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diff --git a/src/VBox/VMM/VMMR0/GMMR0Internal.h b/src/VBox/VMM/VMMR0/GMMR0Internal.h
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+++ b/src/VBox/VMM/VMMR0/GMMR0Internal.h
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+/* $Id: GMMR0Internal.h $ */
+/** @file
+ * GMM - The Global Memory Manager, Internal Header.
+ */
+
+/*
+ * Copyright (C) 2007-2019 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.
+ */
+
+#ifndef VMM_INCLUDED_SRC_VMMR0_GMMR0Internal_h
+#define VMM_INCLUDED_SRC_VMMR0_GMMR0Internal_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <VBox/vmm/gmm.h>
+#include <iprt/avl.h>
+
+
+/**
+ * Shared module registration info (per VM)
+ */
+typedef struct GMMSHAREDMODULEPERVM
+{
+    /** Tree node. */
+    AVLGCPTRNODECORE            Core;
+    /** Pointer to global shared module info. */
+    PGMMSHAREDMODULE            pGlobalModule;
+    /** Pointer to the region addresses.
+     *
+     * They can differe between VMs because of address space scrambling or
+     * simply different loading order. */
+    RTGCPTR64                   aRegionsGCPtrs[1];
+} GMMSHAREDMODULEPERVM;
+/** Pointer to a GMMSHAREDMODULEPERVM. */
+typedef GMMSHAREDMODULEPERVM *PGMMSHAREDMODULEPERVM;
+
+
+/** Pointer to a GMM allocation chunk. */
+typedef struct GMMCHUNK *PGMMCHUNK;
+
+
+/** The GMMCHUNK::cFree shift count employed by gmmR0SelectFreeSetList. */
+#define GMM_CHUNK_FREE_SET_SHIFT    4
+/** Index of the list containing completely unused chunks.
+ * The code ASSUMES this is the last list. */
+#define GMM_CHUNK_FREE_SET_UNUSED_LIST  (GMM_CHUNK_NUM_PAGES >> GMM_CHUNK_FREE_SET_SHIFT)
+
+/**
+ * A set of free chunks.
+ */
+typedef struct GMMCHUNKFREESET
+{
+    /** The number of free pages in the set. */
+    uint64_t            cFreePages;
+    /** The generation ID for the set.  This is incremented whenever
+     *  something is linked or unlinked from this set. */
+    uint64_t            idGeneration;
+    /** Chunks ordered by increasing number of free pages.
+     *  In the final list the chunks are completely unused. */
+    PGMMCHUNK           apLists[GMM_CHUNK_FREE_SET_UNUSED_LIST + 1];
+} GMMCHUNKFREESET;
+
+
+
+/**
+ * The per-VM GMM data.
+ */
+typedef struct GMMPERVM
+{
+    /** Free set for use in bound mode. */
+    GMMCHUNKFREESET     Private;
+    /** The VM statistics. */
+    GMMVMSTATS          Stats;
+    /** Shared module tree (per-vm). */
+    PAVLGCPTRNODECORE   pSharedModuleTree;
+    /** Hints at the last chunk we allocated some memory from. */
+    uint32_t            idLastChunkHint;
+} GMMPERVM;
+/** Pointer to the per-VM GMM data. */
+typedef GMMPERVM *PGMMPERVM;
+
+#endif /* !VMM_INCLUDED_SRC_VMMR0_GMMR0Internal_h */
+