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When QEMU reports failed or cancelled migration, we don't need to send it migrate_cancel QMP command. But in all other error paths, such as if we detect broken connection to a destination daemon or something else happens inside libvirt, we need to explicitly send migrate_cancel command instead of relying on the migration to be implicitly cancelled when destination QEMU is killed. Because we were not doing so, one could end up with a paused domain after failed migration. https://bugzilla.redhat.com/show_bug.cgi?id=1098833
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>