new deviceboot flag is included in capabilities XML for hypervisors which understand the new boot element. Presence of the flag allows (but doesn't require) users to use the new style boot order specification.
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>