Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1354 insertions, 0 deletions

diff --git a/include/VBox/vmm/ssm.h b/include/VBox/vmm/ssm.h
new file mode 100644
index 00000000..591b5d7e
--- /dev/null
+++ b/include/VBox/vmm/ssm.h
@@ -0,0 +1,1354 @@
+/** @file
+ * SSM - The Save State 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_ssm_h
+#define VBOX_INCLUDED_vmm_ssm_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <VBox/types.h>
+#include <VBox/vmm/tm.h>
+#include <VBox/vmm/vmapi.h>
+
+
+RT_C_DECLS_BEGIN
+
+/** @defgroup grp_ssm       The Saved State Manager API
+ * @ingroup grp_vmm
+ * @{
+ */
+
+/**
+ * Determine the major version of the SSM version. If the major SSM version of two snapshots is
+ * different, the snapshots are incompatible.
+ */
+#define SSM_VERSION_MAJOR(ver)                  ((ver) & 0xffff0000)
+
+/**
+ * Determine the minor version of the SSM version. If the major SSM version of two snapshots is
+ * the same, the code must handle incompatibilies between minor version changes (e.g. use dummy
+ * values for non-existent fields).
+ */
+#define SSM_VERSION_MINOR(ver)                  ((ver) & 0x0000ffff)
+
+/**
+ * Determine if the major version changed between two SSM versions.
+ */
+#define SSM_VERSION_MAJOR_CHANGED(ver1,ver2)    (SSM_VERSION_MAJOR(ver1) != SSM_VERSION_MAJOR(ver2))
+
+/** The special value for the final pass.  */
+#define SSM_PASS_FINAL                          UINT32_MAX
+
+
+#ifdef IN_RING3
+/** @defgroup grp_ssm_r3     The SSM Host Context Ring-3 API
+ * @{
+ */
+
+
+/**
+ * What to do after the save/load operation.
+ */
+typedef enum SSMAFTER
+{
+    /** Invalid. */
+    SSMAFTER_INVALID = 0,
+    /** Will resume the loaded state. */
+    SSMAFTER_RESUME,
+    /** Will destroy the VM after saving. */
+    SSMAFTER_DESTROY,
+    /** Will continue execution after saving the VM. */
+    SSMAFTER_CONTINUE,
+    /** Will teleport the VM.
+     * The source VM will be destroyed (then one saving), the destination VM
+     * will continue execution. */
+    SSMAFTER_TELEPORT,
+    /** Will debug the saved state.
+     * This is used to drop some of the stricter consitentcy checks so it'll
+     * load fine in the debugger or animator. */
+    SSMAFTER_DEBUG_IT,
+    /** The file was opened using SSMR3Open() and we have no idea what the plan is. */
+    SSMAFTER_OPENED
+} SSMAFTER;
+
+
+/** Pointer to a structure field description. */
+typedef struct SSMFIELD *PSSMFIELD;
+/** Pointer to a const  structure field description. */
+typedef const struct SSMFIELD *PCSSMFIELD;
+
+/**
+ * SSMFIELD Get/Put callback function.
+ *
+ * This is call for getting and putting the field it is associated with.  It's
+ * up to the callback to work the saved state correctly.
+ *
+ * @returns VBox status code.
+ *
+ * @param   pSSM            The saved state handle.
+ * @param   pField          The field that is being processed.
+ * @param   pvStruct        Pointer to the structure.
+ * @param   fFlags          SSMSTRUCT_FLAGS_XXX.
+ * @param   fGetOrPut       True if getting, false if putting.
+ * @param   pvUser          The user argument specified to SSMR3GetStructEx or
+ *                          SSMR3PutStructEx.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMFIELDGETPUT,(PSSMHANDLE pSSM, const struct SSMFIELD *pField, void *pvStruct,
+                                                uint32_t fFlags, bool fGetOrPut, void *pvUser));
+/** Pointer to a SSMFIELD Get/Put callback. */
+typedef FNSSMFIELDGETPUT *PFNSSMFIELDGETPUT;
+
+/**
+ * SSM field transformers.
+ *
+ * These are stored in the SSMFIELD::pfnGetPutOrTransformer and must therefore
+ * have values outside the valid pointer range.
+ */
+typedef enum SSMFIELDTRANS
+{
+    /** Invalid. */
+    SSMFIELDTRANS_INVALID = 0,
+    /** No transformation. */
+    SSMFIELDTRANS_NO_TRANSFORMATION,
+    /** Guest context (GC) physical address. */
+    SSMFIELDTRANS_GCPHYS,
+    /** Guest context (GC) virtual address. */
+    SSMFIELDTRANS_GCPTR,
+    /** Raw-mode context (RC) virtual address. */
+    SSMFIELDTRANS_RCPTR,
+    /** Array of raw-mode context (RC) virtual addresses. */
+    SSMFIELDTRANS_RCPTR_ARRAY,
+    /** Host context (HC) virtual address used as a NULL indicator. See
+     * SSMFIELD_ENTRY_HCPTR_NI. */
+    SSMFIELDTRANS_HCPTR_NI,
+    /** Array of SSMFIELDTRANS_HCPTR_NI. */
+    SSMFIELDTRANS_HCPTR_NI_ARRAY,
+    /** Host context (HC) virtual address used to hold a unsigned 32-bit value. */
+    SSMFIELDTRANS_HCPTR_HACK_U32,
+    /** Load a 32-bit unsigned filed from the state and zero extend it into a 64-bit
+     * structure member. */
+    SSMFIELDTRANS_U32_ZX_U64,
+
+    /** Ignorable field. See SSMFIELD_ENTRY_IGNORE. */
+    SSMFIELDTRANS_IGNORE,
+    /** Ignorable guest context (GC) physical address. */
+    SSMFIELDTRANS_IGN_GCPHYS,
+    /** Ignorable guest context (GC) virtual address. */
+    SSMFIELDTRANS_IGN_GCPTR,
+    /** Ignorable raw-mode context (RC) virtual address. */
+    SSMFIELDTRANS_IGN_RCPTR,
+    /** Ignorable host context (HC) virtual address.  */
+    SSMFIELDTRANS_IGN_HCPTR,
+
+    /** Old field.
+     * Save as zeros and skip on restore (nowhere to restore it any longer).  */
+    SSMFIELDTRANS_OLD,
+    /** Old guest context (GC) physical address. */
+    SSMFIELDTRANS_OLD_GCPHYS,
+    /** Old guest context (GC) virtual address. */
+    SSMFIELDTRANS_OLD_GCPTR,
+    /** Old raw-mode context (RC) virtual address. */
+    SSMFIELDTRANS_OLD_RCPTR,
+    /** Old host context (HC) virtual address.  */
+    SSMFIELDTRANS_OLD_HCPTR,
+    /** Old host context specific padding.
+     * The lower word is the size of 32-bit hosts, the upper for 64-bit hosts. */
+    SSMFIELDTRANS_OLD_PAD_HC,
+    /** Old padding specific to the 32-bit Microsoft C Compiler. */
+    SSMFIELDTRANS_OLD_PAD_MSC32,
+
+    /** Padding that differs between 32-bit and 64-bit hosts.
+     * The first  byte of SSMFIELD::cb contains the size for 32-bit hosts.
+     * The second byte of SSMFIELD::cb contains the size for 64-bit hosts.
+     * The upper  word of SSMFIELD::cb contains the actual field size.
+     */
+    SSMFIELDTRANS_PAD_HC,
+    /** Padding for 32-bit hosts only.
+     * SSMFIELD::cb has the same format as for SSMFIELDTRANS_PAD_HC. */
+    SSMFIELDTRANS_PAD_HC32,
+    /** Padding for 64-bit hosts only.
+     * SSMFIELD::cb has the same format as for SSMFIELDTRANS_PAD_HC. */
+    SSMFIELDTRANS_PAD_HC64,
+    /** Automatic compiler padding that may differ between 32-bit and
+     * 64-bit hosts. SSMFIELD::cb has the same format as for
+     * SSMFIELDTRANS_PAD_HC. */
+    SSMFIELDTRANS_PAD_HC_AUTO,
+    /** Automatic compiler padding specific to the 32-bit Microsoft C
+     * compiler.
+     * SSMFIELD::cb has the same format as for SSMFIELDTRANS_PAD_HC. */
+    SSMFIELDTRANS_PAD_MSC32_AUTO
+} SSMFIELDTRANS;
+
+/** Tests if it's a padding field with the special SSMFIELD::cb format.
+ * @returns true / false.
+ * @param   pfn     The SSMFIELD::pfnGetPutOrTransformer value.
+ */
+#define SSMFIELDTRANS_IS_PADDING(pfn)   \
+    (   (uintptr_t)(pfn) >= SSMFIELDTRANS_PAD_HC && (uintptr_t)(pfn) <= SSMFIELDTRANS_PAD_MSC32_AUTO )
+
+/** Tests if it's an entry for an old field.
+ *
+ * @returns true / false.
