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+/** @file
+ * VirtualBox - Extension Pack Interface.
+ */
+
+/*
+ * Copyright (C) 2010-2019 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_ExtPack_ExtPack_h
+#define VBOX_INCLUDED_ExtPack_ExtPack_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <VBox/types.h>
+
+/** @def VBOXEXTPACK_IF_CS
+ * Selects 'class' on 'struct' for interface references.
+ * @param I The interface name
+ */
+#if defined(__cplusplus) && !defined(RT_OS_WINDOWS)
+# define VBOXEXTPACK_IF_CS(I) class I
+#else
+# define VBOXEXTPACK_IF_CS(I) struct I
+#endif
+
+VBOXEXTPACK_IF_CS(IUnknown);
+VBOXEXTPACK_IF_CS(IConsole);
+VBOXEXTPACK_IF_CS(IMachine);
+VBOXEXTPACK_IF_CS(IVirtualBox);
+VBOXEXTPACK_IF_CS(IProgress);
+
+/**
+ * Module kind for use with VBOXEXTPACKHLP::pfnFindModule.
+ */
+typedef enum VBOXEXTPACKMODKIND
+{
+ /** Zero is invalid as always. */
+ VBOXEXTPACKMODKIND_INVALID = 0,
+ /** Raw-mode context module. */
+ VBOXEXTPACKMODKIND_RC,
+ /** Ring-0 context module. */
+ VBOXEXTPACKMODKIND_R0,
+ /** Ring-3 context module. */
+ VBOXEXTPACKMODKIND_R3,
+ /** End of the valid values (exclusive). */
+ VBOXEXTPACKMODKIND_END,
+ /** The usual 32-bit type hack. */
+ VBOXEXTPACKMODKIND_32BIT_HACK = 0x7fffffff
+} VBOXEXTPACKMODKIND;
+
+/**
+ * Contexts returned by VBOXEXTPACKHLP::pfnGetContext.
+ */
+typedef enum VBOXEXTPACKCTX
+{
+ /** Zero is invalid as always. */
+ VBOXEXTPACKCTX_INVALID = 0,
+ /** The per-user daemon process (VBoxSVC). */
+ VBOXEXTPACKCTX_PER_USER_DAEMON,
+ /** A VM process. */
+ VBOXEXTPACKCTX_VM_PROCESS,
+ /** An API client process.
+ * @remarks This will not be returned by VirtualBox yet. */
+ VBOXEXTPACKCTX_CLIENT_PROCESS,
+ /** End of the valid values (exclusive). */
+ VBOXEXTPACKCTX_END,
+ /** The usual 32-bit type hack. */
+ VBOXEXTPACKCTX_32BIT_HACK = 0x7fffffff
+} VBOXEXTPACKCTX;
+
+
+/** Pointer to const helpers passed to the VBoxExtPackRegister() call. */
+typedef const struct VBOXEXTPACKHLP *PCVBOXEXTPACKHLP;
+/**
+ * Extension pack helpers passed to VBoxExtPackRegister().
+ *
+ * This will be valid until the module is unloaded.
+ */
+typedef struct VBOXEXTPACKHLP
+{
+ /** Interface version.
+ * This is set to VBOXEXTPACKHLP_VERSION. */
+ uint32_t u32Version;
+
+ /** The VirtualBox full version (see VBOX_FULL_VERSION). */
+ uint32_t uVBoxFullVersion;
+ /** The VirtualBox subversion tree revision. */
+ uint32_t uVBoxInternalRevision;
+ /** Explicit alignment padding, must be zero. */
+ uint32_t u32Padding;
+ /** Pointer to the version string (read-only). */
+ const char *pszVBoxVersion;
+
+ /**
+ * Finds a module belonging to this extension pack.
+ *
+ * @returns VBox status code.
+ * @param pHlp Pointer to this helper structure.
+ * @param pszName The module base name.
+ * @param pszExt The extension. If NULL the default ring-3
+ * library extension will be used.
+ * @param enmKind The kind of module to locate.
+ * @param pszFound Where to return the path to the module on
+ * success.
+ * @param cbFound The size of the buffer @a pszFound points to.
+ * @param pfNative Where to return the native/agnostic indicator.
+ */
+ DECLR3CALLBACKMEMBER(int, pfnFindModule,(PCVBOXEXTPACKHLP pHlp, const char *pszName, const char *pszExt,
+ VBOXEXTPACKMODKIND enmKind,
+ char *pszFound, size_t cbFound, bool *pfNative));
+
+ /**
+ * Gets the path to a file belonging to this extension pack.
