We intend to create the virtio-iommu from the virt machine
realize() code and not by passing the -device virtio-iommu-device
option. That way the instantiation of the virtio-iommu can
depend on a virt machine option, as it is currently done for
the smmuv3 iommu.

Its parent bus, the virtio-bus will need to be located and
set. We intend to locate it by using qbus_find_recursive().

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 include/hw/qdev-core.h | 3 +++
 qdev-monitor.c         | 5 ++---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index f1fd0f8..f359c52 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -377,6 +377,9 @@ void qbus_reset_all_fn(void *opaque);
 /* This should go away once we get rid of the NULL bus hack */
 BusState *sysbus_get_default(void);
 
+BusState *qbus_find_recursive(BusState *bus, const char *name,
+                              const char *bus_typename);
+
 char *qdev_get_fw_dev_path(DeviceState *dev);
 char *qdev_get_own_fw_dev_path_from_handler(BusState *bus, DeviceState *dev);
 
diff --git a/qdev-monitor.c b/qdev-monitor.c
index 61e0300..666e439 100644
--- a/qdev-monitor.c
+++ b/qdev-monitor.c
@@ -410,8 +410,8 @@ static inline bool qbus_is_full(BusState *bus)
  * If more than one exists, prefer one that can take another device.
  * Return the bus if found, else %NULL.
  */
-static BusState *qbus_find_recursive(BusState *bus, const char *name,
-                                     const char *bus_typename)
+BusState *qbus_find_recursive(BusState *bus, const char *name,
+                              const char *bus_typename)
 {
     BusChild *kid;
     BusState *pick, *child, *ret;
@@ -567,7 +567,6 @@ DeviceState *qdev_device_add(QemuOpts *opts, Error **errp)
         error_setg(errp, QERR_MISSING_PARAMETER, "driver");
         return NULL;
     }
-
     /* find driver */
     dc = qdev_get_device_class(&driver, errp);
     if (!dc) {
-- 
2.5.5