[Qemu-devel] [PATCH 5/5] mc146818rtc: add "rtc" link to "/machine"

[Paolo Bonzini <pbonzini@redhat.com>]

From: Marcelo Tosatti <mtosatti@redhat.com>

Add a link to rtc under /machine providing a stable
location for management apps to query "date" field.

{"execute":"qom-get","arguments":{"path":"/machine/rtc","property":"date"} }

Suggested by Paolo Bonzini.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: mtosatti@redhat.com <mtosatti@redhat.com>
---
 hw/timer/mc146818rtc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/hw/timer/mc146818rtc.c b/hw/timer/mc146818rtc.c
index df54546..8c706e1 100644
--- a/hw/timer/mc146818rtc.c
+++ b/hw/timer/mc146818rtc.c
@@ -893,6 +893,9 @@ static void rtc_realizefn(DeviceState *dev, Error **errp)
 
     object_property_add(OBJECT(s), "date", "struct tm",
                         rtc_get_date, NULL, NULL, s, NULL);
+
+    object_property_add_alias(qdev_get_machine(), "rtc",
+                              OBJECT(s), NULL, &error_abort);
 }
 
 ISADevice *rtc_init(ISABus *bus, int base_year, qemu_irq intercept_irq)
@@ -932,11 +935,17 @@ static void rtc_class_initfn(ObjectClass *klass, void *data)
     dc->cannot_instantiate_with_device_add_yet = true;
 }
 
+static void rtc_finalize(Object *obj)
+{
+    object_property_del(qdev_get_machine(), "rtc", NULL);
+}
+
 static const TypeInfo mc146818rtc_info = {
     .name          = TYPE_MC146818_RTC,
     .parent        = TYPE_ISA_DEVICE,
     .instance_size = sizeof(RTCState),
     .class_init    = rtc_class_initfn,
+    .instance_finalize = rtc_finalize,
 };
 
 static void mc146818rtc_register_types(void)
-- 
1.8.3.1