The first call of sysbus_get_default() creates the main system bus and
stores it in QOM as "/machine/unattached/sysbus". This must not
happen before main() creates "/machine", or else container_get() would
"helpfully" create it as "container" object, and the real creation of
"/machine" would later abort with "attempt to add duplicate property
'machine' to object (type 'container')". Has been that way ever since
we wired up busses in QOM (commit f968fc6892d, v1.2.0).
I believe the bug is latent. I got it to bite by trying to
qdev_create() a sysbus device from a machine's .instance_init()
method.
The fix is obvious: store the main system bus in QOM right after
creating "/machine".
Signed-off-by: Markus Armbruster <arm...@redhat.com>
---
hw/core/sysbus.c | 3 ---
vl.c | 4 ++++
2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/hw/core/sysbus.c b/hw/core/sysbus.c
index 9f9edbcab9..307cf90a51 100644
--- a/hw/core/sysbus.c
+++ b/hw/core/sysbus.c
@@ -357,9 +357,6 @@ static void main_system_bus_create(void)
qbus_create_inplace(main_system_bus, system_bus_info.instance_size,
TYPE_SYSTEM_BUS, NULL, "main-system-bus");
OBJECT(main_system_bus)->free = g_free;
- object_property_add_child(container_get(qdev_get_machine(),
- "/unattached"),
- "sysbus", OBJECT(main_system_bus), NULL);
}
BusState *sysbus_get_default(void)
diff --git a/vl.c b/vl.c
index e3fdce410f..6ce3d2d448 100644
--- a/vl.c
+++ b/vl.c
@@ -3990,6 +3990,10 @@ int main(int argc, char **argv, char **envp)
}
object_property_add_child(object_get_root(), "machine",
OBJECT(current_machine), &error_abort);
+ object_property_add_child(container_get(OBJECT(current_machine),
+ "/unattached"),
+ "sysbus", OBJECT(sysbus_get_default()),
+ NULL);
if (machine_class->minimum_page_bits) {
if (!set_preferred_target_page_bits(machine_class->minimum_page_bits))
{
--
2.17.2