+ *
+ * @returns VBox status code.
+ * @retval VERR_INVALID_POINTER if any of the pointers are invalid.
+ * @retval VERR_BUFFER_OVERFLOW if the buffer is too small. The buffer
+ * will contain nothing.
+ *
+ * @param pHlp Pointer to this helper structure.
+ * @param pszFilename The filename.
+ * @param pszPath Where to return the path to the file on
+ * success.
+ * @param cbPath The size of the buffer @a pszPath.
+ */
+ DECLR3CALLBACKMEMBER(int, pfnGetFilePath,(PCVBOXEXTPACKHLP pHlp, const char *pszFilename, char *pszPath, size_t cbPath));
+
+ /**
+ * Gets the context the extension pack is operating in.
+ *
+ * @returns The context.
+ * @retval VBOXEXTPACKCTX_INVALID if @a pHlp is invalid.
+ *
+ * @param pHlp Pointer to this helper structure.
+ */
+ DECLR3CALLBACKMEMBER(VBOXEXTPACKCTX, pfnGetContext,(PCVBOXEXTPACKHLP pHlp));
+
+ /**
+ * Loads a HGCM service provided by an extension pack.
+ *
+ * @returns VBox status code.
+ * @param pHlp Pointer to this helper structure.
+ * @param pConsole Pointer to the VM's console object.
+ * @param pszServiceLibrary Name of the library file containing the
+ * service implementation, without extension.
+ * @param pszServiceName Name of HGCM service.
+ */
+ DECLR3CALLBACKMEMBER(int, pfnLoadHGCMService,(PCVBOXEXTPACKHLP pHlp, VBOXEXTPACK_IF_CS(IConsole) *pConsole,
+ const char *pszServiceLibrary, const char *pszServiceName));
+
+ /**
+ * Loads a VD plugin provided by an extension pack.
+ *
+ * This makes sense only in the context of the per-user service (VBoxSVC).
+ *
+ * @returns VBox status code.
+ * @param pHlp Pointer to this helper structure.
+ * @param pVirtualBox Pointer to the VirtualBox object.
+ * @param pszPluginLibrary Name of the library file containing the plugin
+ * implementation, without extension.
+ */
+ DECLR3CALLBACKMEMBER(int, pfnLoadVDPlugin,(PCVBOXEXTPACKHLP pHlp, VBOXEXTPACK_IF_CS(IVirtualBox) *pVirtualBox,
+ const char *pszPluginLibrary));
+
+ /**
+ * Unloads a VD plugin provided by an extension pack.
+ *
+ * This makes sense only in the context of the per-user service (VBoxSVC).
+ *
+ * @returns VBox status code.
+ * @param pHlp Pointer to this helper structure.
+ * @param pVirtualBox Pointer to the VirtualBox object.
+ * @param pszPluginLibrary Name of the library file containing the plugin
+ * implementation, without extension.
+ */
+ DECLR3CALLBACKMEMBER(int, pfnUnloadVDPlugin,(PCVBOXEXTPACKHLP pHlp, VBOXEXTPACK_IF_CS(IVirtualBox) *pVirtualBox,
+ const char *pszPluginLibrary));
+
+ /**
+ * Creates an IProgress object instance for a long running extension
+ * pack provided API operation which is executed asynchronously.
+ *
+ * This implicitly creates a cancellable progress object, since anything
+ * else is user unfriendly. You need to design your code to handle
+ * cancellation with reasonable response time.
+ *
+ * @returns COM status code.
+ * @param pHlp Pointer to this helper structure.
+ * @param pInitiator Pointer to the initiating object.
+ * @param pcszDescription Description of the overall task.
+ * @param cOperations Number of operations for this task.
+ * @param uTotalOperationsWeight Overall weight for the entire task.
+ * @param pcszFirstOperationDescription Description of the first operation.
+ * @param uFirstOperationWeight Weight for the first operation.
+ * @param ppProgressOut Output parameter for the IProgress object reference.
+ */
+ DECLR3CALLBACKMEMBER(uint32_t, pfnCreateProgress,(PCVBOXEXTPACKHLP pHlp, VBOXEXTPACK_IF_CS(IUnknown) *pInitiator,
+ const char *pcszDescription, uint32_t cOperations,
+ uint32_t uTotalOperationsWeight, const char *pcszFirstOperationDescription,
+ uint32_t uFirstOperationWeight, VBOXEXTPACK_IF_CS(IProgress) **ppProgressOut));
+
+ /**
+ * Checks if the Progress object is marked as canceled.
