Add tcp latency test over virtio-net

test/benchmark/lmbench/tcp_virtio_lat/host.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+# SPDX-License-Identifier: MPL-2.0
+
+set -e
+
+# Function to stop the guest VM
+stop_guest() {
+    echo "Stopping guest VM..."
+    # `-r` means if there's no qemu, the kill won't be executed
+    pgrep qemu | xargs -r kill
+}
+
+# Trap EXIT signal to ensure guest VM is stopped on script exit
+trap stop_guest EXIT
+
+# Run lmbench tcp client
+echo "Running lmbench tcp client"
+/usr/local/benchmark/lmbench/lat_tcp -P 1 127.0.0.1
+
+# The trap will automatically stop the guest VM when the script exits