Enable tap mode network and vhost

tools/net/qemu-ifup.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# SPDX-License-Identifier: MPL-2.0
+
+# Create a TAP interface.
+#
+# It's used for the startup script of QEMU netdev, DO NOT run it manually.
+
+# This IP address should be set the same as gateway address of Asterinas
+IP=10.0.2.2/24
+
+if [ -n "$1" ]; then
+    ip addr add $IP dev "$1"
+    ip link set dev "$1" up
+    exit
+else
+    echo "Error: no interface specified"
+    exit 1
+fi