digraph gph {
	/* Guest state changes on resident pages */
	Ur -> Sr [ label="set stable" ];
	Ur -> Vr [ label="set volatile\n(w=0)" ];
	Ur -> Pr [ label="set volatile\n(w=1)" ];

	Sr -> Ur [ label="set unused" ];
	Sr -> Vr [ label="set volatile\n(w=0)" ];
	Sr -> Pr [ label="set volatile\n(w=1)" ];

	Vr -> Sr [ label="set stable(_if_present)" ];
	Vr -> Ur [ label="set unused" ];
	Vr -> Pr [ label="set volatile\n(w=1)" ];

	Pr -> Sr [ label="set stable(_if_present)" ];
	Pr -> Vr [ label="set volatile\n(w=0)" ];
	Pr -> Ur [ label="set unused" ];

	/* Guest state changes on zero pages */
	Uz -> Sz [ label="set stable" ];
	Uz -> Vz [ label="set volatile" ];

	Sz -> Vz [ label="set volatile" ];
	Sz -> Uz [ label="set unused" ];

	Vz -> Sz [ label="set stable" ];
	Vz -> Uz [ label="set unused" ];

	/* Guest state changes on host-swapped pages */
	Sp -> Uz [ label="set unused" ];
	Sp -> Vz [ label="set volatile" ];

	/* Guest touches pages */
	Sz -> Sr [ label="guest write" ];
	Sp -> Sr [ label="guest access" ];
	Vz -> Vr [ label="guest write" ];

	/* Host actions */
	Sr -> Sp [ label="host swap", style=dashed ];
	Ur -> Uz [ label="host discard", style=dashed ];
	Vr -> Vz [ label="host discard", style=dashed ];
	Pr -> Sp [ label="host discard\n(dirty)", style=dashed ];
	Pr -> Vz [ label="host discard\n(clean)", style=dashed ];
}