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With JSON qemu monitor, we get a STOP event from qemu whenever qemu stops guests CPUs. The downside of it is that vm->state is changed to PAUSED and a new generic paused event is send to applications. However, when we ask qemu to stop the CPUs we are not really interested in qemu event and we usually want to issue a more specific event. By setting vm->status to PAUSED before actually sending the request to qemu (and resetting it back if the request fails) we can ignore the event since the event handler does nothing when the guest is already paused. This solution is quite hacky but unfortunately it's the best solution which I was able to come up with and it doesn't introduce a race condition.
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>