[25/31] vdpa: Adapt vhost_vdpa_get_vring_base to SVQ

Commit Message

Eugenio Perez Martin Jan. 21, 2022, 8:27 p.m. UTC

This is needed to achieve migration, so destination can restore its
index.

Signed-off-by: Eugenio Pérez <[e-mail]>
---
 hw/virtio/vhost-vdpa.c | 9 +++++++++
 1 file changed, 9 insertions(+)

Patch

diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 276a559649..887857c177 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -716,8 +716,17 @@  static int vhost_vdpa_set_vring_base(struct vhost_dev *dev,
 static int vhost_vdpa_get_vring_base(struct vhost_dev *dev,
                                        struct vhost_vring_state *ring)
 {
+    struct vhost_vdpa *v = dev->opaque;
     int ret;
 
+    if (v->shadow_vqs_enabled) {
+        VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs,
+                                                      ring->index);
+
+        ring->num = vhost_svq_get_last_used_idx(svq);
+        return 0;
+    }
+
     ret = vhost_vdpa_call(dev, VHOST_GET_VRING_BASE, ring);
     trace_vhost_vdpa_get_vring_base(dev, ring->index, ring->num);
     return ret;