Revert "virtio-mmio: add support for configure interrupt"

This reverts commit d48185f.

hw/virtio/virtio-mmio.c

@@ -673,30 +673,7 @@ static int virtio_mmio_set_guest_notifier(DeviceState *d, int n, bool assign,
 
     return 0;
 }
-static int virtio_mmio_set_config_guest_notifier(DeviceState *d, bool assign)
-{
-    VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
-    VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
-    VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
-    bool with_irqfd = false;
-    EventNotifier *notifier = virtio_config_get_guest_notifier(vdev);
-    int r = 0;
 
-    if (assign) {
-        r = event_notifier_init(notifier, 0);
-        if (r < 0) {
-            return r;
-        }
-        virtio_config_set_guest_notifier_fd_handler(vdev, assign, with_irqfd);
-    } else {
-        virtio_config_set_guest_notifier_fd_handler(vdev, assign, with_irqfd);
-        event_notifier_cleanup(notifier);
-    }
-    if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) {
-        vdc->guest_notifier_mask(vdev, VIRTIO_CONFIG_IRQ_IDX, !assign);
-    }
-    return r;
-}
 static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs,
                                            bool assign)
 {
@@ -718,10 +695,6 @@ static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs,
             goto assign_error;
         }
     }
-    r = virtio_mmio_set_config_guest_notifier(d, assign);
-    if (r < 0) {
-        goto assign_error;
-    }
 
     return 0;