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During migration, the libxl driver starts a modify job in the begin phase, ending the job in the confirm phase. This is essentially VIR_MIGRATE_CHANGE_PROTECTION semantics, but the driver does not support that flag. Without CHANGE_PROTECTION support, the job would never be terminated in error conditions where migrate confirm phase is not executed. Further attempts to modify the domain would result in failure to acquire a job after LIBXL_JOB_WAIT_TIME. Similar to the qemu driver, end the job in the begin phase. Protecting the domain object across all phases of migration can be done in a future patch adding CHANGE_PROTECTION support.
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>