feat(rme): test access outside PAR from Plane N

Signed-off-by: Javier Almansa Sobrino <javier.almansasobrino@arm.com>
Change-Id: I3c5069e14fdf27e6c36bd1e0651ceff4ee7396ef
diff --git a/realm/realm_plane.c b/realm/realm_plane.c
index 656c688..a29a1ca 100644
--- a/realm/realm_plane.c
+++ b/realm/realm_plane.c
@@ -150,6 +150,10 @@
 			ret = realm_exit_to_host_as_plane_n(HOST_CALL_EXIT_PRINT_CMD, plane_index);
 			run->enter.gprs[0] = ret;
 			return PSI_RETURN_TO_PN;
+		case PSI_CALL_EXIT_SUCCESS_CMD:
+		case PSI_CALL_EXIT_FAILED_CMD:
+			run->exit.gprs[0] = hvc_id;
+			return PSI_RETURN_TO_P0;
 		case PSI_P0_CALL:
 		default:
 			return PSI_RETURN_TO_P0;
@@ -207,8 +211,8 @@
 
 		ret = handle_plane_exit(plane_index, perm_index, run);
 
-		if (ret != PSI_RETURN_TO_PN) {
-			return true;
+		if (ret == PSI_RETURN_TO_P0) {
+			return !(run->exit.gprs[0] == PSI_CALL_EXIT_FAILED_CMD);
 		}
 	}
 }