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This controller provides a single PCIe port on a new root. It is similar to pci-expander-bus, intended to provide a bus that can be associated with a guest-identifiable NUMA node, but is for machinetypes with PCIe rather than PCI (e.g. q35-based machinetypes). Aside from PCIe vs. PCI, the other main difference is that a pci-expander-bus has a companion pci-bridge that is automatically attached along with it, but pcie-expander-bus has only a single port, and that port will only connect to a pcie-root-port, or to a pcie-switch-upstream-port. In order for the bus to be of any use in the guest, it must have either a pcie-root-port or a pcie-switch-upstream-port attached (and one or more pcie-switch-downstream-ports attached to the pcie-switch-upstream-port).
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>