Add support for configure interrupt in virtio_net
The functions are config_pending and config_mask

Signed-off-by: Cindy Lu <lulu@redhat.com>
---
 hw/net/vhost_net.c      | 10 ++++++++++
 hw/net/virtio-net.c     |  6 ++++++
 include/net/vhost_net.h |  3 +++
 3 files changed, 19 insertions(+)

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 10a7780a13..1e78ef8349 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -433,6 +433,16 @@ void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
     vhost_virtqueue_mask(&net->dev, dev, idx, mask);
 }
 
+bool vhost_net_config_pending(VHostNetState *net)
+{
+    return vhost_config_pending(&net->dev);
+}
+
+void vhost_net_config_mask(VHostNetState *net, VirtIODevice *dev,
+                              bool mask)
+{
+    vhost_config_mask(&net->dev, dev, mask);
+}
 VHostNetState *get_vhost_net(NetClientState *nc)
 {
     VHostNetState *vhost_net = 0;
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 65b7cabcaf..005818a45a 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3155,6 +3155,9 @@ static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
     if (idx != VIRTIO_CONFIG_IRQ_IDX) {
         return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
     }
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        return vhost_net_config_pending(get_vhost_net(nc->peer));
+   }
     return false;
 }
 
@@ -3167,6 +3170,9 @@ static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
     if (idx != VIRTIO_CONFIG_IRQ_IDX) {
         vhost_net_virtqueue_mask(get_vhost_net(nc->peer), vdev, idx, mask);
     }
+    if (idx == VIRTIO_CONFIG_IRQ_IDX) {
+        vhost_net_config_mask(get_vhost_net(nc->peer), vdev, mask);
+     }
 }
 
 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features)
diff --git a/include/net/vhost_net.h b/include/net/vhost_net.h
index 172b0051d8..478c127582 100644
--- a/include/net/vhost_net.h
+++ b/include/net/vhost_net.h
@@ -36,6 +36,9 @@ int vhost_net_set_config(struct vhost_net *net, const uint8_t *data,
 bool vhost_net_virtqueue_pending(VHostNetState *net, int n);
 void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
                               int idx, bool mask);
+bool vhost_net_config_pending(VHostNetState *net);
+void vhost_net_config_mask(VHostNetState *net, VirtIODevice *dev,
+                              bool mask);
 int vhost_net_notify_migration_done(VHostNetState *net, char* mac_addr);
 VHostNetState *get_vhost_net(NetClientState *nc);
 
-- 
2.21.3