+ * @param   pfn     The SSMFIELD::pfnGetPutOrTransformer value.
+ */
+#define SSMFIELDTRANS_IS_OLD(pfn)   \
+    (   (uintptr_t)(pfn) >= SSMFIELDTRANS_OLD && (uintptr_t)(pfn) <= SSMFIELDTRANS_OLD_PAD_MSC32 )
+
+/**
+ * A structure field description.
+ */
+typedef struct SSMFIELD
+{
+    /** Getter and putter callback or transformer index. */
+    PFNSSMFIELDGETPUT   pfnGetPutOrTransformer;
+    /** Field offset into the structure. */
+    uint32_t            off;
+    /** The size of the field. */
+    uint32_t            cb;
+    /** This field was first saved by this unit version number. */
+    uint32_t            uFirstVer;
+    /** Field name. */
+    const char         *pszName;
+} SSMFIELD;
+
+/** Emit a SSMFIELD array entry.
+ * @internal  */
+#define SSMFIELD_ENTRY_INT(Name, off, cb, enmTransformer, uFirstVer) \
+    { (PFNSSMFIELDGETPUT)(uintptr_t)(enmTransformer), (uint32_t)(off), (uint32_t)(cb), (uFirstVer), Name }
+/** Emit a SSMFIELD array entry.
+ * @internal  */
+#define SSMFIELD_ENTRY_TF_INT(Type, Field, enmTransformer, uFirstVer) \
+    SSMFIELD_ENTRY_INT(#Type "::" #Field, RT_UOFFSETOF(Type, Field), RT_SIZEOFMEMB(Type, Field), enmTransformer, uFirstVer)
+/** Emit a SSMFIELD array entry for an old field.
+ * @internal  */
+#define SSMFIELD_ENTRY_OLD_INT(Field, cb, enmTransformer) \
+    SSMFIELD_ENTRY_INT("old::" #Field, UINT32_MAX / 2, (cb), enmTransformer, 0)
+/** Emit a SSMFIELD array entry for an alignment padding.
+ * @internal  */
+#define SSMFIELD_ENTRY_PAD_INT(Type, Field, cb32, cb64, enmTransformer) \
+    SSMFIELD_ENTRY_INT(#Type "::" #Field, RT_UOFFSETOF(Type, Field), \
+                       (RT_SIZEOFMEMB(Type, Field) << 16) | (cb32) | ((cb64) << 8), enmTransformer, 0)
+/** Emit a SSMFIELD array entry for an alignment padding.
+ * @internal  */
+#define SSMFIELD_ENTRY_PAD_OTHER_INT(Type, Field, cb32, cb64, enmTransformer) \
+    SSMFIELD_ENTRY_INT(#Type "::" #Field, UINT32_MAX / 2, 0 | (cb32) | ((cb64) << 8), enmTransformer, 0)
+
+/** Emit a SSMFIELD array entry. */
+#define SSMFIELD_ENTRY(Type, Field)                 SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_NO_TRANSFORMATION, 0)
+/** Emit a SSMFIELD array entry with first version. */
+#define SSMFIELD_ENTRY_VER(Type, Field, uFirstVer)  SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_NO_TRANSFORMATION, uFirstVer)
+/** Emit a SSMFIELD array entry for a custom made field.  This is intended
+ *  for working around bitfields in old structures. */
+#define SSMFIELD_ENTRY_CUSTOM(Field, off, cb)       SSMFIELD_ENTRY_INT("custom::" #Field, off, cb, \
+                                                                       SSMFIELDTRANS_NO_TRANSFORMATION, 0)
+/** Emit a SSMFIELD array entry for a RTGCPHYS type. */
+#define SSMFIELD_ENTRY_GCPHYS(Type, Field)          SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_GCPHYS, 0)
+/** Emit a SSMFIELD array entry for a RTGCPTR type. */
+#define SSMFIELD_ENTRY_GCPTR(Type, Field)           SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_GCPTR, 0)
+/** Emit a SSMFIELD array entry for a raw-mode context pointer. */
+#define SSMFIELD_ENTRY_RCPTR(Type, Field)           SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_RCPTR, 0)
+/** Emit a SSMFIELD array entry for a raw-mode context pointer. */
+#define SSMFIELD_ENTRY_RCPTR_ARRAY(Type, Field)     SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_RCPTR_ARRAY, 0)
+/** Emit a SSMFIELD array entry for a ring-0 or ring-3 pointer type that is only
+ * of interest as a NULL indicator.
+ *
+ * This is always restored as a 0 (NULL) or 1 value.  When
+ * SSMSTRUCT_FLAGS_DONT_IGNORE is set, the pointer will be saved in its
+ * entirety, when clear it will be saved as a boolean. */
+#define SSMFIELD_ENTRY_HCPTR_NI(Type, Field)        SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_HCPTR_NI, 0)
+/** Same as SSMFIELD_ENTRY_HCPTR_NI, except it's an array of the buggers. */
+#define SSMFIELD_ENTRY_HCPTR_NI_ARRAY(Type, Field)  SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_HCPTR_NI_ARRAY, 0)
+/** Emit a SSMFIELD array entry for a ring-0 or ring-3 pointer type that has
+ * been hacked such that it will never exceed 32-bit.  No sign extending. */
+#define SSMFIELD_ENTRY_HCPTR_HACK_U32(Type, Field)  SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_HCPTR_HACK_U32, 0)
+/** Emit a SSMFIELD array entry for loading a 32-bit field into a 64-bit
+ * structure member, zero extending the value. */
+#define SSMFIELD_ENTRY_U32_ZX_U64(Type, Field)      SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_U32_ZX_U64, 0)
+
+/** Emit a SSMFIELD array entry for a field that can be ignored.
+ * It is stored as zeros if SSMSTRUCT_FLAGS_DONT_IGNORE is specified to
+ * SSMR3PutStructEx.  The member is never touched upon restore. */
+#define SSMFIELD_ENTRY_IGNORE(Type, Field)          SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_IGNORE, 0)
+/** Emit a SSMFIELD array entry for an ignorable RTGCPHYS type. */
+#define SSMFIELD_ENTRY_IGN_GCPHYS(Type, Field)      SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_IGN_GCPHYS, 0)
+/** Emit a SSMFIELD array entry for an ignorable RTGCPHYS type. */
+#define SSMFIELD_ENTRY_IGN_GCPTR(Type, Field)       SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_IGN_GCPTR, 0)
+/** Emit a SSMFIELD array entry for an ignorable raw-mode context pointer. */
+#define SSMFIELD_ENTRY_IGN_RCPTR(Type, Field)       SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_IGN_RCPTR, 0)
+/** Emit a SSMFIELD array entry for an ignorable ring-3 or/and ring-0 pointer. */
+#define SSMFIELD_ENTRY_IGN_HCPTR(Type, Field)       SSMFIELD_ENTRY_TF_INT(Type, Field, SSMFIELDTRANS_IGN_HCPTR, 0)
+
+/** Emit a SSMFIELD array entry for an old field that should be ignored now.
