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/vl.c b/vl.c
index 24173ef..f475693 100644
--- a/vl.c
+++ b/vl.c
@@ -5946,6 +5946,9 @@ int main(int argc, char **argv, char **envp)
 
     module_call_init(MODULE_INIT_DEVICE);
 
+    if (machine->compat_props) {
+        qdev_prop_register_compat(machine->compat_props);
+    }
     machine->init(ram_size, boot_devices,
                   kernel_filename, kernel_cmdline, initrd_filename, cpu_model);