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Migration is a multi-step process 1. Begin(src) 2. Prepare(dst) 3. Perform(src) 4. Finish(dst) 5. Confirm(src) At step 2, a QEMU process is lauched in the destination to accept the incoming migration. Occasionally the process that is controlling the migration workflow aborts, and fails to call step 4, Finish. This leaves a QEMU process running on the target (albeit with paused CPUs). Unfortunately because step 2 actives a job on the QEMU process, it is unkillable by normal means. By registering the VM for autokill against the src virConnectPtr in step 2, we can ensure that the guest is forcefully killed off if the connection is closed without step 4 being invoked * src/qemu/qemu_migration.c: Register autokill in PrepareDirect and PrepareTunnel. Unregister autokill on successful run of Finish * src/qemu/qemu_process.c: Unregister autokill when stopping a process
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>