ppc: spapr: add 2.4 machine type

The following patches will limit the following things to legacy
machine type:

- maximum number of virtqueues for virtio-pci were limited to 64

Cc: Alexander Graf <agraf@suse.de>
Cc: qemu-ppc@nongnu.org
Signed-off-by: NJason Wang <jasowang@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: NAlexander Graf <agraf@suse.de>

hw/ppc/spapr.c

@@ -1825,8 +1825,13 @@ static const TypeInfo spapr_machine_info = {
 #define SPAPR_COMPAT_2_1 \
         SPAPR_COMPAT_2_2
 
+static void spapr_compat_2_3(Object *obj)
+{
+}
+
 static void spapr_compat_2_2(Object *obj)
 {
+    spapr_compat_2_3(obj);
 }
 
 static void spapr_compat_2_1(Object *obj)
@@ -1834,6 +1839,12 @@ static void spapr_compat_2_1(Object *obj)
     spapr_compat_2_2(obj);
 }
 
+static void spapr_machine_2_3_instance_init(Object *obj)
+{
+    spapr_compat_2_3(obj);
+    spapr_machine_initfn(obj);
+}
+
 static void spapr_machine_2_2_instance_init(Object *obj)
 {
     spapr_compat_2_2(obj);
@@ -1893,14 +1904,29 @@ static void spapr_machine_2_3_class_init(ObjectClass *oc, void *data)
 
     mc->name = "pseries-2.3";
     mc->desc = "pSeries Logical Partition (PAPR compliant) v2.3";
-    mc->alias = "pseries";
-    mc->is_default = 1;
 }
 
 static const TypeInfo spapr_machine_2_3_info = {
     .name          = TYPE_SPAPR_MACHINE "2.3",
     .parent        = TYPE_SPAPR_MACHINE,
     .class_init    = spapr_machine_2_3_class_init,
+    .instance_init = spapr_machine_2_3_instance_init,
+};
+
+static void spapr_machine_2_4_class_init(ObjectClass *oc, void *data)
+{
+    MachineClass *mc = MACHINE_CLASS(oc);
+
+    mc->name = "pseries-2.4";
+    mc->desc = "pSeries Logical Partition (PAPR compliant) v2.4";
+    mc->alias = "pseries";
+    mc->is_default = 1;
+}
+
+static const TypeInfo spapr_machine_2_4_info = {
+    .name          = TYPE_SPAPR_MACHINE "2.4",
+    .parent        = TYPE_SPAPR_MACHINE,
+    .class_init    = spapr_machine_2_4_class_init,
 };
 
 static void spapr_machine_register_types(void)
@@ -1909,6 +1935,7 @@ static void spapr_machine_register_types(void)
     type_register_static(&spapr_machine_2_1_info);
     type_register_static(&spapr_machine_2_2_info);
     type_register_static(&spapr_machine_2_3_info);
+    type_register_static(&spapr_machine_2_4_info);
 }
 
 type_init(spapr_machine_register_types)