+ * It is stored as zeros and skipped on load. */
+#define SSMFIELD_ENTRY_OLD(Field, cb)               SSMFIELD_ENTRY_OLD_INT(Field, cb,               SSMFIELDTRANS_OLD)
+/** Same as SSMFIELD_ENTRY_IGN_GCPHYS, except there is no structure field. */
+#define SSMFIELD_ENTRY_OLD_GCPHYS(Field)            SSMFIELD_ENTRY_OLD_INT(Field, sizeof(RTGCPHYS), SSMFIELDTRANS_OLD_GCPHYS)
+/** Same as SSMFIELD_ENTRY_IGN_GCPTR, except there is no structure field. */
+#define SSMFIELD_ENTRY_OLD_GCPTR(Field)             SSMFIELD_ENTRY_OLD_INT(Field, sizeof(RTGCPTR),  SSMFIELDTRANS_OLD_GCPTR)
+/** Same as SSMFIELD_ENTRY_IGN_RCPTR, except there is no structure field. */
+#define SSMFIELD_ENTRY_OLD_RCPTR(Field)             SSMFIELD_ENTRY_OLD_INT(Field, sizeof(RTRCPTR),  SSMFIELDTRANS_OLD_RCPTR)
+/** Same as SSMFIELD_ENTRY_IGN_HCPTR, except there is no structure field. */
+#define SSMFIELD_ENTRY_OLD_HCPTR(Field)             SSMFIELD_ENTRY_OLD_INT(Field, sizeof(RTHCPTR),  SSMFIELDTRANS_OLD_HCPTR)
+/** Same as SSMFIELD_ENTRY_PAD_HC, except there is no structure field. */
+#define SSMFIELD_ENTRY_OLD_PAD_HC(Field, cb32, cb64) \
+    SSMFIELD_ENTRY_OLD_INT(Field, RT_MAKE_U32((cb32), (cb64)), SSMFIELDTRANS_OLD_PAD_HC)
+/** Same as SSMFIELD_ENTRY_PAD_HC64, except there is no structure field. */
+#define SSMFIELD_ENTRY_OLD_PAD_HC64(Field, cb)      SSMFIELD_ENTRY_OLD_PAD_HC(Field, 0, cb)
+/** Same as SSMFIELD_ENTRY_PAD_HC32, except there is no structure field. */
+#define SSMFIELD_ENTRY_OLD_PAD_HC32(Field, cb)      SSMFIELD_ENTRY_OLD_PAD_HC(Field, cb, 0)
+/** Same as SSMFIELD_ENTRY_PAD_HC, except there is no structure field. */
+#define SSMFIELD_ENTRY_OLD_PAD_MSC32(Field, cb)     SSMFIELD_ENTRY_OLD_INT(Field, cb,               SSMFIELDTRANS_OLD_PAD_MSC32)
+
+/** Emit a SSMFIELD array entry for a padding that differs in size between
+ * 64-bit and 32-bit hosts. */
+#define SSMFIELD_ENTRY_PAD_HC(Type, Field, cb32, cb64) SSMFIELD_ENTRY_PAD_INT(   Type, Field, cb32, cb64, SSMFIELDTRANS_PAD_HC)
+/** Emit a SSMFIELD array entry for a padding that is exclusive to 64-bit hosts. */
+#if HC_ARCH_BITS == 64
+# define SSMFIELD_ENTRY_PAD_HC64(Type, Field, cb)   SSMFIELD_ENTRY_PAD_INT(      Type, Field, 0, cb, SSMFIELDTRANS_PAD_HC64)
+#else
+# define SSMFIELD_ENTRY_PAD_HC64(Type, Field, cb)   SSMFIELD_ENTRY_PAD_OTHER_INT(Type, Field, 0, cb, SSMFIELDTRANS_PAD_HC64)
+#endif
+/** Emit a SSMFIELD array entry for a 32-bit padding for on 64-bits hosts.  */
+#if HC_ARCH_BITS == 32
+# define SSMFIELD_ENTRY_PAD_HC32(Type, Field, cb)   SSMFIELD_ENTRY_PAD_INT(      Type, Field, cb, 0, SSMFIELDTRANS_PAD_HC32)
+#else
+# define SSMFIELD_ENTRY_PAD_HC32(Type, Field, cb)   SSMFIELD_ENTRY_PAD_OTHER_INT(Type, Field, cb, 0, SSMFIELDTRANS_PAD_HC32)
+#endif
+/** Emit a SSMFIELD array entry for an automatic compiler padding that may
+ * differ in size between 64-bit and 32-bit hosts. */
+#if HC_ARCH_BITS == 64
+# define SSMFIELD_ENTRY_PAD_HC_AUTO(cb32, cb64) \
+    { \
+        (PFNSSMFIELDGETPUT)(uintptr_t)(SSMFIELDTRANS_PAD_HC_AUTO), \
+        UINT32_MAX / 2,  (cb64 << 16) | (cb32) | ((cb64) << 8),  0, "<compiler-padding>" \
+    }
+#else
+# define SSMFIELD_ENTRY_PAD_HC_AUTO(cb32, cb64) \
+    { \
+        (PFNSSMFIELDGETPUT)(uintptr_t)(SSMFIELDTRANS_PAD_HC_AUTO), \
+        UINT32_MAX / 2,  (cb32 << 16) | (cb32) | ((cb64) << 8),  0, "<compiler-padding>" \
+    }
+#endif
+/** Emit a SSMFIELD array entry for an automatic compiler padding that is unique
+ * to the 32-bit microsoft compiler.  This is usually used together with
+ * SSMFIELD_ENTRY_PAD_HC*. */
+#if HC_ARCH_BITS == 32 && defined(_MSC_VER)
+# define SSMFIELD_ENTRY_PAD_MSC32_AUTO(cb) \
+    { \
+        (PFNSSMFIELDGETPUT)(uintptr_t)(SSMFIELDTRANS_PAD_MSC32_AUTO), \
+        UINT32_MAX / 2, ((cb) << 16) | (cb), 0, "<msc32-padding>" \
+    }
+#else
+# define SSMFIELD_ENTRY_PAD_MSC32_AUTO(cb) \
+    { \
+        (PFNSSMFIELDGETPUT)(uintptr_t)(SSMFIELDTRANS_PAD_MSC32_AUTO), \
+        UINT32_MAX / 2, (cb), 0, "<msc32-padding>" \
+    }
+#endif
+
+/** Emit a SSMFIELD array entry for a field with a custom callback. */
+#define SSMFIELD_ENTRY_CALLBACK(Type, Field, pfnGetPut) \
+    { (pfnGetPut), RT_UOFFSETOF(Type, Field), RT_SIZEOFMEMB(Type, Field), 0, #Type "::" #Field }
+/** Emit the terminating entry of a SSMFIELD array. */
+#define SSMFIELD_ENTRY_TERM() \
+    { (PFNSSMFIELDGETPUT)(uintptr_t)SSMFIELDTRANS_INVALID, UINT32_MAX, UINT32_MAX, UINT32_MAX, NULL }
+
+
+/** @name SSMR3GetStructEx and SSMR3PutStructEx flags.
+ * @{ */
+/** The field descriptors must exactly cover the entire struct, A to Z. */
+#define SSMSTRUCT_FLAGS_FULL_STRUCT         RT_BIT_32(0)
+/** No start and end markers, just the raw bits. */
+#define SSMSTRUCT_FLAGS_NO_MARKERS          RT_BIT_32(1)
+/** Do not ignore any ignorable fields. */
+#define SSMSTRUCT_FLAGS_DONT_IGNORE         RT_BIT_32(2)
+/** Saved using SSMR3PutMem, don't be too strict. */
+#define SSMSTRUCT_FLAGS_SAVED_AS_MEM        RT_BIT_32(3)
+/** No introductory structure marker.  Use when splitting up structures.  */
+#define SSMSTRUCT_FLAGS_NO_LEAD_MARKER      RT_BIT_32(4)
+/** No trailing structure marker.  Use when splitting up structures.  */
+#define SSMSTRUCT_FLAGS_NO_TAIL_MARKER      RT_BIT_32(5)
+
+/** Band-aid for old SSMR3PutMem/SSMR3GetMem of structurs with host pointers.
+ * @remarks This type is normally only used up to the first changes to the
+ *          structures take place in order to make sure the conversion from
+ *          SSMR3PutMem to field descriptors went smoothly.  Replace with
+ *          SSMSTRUCT_FLAGS_MEM_BAND_AID_RELAXED when changing the structure. */
+#define SSMSTRUCT_FLAGS_MEM_BAND_AID        (  SSMSTRUCT_FLAGS_DONT_IGNORE | SSMSTRUCT_FLAGS_FULL_STRUCT \
+                                             | SSMSTRUCT_FLAGS_NO_MARKERS  | SSMSTRUCT_FLAGS_SAVED_AS_MEM)
+/** Band-aid for old SSMR3PutMem/SSMR3GetMem of structurs with host
+ *  pointers, with relaxed checks. */
+#define SSMSTRUCT_FLAGS_MEM_BAND_AID_RELAXED (  SSMSTRUCT_FLAGS_DONT_IGNORE \
+                                              | SSMSTRUCT_FLAGS_NO_MARKERS  | SSMSTRUCT_FLAGS_SAVED_AS_MEM)
+/** Mask of the valid bits. */
+#define SSMSTRUCT_FLAGS_VALID_MASK          UINT32_C(0x0000003f)
+/** @} */
+
+
+/** The PDM Device callback variants.
+ * @{
+ */
+
+/**
+ * Prepare state live save operation.
+ *
+ * @returns VBox status code.
+ * @param   pDevIns         Device instance of the device which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @remarks The caller enters the device critical section prior to the call.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDEVLIVEPREP,(PPDMDEVINS pDevIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMDEVLIVEPREP() function. */
+typedef FNSSMDEVLIVEPREP *PFNSSMDEVLIVEPREP;
+
+/**
+ * Execute state live save operation.
+ *
+ * This will be called repeatedly until all units vote that the live phase has
+ * been concluded.
+ *
+ * @returns VBox status code.
+ * @param   pDevIns         Device instance of the device which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @param   uPass           The pass.
+ * @remarks The caller enters the device critical section prior to the call.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDEVLIVEEXEC,(PPDMDEVINS pDevIns, PSSMHANDLE pSSM, uint32_t uPass));
+/** Pointer to a FNSSMDEVLIVEEXEC() function. */
+typedef FNSSMDEVLIVEEXEC *PFNSSMDEVLIVEEXEC;
+
+/**
+ * Vote on whether the live part of the saving has been concluded.
+ *
+ * The vote stops once a unit has vetoed the decision, so don't rely upon this
+ * being called every time.
+ *
+ * @returns VBox status code.
+ * @retval  VINF_SUCCESS if done.
+ * @retval  VINF_SSM_VOTE_FOR_ANOTHER_PASS if another pass is needed.
