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diff --git a/include/VBox/vmm/cfgm.h b/include/VBox/vmm/cfgm.h
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+/** @file
+ * CFGM - Configuration Manager.
+ */
+
+/*
+ * Copyright (C) 2006-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef VBOX_INCLUDED_vmm_cfgm_h
+#define VBOX_INCLUDED_vmm_cfgm_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <VBox/types.h>
+#include <iprt/stdarg.h>
+
+/** @defgroup grp_cfgm The Configuration Manager API
+ * @ingroup grp_vmm
+ * @{
+ */
+
+/**
+ * Configuration manager value type.
+ */
+typedef enum CFGMVALUETYPE
+{
+ /** Integer value. */
+ CFGMVALUETYPE_INTEGER = 1,
+ /** String value. */
+ CFGMVALUETYPE_STRING,
+ /** Bytestring value. */
+ CFGMVALUETYPE_BYTES,
+ /** Password value, same as String but hides the content in dump. */
+ CFGMVALUETYPE_PASSWORD
+} CFGMVALUETYPE;
+/** Pointer to configuration manager property type. */
+typedef CFGMVALUETYPE *PCFGMVALUETYPE;
+
+
+
+RT_C_DECLS_BEGIN
+
+#ifdef IN_RING3
+/** @defgroup grp_cfgm_r3 The CFGM Host Context Ring-3 API
+ * @{
+ */
+
+typedef enum CFGMCONFIGTYPE
+{
+ /** pvConfig points to nothing, use defaults. */
+ CFGMCONFIGTYPE_NONE = 0,
+ /** pvConfig points to a IMachine interface. */
+ CFGMCONFIGTYPE_IMACHINE
+} CFGMCONFIGTYPE;
+
+
+/**
+ * CFGM init callback for constructing the configuration tree.
+ *
+ * This is called from the emulation thread, and the one interfacing the VM
+ * can make any necessary per-thread initializations at this point.
+ *
+ * @returns VBox status code.
+ * @param pUVM The user mode VM handle.
+ * @param pVM The cross context VM structure.
+ * @param pVMM The VMM R3 vtable.
+ * @param pvUser The argument supplied to VMR3Create().
+ */
+typedef DECLCALLBACKTYPE(int, FNCFGMCONSTRUCTOR,(PUVM pUVM, PVM pVM, PCVMMR3VTABLE pVMM, void *pvUser));
+/** Pointer to a FNCFGMCONSTRUCTOR(). */
+typedef FNCFGMCONSTRUCTOR *PFNCFGMCONSTRUCTOR;
+
+VMMR3DECL(int) CFGMR3Init(PVM pVM, PFNCFGMCONSTRUCTOR pfnCFGMConstructor, void *pvUser);
+VMMR3DECL(int) CFGMR3Term(PVM pVM);
+VMMR3DECL(int) CFGMR3ConstructDefaultTree(PVM pVM);
+
+VMMR3DECL(PCFGMNODE) CFGMR3CreateTree(PUVM pUVM);
+VMMR3DECL(int) CFGMR3DestroyTree(PCFGMNODE pRoot);
+VMMR3DECL(void) CFGMR3Dump(PCFGMNODE pRoot);
+VMMR3DECL(int) CFGMR3DuplicateSubTree(PCFGMNODE pRoot, PCFGMNODE *ppCopy);
+VMMR3DECL(int) CFGMR3ReplaceSubTree(PCFGMNODE pRoot, PCFGMNODE pNewRoot);
+VMMR3DECL(int) CFGMR3InsertSubTree(PCFGMNODE pNode, const char *pszName, PCFGMNODE pSubTree, PCFGMNODE *ppChild);
+VMMR3DECL(int) CFGMR3InsertNode(PCFGMNODE pNode, const char *pszName, PCFGMNODE *ppChild);
+VMMR3DECL(int) CFGMR3InsertNodeF(PCFGMNODE pNode, PCFGMNODE *ppChild,
+ const char *pszNameFormat, ...) RT_IPRT_FORMAT_ATTR(3, 4);
