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If you take a checkpoint snapshot of a running domain, then pause qemu, then restore the snapshot, the result should be a running domain, but the code was leaving things paused. Furthermore, if you take a checkpoint of a paused domain, then run, then restore, there was a brief but non-deterministic window of time where the domain was running rather than paused. Fix both of these discrepancies by always pausing before restoring. Also, check that the VM is active every time lock is dropped between two monitor calls. Finally, straighten out the events that get emitted on each transition. * src/qemu/qemu_driver.c (qemuDomainRevertToSnapshot): Always pause before reversion, and improve events.
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>