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This is backed by the qemu device "pxb". The pxb device always includes a pci-bridge that is at the bus number of the pxb + 1. busNr and <node> from the <target> subelement are used to set the bus_nr and numa_node options for pxb. During post-parse we validate that the domain's machinetype is 440fx-based (since the pxb device only works on 440fx-based machines), and <node> also gets a sanity check to assure that the NUMA node specified for the pxb (if any - it's optional) actually exists on the guest.
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>