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The existing virNodeDeviceDettach() assumes that there is only a single PCI device assignment backend driver appropriate for any hypervisor. This is no longer true, as the qemu driver is getting support for PCI device assignment via VFIO. The new API virNodeDeviceDetachFlags adds a driverName arg that should be set to the exact same string set in a domain <hostdev>'s <driver name='x'/> element (i.e. "vfio", "kvm", or NULL for default). It also adds a flags arg for good measure (and because it's possible we may need it when we start dealing with VFIO's "device groups").
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>