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From 9e737aba614e94da4458f02d4ff97e95ffffd19f Mon Sep 17 00:00:00 2001
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From: Si-Wei Liu <si-wei.liu@oracle.com>
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Date: Fri, 6 May 2022 19:28:12 -0700
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Subject: [PATCH 08/16] virtio-net: setup vhost_dev and notifiers for cvq only
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when feature is negotiated
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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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RH-Author: Jason Wang <jasowang@redhat.com>
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RH-MergeRequest: 98: Multiqueue fixes for vhost-vDPA
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RH-Commit: [1/7] a5c5a2862b2e4d15ef7c09da3e4234fdef37cc66 (jasowang/qemu-kvm-cs)
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RH-Bugzilla: 2070804
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RH-Acked-by: Eugenio Pérez <eperezma@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Cindy Lu <lulu@redhat.com>
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When the control virtqueue feature is absent or not negotiated,
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vhost_net_start() still tries to set up vhost_dev and install
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vhost notifiers for the control virtqueue, which results in
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erroneous ioctl calls with incorrect queue index sending down
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to driver. Do that only when needed.
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Fixes: 22288fe ("virtio-net: vhost control virtqueue support")
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Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
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Acked-by: Jason Wang <jasowang@redhat.com>
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Message-Id: <1651890498-24478-2-git-send-email-si-wei.liu@oracle.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit aa8581945a13712ff3eed0ad3ba7a9664fc1604b)
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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---
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hw/net/virtio-net.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
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index 1067e72b39..ffb3475201 100644
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--- a/hw/net/virtio-net.c
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+++ b/hw/net/virtio-net.c
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@@ -245,7 +245,8 @@ static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
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VirtIODevice *vdev = VIRTIO_DEVICE(n);
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NetClientState *nc = qemu_get_queue(n->nic);
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int queue_pairs = n->multiqueue ? n->max_queue_pairs : 1;
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- int cvq = n->max_ncs - n->max_queue_pairs;
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+ int cvq = virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) ?
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+ n->max_ncs - n->max_queue_pairs : 0;
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if (!get_vhost_net(nc->peer)) {
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return;
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--
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2.31.1
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