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Minor 0 is the VFIO container device (/dev/vfio/vfio). On it's own the container does not provide a user with any privileged access. It only supports API version check and extension check ioctls. Only by attaching a VFIO group to the container does it gain any access. Set the mode of the container to allow access. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>