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This controller can be connected only to a pcie-root-port or a pcie-switch-downstream-port (which will be added in a later patch), which is the reason for the new connect type VIR_PCI_CONNECT_TYPE_PCIE_PORT. A pcie-switch-upstream-port provides 32 ports (slot=0 to slot=31) on the downstream side, which can only have pci controllers of model "pcie-switch-downstream-port" plugged into them, which is the reason for the other new connect type VIR_PCI_CONNECT_TYPE_PCIE_SWITCH.
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>