+VMMR3DECL(int) CFGMR3InsertNodeFV(PCFGMNODE pNode, PCFGMNODE *ppChild,
+ const char *pszNameFormat, va_list Args) RT_IPRT_FORMAT_ATTR(3, 0);
+VMMR3DECL(void) CFGMR3SetRestrictedRoot(PCFGMNODE pNode);
+VMMR3DECL(void) CFGMR3RemoveNode(PCFGMNODE pNode);
+VMMR3DECL(int) CFGMR3InsertInteger(PCFGMNODE pNode, const char *pszName, uint64_t u64Integer);
+VMMR3DECL(int) CFGMR3InsertString(PCFGMNODE pNode, const char *pszName, const char *pszString);
+VMMR3DECL(int) CFGMR3InsertStringN(PCFGMNODE pNode, const char *pszName, const char *pszString, size_t cchString);
+VMMR3DECL(int) CFGMR3InsertStringF(PCFGMNODE pNode, const char *pszName,
+ const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(3, 4);
+VMMR3DECL(int) CFGMR3InsertStringFV(PCFGMNODE pNode, const char *pszName,
+ const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(3, 0);
+VMMR3DECL(int) CFGMR3InsertStringW(PCFGMNODE pNode, const char *pszName, PCRTUTF16 pwszValue);
+VMMR3DECL(int) CFGMR3InsertBytes(PCFGMNODE pNode, const char *pszName, const void *pvBytes, size_t cbBytes);
+VMMR3DECL(int) CFGMR3InsertPassword(PCFGMNODE pNode, const char *pszName, const char *pszString);
+VMMR3DECL(int) CFGMR3InsertPasswordN(PCFGMNODE pNode, const char *pszName, const char *pszString, size_t cchString);
+VMMR3DECL(int) CFGMR3InsertValue(PCFGMNODE pNode, PCFGMLEAF pValue);
+VMMR3DECL(int) CFGMR3RemoveValue(PCFGMNODE pNode, const char *pszName);
+
+/** @name CFGMR3CopyTree flags.
+ * @{ */
+/** Reserved value disposition \#0. */
+#define CFGM_COPY_FLAGS_RESERVED_VALUE_DISP_0 UINT32_C(0x00000000)
+/** Reserved value disposition \#1. */
+#define CFGM_COPY_FLAGS_RESERVED_VALUE_DISP_1 UINT32_C(0x00000001)
+/** Replace exiting values. */
+#define CFGM_COPY_FLAGS_REPLACE_VALUES UINT32_C(0x00000002)
+/** Ignore exiting values. */
+#define CFGM_COPY_FLAGS_IGNORE_EXISTING_VALUES UINT32_C(0x00000003)
+/** Value disposition mask. */
+#define CFGM_COPY_FLAGS_VALUE_DISP_MASK UINT32_C(0x00000003)
+
+/** Replace exiting keys. */
+#define CFGM_COPY_FLAGS_RESERVED_KEY_DISP UINT32_C(0x00000000)
+/** Replace exiting keys. */
+#define CFGM_COPY_FLAGS_MERGE_KEYS UINT32_C(0x00000010)
+/** Replace exiting keys. */
+#define CFGM_COPY_FLAGS_REPLACE_KEYS UINT32_C(0x00000020)
+/** Ignore existing keys. */
+#define CFGM_COPY_FLAGS_IGNORE_EXISTING_KEYS UINT32_C(0x00000030)
+/** Key disposition. */
+#define CFGM_COPY_FLAGS_KEY_DISP_MASK UINT32_C(0x00000030)
+/** @} */
+VMMR3DECL(int) CFGMR3CopyTree(PCFGMNODE pDstTree, PCFGMNODE pSrcTree, uint32_t fFlags);
+
+VMMR3DECL(bool) CFGMR3Exists( PCFGMNODE pNode, const char *pszName);
+VMMR3DECL(int) CFGMR3QueryType( PCFGMNODE pNode, const char *pszName, PCFGMVALUETYPE penmType);
+VMMR3DECL(int) CFGMR3QuerySize( PCFGMNODE pNode, const char *pszName, size_t *pcb);
