[RFC PATCH v8 13/21] vhost: Add ShadowVirtQueueStart operation

[Eugenio Pérez]

It allows to run commands at SVQ start.

Signed-off-by: Eugenio Pérez <epere...@redhat.com>
---
 hw/virtio/vhost-shadow-virtqueue.h |  4 ++++
 hw/virtio/vhost-vdpa.c             | 14 ++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/hw/virtio/vhost-shadow-virtqueue.h 
b/hw/virtio/vhost-shadow-virtqueue.h
index 8fe0367944..3c55fe2641 100644
--- a/hw/virtio/vhost-shadow-virtqueue.h
+++ b/hw/virtio/vhost-shadow-virtqueue.h
@@ -28,10 +28,14 @@ typedef struct SVQElement {
     bool not_from_guest;
 } SVQElement;
 
+typedef struct VhostShadowVirtqueue VhostShadowVirtqueue;
+typedef int (*ShadowVirtQueueStart)(VhostShadowVirtqueue *svq,
+                                    struct vhost_dev *dev);
 typedef void (*VirtQueueElementCallback)(VirtIODevice *vdev,
                                          const VirtQueueElement *elem);
 
 typedef struct VhostShadowVirtqueueOps {
+    ShadowVirtQueueStart start;
     VirtQueueElementCallback used_elem_handler;
 } VhostShadowVirtqueueOps;
 
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 13e5e2a061..eec6d544e9 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -1141,6 +1141,20 @@ static int vhost_vdpa_dev_start(struct vhost_dev *dev, 
bool started)
         if (unlikely(r)) {
             return r;
         }
+
+        if (v->shadow_vqs_enabled) {
+            for (unsigned i = 0; i < v->shadow_vqs->len; ++i) {
+                VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs,
+                                                              i);
+                if (svq->ops && svq->ops->start) {
+                    r = svq->ops->start(svq, dev);
+                    if (unlikely(r)) {
+                        return r;
+                    }
+                }
+            }
+        }
+
         vhost_vdpa_set_vring_ready(dev);
     } else {
         vhost_vdpa_reset_device(dev);
-- 
2.27.0