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The downstream ports of an x3130-upstream switch can each have one of these plugged into them (and that is the only place they can be connected). Each xio3130-downstream provides a single PCIe port that can have PCI or PCIe devices hotplugged into it. Apparently an entire set of x3130-upstream + several xio3130-downstreams can be hotplugged as a unit, but it's not clear to me yet how that would be done, since qemu only allows attaching a single device at a time. This device will be used to implement the "pcie-switch-downstream-port" model of pci controller.
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>