[Qemu-devel] [PATCH RESEND 7/9] virtio-rng: use aliases instead of duplicate qdev properties

[arei.gonglei]

From: Gonglei <arei.gong...@huawei.com>

virtio-rng-{pci, s390, ccw} all duplicate the
qdev properties of their VirtIORNG child.
This approach does not work well with string or pointer
properties since we must be careful about leaking or
double-freeing them.

Use the QOM alias property to forward property accesses to the
VirtIORNG child.  This way no duplication is necessary.

Signed-off-by: Gonglei <arei.gong...@huawei.com>
---
 hw/s390x/s390-virtio-bus.c | 2 +-
 hw/s390x/virtio-ccw.c      | 2 +-
 hw/virtio/virtio-pci.c     | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/hw/s390x/s390-virtio-bus.c b/hw/s390x/s390-virtio-bus.c
index 422402e..6d0a7f3 100644
--- a/hw/s390x/s390-virtio-bus.c
+++ b/hw/s390x/s390-virtio-bus.c
@@ -311,6 +311,7 @@ static void s390_virtio_rng_instance_init(Object *obj)
     VirtIORNGS390 *dev = VIRTIO_RNG_S390(obj);
     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_RNG);
     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
+    qdev_alias_all_properties(DEVICE(&dev->vdev), obj);
     object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
                              (Object **)&dev->vdev.conf.rng,
                              qdev_prop_allow_set_link_before_realize,
@@ -561,7 +562,6 @@ static const TypeInfo s390_virtio_serial = {
 
 static Property s390_virtio_rng_properties[] = {
     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOS390Device, host_features),
-    DEFINE_VIRTIO_RNG_PROPERTIES(VirtIORNGS390, vdev.conf),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 5d7f3a6..da2e427 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -1542,6 +1542,7 @@ static void virtio_ccw_rng_instance_init(Object *obj)
     VirtIORNGCcw *dev = VIRTIO_RNG_CCW(obj);
     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_RNG);
     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
+    qdev_alias_all_properties(DEVICE(&dev->vdev), obj);
     object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
                              (Object **)&dev->vdev.conf.rng,
                              qdev_prop_allow_set_link_before_realize,
@@ -1550,7 +1551,6 @@ static void virtio_ccw_rng_instance_init(Object *obj)
 
 static Property virtio_ccw_rng_properties[] = {
     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
-    DEFINE_VIRTIO_RNG_PROPERTIES(VirtIORNGCcw, vdev.conf),
     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
     DEFINE_PROP_END_OF_LIST(),
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 4446d79..2b3a941 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1483,7 +1483,6 @@ static const TypeInfo virtio_net_pci_info = {
 /* virtio-rng-pci */
 
 static Property virtio_rng_pci_properties[] = {
-    DEFINE_VIRTIO_RNG_PROPERTIES(VirtIORngPCI, vdev.conf),
     DEFINE_PROP_END_OF_LIST(),
 };
 
@@ -1525,6 +1524,7 @@ static void virtio_rng_initfn(Object *obj)
     VirtIORngPCI *dev = VIRTIO_RNG_PCI(obj);
     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_RNG);
     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
+    qdev_alias_all_properties(DEVICE(&dev->vdev), obj);
     object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
                              (Object **)&dev->vdev.conf.rng,
                              qdev_prop_allow_set_link_before_realize,
-- 
1.7.12.4