+ *
+ * @returns COM status code.
+ * @param pHlp Pointer to this helper structure.
+ * @param pProgress Pointer to the IProgress object reference returned
+ * by pfnCreateProgress.
+ * @param pfCanceled @c true if canceled, @c false otherwise.
+ */
+ DECLR3CALLBACKMEMBER(uint32_t, pfnGetCanceledProgress,(PCVBOXEXTPACKHLP pHlp, VBOXEXTPACK_IF_CS(IProgress) *pProgress,
+ bool *pfCanceled));
+
+ /**
+ * Updates the percentage value of the current operation of the
+ * Progress object.
+ *
+ * @returns COM status code.
+ * @param pHlp Pointer to this helper structure.
+ * @param pProgress Pointer to the IProgress object reference returned
+ * by pfnCreateProgress.
+ * @param uPercent Result of the overall task.
+ */
+ DECLR3CALLBACKMEMBER(uint32_t, pfnUpdateProgress,(PCVBOXEXTPACKHLP pHlp, VBOXEXTPACK_IF_CS(IProgress) *pProgress,
+ uint32_t uPercent));
+
+ /**
+ * Signals that the current operation is successfully completed and
+ * advances to the next operation. The operation percentage is reset
+ * to 0.
+ *
+ * If the operation count is exceeded this returns an error.
+ *
+ * @returns COM status code.
+ * @param pHlp Pointer to this helper structure.
+ * @param pProgress Pointer to the IProgress object reference returned
+ * by pfnCreateProgress.
+ * @param pcszNextOperationDescription Description of the next operation.
+ * @param uNextOperationWeight Weight for the next operation.
+ */
+ DECLR3CALLBACKMEMBER(uint32_t, pfnNextOperationProgress,(PCVBOXEXTPACKHLP pHlp, VBOXEXTPACK_IF_CS(IProgress) *pProgress,
+ const char *pcszNextOperationDescription,
+ uint32_t uNextOperationWeight));
+
+ /**
+ * Waits until the other task is completed (including all sub-operations)
+ * and forward all changes from the other progress to this progress. This
+ * means sub-operation number, description, percent and so on.
+ *
+ * The caller is responsible for having at least the same count of
+ * sub-operations in this progress object as there are in the other
+ * progress object.
+ *
+ * If the other progress object supports cancel and this object gets any
+ * cancel request (when here enabled as well), it will be forwarded to
+ * the other progress object.
+ *
+ * Error information is automatically preserved (by transferring it to
+ * the current thread's error information). If the caller wants to set it
+ * as the completion state of this progress it needs to be done separately.
+ *
+ * @returns COM status code.
+ * @param pHlp Pointer to this helper structure.
+ * @param pProgress Pointer to the IProgress object reference returned
+ * by pfnCreateProgress.
+ * @param pProgressOther Pointer to an IProgress object reference, the one
+ * to be waited for.
+ * @param cTimeoutMS Timeout in milliseconds, 0 for indefinite wait.
+ */
+ DECLR3CALLBACKMEMBER(uint32_t, pfnWaitOtherProgress,(PCVBOXEXTPACKHLP pHlp, VBOXEXTPACK_IF_CS(IProgress) *pProgress,
+ VBOXEXTPACK_IF_CS(IProgress) *pProgressOther,
+ uint32_t cTimeoutMS));
+
+ /**
+ * Marks the whole task as complete and sets the result code.
+ *
+ * If the result code indicates a failure then this method will store
+ * the currently set COM error info from the current thread in the
+ * the errorInfo attribute of this Progress object instance. If there
+ * is no error information available then an error is returned.
+ *
+ * If the result code indicates success then the task is terminated,
+ * without paying attention to the current operation being the last.
+ *
+ * Note that this must be called only once for the given Progress
+ * object. Subsequent calls will return errors.
+ *
+ * @returns COM status code.
+ * @param pHlp Pointer to this helper structure.
+ * @param pProgress Pointer to the IProgress object reference returned
+ * by pfnCreateProgress.
+ * @param uResultCode Result of the overall task.
