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Without some indication from a guest it is not possible for a toolstack to know whether instantiation of a new vbd or vif should result in a new PV device of the appropriate type being brought online. (In other words whether guest PV drivers are present and functioning). This patch documents two paths which vif and vbd frontend drivers can use to advertise their ability to respond to new vif or vbd instantiations. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Cc: Ian Campbell <ian.campbell@citrix.com> Cc: Ian Jackson <ian.jackson@eu.citrix.com> Cc: Jan Beulich <jbeulich@suse.com> Cc: Keir Fraser <keir@xen.org> Cc: Tim Deegan <tim@xen.org> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>