+VMMR3DECL(int) CFGMR3QueryInteger( PCFGMNODE pNode, const char *pszName, uint64_t *pu64);
+VMMR3DECL(int) CFGMR3QueryIntegerDef( PCFGMNODE pNode, const char *pszName, uint64_t *pu64, uint64_t u64Def);
+VMMR3DECL(int) CFGMR3QueryString( PCFGMNODE pNode, const char *pszName, char *pszString, size_t cchString);
+VMMR3DECL(int) CFGMR3QueryStringDef( PCFGMNODE pNode, const char *pszName, char *pszString, size_t cchString, const char *pszDef);
+VMMR3DECL(int) CFGMR3QueryPassword( PCFGMNODE pNode, const char *pszName, char *pszString, size_t cchString);
+VMMR3DECL(int) CFGMR3QueryPasswordDef( PCFGMNODE pNode, const char *pszName, char *pszString, size_t cchString, const char *pszDef);
+VMMR3DECL(int) CFGMR3QueryBytes( PCFGMNODE pNode, const char *pszName, void *pvData, size_t cbData);
+
+
+/** @name Helpers
+ * @{
+ */
+VMMR3DECL(int) CFGMR3QueryU64( PCFGMNODE pNode, const char *pszName, uint64_t *pu64);
+VMMR3DECL(int) CFGMR3QueryU64Def( PCFGMNODE pNode, const char *pszName, uint64_t *pu64, uint64_t u64Def);
+VMMR3DECL(int) CFGMR3QueryS64( PCFGMNODE pNode, const char *pszName, int64_t *pi64);
+VMMR3DECL(int) CFGMR3QueryS64Def( PCFGMNODE pNode, const char *pszName, int64_t *pi64, int64_t i64Def);
+VMMR3DECL(int) CFGMR3QueryU32( PCFGMNODE pNode, const char *pszName, uint32_t *pu32);
+VMMR3DECL(int) CFGMR3QueryU32Def( PCFGMNODE pNode, const char *pszName, uint32_t *pu32, uint32_t u32Def);
+VMMR3DECL(int) CFGMR3QueryS32( PCFGMNODE pNode, const char *pszName, int32_t *pi32);
+VMMR3DECL(int) CFGMR3QueryS32Def( PCFGMNODE pNode, const char *pszName, int32_t *pi32, int32_t i32Def);
+VMMR3DECL(int) CFGMR3QueryU16( PCFGMNODE pNode, const char *pszName, uint16_t *pu16);
+VMMR3DECL(int) CFGMR3QueryU16Def( PCFGMNODE pNode, const char *pszName, uint16_t *pu16, uint16_t u16Def);
+VMMR3DECL(int) CFGMR3QueryS16( PCFGMNODE pNode, const char *pszName, int16_t *pi16);
+VMMR3DECL(int) CFGMR3QueryS16Def( PCFGMNODE pNode, const char *pszName, int16_t *pi16, int16_t i16Def);
+VMMR3DECL(int) CFGMR3QueryU8( PCFGMNODE pNode, const char *pszName, uint8_t *pu8);
+VMMR3DECL(int) CFGMR3QueryU8Def( PCFGMNODE pNode, const char *pszName, uint8_t *pu8, uint8_t u8Def);
+VMMR3DECL(int) CFGMR3QueryS8( PCFGMNODE pNode, const char *pszName, int8_t *pi8);
+VMMR3DECL(int) CFGMR3QueryS8Def( PCFGMNODE pNode, const char *pszName, int8_t *pi8, int8_t i8Def);
+VMMR3DECL(int) CFGMR3QueryBool( PCFGMNODE pNode, const char *pszName, bool *pf);
+VMMR3DECL(int) CFGMR3QueryBoolDef( PCFGMNODE pNode, const char *pszName, bool *pf, bool fDef);
+VMMR3DECL(int) CFGMR3QueryPort( PCFGMNODE pNode, const char *pszName, PRTIOPORT pPort);
+VMMR3DECL(int) CFGMR3QueryPortDef( PCFGMNODE pNode, const char *pszName, PRTIOPORT pPort, RTIOPORT PortDef);
+VMMR3DECL(int) CFGMR3QueryUInt( PCFGMNODE pNode, const char *pszName, unsigned int *pu);
