Paul Durrant writes ("[PATCH v5 3/4] docs: Introduce xenstore paths for hotplug 
features"):
> 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.

Acked-by: Ian Jackson <ian.jack...@eu.citrix.com>

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