qom: introduce object_register_sugar_prop

Similar to the existing "-rtc driftfix" option, we will convert some
legacy "-machine" command line options to global properties on accelerators.
Because accelerators are not devices, we cannot use qdev_prop_register_global.
Instead, provide a slot in the generic object_compat_props arrays for
command line syntactic sugar.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 3 insertions, 7 deletions

diff --git a/vl.c b/vl.c
index c350eef046..b95c161c1d 100644
--- a/vl.c
+++ b/vl.c
@@ -895,13 +895,9 @@ static void configure_rtc(QemuOpts *opts)
     value = qemu_opt_get(opts, "driftfix");
     if (value) {
         if (!strcmp(value, "slew")) {
-            static GlobalProperty slew_lost_ticks = {
-                .driver   = "mc146818rtc",
-                .property = "lost_tick_policy",
-                .value    = "slew",
-            };
-
-            qdev_prop_register_global(&slew_lost_ticks);
+            object_register_sugar_prop("mc146818rtc",
+                                       "lost_tick_policy",
+                                       "slew");
         } else if (!strcmp(value, "none")) {
             /* discard is default */
         } else {