[Qemu-devel] [PATCH] arm: define version-based machine type for ARM

[Wei Huang <wei@redhat.com>]

ARM virt machine type (machvirt) had been stable for a while. But recently
new devices have been added to support extra features. Considerring the
support of long-term compatibility, it is time to create a version-based
machine types.

This patch defines a qemu 2.2 specific machine type (machvirt-2.2) and
points the default machvirt to it. In the future new machine types can
follow a similar naming scheme (e.g. machvirt-3.0, ...). Note that this
patch doesn't change the semantic of existing QEMU command line.

With this patch, machine type querry (-M ?) will print the following:

virt                 ARM Virtual Machine v2.2 (alias of machvirt-2.2)
machvirt-2.2         ARM Virtual Machine v2.2 (default)

Signed-off-by: Wei Huang <wei@redhat.com>
---
 hw/arm/virt.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 2353440..6174abd 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -701,15 +701,37 @@ static void virt_class_init(ObjectClass *oc, void *data)
 static const TypeInfo machvirt_info = {
     .name = TYPE_VIRT_MACHINE,
     .parent = TYPE_MACHINE,
+    .abstract = true,
     .instance_size = sizeof(VirtMachineState),
     .instance_init = virt_instance_init,
     .class_size = sizeof(VirtMachineClass),
     .class_init = virt_class_init,
 };
 
+static void machvirt_2_2_class_init(ObjectClass *oc, void *data)
+{
+    MachineClass *mc = MACHINE_CLASS(oc);
+    static GlobalProperty compat_props[] = {
+        { /* end of list */ }
+    };
+
+    mc->name = "machvirt-2.2";
+    mc->desc = "ARM Virtual Machine v2.2";
+    mc->alias = "virt";
+    mc->is_default = 1;
+    mc->compat_props = compat_props;
+}
+
+static const TypeInfo machvirt_2_2_info = {
+    .name = TYPE_VIRT_MACHINE "-2.2",
+    .parent = TYPE_VIRT_MACHINE,
+    .class_init = machvirt_2_2_class_init,
+};
+
 static void machvirt_machine_init(void)
 {
     type_register_static(&machvirt_info);
+    type_register_static(&machvirt_2_2_info);
 }
 
 machine_init(machvirt_machine_init);
-- 
1.8.3.1