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2049ef9942
Currently the QEMU driver creates the VM's cgroup prior to forking, and then uses a virCommand hook to move the child into the cgroup. This won't work with systemd whose APIs do the creation of cgroups + attachment of processes atomically. Fortunately we have a handshake taking place between the QEMU driver and the child process prior to QEMU being exec()d, which was introduced to allow setup of disk locking. By good fortune this synchronization point can be used to enable the QEMU driver to do atomic setup of cgroups removing the use of the hook script. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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>