+ */
+ DECLR3CALLBACKMEMBER(uint32_t, pfnCompleteProgress,(PCVBOXEXTPACKHLP pHlp, VBOXEXTPACK_IF_CS(IProgress) *pProgress,
+ uint32_t uResultCode));
+
+ DECLR3CALLBACKMEMBER(int, pfnReserved1,(PCVBOXEXTPACKHLP pHlp)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved2,(PCVBOXEXTPACKHLP pHlp)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved3,(PCVBOXEXTPACKHLP pHlp)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved4,(PCVBOXEXTPACKHLP pHlp)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved5,(PCVBOXEXTPACKHLP pHlp)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved6,(PCVBOXEXTPACKHLP pHlp)); /**< Reserved for minor structure revisions. */
+
+ /** End of structure marker (VBOXEXTPACKHLP_VERSION). */
+ uint32_t u32EndMarker;
+} VBOXEXTPACKHLP;
+/** Current version of the VBOXEXTPACKHLP structure. */
+#define VBOXEXTPACKHLP_VERSION RT_MAKE_U32(3, 0)
+
+
+/** Pointer to the extension pack callback table. */
+typedef struct VBOXEXTPACKREG const *PCVBOXEXTPACKREG;
+/**
+ * Callback table returned by VBoxExtPackRegister.
+ *
+ * All the callbacks are called the context of the per-user service (VBoxSVC).
+ *
+ * This must be valid until the extension pack main module is unloaded.
+ */
+typedef struct VBOXEXTPACKREG
+{
+ /** Interface version.
+ * This is set to VBOXEXTPACKREG_VERSION. */
+ uint32_t u32Version;
+ /** The VirtualBox version this extension pack was built against. */
+ uint32_t uVBoxVersion;
+
+ /**
+ * Hook for doing setups after the extension pack was installed.
+ *
+ * @returns VBox status code.
+ * @retval VERR_EXTPACK_UNSUPPORTED_HOST_UNINSTALL if the extension pack
+ * requires some different host version or a prerequisite is
+ * missing from the host. Automatic uninstall will be attempted.
+ * Must set error info.
+ *
+ * @param pThis Pointer to this structure.
+ * @param pVirtualBox The VirtualBox interface.
+ * @param pErrInfo Where to return extended error information.
+ */
+ DECLCALLBACKMEMBER(int, pfnInstalled)(PCVBOXEXTPACKREG pThis, VBOXEXTPACK_IF_CS(IVirtualBox) *pVirtualBox,
+ PRTERRINFO pErrInfo);
+
+ /**
+ * Hook for cleaning up before the extension pack is uninstalled.
+ *
+ * @returns VBox status code.
+ * @param pThis Pointer to this structure.
+ * @param pVirtualBox The VirtualBox interface.
+ *
+ * @todo This is currently called holding locks making pVirtualBox
+ * relatively unusable.
+ */
+ DECLCALLBACKMEMBER(int, pfnUninstall)(PCVBOXEXTPACKREG pThis, VBOXEXTPACK_IF_CS(IVirtualBox) *pVirtualBox);
+
+ /**
+ * Hook for doing work after the VirtualBox object is ready.
+ *
+ * @param pThis Pointer to this structure.
+ * @param pVirtualBox The VirtualBox interface.
+ */
+ DECLCALLBACKMEMBER(void, pfnVirtualBoxReady)(PCVBOXEXTPACKREG pThis, VBOXEXTPACK_IF_CS(IVirtualBox) *pVirtualBox);
+
+ /**
+ * Hook for doing work before unloading.
+ *
+ * @param pThis Pointer to this structure.
+ *
+ * @remarks The helpers are not available at this point in time.
+ * @remarks This is not called on uninstall, then pfnUninstall will be the
+ * last callback.
+ */
+ DECLCALLBACKMEMBER(void, pfnUnload)(PCVBOXEXTPACKREG pThis);
+
+ /**
+ * Hook for changing the default VM configuration upon creation.
+ *
+ * @returns VBox status code.
+ * @param pThis Pointer to this structure.
+ * @param pVirtualBox The VirtualBox interface.
+ * @param pMachine The machine interface.
+ */
+ DECLCALLBACKMEMBER(int, pfnVMCreated)(PCVBOXEXTPACKREG pThis, VBOXEXTPACK_IF_CS(IVirtualBox) *pVirtualBox,
+ VBOXEXTPACK_IF_CS(IMachine) *pMachine);
+
+ /**
+ * Query the IUnknown interface to an object in the main module.
+ *
+ * @returns IUnknown pointer (referenced) on success, NULL on failure.
+ * @param pThis Pointer to this structure.
+ * @param pObjectId Pointer to the object ID (UUID).
