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[PATCH v4 11/14] vdpa: Adapt vhost_vdpa_get_vring_base to SVQ
From: |
Eugenio Pérez |
Subject: |
[PATCH v4 11/14] vdpa: Adapt vhost_vdpa_get_vring_base to SVQ |
Date: |
Thu, 3 Mar 2022 19:51:44 +0100 |
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 <eperezma@redhat.com>
---
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 8630d624f6..69a4bfd0d4 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -1143,8 +1143,25 @@ 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;
--
2.27.0
- [PATCH v4 03/14] vhost: Add Shadow VirtQueue call forwarding capabilities, (continued)
- [PATCH v4 03/14] vhost: Add Shadow VirtQueue call forwarding capabilities, Eugenio Pérez, 2022/03/03
- [PATCH v4 04/14] vhost: Add vhost_svq_valid_features to shadow vq, Eugenio Pérez, 2022/03/03
- [PATCH v4 05/14] virtio: Add vhost_svq_get_vring_addr, Eugenio Pérez, 2022/03/03
- [PATCH v4 06/14] vdpa: adapt vhost_ops callbacks to svq, Eugenio Pérez, 2022/03/03
- [PATCH v4 07/14] vhost: Shadow virtqueue buffers forwarding, Eugenio Pérez, 2022/03/03
- [PATCH v4 08/14] util: Add iova_tree_alloc_map, Eugenio Pérez, 2022/03/03
- [PATCH v4 09/14] vhost: Add VhostIOVATree, Eugenio Pérez, 2022/03/03
- [PATCH v4 10/14] vdpa: Add custom IOTLB translations to SVQ, Eugenio Pérez, 2022/03/03
- [PATCH v4 11/14] vdpa: Adapt vhost_vdpa_get_vring_base to SVQ,
Eugenio Pérez <=
- [PATCH v4 12/14] vdpa: Never set log_base addr if SVQ is enabled, Eugenio Pérez, 2022/03/03
- [PATCH v4 13/14] vdpa: Expose VHOST_F_LOG_ALL on SVQ, Eugenio Pérez, 2022/03/03
- [PATCH v4 14/14] vdpa: Add x-svq to NetdevVhostVDPAOptions, Eugenio Pérez, 2022/03/03