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diff --git a/include/VBox/vd-plugin.h b/include/VBox/vd-plugin.h
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+/** @file
+ * VD: Plugin support API.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef VBOX_INCLUDED_vd_plugin_h
+#define VBOX_INCLUDED_vd_plugin_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <VBox/vd.h>
+#include <VBox/vd-common.h>
+#include <VBox/vd-image-backend.h>
+#include <VBox/vd-cache-backend.h>
+#include <VBox/vd-filter-backend.h>
+
+/**
+ * Backend register callbacks structure.
+ */
+typedef struct VDBACKENDREGISTER
+{
+    /** Interface version.
+     * This is set to VD_BACKENDREG_CB_VERSION. */
+    uint32_t                    u32Version;
+
+    /**
+     * Registers a new image backend.
+     *
+     * @returns VBox status code.
+     * @param   pvUser    Opaque user data given in the plugin load callback.
+     * @param   pBackend  The image backend to register.
+     */
+    DECLR3CALLBACKMEMBER(int, pfnRegisterImage, (void *pvUser, PCVDIMAGEBACKEND pBackend));
+
+    /**
+     * Registers a new cache backend.
+     *
+     * @returns VBox status code.
+     * @param   pvUser    Opaque user data given in the plugin load callback.
+     * @param   pBackend  The cache backend to register.
+     */
+    DECLR3CALLBACKMEMBER(int, pfnRegisterCache, (void *pvUser, PCVDCACHEBACKEND pBackend));
+
+    /**
+     * Registers a new filter plugin.
+     * @param   pvUser    Opaque user data given in the plugin load callback.
+     * @param   pBackend  The filter backend to register.
+     */
+    DECLR3CALLBACKMEMBER(int, pfnRegisterFilter, (void *pvUser, PCVDFILTERBACKEND pBackend));
+
+} VDBACKENDREGISTER;
+/** Pointer to a backend register callbacks structure. */
+typedef VDBACKENDREGISTER *PVDBACKENDREGISTER;
+
+/** Current version of the VDBACKENDREGISTER structure.  */
+#define VD_BACKENDREG_CB_VERSION                VD_VERSION_MAKE(0xff00, 1, 0)
+
+/**
+ * Initialization entry point called by the generic VD layer when
+ * a plugin is loaded.
+ *
+ * @returns VBox status code.
+ * @param   pvUser             Opaque user data passed in the register callbacks.
+ * @param   pRegisterCallbacks Pointer to the register callbacks structure.
+ */
+typedef DECLCALLBACK(int) FNVDPLUGINLOAD(void *pvUser, PVDBACKENDREGISTER pRegisterCallbacks);
+typedef FNVDPLUGINLOAD *PFNVDPLUGINLOAD;
+#define VD_PLUGIN_LOAD_NAME "VDPluginLoad"
+
+/** The prefix to identify Storage Plugins. */
+#define VD_PLUGIN_PREFIX "VDPlugin"
+/** The size of the prefix excluding the '\\0' terminator. */
+#define VD_PLUGIN_PREFIX_LENGTH (sizeof(VD_PLUGIN_PREFIX)-1)
+
+#endif /* !VBOX_INCLUDED_vd_plugin_h */