+ */
+ DECLCALLBACKMEMBER(void *, pfnQueryObject)(PCVBOXEXTPACKREG pThis, PCRTUUID pObjectId);
+
+ DECLR3CALLBACKMEMBER(int, pfnReserved1,(PCVBOXEXTPACKREG pThis)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved2,(PCVBOXEXTPACKREG pThis)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved3,(PCVBOXEXTPACKREG pThis)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved4,(PCVBOXEXTPACKREG pThis)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved5,(PCVBOXEXTPACKREG pThis)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved6,(PCVBOXEXTPACKREG pThis)); /**< Reserved for minor structure revisions. */
+
+ /** Reserved for minor structure revisions. */
+ uint32_t uReserved7;
+
+ /** End of structure marker (VBOXEXTPACKREG_VERSION). */
+ uint32_t u32EndMarker;
+} VBOXEXTPACKREG;
+/** Current version of the VBOXEXTPACKREG structure. */
+#define VBOXEXTPACKREG_VERSION RT_MAKE_U32(2, 0)
+
+
+/**
+ * The VBoxExtPackRegister callback function.
+ *
+ * The Main API (as in VBoxSVC) will invoke this function after loading an
+ * extension pack Main module. Its job is to do version compatibility checking
+ * and returning the extension pack registration structure.
+ *
+ * @returns VBox status code.
+ * @param pHlp Pointer to the extension pack helper function
+ * table. This is valid until the module is unloaded.
+ * @param ppReg Where to return the pointer to the registration
+ * structure containing all the hooks. This structure
+ * be valid and unchanged until the module is unloaded
+ * (i.e. use some static const data for it).
+ * @param pErrInfo Where to return extended error information.
+ */
+typedef DECLCALLBACK(int) FNVBOXEXTPACKREGISTER(PCVBOXEXTPACKHLP pHlp, PCVBOXEXTPACKREG *ppReg, PRTERRINFO pErrInfo);
+/** Pointer to a FNVBOXEXTPACKREGISTER. */
+typedef FNVBOXEXTPACKREGISTER *PFNVBOXEXTPACKREGISTER;
+
+/** The name of the main module entry point. */
+#define VBOX_EXTPACK_MAIN_MOD_ENTRY_POINT "VBoxExtPackRegister"
+
+
+/** Pointer to the extension pack VM callback table. */
+typedef struct VBOXEXTPACKVMREG const *PCVBOXEXTPACKVMREG;
+/**
+ * Callback table returned by VBoxExtPackVMRegister.
+ *
+ * All the callbacks are called the context of a VM process.
+ *
+ * This must be valid until the extension pack main VM module is unloaded.
+ */
+typedef struct VBOXEXTPACKVMREG
+{
+ /** Interface version.
+ * This is set to VBOXEXTPACKVMREG_VERSION. */
+ uint32_t u32Version;
+ /** The VirtualBox version this extension pack was built against. */
+ uint32_t uVBoxVersion;
+
+ /**
+ * Hook for doing work after the Console object is ready.
+ *
+ * @param pThis Pointer to this structure.
+ * @param pConsole The Console interface.
+ */
+ DECLCALLBACKMEMBER(void, pfnConsoleReady)(PCVBOXEXTPACKVMREG pThis, VBOXEXTPACK_IF_CS(IConsole) *pConsole);
+
+ /**
+ * Hook for doing work before unloading.
+ *
+ * @param pThis Pointer to this structure.
+ *
+ * @remarks The helpers are not available at this point in time.
+ */
+ DECLCALLBACKMEMBER(void, pfnUnload)(PCVBOXEXTPACKVMREG pThis);
+
+ /**
+ * Hook for configuring the VMM for a VM.
+ *
+ * @returns VBox status code.
+ * @param pThis Pointer to this structure.
+ * @param pConsole The console interface.
+ * @param pVM The cross context VM structure.
+ */
+ DECLCALLBACKMEMBER(int, pfnVMConfigureVMM)(PCVBOXEXTPACKVMREG pThis, VBOXEXTPACK_IF_CS(IConsole) *pConsole, PVM pVM);
+
+ /**
+ * Hook for doing work right before powering on the VM.
+ *
+ * @returns VBox status code.
+ * @param pThis Pointer to this structure.
+ * @param pConsole The console interface.
+ * @param pVM The cross context VM structure.