+VMMR3DECL(int) CFGMR3QueryUIntDef( PCFGMNODE pNode, const char *pszName, unsigned int *pu, unsigned int uDef);
+VMMR3DECL(int) CFGMR3QuerySInt( PCFGMNODE pNode, const char *pszName, signed int *pi);
+VMMR3DECL(int) CFGMR3QuerySIntDef( PCFGMNODE pNode, const char *pszName, signed int *pi, signed int iDef);
+VMMR3DECL(int) CFGMR3QueryGCPtr( PCFGMNODE pNode, const char *pszName, PRTGCPTR pGCPtr);
+VMMR3DECL(int) CFGMR3QueryGCPtrDef( PCFGMNODE pNode, const char *pszName, PRTGCPTR pGCPtr, RTGCPTR GCPtrDef);
+VMMR3DECL(int) CFGMR3QueryGCPtrU( PCFGMNODE pNode, const char *pszName, PRTGCUINTPTR pGCPtr);
+VMMR3DECL(int) CFGMR3QueryGCPtrUDef( PCFGMNODE pNode, const char *pszName, PRTGCUINTPTR pGCPtr, RTGCUINTPTR GCPtrDef);
+VMMR3DECL(int) CFGMR3QueryGCPtrS( PCFGMNODE pNode, const char *pszName, PRTGCINTPTR pGCPtr);
+VMMR3DECL(int) CFGMR3QueryGCPtrSDef( PCFGMNODE pNode, const char *pszName, PRTGCINTPTR pGCPtr, RTGCINTPTR GCPtrDef);
+VMMR3DECL(int) CFGMR3QueryStringAlloc( PCFGMNODE pNode, const char *pszName, char **ppszString);
+VMMR3DECL(int) CFGMR3QueryStringAllocDef(PCFGMNODE pNode, const char *pszName, char **ppszString, const char *pszDef);
+
+/** @} */
+
+/** @name Tree Navigation and Enumeration.
+ * @{
+ */
+VMMR3DECL(PCFGMNODE) CFGMR3GetRoot(PVM pVM);
+VMMR3DECL(PCFGMNODE) CFGMR3GetRootU(PUVM pUVM);
+VMMR3DECL(PCFGMNODE) CFGMR3GetParent(PCFGMNODE pNode);
+VMMR3DECL(PCFGMNODE) CFGMR3GetParentEx(PVM pVM, PCFGMNODE pNode);
+VMMR3DECL(PCFGMNODE) CFGMR3GetChild(PCFGMNODE pNode, const char *pszPath);
+VMMR3DECL(PCFGMNODE) CFGMR3GetChildF(PCFGMNODE pNode, const char *pszPathFormat, ...) RT_IPRT_FORMAT_ATTR(2, 3);
+VMMR3DECL(PCFGMNODE) CFGMR3GetChildFV(PCFGMNODE pNode, const char *pszPathFormat, va_list Args) RT_IPRT_FORMAT_ATTR(3, 0);
+VMMR3DECL(PCFGMNODE) CFGMR3GetFirstChild(PCFGMNODE pNode);
+VMMR3DECL(PCFGMNODE) CFGMR3GetNextChild(PCFGMNODE pCur);
+VMMR3DECL(int) CFGMR3GetName(PCFGMNODE pCur, char *pszName, size_t cchName);
+VMMR3DECL(size_t) CFGMR3GetNameLen(PCFGMNODE pCur);
+VMMR3DECL(bool) CFGMR3AreChildrenValid(PCFGMNODE pNode, const char *pszzValid);
+VMMR3DECL(PCFGMLEAF) CFGMR3GetFirstValue(PCFGMNODE pCur);
+VMMR3DECL(PCFGMLEAF) CFGMR3GetNextValue(PCFGMLEAF pCur);
+VMMR3DECL(int) CFGMR3GetValueName(PCFGMLEAF pCur, char *pszName, size_t cchName);
+VMMR3DECL(size_t) CFGMR3GetValueNameLen(PCFGMLEAF pCur);
+VMMR3DECL(CFGMVALUETYPE) CFGMR3GetValueType(PCFGMLEAF pCur);
+VMMR3DECL(bool) CFGMR3AreValuesValid(PCFGMNODE pNode, const char *pszzValid);
+VMMR3DECL(int) CFGMR3ValidateConfig(PCFGMNODE pNode, const char *pszNode,
+ const char *pszValidValues, const char *pszValidNodes,
+ const char *pszWho, uint32_t uInstance);
+
+/** @} */
+
+
+/** @} */
+#endif /* IN_RING3 */
+
+
+RT_C_DECLS_END
+
+/** @} */
+
+#endif /* !VBOX_INCLUDED_vmm_cfgm_h */
+