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When PyGrub is used as the bootloader in Xen, it gets passed the first bootable disk. Xend supports a "bootable"-flag for this, which isn't explicitly supported by libvirt. When converting libvirt-xml to xen-sxpr the "bootable"-flag gets implicitly set by xen.xend.XenConfig.device_add() for the first disk (marked as "Compat hack -- mark first disk bootable"). When converting back xen-sxpr to libvirt-xml, the disks are returned in the internal order used by Xend ignoring the "bootable"-flag, which loses the original order. When the domain is then re-defined, the order of disks is changed, which breaks PyGrub, since a different disk gets passed. When converting xen-sxpr to libvirt-xml, use the "bootable"-flag to determine the first disk. This isn't perfect, since several disks can be marked as bootable using the Xend-API, but that is not supported by libvirt. In all known cases relevant to libvirt exactly one disk is marked as bootable. Signed-off-by: Philipp Hahn <hahn@univention.de>
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>