+ */
+ DECLCALLBACKMEMBER(int, pfnVMPowerOn)(PCVBOXEXTPACKVMREG pThis, VBOXEXTPACK_IF_CS(IConsole) *pConsole, PVM pVM);
+
+ /**
+ * Hook for doing work after powering off the VM.
+ *
+ * @param pThis Pointer to this structure.
+ * @param pConsole The console interface.
+ * @param pVM The cross context VM structure. Can be NULL.
+ */
+ DECLCALLBACKMEMBER(void, pfnVMPowerOff)(PCVBOXEXTPACKVMREG pThis, VBOXEXTPACK_IF_CS(IConsole) *pConsole, PVM pVM);
+
+ /**
+ * Query the IUnknown interface to an object in the main VM module.
+ *
+ * @returns IUnknown pointer (referenced) on success, NULL on failure.
+ * @param pThis Pointer to this structure.
+ * @param pObjectId Pointer to the object ID (UUID).
+ */
+ DECLCALLBACKMEMBER(void *, pfnQueryObject)(PCVBOXEXTPACKVMREG pThis, PCRTUUID pObjectId);
+
+ DECLR3CALLBACKMEMBER(int, pfnReserved1,(PCVBOXEXTPACKVMREG pThis)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved2,(PCVBOXEXTPACKVMREG pThis)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved3,(PCVBOXEXTPACKVMREG pThis)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved4,(PCVBOXEXTPACKVMREG pThis)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved5,(PCVBOXEXTPACKVMREG pThis)); /**< Reserved for minor structure revisions. */
+ DECLR3CALLBACKMEMBER(int, pfnReserved6,(PCVBOXEXTPACKVMREG pThis)); /**< Reserved for minor structure revisions. */
+
+ /** Reserved for minor structure revisions. */
+ uint32_t uReserved7;
+
+ /** End of structure marker (VBOXEXTPACKVMREG_VERSION). */
+ uint32_t u32EndMarker;
+} VBOXEXTPACKVMREG;
+/** Current version of the VBOXEXTPACKVMREG structure. */
+#define VBOXEXTPACKVMREG_VERSION RT_MAKE_U32(2, 0)
+
+
+/**
+ * The VBoxExtPackVMRegister callback function.
+ *
+ * The Main API (in a VM process) will invoke this function after loading an
+ * extension pack VM module. Its job is to do version compatibility checking
+ * and returning the extension pack registration structure for a VM.
+ *
+ * @returns VBox status code.
+ * @param pHlp Pointer to the extension pack helper function
+ * table. This is valid until the module is unloaded.
+ * @param ppReg Where to return the pointer to the registration
+ * structure containing all the hooks. This structure
+ * be valid and unchanged until the module is unloaded
+ * (i.e. use some static const data for it).
+ * @param pErrInfo Where to return extended error information.
+ */
+typedef DECLCALLBACK(int) FNVBOXEXTPACKVMREGISTER(PCVBOXEXTPACKHLP pHlp, PCVBOXEXTPACKVMREG *ppReg, PRTERRINFO pErrInfo);
+/** Pointer to a FNVBOXEXTPACKVMREGISTER. */
+typedef FNVBOXEXTPACKVMREGISTER *PFNVBOXEXTPACKVMREGISTER;
+
+/** The name of the main VM module entry point. */
+#define VBOX_EXTPACK_MAIN_VM_MOD_ENTRY_POINT "VBoxExtPackVMRegister"
+
+
+/**
+ * Checks if extension pack interface version is compatible.
+ *
+ * @returns true if the do, false if they don't.
+ * @param u32Provider The provider version.
+ * @param u32User The user version.
+ */
+#define VBOXEXTPACK_IS_VER_COMPAT(u32Provider, u32User) \
+ ( VBOXEXTPACK_IS_MAJOR_VER_EQUAL(u32Provider, u32User) \
+ && (int32_t)RT_LOWORD(u32Provider) >= (int32_t)RT_LOWORD(u32User) ) /* stupid casts to shut up gcc */
+
+/**
+ * Check if two extension pack interface versions has the same major version.
+ *
+ * @returns true if the do, false if they don't.
+ * @param u32Ver1 The first version number.
+ * @param u32Ver2 The second version number.
+ */
+#define VBOXEXTPACK_IS_MAJOR_VER_EQUAL(u32Ver1, u32Ver2) (RT_HIWORD(u32Ver1) == RT_HIWORD(u32Ver2))
+
+#endif /* !VBOX_INCLUDED_ExtPack_ExtPack_h */
+