在 2022/2/27 下午9:41, Eugenio Pérez 写道:
This is needed to achieve migration, so the destination can restore its index.
I suggest to duplicate the comment below here. Thanks
Signed-off-by: Eugenio Pérez <eperezma@xxxxxxxxxx> --- hw/virtio/vhost-vdpa.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index 56f9f125cd..accc4024c2 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -1180,8 +1180,25 @@ 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); + + /* + * Setting base as last used idx, so destination will see as available + * all the entries that the device did not use, including the in-flight + * processing ones. + * + * TODO: This is ok for networking, but other kinds of devices might + * have problems with these retransmissions. + */ + ring->num = svq->last_used_idx; + 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;
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