It will be used to configure shadow virtqueue. Shadow virtqueue will
relay the device->guest notifications, so vhost need to be able to tell
the masking status.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 include/hw/virtio/vhost.h | 1 +
 hw/virtio/vhost.c         | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index 4a8bc75415..ac963bf23d 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -28,6 +28,7 @@ struct vhost_virtqueue {
     unsigned avail_size;
     unsigned long long used_phys;
     unsigned used_size;
+    bool notifier_is_masked;
     EventNotifier masked_notifier;
     struct vhost_dev *dev;
 };
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index e2163a0d63..4680c0cfcf 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1527,6 +1527,8 @@ void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
     r = hdev->vhost_ops->vhost_set_vring_call(hdev, &file);
     if (r < 0) {
         VHOST_OPS_DEBUG("vhost_set_vring_call failed");
+    } else {
+        hdev->vqs[index].notifier_is_masked = mask;
     }
 }
 
-- 
2.27.0