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When a domain needs an access to some device (be it a disk, RNG, chardev, whatever), we have to allow it in the devices CGroup (if it is available), because by default we disallow all the devices. But some of the functions that are responsible for setting up devices CGroup are lacking check whether there is any CGroup available. Thus users might be unable to hotplug some devices: virsh # attach-device fedora rng.xml error: Failed to attach device from rng.xml error: internal error: Controller 'devices' is not mounted Signed-off-by: Michal Privoznik <mprivozn@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>