diff --git a/src/python/pybind_init.hh b/src/python/pybind_init.hh
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+++ b/src/python/pybind_init.hh
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+/*
+ * Copyright 2021 Google, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __PYTHON_PYBIND_INIT_HH__
+#define __PYTHON_PYBIND_INIT_HH__
+
+#include <Python.h>
+
+#include "pybind11/pybind11.h"
+
+namespace gem5
+{
+
+struct PybindModuleInit
+{
+    PybindModuleInit(const char *name, PyObject *(*func)())
+    {
+        if (Py_IsInitialized()) {
+            // If python is running, initialize and inject the module.
+            PyImport_AddModule(name);
+            PyObject *sys_modules = PyImport_GetModuleDict();
+            PyDict_SetItemString(sys_modules, name, func());
+        } else {
+            // If not, tell python how to build importer itself later.
+            PyImport_AppendInittab(name, func);
+        }
+    }
+};
+
+} // namespace gem5
+
+#define GEM5_PYBIND_MODULE_INIT(name, func) \
+namespace { \
+ \
+::PyObject * \
+initializer() \
+{ \
+    static ::pybind11::module_::module_def mod_def; \
+    static auto m = ::pybind11::module_::create_extension_module( \
+            #name, nullptr, &mod_def); \
+    func(m); \
+    m.inc_ref(); \
+    return m.ptr(); \
+} \
+ \
+::gem5::PybindModuleInit modInit(#name, initializer); \
+ \
+} // anonymous namespace
+
+#endif // __PYTHON_PYBIND_INIT_HH__