+ * @retval  VINF_SSM_VOTE_DONE_DONT_CALL_AGAIN if the live saving of the unit is
+ *          done and there is not need calling it again before the final pass.
+ * @retval  VERR_SSM_VOTE_FOR_GIVING_UP if its time to give up.
+ *
+ * @param   pDevIns         Device instance of the device which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @param   uPass           The data pass.
+ * @remarks The caller enters the device critical section prior to the call.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDEVLIVEVOTE,(PPDMDEVINS pDevIns, PSSMHANDLE pSSM, uint32_t uPass));
+/** Pointer to a FNSSMDEVLIVEVOTE() function. */
+typedef FNSSMDEVLIVEVOTE *PFNSSMDEVLIVEVOTE;
+
+/**
+ * Prepare state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pDevIns         Device instance of the device which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @remarks The caller enters the device critical section prior to the call.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDEVSAVEPREP,(PPDMDEVINS pDevIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMDEVSAVEPREP() function. */
+typedef FNSSMDEVSAVEPREP *PFNSSMDEVSAVEPREP;
+
+/**
+ * Execute state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pDevIns         Device instance of the device which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @remarks The caller enters the device critical section prior to the call.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDEVSAVEEXEC,(PPDMDEVINS pDevIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMDEVSAVEEXEC() function. */
+typedef FNSSMDEVSAVEEXEC *PFNSSMDEVSAVEEXEC;
+
+/**
+ * Done state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pDevIns         Device instance of the device which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @remarks The caller enters the device critical section prior to the call.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDEVSAVEDONE,(PPDMDEVINS pDevIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMDEVSAVEDONE() function. */
+typedef FNSSMDEVSAVEDONE *PFNSSMDEVSAVEDONE;
+
+/**
+ * Prepare state load operation.
+ *
+ * @returns VBox status code.
+ * @param   pDevIns         Device instance of the device which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @remarks The caller enters the device critical section prior to the call.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDEVLOADPREP,(PPDMDEVINS pDevIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMDEVLOADPREP() function. */
+typedef FNSSMDEVLOADPREP *PFNSSMDEVLOADPREP;
+
+/**
+ * Execute state load operation.
+ *
+ * @returns VBox status code.
+ * @param   pDevIns         Device instance of the device which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @param   uVersion        Data layout version.
+ * @param   uPass           The pass. This is always SSM_PASS_FINAL for units
+ *                          that doesn't specify a pfnSaveLive callback.
+ * @remarks The caller enters the device critical section prior to the call.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDEVLOADEXEC,(PPDMDEVINS pDevIns, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass));
+/** Pointer to a FNSSMDEVLOADEXEC() function. */
+typedef FNSSMDEVLOADEXEC *PFNSSMDEVLOADEXEC;
+
+/**
+ * Done state load operation.
+ *
+ * @returns VBox load code.
+ * @param   pDevIns         Device instance of the device which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @remarks The caller enters the device critical section prior to the call.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDEVLOADDONE,(PPDMDEVINS pDevIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMDEVLOADDONE() function. */
+typedef FNSSMDEVLOADDONE *PFNSSMDEVLOADDONE;
+
+/** @} */
+
+
+/** The PDM USB device callback variants.
+ * @{
+ */
+
+/**
+ * Prepare state live save operation.
+ *
+ * @returns VBox status code.
+ * @param   pUsbIns         The USB device instance of the USB device which
+ *                          registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMUSBLIVEPREP,(PPDMUSBINS pUsbIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMUSBLIVEPREP() function. */
+typedef FNSSMUSBLIVEPREP *PFNSSMUSBLIVEPREP;
+
+/**
+ * Execute state live save operation.
+ *
+ * This will be called repeatedly until all units vote that the live phase has
+ * been concluded.
+ *
+ * @returns VBox status code.
+ * @param   pUsbIns         The USB device instance of the USB device which
+ *                          registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @param   uPass           The pass.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMUSBLIVEEXEC,(PPDMUSBINS pUsbIns, PSSMHANDLE pSSM, uint32_t uPass));
+/** Pointer to a FNSSMUSBLIVEEXEC() function. */
+typedef FNSSMUSBLIVEEXEC *PFNSSMUSBLIVEEXEC;
+
+/**
+ * Vote on whether the live part of the saving has been concluded.
+ *
+ * The vote stops once a unit has vetoed the decision, so don't rely upon this
+ * being called every time.
+ *
+ * @returns VBox status code.
+ * @retval  VINF_SUCCESS if done.
+ * @retval  VINF_SSM_VOTE_FOR_ANOTHER_PASS if another pass is needed.
+ * @retval  VINF_SSM_VOTE_DONE_DONT_CALL_AGAIN if the live saving of the unit is
+ *          done and there is not need calling it again before the final pass.
+ * @retval  VERR_SSM_VOTE_FOR_GIVING_UP if its time to give up.
+ *
+ * @param   pUsbIns         The USB device instance of the USB device which
+ *                          registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @param   uPass           The data pass.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMUSBLIVEVOTE,(PPDMUSBINS pUsbIns, PSSMHANDLE pSSM, uint32_t uPass));
+/** Pointer to a FNSSMUSBLIVEVOTE() function. */
+typedef FNSSMUSBLIVEVOTE *PFNSSMUSBLIVEVOTE;
+
+/**
+ * Prepare state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pUsbIns         The USB device instance of the USB device which
+ *                          registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMUSBSAVEPREP,(PPDMUSBINS pUsbIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMUSBSAVEPREP() function. */
+typedef FNSSMUSBSAVEPREP *PFNSSMUSBSAVEPREP;
+
+/**
+ * Execute state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pUsbIns         The USB device instance of the USB device which
+ *                          registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMUSBSAVEEXEC,(PPDMUSBINS pUsbIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMUSBSAVEEXEC() function. */
+typedef FNSSMUSBSAVEEXEC *PFNSSMUSBSAVEEXEC;
+
+/**
+ * Done state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pUsbIns         The USB device instance of the USB device which
+ *                          registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMUSBSAVEDONE,(PPDMUSBINS pUsbIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMUSBSAVEDONE() function. */
+typedef FNSSMUSBSAVEDONE *PFNSSMUSBSAVEDONE;
+
+/**
+ * Prepare state load operation.
+ *
+ * @returns VBox status code.
+ * @param   pUsbIns         The USB device instance of the USB device which
+ *                          registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMUSBLOADPREP,(PPDMUSBINS pUsbIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMUSBLOADPREP() function. */
+typedef FNSSMUSBLOADPREP *PFNSSMUSBLOADPREP;
+
+/**
+ * Execute state load operation.
+ *
+ * @returns VBox status code.
+ * @param   pUsbIns         The USB device instance of the USB device which
+ *                          registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @param   uVersion        Data layout version.
+ * @param   uPass           The pass. This is always SSM_PASS_FINAL for units
+ *                          that doesn't specify a pfnSaveLive callback.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMUSBLOADEXEC,(PPDMUSBINS pUsbIns, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass));
+/** Pointer to a FNSSMUSBLOADEXEC() function. */
+typedef FNSSMUSBLOADEXEC *PFNSSMUSBLOADEXEC;
+
+/**
+ * Done state load operation.
+ *
+ * @returns VBox load code.
+ * @param   pUsbIns         The USB device instance of the USB device which
+ *                          registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMUSBLOADDONE,(PPDMUSBINS pUsbIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMUSBLOADDONE() function. */
+typedef FNSSMUSBLOADDONE *PFNSSMUSBLOADDONE;
+
+/** @} */
+
+
+/** The PDM Driver callback variants.
+ * @{
+ */
+
+/**
+ * Prepare state live save operation.
+ *
+ * @returns VBox status code.
+ * @param   pDrvIns         Driver instance of the driver which registered the
+ *                          data unit.
+ * @param   pSSM            SSM operation handle.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDRVLIVEPREP,(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMDRVLIVEPREP() function. */
+typedef FNSSMDRVLIVEPREP *PFNSSMDRVLIVEPREP;
+
+/**
+ * Execute state live save operation.
+ *
+ * This will be called repeatedly until all units vote that the live phase has
+ * been concluded.
+ *
+ * @returns VBox status code.
+ * @param   pDrvIns         Driver instance of the driver which registered the
+ *                          data unit.
+ * @param   pSSM            SSM operation handle.
+ * @param   uPass           The data pass.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDRVLIVEEXEC,(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM, uint32_t uPass));
+/** Pointer to a FNSSMDRVLIVEEXEC() function. */
+typedef FNSSMDRVLIVEEXEC *PFNSSMDRVLIVEEXEC;
+
+/**
+ * Vote on whether the live part of the saving has been concluded.
+ *
+ * The vote stops once a unit has vetoed the decision, so don't rely upon this
+ * being called every time.
+ *
+ * @returns VBox status code.
+ * @retval  VINF_SUCCESS if done.
