[RFC PATCH v5 07/26] vdpa: Save kick_fd in vhost-vdpa

["Eugenio Pérez" <eperezma@redhat.com>]

We need to know it to switch to Shadow VirtQueue and back to normal
operation.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 include/hw/virtio/vhost-vdpa.h | 1 +
 hw/virtio/vhost-vdpa.c         | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h
index 3ce79a646d..c79a21c3c8 100644
--- a/include/hw/virtio/vhost-vdpa.h
+++ b/include/hw/virtio/vhost-vdpa.h
@@ -28,6 +28,7 @@ typedef struct vhost_vdpa {
     MemoryListener listener;
     struct vhost_vdpa_iova_range iova_range;
     struct vhost_dev *dev;
+    int kick_fd[VIRTIO_QUEUE_MAX];
     VhostVDPAHostNotifier notifier[VIRTIO_QUEUE_MAX];
 } VhostVDPA;
 
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 12661fd5b1..e6ee227385 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -702,7 +702,12 @@ static int vhost_vdpa_get_vring_base(struct vhost_dev *dev,
 static int vhost_vdpa_set_vring_kick(struct vhost_dev *dev,
                                        struct vhost_vring_file *file)
 {
+    struct vhost_vdpa *v = dev->opaque;
+    int vdpa_idx = vhost_vdpa_get_vq_index(dev, file->index);
+
     trace_vhost_vdpa_set_vring_kick(dev, file->index, file->fd);
+
+    v->kick_fd[vdpa_idx] = file->fd;
     return vhost_vdpa_call(dev, VHOST_SET_VRING_KICK, file);
 }
 
-- 
2.27.0