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Currently, we wait for SPICE to migrate in the very same loop where we wait for qemu to migrate. This has a disadvantage of slowing seamless migration down. One one hand, we should not kill the domain until all SPICE data has been migrated. On the other hand, there is no need to wait in the very same loop and hence slowing down 'cont' on the destination. For instance, if users are watching a movie, they can experience the movie to be stopped for a couple of seconds, as processors are not running nor on src nor on dst as libvirt waits for SPICE to migrate. We should move the waiting phase to migration CONFIRM phase.
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>