+ * @retval  VINF_SSM_VOTE_FOR_ANOTHER_PASS if another pass is needed.
+ * @retval  VINF_SSM_VOTE_DONE_DONT_CALL_AGAIN if the live saving of the unit is
+ *          done and there is not need calling it again before the final pass.
+ * @retval  VERR_SSM_VOTE_FOR_GIVING_UP if its time to give up.
+ *
+ * @param   pDrvIns         Driver instance of the driver which registered the
+ *                          data unit.
+ * @param   pSSM            SSM operation handle.
+ * @param   uPass           The data pass.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDRVLIVEVOTE,(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM, uint32_t uPass));
+/** Pointer to a FNSSMDRVLIVEVOTE() function. */
+typedef FNSSMDRVLIVEVOTE *PFNSSMDRVLIVEVOTE;
+
+
+/**
+ * Prepare state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pDrvIns         Driver instance of the driver which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDRVSAVEPREP,(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMDRVSAVEPREP() function. */
+typedef FNSSMDRVSAVEPREP *PFNSSMDRVSAVEPREP;
+
+/**
+ * Execute state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pDrvIns         Driver instance of the driver which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDRVSAVEEXEC,(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMDRVSAVEEXEC() function. */
+typedef FNSSMDRVSAVEEXEC *PFNSSMDRVSAVEEXEC;
+
+/**
+ * Done state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pDrvIns         Driver instance of the driver which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDRVSAVEDONE,(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMDRVSAVEDONE() function. */
+typedef FNSSMDRVSAVEDONE *PFNSSMDRVSAVEDONE;
+
+/**
+ * Prepare state load operation.
+ *
+ * @returns VBox status code.
+ * @param   pDrvIns         Driver instance of the driver which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDRVLOADPREP,(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMDRVLOADPREP() function. */
+typedef FNSSMDRVLOADPREP *PFNSSMDRVLOADPREP;
+
+/**
+ * Execute state load operation.
+ *
+ * @returns VBox status code.
+ * @param   pDrvIns         Driver instance of the driver which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ * @param   uVersion        Data layout version.
+ * @param   uPass           The pass. This is always SSM_PASS_FINAL for units
+ *                          that doesn't specify a pfnSaveLive callback.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDRVLOADEXEC,(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass));
+/** Pointer to a FNSSMDRVLOADEXEC() function. */
+typedef FNSSMDRVLOADEXEC *PFNSSMDRVLOADEXEC;
+
+/**
+ * Done state load operation.
+ *
+ * @returns VBox load code.
+ * @param   pDrvIns         Driver instance of the driver which registered the data unit.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMDRVLOADDONE,(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMDRVLOADDONE() function. */
+typedef FNSSMDRVLOADDONE *PFNSSMDRVLOADDONE;
+
+/** @} */
+
+
+/** The internal callback variants.
+ * @{
+ */
+
+
+/**
+ * Prepare state live save operation.
+ *
+ * @returns VBox status code.
+ * @param   pVM             The cross context VM structure.
+ * @param   pSSM            SSM operation handle.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMINTLIVEPREP,(PVM pVM, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMINTLIVEPREP() function. */
+typedef FNSSMINTLIVEPREP *PFNSSMINTLIVEPREP;
+
+/**
+ * Execute state live save operation.
+ *
+ * This will be called repeatedly until all units vote that the live phase has
+ * been concluded.
+ *
+ * @returns VBox status code.
+ * @param   pVM             The cross context VM structure.
+ * @param   pSSM            SSM operation handle.
+ * @param   uPass           The data pass.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMINTLIVEEXEC,(PVM pVM, PSSMHANDLE pSSM, uint32_t uPass));
+/** Pointer to a FNSSMINTLIVEEXEC() function. */
+typedef FNSSMINTLIVEEXEC *PFNSSMINTLIVEEXEC;
+
+/**
+ * Vote on whether the live part of the saving has been concluded.
+ *
+ * The vote stops once a unit has vetoed the decision, so don't rely upon this
+ * being called every time.
+ *
+ * @returns VBox status code.
+ * @retval  VINF_SUCCESS if done.
+ * @retval  VINF_SSM_VOTE_FOR_ANOTHER_PASS if another pass is needed.
+ * @retval  VINF_SSM_VOTE_DONE_DONT_CALL_AGAIN if the live saving of the unit is
+ *          done and there is not need calling it again before the final pass.
+ * @retval  VERR_SSM_VOTE_FOR_GIVING_UP if its time to give up.
+ *
+ * @param   pVM             The cross context VM structure.
+ * @param   pSSM            SSM operation handle.
+ * @param   uPass           The data pass.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMINTLIVEVOTE,(PVM pVM, PSSMHANDLE pSSM, uint32_t uPass));
+/** Pointer to a FNSSMINTLIVEVOTE() function. */
+typedef FNSSMINTLIVEVOTE *PFNSSMINTLIVEVOTE;
+
+/**
+ * Prepare state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pVM             The cross context VM structure.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMINTSAVEPREP,(PVM pVM, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMINTSAVEPREP() function. */
+typedef FNSSMINTSAVEPREP *PFNSSMINTSAVEPREP;
+
+/**
+ * Execute state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pVM             The cross context VM structure.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMINTSAVEEXEC,(PVM pVM, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMINTSAVEEXEC() function. */
+typedef FNSSMINTSAVEEXEC *PFNSSMINTSAVEEXEC;
+
+/**
+ * Done state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pVM             The cross context VM structure.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMINTSAVEDONE,(PVM pVM, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMINTSAVEDONE() function. */
+typedef FNSSMINTSAVEDONE *PFNSSMINTSAVEDONE;
+
+/**
+ * Prepare state load operation.
+ *
+ * @returns VBox status code.
+ * @param   pVM             The cross context VM structure.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMINTLOADPREP,(PVM pVM, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMINTLOADPREP() function. */
+typedef FNSSMINTLOADPREP *PFNSSMINTLOADPREP;
+
+/**
+ * Execute state load operation.
+ *
+ * @returns VBox status code.
+ * @param   pVM             The cross context VM structure.
+ * @param   pSSM            SSM operation handle.
+ * @param   uVersion        Data layout version.
+ * @param   uPass           The pass. This is always SSM_PASS_FINAL for units
+ *                          that doesn't specify a pfnSaveLive callback.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMINTLOADEXEC,(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass));
+/** Pointer to a FNSSMINTLOADEXEC() function. */
+typedef FNSSMINTLOADEXEC *PFNSSMINTLOADEXEC;
+
+/**
+ * Done state load operation.
+ *
+ * @returns VBox load code.
+ * @param   pVM             The cross context VM structure.
+ * @param   pSSM            SSM operation handle.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMINTLOADDONE,(PVM pVM, PSSMHANDLE pSSM));
+/** Pointer to a FNSSMINTLOADDONE() function. */
+typedef FNSSMINTLOADDONE *PFNSSMINTLOADDONE;
+
+/** @} */
+
+
+/** The External callback variants.
+ * @{
+ */
+
+/**
+ * Prepare state live save operation.
+ *
+ * @returns VBox status code.
+ * @param   pSSM            SSM operation handle.
+ * @param   pVMM            The VMM ring-3 vtable.
+ * @param   pvUser          User argument.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMEXTLIVEPREP,(PSSMHANDLE pSSM, PCVMMR3VTABLE pVMM, void *pvUser));
+/** Pointer to a FNSSMEXTLIVEPREP() function. */
+typedef FNSSMEXTLIVEPREP *PFNSSMEXTLIVEPREP;
+
+/**
+ * Execute state live save operation.
+ *
+ * This will be called repeatedly until all units vote that the live phase has
+ * been concluded.
+ *
+ * @returns VBox status code.
+ * @param   pSSM            SSM operation handle.
+ * @param   pVMM            The VMM ring-3 vtable.
+ * @param   pvUser          User argument.
+ * @param   uPass           The data pass.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMEXTLIVEEXEC,(PSSMHANDLE pSSM, PCVMMR3VTABLE pVMM, void *pvUser, uint32_t uPass));
+/** Pointer to a FNSSMEXTLIVEEXEC() function. */
+typedef FNSSMEXTLIVEEXEC *PFNSSMEXTLIVEEXEC;
+
+/**
+ * Vote on whether the live part of the saving has been concluded.
+ *
+ * The vote stops once a unit has vetoed the decision, so don't rely upon this
+ * being called every time.
+ *
+ * @returns VBox status code.
+ * @retval  VINF_SUCCESS if done.
+ * @retval  VINF_SSM_VOTE_FOR_ANOTHER_PASS if another pass is needed.
+ * @retval  VINF_SSM_VOTE_DONE_DONT_CALL_AGAIN if the live saving of the unit is
+ *          done and there is not need calling it again before the final pass.
+ * @retval  VERR_SSM_VOTE_FOR_GIVING_UP if its time to give up.
+ *
+ * @param   pSSM            SSM operation handle.
+ * @param   pVMM            The VMM ring-3 vtable.
