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To allow unplugging the vcpus, hotplugging of vcpus on platforms which require to plug multiple logical vcpus at once or plugging them in an arbitrary order it's necessary to use the new device_add interface for vcpu hotplug. This patch adds support for the device_add interface using the old setvcpus API by implementing an algorithm to select the appropriate entities to plug in.
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>