vhost-net requires to open one file descriptor for each TX/RX queue
pair. At the moment kvmtool does not support multi-queue vhost: it
issues all vhost ioctls on the first pair, and the other pairs are
broken. Refuse the enable vhost when the user asks for multi-queue.
Using multi-queue vhost-net also requires creating the tap interface
with the 'multi_queue' parameter.
Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
---
virtio/net.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/virtio/net.c b/virtio/net.c
index c4d20f22..02667176 100644
--- a/virtio/net.c
+++ b/virtio/net.c
@@ -741,6 +741,11 @@ static struct virtio_ops net_dev_virtio_ops = {
static void virtio_net__vhost_init(struct kvm *kvm, struct net_dev *ndev)
{
+ if (ndev->queue_pairs > 1) {
+ pr_warning("multiqueue is not supported with vhost yet");
+ return;
+ }
+
ndev->vhost_fd = open("/dev/vhost-net", O_RDWR);
if (ndev->vhost_fd < 0)
die_perror("Failed openning vhost-net device");
--
2.40.1