+ * @param   pvUser          User argument.
+ * @param   uPass           The data pass.
+ * @thread  Any.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMEXTLIVEVOTE,(PSSMHANDLE pSSM, PCVMMR3VTABLE pVMM, void *pvUser, uint32_t uPass));
+/** Pointer to a FNSSMEXTLIVEVOTE() function. */
+typedef FNSSMEXTLIVEVOTE *PFNSSMEXTLIVEVOTE;
+
+/**
+ * Prepare state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pSSM            SSM operation handle.
+ * @param   pVMM            The VMM ring-3 vtable.
+ * @param   pvUser          User argument.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMEXTSAVEPREP,(PSSMHANDLE pSSM, PCVMMR3VTABLE pVMM, void *pvUser));
+/** Pointer to a FNSSMEXTSAVEPREP() function. */
+typedef FNSSMEXTSAVEPREP *PFNSSMEXTSAVEPREP;
+
+/**
+ * Execute state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pSSM            SSM operation handle.
+ * @param   pVMM            The VMM ring-3 vtable.
+ * @param   pvUser          User argument.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMEXTSAVEEXEC,(PSSMHANDLE pSSM, PCVMMR3VTABLE pVMM, void *pvUser));
+/** Pointer to a FNSSMEXTSAVEEXEC() function. */
+typedef FNSSMEXTSAVEEXEC *PFNSSMEXTSAVEEXEC;
+
+/**
+ * Done state save operation.
+ *
+ * @returns VBox status code.
+ * @param   pSSM            SSM operation handle.
+ * @param   pVMM            The VMM ring-3 vtable.
+ * @param   pvUser          User argument.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMEXTSAVEDONE,(PSSMHANDLE pSSM, PCVMMR3VTABLE pVMM, void *pvUser));
+/** Pointer to a FNSSMEXTSAVEDONE() function. */
+typedef FNSSMEXTSAVEDONE *PFNSSMEXTSAVEDONE;
+
+/**
+ * Prepare state load operation.
+ *
+ * @returns VBox status code.
+ * @param   pSSM            SSM operation handle.
+ * @param   pVMM            The VMM ring-3 vtable.
+ * @param   pvUser          User argument.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMEXTLOADPREP,(PSSMHANDLE pSSM, PCVMMR3VTABLE pVMM, void *pvUser));
+/** Pointer to a FNSSMEXTLOADPREP() function. */
+typedef FNSSMEXTLOADPREP *PFNSSMEXTLOADPREP;
+
+/**
+ * Execute state load operation.
+ *
+ * @returns VBox status code.
+ * @param   pSSM            SSM operation handle.
+ * @param   pVMM            The VMM ring-3 vtable.
+ * @param   pvUser          User argument.
+ * @param   uVersion        Data layout version.
+ * @param   uPass           The pass. This is always SSM_PASS_FINAL for units
+ *                          that doesn't specify a pfnSaveLive callback.
+ * @remark  The odd return value is for legacy reasons.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMEXTLOADEXEC,(PSSMHANDLE pSSM, PCVMMR3VTABLE pVMM, void *pvUser,
+                                                uint32_t uVersion, uint32_t uPass));
+/** Pointer to a FNSSMEXTLOADEXEC() function. */
+typedef FNSSMEXTLOADEXEC *PFNSSMEXTLOADEXEC;
+
+/**
+ * Done state load operation.
+ *
+ * @returns VBox load code.
+ * @param   pSSM            SSM operation handle.
+ * @param   pVMM            The VMM ring-3 vtable.
+ * @param   pvUser          User argument.
+ */
+typedef DECLCALLBACKTYPE(int, FNSSMEXTLOADDONE,(PSSMHANDLE pSSM, PCVMMR3VTABLE pVMM, void *pvUser));
+/** Pointer to a FNSSMEXTLOADDONE() function. */
+typedef FNSSMEXTLOADDONE *PFNSSMEXTLOADDONE;
+
+/** @} */
+
+
+/**
+ * SSM stream method table.
+ *
+ * This is used by external parties for teleporting over TCP or any other media.
+ * SSM also uses this internally for file access, thus the 2-3 file centric
+ * methods.
+ */
+typedef struct SSMSTRMOPS
+{
+    /** Struct magic + version (SSMSTRMOPS_VERSION). */
+    uint32_t    u32Version;
+
+    /**
+     * Write bytes to the stream.
+     *
+     * @returns VBox status code.
+     * @param   pvUser              The user argument.
+     * @param   offStream           The stream offset we're (supposed to be) at.
+     * @param   pvBuf               Pointer to the data.
+     * @param   cbToWrite           The number of bytes to write.
+     */
+    DECLCALLBACKMEMBER(int, pfnWrite,(void *pvUser, uint64_t offStream, const void *pvBuf, size_t cbToWrite));
+
+    /**
+     * Read bytes to the stream.
+     *
+     * @returns VBox status code.
+     * @param   pvUser              The user argument.
+     * @param   offStream           The stream offset we're (supposed to be) at.
+     * @param   pvBuf               Where to return the bytes.
+     * @param   cbToRead            The number of bytes to read.
+     * @param   pcbRead             Where to return the number of bytes actually
+     *                              read.  This may differ from cbToRead when the
+     *                              end of the stream is encountered.
+     */
+    DECLCALLBACKMEMBER(int, pfnRead,(void *pvUser, uint64_t offStream, void *pvBuf, size_t cbToRead, size_t *pcbRead));
+
+    /**
+     * Seeks in the stream.
+     *
+     * @returns VBox status code.
+     * @retval  VERR_NOT_SUPPORTED if the stream doesn't support this action.
+     *
+     * @param   pvUser              The user argument.
+     * @param   offSeek             The seek offset.
+     * @param   uMethod             RTFILE_SEEK_BEGIN, RTFILE_SEEK_END or
+     *                              RTFILE_SEEK_CURRENT.
+     * @param   poffActual          Where to store the new file position. Optional.
+     */
+    DECLCALLBACKMEMBER(int, pfnSeek,(void *pvUser, int64_t offSeek, unsigned uMethod, uint64_t *poffActual));
+
+    /**
+     * Get the current stream position.
+     *
+     * @returns The correct stream position.
+     * @param   pvUser              The user argument.
+     */
+    DECLCALLBACKMEMBER(uint64_t, pfnTell,(void *pvUser));
+
+    /**
+     * Get the size/length of the stream.
+     *
+     * @returns VBox status code.
+     * @retval  VERR_NOT_SUPPORTED if the stream doesn't support this action.
+     *
+     * @param   pvUser              The user argument.
+     * @param   pcb                 Where to return the size/length.
+     */
+    DECLCALLBACKMEMBER(int, pfnSize,(void *pvUser, uint64_t *pcb));
+
+    /**
+     * Check if the stream is OK or not (cancelled).
+     *
+     * @returns VBox status code.
+     * @param   pvUser              The user argument.
+     *
+     * @remarks The method is expected to do a LogRel on failure.
+     */
+    DECLCALLBACKMEMBER(int, pfnIsOk,(void *pvUser));
+
+    /**
+     * Close the stream.
+     *
+     * @returns VBox status code.
+     * @param   pvUser              The user argument.
+     * @param   fCancelled          True if the operation was cancelled.
