s390x: introduce 3.1 compat machine

Reviewed-by: NDavid Hildenbrand <david@redhat.com>
Signed-off-by: NCornelia Huck <cohuck@redhat.com>

hw/s390x/s390-virtio-ccw.c

@@ -673,6 +673,9 @@ bool css_migration_enabled(void)
     }                                                                         \
     type_init(ccw_machine_register_##suffix)
 
+#define CCW_COMPAT_3_0 \
+        HW_COMPAT_3_0
+
 #define CCW_COMPAT_2_12 \
         HW_COMPAT_2_12
 
@@ -761,14 +764,26 @@ bool css_migration_enabled(void)
             .value    = "0",\
         },
 
+static void ccw_machine_3_1_instance_options(MachineState *machine)
+{
+}
+
+static void ccw_machine_3_1_class_options(MachineClass *mc)
+{
+}
+DEFINE_CCW_MACHINE(3_1, "3.1", true);
+
 static void ccw_machine_3_0_instance_options(MachineState *machine)
 {
+    ccw_machine_3_1_instance_options(machine);
 }
 
 static void ccw_machine_3_0_class_options(MachineClass *mc)
 {
+    ccw_machine_3_1_class_options(mc);
+    SET_MACHINE_COMPAT(mc, CCW_COMPAT_3_0);
 }
-DEFINE_CCW_MACHINE(3_0, "3.0", true);
+DEFINE_CCW_MACHINE(3_0, "3.0", false);
 
 static void ccw_machine_2_12_instance_options(MachineState *machine)
 {

include/hw/compat.h

 #ifndef HW_COMPAT_H
 #define HW_COMPAT_H
 
+#define HW_COMPAT_3_0 \
+    /* empty */
+
 #define HW_COMPAT_2_12 \
     {\
         .driver   = "migration",\