[RFC 1/2] virtio-net: disable the configure interrupt for not support device

[Cindy Lu <lulu@redhat.com>]

Only the vdpa device support configure interrupt, we need to disable the
configure interrupt process in all other device.
In order to achieve this, I added a check in the virtio_net_device_realize().
When the peer's type is vdpa, the value of config_irq_enabled in the structure
VirtIODevice will set to true.

Signed-off-by: Cindy Lu <lulu@redhat.com>
---
 hw/net/virtio-net.c        | 5 ++++-
 hw/virtio/virtio.c         | 1 +
 include/hw/virtio/virtio.h | 1 +
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 80c56f0cfc..3b487864a8 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3749,12 +3749,15 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
 
     nc = qemu_get_queue(n->nic);
     nc->rxfilter_notify_enabled = 1;
+    vdev->config_irq_enabled = false;
 
-   if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
+    if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
         struct virtio_net_config netcfg = {};
         memcpy(&netcfg.mac, &n->nic_conf.macaddr, ETH_ALEN);
         vhost_net_set_config(get_vhost_net(nc->peer),
             (uint8_t *)&netcfg, 0, ETH_ALEN, VHOST_SET_CONFIG_TYPE_FRONTEND);
+
+        vdev->config_irq_enabled = true;
     }
     QTAILQ_INIT(&n->rsc_chains);
     n->qdev = dev;
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 3a160f86ed..6b52a7190d 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -3255,6 +3255,7 @@ void virtio_init(VirtIODevice *vdev, uint16_t device_id, size_t config_size)
             virtio_vmstate_change, vdev);
     vdev->device_endian = virtio_default_endian();
     vdev->use_guest_notifier_mask = true;
+    vdev->config_irq_enabled = false;
 }
 
 /*
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index c8f72850bc..a7763b71e0 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -164,6 +164,7 @@ struct VirtIODevice
      */
     EventNotifier config_notifier;
     bool device_iotlb_enabled;
+    bool config_irq_enabled;
 };
 
 struct VirtioDeviceClass {
-- 
2.43.0