60 lines
2.1 KiB
Diff
60 lines
2.1 KiB
Diff
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From d42fea8a40c4a5d8909103910d86da8e674d1fb2 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
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Date: Mon, 14 Mar 2022 18:34:52 +0100
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Subject: [PATCH] vdpa: Adapt vhost_vdpa_get_vring_base to SVQ
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This is needed to achieve migration, so the destination can restore its
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index.
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Setting base as last used idx, so destination will see as available all
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the entries that the device did not use, including the in-flight
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processing ones.
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This is ok for networking, but other kinds of devices might have
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problems with these retransmissions.
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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Acked-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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Signed-off-by: fangyi <eric.fangyi@huawei.com>
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---
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hw/virtio/vhost-vdpa.c | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
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index 8245345bcd..428137f654 100644
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--- a/hw/virtio/vhost-vdpa.c
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+++ b/hw/virtio/vhost-vdpa.c
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@@ -1143,8 +1143,25 @@ static int vhost_vdpa_set_vring_base(struct vhost_dev *dev,
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static int vhost_vdpa_get_vring_base(struct vhost_dev *dev,
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struct vhost_vring_state *ring)
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{
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+ struct vhost_vdpa *v = dev->opaque;
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int ret;
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+ if (v->shadow_vqs_enabled) {
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+ VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs,
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+ ring->index);
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+
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+ /*
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+ * Setting base as last used idx, so destination will see as available
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+ * all the entries that the device did not use, including the in-flight
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+ * processing ones.
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+ *
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+ * TODO: This is ok for networking, but other kinds of devices might
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+ * have problems with these retransmissions.
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+ */
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+ ring->num = svq->last_used_idx;
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+ return 0;
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+ }
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+
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ret = vhost_vdpa_call(dev, VHOST_GET_VRING_BASE, ring);
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trace_vhost_vdpa_get_vring_base(dev, ring->index, ring->num);
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return ret;
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--
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2.27.0
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