[Qemu-devel] [PATCH RFC 1/2] arm: virt: Add an abstract ARM virt machine type

[Wei Huang <wei@redhat.com>]

In preparation for future ARM virt machine types, this patch creates
an abstract type for all ARM machines. The current machine type in
QEMU (i.e. "virt") is renamed to "virt-2.5", which is similar to other
architectures. For the purpose of backward compatibility, "virt" is
converted to an alias, pointing to "virt-2.5". With this patch,
"qemu -M ?" lists the following virtual machine types:

virt                 QEMU 2.5 ARM Virtual Machine (alias of virt-2.5)
virt-2.5             QEMU 2.5 ARM Virtual Machine

Signed-off-by: Wei Huang <wei@redhat.com>
---
 hw/arm/virt.c | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 44bbbea..ee15301 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -1251,6 +1251,19 @@ static void virt_set_gic_version(Object *obj, const char *value, Error **errp)
     }
 }
 
+static void virt_machine_class_init(ObjectClass *oc, void *data)
+{
+}
+
+static const TypeInfo virt_machine_info = {
+    .name          = TYPE_VIRT_MACHINE,
+    .parent        = TYPE_MACHINE,
+    .abstract      = true,
+    .instance_size = sizeof(VirtMachineState),
+    .class_size    = sizeof(VirtMachineClass),
+    .class_init    = virt_machine_class_init,
+};
+
 static void virt_instance_init(Object *obj)
 {
     VirtMachineState *vms = VIRT_MACHINE(obj);
@@ -1288,7 +1301,9 @@ static void virt_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
 
-    mc->desc = "ARM Virtual Machine",
+    mc->desc = "QEMU 2.5 ARM Virtual Machine";
+    mc->alias = "virt";
+    mc->is_default = 1;
     mc->init = machvirt_init;
     /* Start max_cpus at the maximum QEMU supports. We'll further restrict
      * it later in machvirt_init, where we have more information about the
@@ -1302,16 +1317,15 @@ static void virt_class_init(ObjectClass *oc, void *data)
 }
 
 static const TypeInfo machvirt_info = {
-    .name = TYPE_VIRT_MACHINE,
-    .parent = TYPE_MACHINE,
-    .instance_size = sizeof(VirtMachineState),
+    .name = MACHINE_TYPE_NAME("virt-2.5"),
+    .parent = TYPE_VIRT_MACHINE,
     .instance_init = virt_instance_init,
-    .class_size = sizeof(VirtMachineClass),
     .class_init = virt_class_init,
 };
 
 static void machvirt_machine_init(void)
 {
+    type_register_static(&virt_machine_info);
     type_register_static(&machvirt_info);
 }
 
-- 
1.8.3.1