Re: [Qemu-devel] [PATCH v2 1/9] virtio-net: use aliases instead of duplicate qdev properties

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Sep 09, 2014 at 02:35:02PM +0800, arei.gonglei@huawei.com wrote:
> From: Gonglei <arei.gonglei@huawei.com>
> 
> virtio-net-pci, virtio-net-s390, and virtio-net-ccw all duplicate the
> qdev properties of their VirtIONet 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
> VirtIONet child.  This way no duplication is necessary.
> 
> Signed-off-by: Gonglei <arei.gonglei@huawei.com>
> ---
>  hw/s390x/s390-virtio-bus.c | 3 +--
>  hw/s390x/virtio-ccw.c      | 3 +--
>  hw/virtio/virtio-pci.c     | 3 +--
>  3 files changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/s390x/s390-virtio-bus.c b/hw/s390x/s390-virtio-bus.c
> index 6b6fb61..5b5d595 100644
> --- a/hw/s390x/s390-virtio-bus.c
> +++ b/hw/s390x/s390-virtio-bus.c
> @@ -161,6 +161,7 @@ static void s390_virtio_net_instance_init(Object *obj)
>      VirtIONetS390 *dev = VIRTIO_NET_S390(obj);
>      object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_NET);
>      object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
> +    qdev_alias_all_properties(DEVICE(&dev->vdev), obj);
>  }
>  
>  static int s390_virtio_blk_init(VirtIOS390Device *s390_dev)
> @@ -493,10 +494,8 @@ static unsigned virtio_s390_get_features(DeviceState *d)
>  /**************** S390 Virtio Bus Device Descriptions *******************/
>  
>  static Property s390_virtio_net_properties[] = {
> -    DEFINE_NIC_PROPERTIES(VirtIONetS390, vdev.nic_conf),
>      DEFINE_VIRTIO_COMMON_FEATURES(VirtIOS390Device, host_features),
>      DEFINE_VIRTIO_NET_FEATURES(VirtIOS390Device, host_features),
> -    DEFINE_VIRTIO_NET_PROPERTIES(VirtIONetS390, vdev.net_conf),
>      DEFINE_PROP_END_OF_LIST(),
>  };
>  
> diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
> index 33a1d86..7d67577 100644
> --- a/hw/s390x/virtio-ccw.c
> +++ b/hw/s390x/virtio-ccw.c
> @@ -794,6 +794,7 @@ static void virtio_ccw_net_instance_init(Object *obj)
>      VirtIONetCcw *dev = VIRTIO_NET_CCW(obj);
>      object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_NET);
>      object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
> +    qdev_alias_all_properties(DEVICE(&dev->vdev), obj);
>  }
>  
>  static int virtio_ccw_blk_init(VirtioCcwDevice *ccw_dev)
> @@ -1374,8 +1375,6 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
>  static Property virtio_ccw_net_properties[] = {
>      DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
>      DEFINE_VIRTIO_NET_FEATURES(VirtioCcwDevice, host_features[0]),
> -    DEFINE_VIRTIO_NET_PROPERTIES(VirtIONetCcw, vdev.net_conf),
> -    DEFINE_NIC_PROPERTIES(VirtIONetCcw, vdev.nic_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 ddb5da1..6722156 100644
> --- a/hw/virtio/virtio-pci.c
> +++ b/hw/virtio/virtio-pci.c
> @@ -1414,8 +1414,6 @@ static Property virtio_net_properties[] = {
>                      VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false),
>      DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3),
>      DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features),
> -    DEFINE_NIC_PROPERTIES(VirtIONetPCI, vdev.nic_conf),
> -    DEFINE_VIRTIO_NET_PROPERTIES(VirtIONetPCI, vdev.net_conf),
>      DEFINE_PROP_END_OF_LIST(),
>  };
>  
> @@ -1456,6 +1454,7 @@ static void virtio_net_pci_instance_init(Object *obj)
>      VirtIONetPCI *dev = VIRTIO_NET_PCI(obj);
>      object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_NET);
>      object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
> +    qdev_alias_all_properties(DEVICE(&dev->vdev), obj);
>  }
>  
>  static const TypeInfo virtio_net_pci_info = {

Does -device virtio-net-pci,? still list e.g. the mac property with this
patch?


> -- 
> 1.7.12.4
>