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A minimal implementation of the Viridian (Hyper-V) guest interface. The only enlightenments advertised and supported are vAPIC MSRs and long-spin-wait notifications. The set of enlightenments can easily be extended in future, as they are found to provide a performance win, and configured via an extended HVM_PARAM_VIRIDIAN hvm parameter. Signed-off-by: Peter Johnston <peter.johnston@citrix.com> Signed-off-by: Tim Deegan <tim.deegan@citrix.com> Signed-off-by: Keir Fraser <keir.fraser@citrix.com>