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If the config for a device has specified <driver name='vfio'/>, "backend" in the pci part of the hostdev object will be set to ..._VFIO. In this case, when creating a virPCIDevice set the stubDriver to "vfio-pci", otherwise set it to "pci-stub". We will rely on the lower levels to report an error if the vfio driver isn't loaded. The detach/attach functions in virpci.c will pay attention to the stubDriver setting in the device, and bind/unbind the appropriate driver when preparing hostdevs for the domain. Note that we don't yet attempt to do anything to mark active any other devices in the same vfio "group" as a single device that is being marked active. We do need to do that, but in order to get basic VFIO functionality testing sooner rather than later, initially we'll just live with more cryptic errors when someone tries to do that.
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>