[Qemu-devel] [PATCH v4 03/10] vl: clean up global property registerations

[Peter Xu <peterx@redhat.com>]

It's not that clear on how the global properties are registered to
global_props (and also its priority relationship). Let's provide a
single function to be called in main() for that, with comment to explain
it a bit.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 vl.c | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/vl.c b/vl.c
index 4452d7a..cdd2ec8 100644
--- a/vl.c
+++ b/vl.c
@@ -2969,6 +2969,25 @@ static int qemu_read_default_config_file(void)
     return 0;
 }
 
+static void user_register_compat_props(void)
+{
+    qemu_opts_foreach(qemu_find_opts("global"),
+                      global_init_func, NULL, NULL);
+}
+
+/*
+ * Note: we should see that these compat properties are actually
+ * having a priority: accel < machine < user. This means e.g. when
+ * user specifies something in "-global", it'll always be used with
+ * highest priority.
+ */
+static void register_global_properties(MachineState *ms)
+{
+    accel_register_compat_props(ms->accelerator);
+    machine_register_compat_props(ms);
+    user_register_compat_props();
+}
+
 int main(int argc, char **argv, char **envp)
 {
     int i;
@@ -4571,11 +4590,11 @@ int main(int argc, char **argv, char **envp)
             exit (i == 1 ? 1 : 0);
     }
 
-    accel_register_compat_props(current_machine->accelerator);
-    machine_register_compat_props(current_machine);
-
-    qemu_opts_foreach(qemu_find_opts("global"),
-                      global_init_func, NULL, NULL);
+    /*
+     * Register all the global properties, including accel properties,
+     * machine properties, and user-specified ones.
+     */
+    register_global_properties(current_machine);
 
     /* This checkpoint is required by replay to separate prior clock
        reading from the other reads, because timer polling functions query
-- 
2.7.4