+     */
+    DECLCALLBACKMEMBER(int, pfnClose,(void *pvUser, bool fCancelled));
+
+    /** Struct magic + version (SSMSTRMOPS_VERSION). */
+    uint32_t    u32EndVersion;
+} SSMSTRMOPS;
+/** Struct magic + version (SSMSTRMOPS_VERSION). */
+#define SSMSTRMOPS_VERSION      UINT32_C(0x55aa0001)
+
+
+VMMR3DECL(void)         SSMR3Term(PVM pVM);
+VMMR3_INT_DECL(int)
+SSMR3RegisterDevice(PVM pVM, PPDMDEVINS pDevIns, const char *pszName, uint32_t uInstance, uint32_t uVersion,
+                    size_t cbGuess, const char *pszBefore,
+                    PFNSSMDEVLIVEPREP pfnLivePrep, PFNSSMDEVLIVEEXEC pfnLiveExec, PFNSSMDEVLIVEVOTE pfnLiveVote,
+                    PFNSSMDEVSAVEPREP pfnSavePrep, PFNSSMDEVSAVEEXEC pfnSaveExec, PFNSSMDEVSAVEDONE pfnSaveDone,
+                    PFNSSMDEVLOADPREP pfnLoadPrep, PFNSSMDEVLOADEXEC pfnLoadExec, PFNSSMDEVLOADDONE pfnLoadDone);
+VMMR3_INT_DECL(int)
+SSMR3RegisterDriver(PVM pVM, PPDMDRVINS pDrvIns, const char *pszName, uint32_t uInstance, uint32_t uVersion, size_t cbGuess,
+                    PFNSSMDRVLIVEPREP pfnLivePrep, PFNSSMDRVLIVEEXEC pfnLiveExec, PFNSSMDRVLIVEVOTE pfnLiveVote,
+                    PFNSSMDRVSAVEPREP pfnSavePrep, PFNSSMDRVSAVEEXEC pfnSaveExec, PFNSSMDRVSAVEDONE pfnSaveDone,
+                    PFNSSMDRVLOADPREP pfnLoadPrep, PFNSSMDRVLOADEXEC pfnLoadExec, PFNSSMDRVLOADDONE pfnLoadDone);
+VMMR3_INT_DECL(int)
+SSMR3RegisterUsb(PVM pVM, PPDMUSBINS pUsbIns, const char *pszName, uint32_t uInstance, uint32_t uVersion, size_t cbGuess,
+                 PFNSSMUSBLIVEPREP pfnLivePrep, PFNSSMUSBLIVEEXEC pfnLiveExec, PFNSSMUSBLIVEVOTE pfnLiveVote,
+                 PFNSSMUSBSAVEPREP pfnSavePrep, PFNSSMUSBSAVEEXEC pfnSaveExec, PFNSSMUSBSAVEDONE pfnSaveDone,
+                 PFNSSMUSBLOADPREP pfnLoadPrep, PFNSSMUSBLOADEXEC pfnLoadExec, PFNSSMUSBLOADDONE pfnLoadDone);
+VMMR3DECL(int)
+SSMR3RegisterInternal(PVM pVM, const char *pszName, uint32_t uInstance, uint32_t uVersion, size_t cbGuess,
+                      PFNSSMINTLIVEPREP pfnLivePrep, PFNSSMINTLIVEEXEC pfnLiveExec, PFNSSMINTLIVEVOTE pfnLiveVote,
+                      PFNSSMINTSAVEPREP pfnSavePrep, PFNSSMINTSAVEEXEC pfnSaveExec, PFNSSMINTSAVEDONE pfnSaveDone,
+                      PFNSSMINTLOADPREP pfnLoadPrep, PFNSSMINTLOADEXEC pfnLoadExec, PFNSSMINTLOADDONE pfnLoadDone);
+VMMR3DECL(int)
+SSMR3RegisterExternal(PUVM pUVM, const char *pszName, uint32_t uInstance, uint32_t uVersion, size_t cbGuess,
+                      PFNSSMEXTLIVEPREP pfnLivePrep, PFNSSMEXTLIVEEXEC pfnLiveExec, PFNSSMEXTLIVEVOTE pfnLiveVote,
+                      PFNSSMEXTSAVEPREP pfnSavePrep, PFNSSMEXTSAVEEXEC pfnSaveExec, PFNSSMEXTSAVEDONE pfnSaveDone,
+                      PFNSSMEXTLOADPREP pfnLoadPrep, PFNSSMEXTLOADEXEC pfnLoadExec, PFNSSMEXTLOADDONE pfnLoadDone, void *pvUser);
+VMMR3DECL(int)          SSMR3RegisterStub(PVM pVM, const char *pszName, uint32_t uInstance);
+VMMR3_INT_DECL(int)     SSMR3DeregisterDevice(PVM pVM, PPDMDEVINS pDevIns, const char *pszName, uint32_t uInstance);
+VMMR3_INT_DECL(int)     SSMR3DeregisterDriver(PVM pVM, PPDMDRVINS pDrvIns, const char *pszName, uint32_t uInstance);
+VMMR3_INT_DECL(int)     SSMR3DeregisterUsb(PVM pVM, PPDMUSBINS pUsbIns, const char *pszName, uint32_t uInstance);
+VMMR3DECL(int)          SSMR3DeregisterInternal(PVM pVM, const char *pszName);
+VMMR3DECL(int)          SSMR3DeregisterExternal(PUVM pUVM, const char *pszName);
+VMMR3DECL(int)          SSMR3Save(PVM pVM, const char *pszFilename, PCSSMSTRMOPS pStreamOps, void *pvStreamOpsUser, SSMAFTER enmAfter, PFNVMPROGRESS pfnProgress, void *pvUser);
+VMMR3_INT_DECL(int)     SSMR3LiveSave(PVM pVM, uint32_t cMsMaxDowntime,
+                                      const char *pszFilename, PCSSMSTRMOPS pStreamOps, void *pvStreamOps,
+                                      SSMAFTER enmAfter, PFNVMPROGRESS pfnProgress, void *pvProgressUser,
+                                      PSSMHANDLE *ppSSM);
+VMMR3_INT_DECL(int)     SSMR3LiveDoStep1(PSSMHANDLE pSSM);
+VMMR3_INT_DECL(int)     SSMR3LiveDoStep2(PSSMHANDLE pSSM);
+VMMR3_INT_DECL(int)     SSMR3LiveDone(PSSMHANDLE pSSM);
+VMMR3DECL(int)          SSMR3Load(PVM pVM, const char *pszFilename, PCSSMSTRMOPS pStreamOps, void *pvStreamOpsUser,
+                                  SSMAFTER enmAfter, PFNVMPROGRESS pfnProgress, void *pvProgressUser);
+VMMR3DECL(int)          SSMR3ValidateFile(const char *pszFilename, PCSSMSTRMOPS pStreamOps, void *pvStreamOps,
+                                          bool fChecksumIt);
+VMMR3DECL(int)          SSMR3Open(const char *pszFilename, PCSSMSTRMOPS pStreamOps, void *pvStreamOps,
+                                  unsigned fFlags, PSSMHANDLE *ppSSM);
+VMMR3DECL(int)          SSMR3Close(PSSMHANDLE pSSM);
+VMMR3DECL(int)          SSMR3Seek(PSSMHANDLE pSSM, const char *pszUnit, uint32_t iInstance, uint32_t *piVersion);
+VMMR3DECL(int)          SSMR3HandleGetStatus(PSSMHANDLE pSSM);
+VMMR3DECL(int)          SSMR3HandleSetStatus(PSSMHANDLE pSSM, int iStatus);
+VMMR3DECL(SSMAFTER)     SSMR3HandleGetAfter(PSSMHANDLE pSSM);
+VMMR3DECL(bool)         SSMR3HandleIsLiveSave(PSSMHANDLE pSSM);
+VMMR3DECL(uint32_t)     SSMR3HandleMaxDowntime(PSSMHANDLE pSSM);
+VMMR3DECL(uint32_t)     SSMR3HandleHostBits(PSSMHANDLE pSSM);
+VMMR3DECL(uint32_t)     SSMR3HandleRevision(PSSMHANDLE pSSM);
+VMMR3DECL(uint32_t)     SSMR3HandleVersion(PSSMHANDLE pSSM);
+VMMR3DECL(const char *) SSMR3HandleHostOSAndArch(PSSMHANDLE pSSM);
+VMMR3_INT_DECL(int)     SSMR3HandleSetGCPtrSize(PSSMHANDLE pSSM, unsigned cbGCPtr);
+VMMR3DECL(void)         SSMR3HandleReportLivePercent(PSSMHANDLE pSSM, unsigned uPercent);
+#ifdef DEBUG
+VMMR3DECL(uint64_t)     SSMR3HandleTellInUnit(PSSMHANDLE pSSM);
+#endif
+VMMR3DECL(int)          SSMR3Cancel(PUVM pUVM);
+
+
+/** Save operations.
+ * @{
+ */
+VMMR3DECL(int) SSMR3PutStruct(PSSMHANDLE pSSM, const void *pvStruct, PCSSMFIELD paFields);
+VMMR3DECL(int) SSMR3PutStructEx(PSSMHANDLE pSSM, const void *pvStruct, size_t cbStruct, uint32_t fFlags, PCSSMFIELD paFields, void *pvUser);
+VMMR3DECL(int) SSMR3PutBool(PSSMHANDLE pSSM, bool fBool);
+VMMR3DECL(int) SSMR3PutU8(PSSMHANDLE pSSM, uint8_t u8);
+VMMR3DECL(int) SSMR3PutS8(PSSMHANDLE pSSM, int8_t i8);
+VMMR3DECL(int) SSMR3PutU16(PSSMHANDLE pSSM, uint16_t u16);
+VMMR3DECL(int) SSMR3PutS16(PSSMHANDLE pSSM, int16_t i16);
+VMMR3DECL(int) SSMR3PutU32(PSSMHANDLE pSSM, uint32_t u32);
+VMMR3DECL(int) SSMR3PutS32(PSSMHANDLE pSSM, int32_t i32);
+VMMR3DECL(int) SSMR3PutU64(PSSMHANDLE pSSM, uint64_t u64);
+VMMR3DECL(int) SSMR3PutS64(PSSMHANDLE pSSM, int64_t i64);
+VMMR3DECL(int) SSMR3PutU128(PSSMHANDLE pSSM, uint128_t u128);
+VMMR3DECL(int) SSMR3PutS128(PSSMHANDLE pSSM, int128_t i128);
+VMMR3DECL(int) SSMR3PutUInt(PSSMHANDLE pSSM, RTUINT u);
+VMMR3DECL(int) SSMR3PutSInt(PSSMHANDLE pSSM, RTINT i);
+VMMR3DECL(int) SSMR3PutGCUInt(PSSMHANDLE pSSM, RTGCUINT u);
+VMMR3DECL(int) SSMR3PutGCUIntReg(PSSMHANDLE pSSM, RTGCUINTREG u);
+VMMR3DECL(int) SSMR3PutGCPhys32(PSSMHANDLE pSSM, RTGCPHYS32 GCPhys);
+VMMR3DECL(int) SSMR3PutGCPhys64(PSSMHANDLE pSSM, RTGCPHYS64 GCPhys);
+VMMR3DECL(int) SSMR3PutGCPhys(PSSMHANDLE pSSM, RTGCPHYS GCPhys);
+VMMR3DECL(int) SSMR3PutGCPtr(PSSMHANDLE pSSM, RTGCPTR GCPtr);
+VMMR3DECL(int) SSMR3PutGCUIntPtr(PSSMHANDLE pSSM, RTGCUINTPTR GCPtr);
+VMMR3DECL(int) SSMR3PutRCPtr(PSSMHANDLE pSSM, RTRCPTR RCPtr);
+VMMR3DECL(int) SSMR3PutIOPort(PSSMHANDLE pSSM, RTIOPORT IOPort);
+VMMR3DECL(int) SSMR3PutSel(PSSMHANDLE pSSM, RTSEL Sel);
+VMMR3DECL(int) SSMR3PutMem(PSSMHANDLE pSSM, const void *pv, size_t cb);
+VMMR3DECL(int) SSMR3PutStrZ(PSSMHANDLE pSSM, const char *psz);
+/** @} */
+
+
+
+/** Load operations.
