qdev/compat: compat property infrastructure.

This add support for switching devices into a compatibility mode
using device properties.  Machine types can have a list of properties
for specific devices attached to allow the easy creation of machine
types compatible to older qemu versions.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/hw/qdev.h b/hw/qdev.h
index 9ecc9ec156..a8a4bcb2e7 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -8,6 +8,8 @@ typedef struct Property Property;
 
 typedef struct PropertyInfo PropertyInfo;
 
+typedef struct CompatProperty CompatProperty;
+
 typedef struct DeviceInfo DeviceInfo;
 
 typedef struct BusState BusState;
@@ -68,6 +70,12 @@ struct PropertyInfo {
     int (*print)(DeviceState *dev, Property *prop, char *dest, size_t len);
 };
 
+struct CompatProperty {
+    const char *driver;
+    const char *property;
+    const char *value;
+};
+
 /*** Board API.  This should go away once we have a machine config file.  ***/
 
 DeviceState *qdev_create(BusState *bus, const char *name);
@@ -147,4 +155,7 @@ void qdev_prop_set_uint32(DeviceState *dev, const char *name, uint32_t value);
 void qdev_prop_set_ptr(DeviceState *dev, const char *name, void *value);
 void qdev_prop_set_defaults(DeviceState *dev, Property *props);
 
+void qdev_prop_register_compat(CompatProperty *props);
+void qdev_prop_set_compat(DeviceState *dev);
+
 #endif