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9eb9106ea5
Add support for using the new approach to hotplug vcpus using device_add during startup of qemu to allow sparse vcpu topologies. There are a few limitations imposed by qemu on the supported configuration: - vcpu0 needs to be always present and not hotpluggable - non-hotpluggable cpus need to be ordered at the beginning - order of the vcpus needs to be unique for every single hotpluggable entity Qemu also doesn't really allow to query the information necessary to start a VM with the vcpus directly on the commandline. Fortunately they can be hotplugged during startup. The new hotplug code uses the following approach: - non-hotpluggable vcpus are counted and put to the -smp option - qemu is started - qemu is queried for the necessary information - the configuration is checked - the hotpluggable vcpus are hotplugged - vcpus are started This patch adds a lot of checking code and enables the support to specify the individual vcpu element with qemu.
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>