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, 3 insertions, 0 deletions

diff --git a/hw/boards.h b/hw/boards.h
index f6733b7cc9..11acb89fce 100644
--- a/hw/boards.h
+++ b/hw/boards.h
@@ -3,6 +3,8 @@
 #ifndef HW_BOARDS_H
 #define HW_BOARDS_H
 
+#include "qdev.h"
+
 typedef void QEMUMachineInitFunc(ram_addr_t ram_size,
                                  const char *boot_device,
                                  const char *kernel_filename,
@@ -17,6 +19,7 @@ typedef struct QEMUMachine {
     int use_scsi;
     int max_cpus;
     int is_default;
+    CompatProperty *compat_props;
     struct QEMUMachine *next;
 } QEMUMachine;