+ * @{
+ */
+VMMR3DECL(int) SSMR3GetStruct(PSSMHANDLE pSSM, void *pvStruct, PCSSMFIELD paFields);
+VMMR3DECL(int) SSMR3GetStructEx(PSSMHANDLE pSSM, void *pvStruct, size_t cbStruct, uint32_t fFlags, PCSSMFIELD paFields, void *pvUser);
+VMMR3DECL(int) SSMR3GetBool(PSSMHANDLE pSSM, bool *pfBool);
+VMMR3DECL(int) SSMR3GetBoolV(PSSMHANDLE pSSM, bool volatile *pfBool);
+VMMR3DECL(int) SSMR3GetU8(PSSMHANDLE pSSM, uint8_t *pu8);
+VMMR3DECL(int) SSMR3GetU8V(PSSMHANDLE pSSM, uint8_t volatile *pu8);
+VMMR3DECL(int) SSMR3GetS8(PSSMHANDLE pSSM, int8_t *pi8);
+VMMR3DECL(int) SSMR3GetS8V(PSSMHANDLE pSSM, int8_t volatile *pi8);
+VMMR3DECL(int) SSMR3GetU16(PSSMHANDLE pSSM, uint16_t *pu16);
+VMMR3DECL(int) SSMR3GetU16V(PSSMHANDLE pSSM, uint16_t volatile *pu16);
+VMMR3DECL(int) SSMR3GetS16(PSSMHANDLE pSSM, int16_t *pi16);
+VMMR3DECL(int) SSMR3GetS16V(PSSMHANDLE pSSM, int16_t volatile *pi16);
+VMMR3DECL(int) SSMR3GetU32(PSSMHANDLE pSSM, uint32_t *pu32);
+VMMR3DECL(int) SSMR3GetU32V(PSSMHANDLE pSSM, uint32_t volatile *pu32);
+VMMR3DECL(int) SSMR3GetS32(PSSMHANDLE pSSM, int32_t *pi32);
+VMMR3DECL(int) SSMR3GetS32V(PSSMHANDLE pSSM, int32_t volatile *pi32);
+VMMR3DECL(int) SSMR3GetU64(PSSMHANDLE pSSM, uint64_t *pu64);
+VMMR3DECL(int) SSMR3GetU64V(PSSMHANDLE pSSM, uint64_t volatile *pu64);
+VMMR3DECL(int) SSMR3GetS64(PSSMHANDLE pSSM, int64_t *pi64);
+VMMR3DECL(int) SSMR3GetS64V(PSSMHANDLE pSSM, int64_t volatile *pi64);
+VMMR3DECL(int) SSMR3GetU128(PSSMHANDLE pSSM, uint128_t *pu128);
+VMMR3DECL(int) SSMR3GetU128V(PSSMHANDLE pSSM, uint128_t volatile *pu128);
+VMMR3DECL(int) SSMR3GetS128(PSSMHANDLE pSSM, int128_t *pi128);
+VMMR3DECL(int) SSMR3GetS128V(PSSMHANDLE pSSM, int128_t volatile *pi128);
+VMMR3DECL(int) SSMR3GetGCPhys32(PSSMHANDLE pSSM, PRTGCPHYS32 pGCPhys);
+VMMR3DECL(int) SSMR3GetGCPhys32V(PSSMHANDLE pSSM, RTGCPHYS32 volatile *pGCPhys);
+VMMR3DECL(int) SSMR3GetGCPhys64(PSSMHANDLE pSSM, PRTGCPHYS64 pGCPhys);
+VMMR3DECL(int) SSMR3GetGCPhys64V(PSSMHANDLE pSSM, RTGCPHYS64 volatile *pGCPhys);
+VMMR3DECL(int) SSMR3GetGCPhys(PSSMHANDLE pSSM, PRTGCPHYS pGCPhys);
+VMMR3DECL(int) SSMR3GetGCPhysV(PSSMHANDLE pSSM, RTGCPHYS volatile *pGCPhys);
+VMMR3DECL(int) SSMR3GetUInt(PSSMHANDLE pSSM, PRTUINT pu);
+VMMR3DECL(int) SSMR3GetSInt(PSSMHANDLE pSSM, PRTINT pi);
+VMMR3DECL(int) SSMR3GetGCUInt(PSSMHANDLE pSSM, PRTGCUINT pu);
+VMMR3DECL(int) SSMR3GetGCUIntReg(PSSMHANDLE pSSM, PRTGCUINTREG pu);
+VMMR3DECL(int) SSMR3GetGCPtr(PSSMHANDLE pSSM, PRTGCPTR pGCPtr);
+VMMR3DECL(int) SSMR3GetGCUIntPtr(PSSMHANDLE pSSM, PRTGCUINTPTR pGCPtr);
+VMMR3DECL(int) SSMR3GetRCPtr(PSSMHANDLE pSSM, PRTRCPTR pRCPtr);
+VMMR3DECL(int) SSMR3GetIOPort(PSSMHANDLE pSSM, PRTIOPORT pIOPort);
+VMMR3DECL(int) SSMR3GetSel(PSSMHANDLE pSSM, PRTSEL pSel);
+VMMR3DECL(int) SSMR3GetMem(PSSMHANDLE pSSM, void *pv, size_t cb);
+VMMR3DECL(int) SSMR3GetStrZ(PSSMHANDLE pSSM, char *psz, size_t cbMax);
+VMMR3DECL(int) SSMR3GetStrZEx(PSSMHANDLE pSSM, char *psz, size_t cbMax, size_t *pcbStr);
+VMMR3DECL(int) SSMR3Skip(PSSMHANDLE pSSM, size_t cb);
+VMMR3DECL(int) SSMR3SkipToEndOfUnit(PSSMHANDLE pSSM);
+VMMR3DECL(int) SSMR3SetLoadError(PSSMHANDLE pSSM, int rc, RT_SRC_POS_DECL, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(6, 7);
+VMMR3DECL(int) SSMR3SetLoadErrorV(PSSMHANDLE pSSM, int rc, RT_SRC_POS_DECL, const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(6, 0);
+VMMR3DECL(int) SSMR3SetCfgError(PSSMHANDLE pSSM, RT_SRC_POS_DECL, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(5, 6);
+VMMR3DECL(int) SSMR3SetCfgErrorV(PSSMHANDLE pSSM, RT_SRC_POS_DECL, const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(5, 0);
+
+/** Wrapper around SSMR3GetU32 for simplifying getting enum values saved as uint32_t. */
+# define SSM_GET_ENUM32_RET(a_pSSM, a_enmDst, a_EnumType) \
+    do { \
+        uint32_t u32GetEnumTmp = 0; \
+        int rcGetEnum32Tmp = SSMR3GetU32((a_pSSM), &u32GetEnumTmp); \
+        AssertRCReturn(rcGetEnum32Tmp, rcGetEnum32Tmp); \
+        (a_enmDst) = (a_EnumType)u32GetEnumTmp; \
+        AssertCompile(sizeof(a_EnumType) == sizeof(u32GetEnumTmp)); \
+    } while (0)
+
+/** @} */
+
+/** @} */
+#endif /* IN_RING3 */
+
+
+/** @} */
+
+RT_C_DECLS_END
+
+#endif /* !VBOX_INCLUDED_vmm_ssm_h */
+