From 6d0b222666339d09910d495c65e6abb7d404fc2b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= Date: Mon, 14 Mar 2022 18:34:52 +0100 Subject: vdpa: Adapt vhost_vdpa_get_vring_base to SVQ MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This is needed to achieve migration, so the destination can restore its 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. This is ok for networking, but other kinds of devices might have problems with these retransmissions. Signed-off-by: Eugenio Pérez Acked-by: Michael S. Tsirkin Signed-off-by: Jason Wang --- hw/virtio/vhost-vdpa.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'hw/virtio') diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index ec38189492..93dbe1043c 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -1141,8 +1141,25 @@ 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; -- cgit v1.2.3