[Qemu-devel] [PATCH v4 02/10] accel: introduce AccelClass.global_props

[Peter Xu <peterx@redhat.com>]

Introduce this new field for the accelerator classes so that each
specific accelerator in the future can register its own global
properties to be used further by the system. It works just like how the
old machine compatible properties do, but only tailored for
accelerators.

Use the newly exported register_compat_prop() to pass the accelerator
global properties to the global_props list.

Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 accel/accel.c          | 10 ++++++++++
 include/sysemu/accel.h | 10 ++++++++++
 vl.c                   |  1 +
 3 files changed, 21 insertions(+)

diff --git a/accel/accel.c b/accel/accel.c
index 7c079a5..212581c 100644
--- a/accel/accel.c
+++ b/accel/accel.c
@@ -120,6 +120,16 @@ void configure_accelerator(MachineState *ms)
     }
 }
 
+void accel_register_compat_props(AccelState *accel)
+{
+    AccelClass *class = ACCEL_GET_CLASS(accel);
+    GlobalProperty *prop;
+
+    for (prop = class->global_props; prop && prop->driver; prop++) {
+        register_compat_prop(prop->driver, prop->property, prop->value);
+    }
+}
+
 static void register_accel_types(void)
 {
     type_register_static(&accel_type);
diff --git a/include/sysemu/accel.h b/include/sysemu/accel.h
index 15944c1..8a01e51 100644
--- a/include/sysemu/accel.h
+++ b/include/sysemu/accel.h
@@ -24,6 +24,7 @@
 #define HW_ACCEL_H
 
 #include "qom/object.h"
+#include "hw/qdev-properties.h"
 
 typedef struct AccelState {
     /*< private >*/
@@ -40,6 +41,13 @@ typedef struct AccelClass {
     int (*available)(void);
     int (*init_machine)(MachineState *ms);
     bool *allowed;
+    /*
+     * Array of gobal properties that would be applied when specific
+     * accelerator is chosen. It works just like
+     * MachineClass.compat_props but it's for accelerators not
+     * machines.
+     */
+    GlobalProperty *global_props;
 } AccelClass;
 
 #define TYPE_ACCEL "accel"
@@ -57,5 +65,7 @@ typedef struct AccelClass {
 extern int tcg_tb_size;
 
 void configure_accelerator(MachineState *ms);
+/* Register accelerator specific global properties */
+void accel_register_compat_props(AccelState *accel);
 
 #endif
diff --git a/vl.c b/vl.c
index 59fea15..4452d7a 100644
--- a/vl.c
+++ b/vl.c
@@ -4571,6 +4571,7 @@ 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"),
-- 
2.7.4