It's a minor typo issue, /dev/vhost-net is a default device.
# ll /dev/vhost-net
crw-------. 1 root root 10, 238 Sep 22 20:30 /dev/vhost-net
---
docs/formatdomain.html.in | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 5e2b65a..eefdd5e 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -3989,7 +3989,7 @@ qemu-kvm -net nic,model=? /dev/null
<source network='default'/>
<target dev='vnet1'/>
<model type='virtio'/>
- <b><backend tap='/dev/net/tun'
vhost='/dev/net-vhost'/></b>
+ <b><backend tap='/dev/net/tun'
vhost='/dev/vhost-net'/></b>
<driver name='vhost' txmode='iothread'
ioeventfd='on' event_idx='off' queues='5'/>
</interface>
</devices>
--
1.8.3.1