vdpa: Remember last call fd set

As SVQ can be enabled dynamically at any time, it needs to store call fd
always.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20230303172445.1089785-3-eperezma@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index df3a1e9..108cd63 100644 (file)
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -1227,16 +1227,16 @@ static int vhost_vdpa_set_vring_call(struct vhost_dev *dev,
                                        struct vhost_vring_file *file)
 {
     struct vhost_vdpa *v = dev->opaque;
+    int vdpa_idx = file->index - dev->vq_index;
+    VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs, vdpa_idx);
 
+    /* Remember last call fd because we can switch to SVQ anytime. */
+    vhost_svq_set_svq_call_fd(svq, file->fd);
     if (v->shadow_vqs_enabled) {
-        int vdpa_idx = file->index - dev->vq_index;
-        VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs, vdpa_idx);
-
-        vhost_svq_set_svq_call_fd(svq, file->fd);
         return 0;
-    } else {
-        return vhost_vdpa_set_vring_dev_call(dev, file);
     }
+
+    return vhost_vdpa_set_vring_dev_call(dev, file);
 }
 
 static int vhost_vdpa_get_features(struct vhost_dev *dev,