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diff --git a/include/VBox/vmm/vmcc.h b/include/VBox/vmm/vmcc.h
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+/** @file
+ * VM - The Virtual Machine, GVM/GVMCPU or VM/VMCPU depending on context.
+ */
+
+/*
+ * Copyright (C) 2019-2022 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_vmcc_h
+#define VBOX_INCLUDED_vmm_vmcc_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+
+#include <VBox/vmm/vm.h>
+#ifdef IN_RING0
+# include <VBox/vmm/gvm.h>
+#else
+# include <VBox/vmm/uvm.h>
+#endif
+
+/** @typedef VMCC
+ * Context specific VM derived structure.
+ * This is plain VM in ring-3 and GVM (inherits from VM) in ring-0. */
+/** @typedef VMCPUCC
+ * Context specific VMCPU derived structure.
+ * This is plain VM in ring-3 and GVMCPU (inherits from VMCPU) in ring-0. */
+#ifdef IN_RING0
+typedef GVM VMCC;
+typedef GVMCPU VMCPUCC;
+#else
+typedef VM VMCC;
+typedef VMCPU VMCPUCC;
+#endif
+
+/** @def VMCC_GET_CPU_0
+ * Gets the context specfic pointer to virtual CPU \#0.
+ * @param a_pVM The context specfic VM structure.
+ */
+#ifdef IN_RING0
+# define VMCC_GET_CPU_0(a_pVM) (&(a_pVM)->aCpus[0])
+#else
+# define VMCC_GET_CPU_0(a_pVM) ((a_pVM)->CTX_SUFF(apCpus)[0])
+#endif
+
+/** @def VMCC_GET_CPU
+ * Gets the context specfic pointer to a virtual CPU by index (ID).
+ * @param a_pVM The context specfic VM structure.
+ * @param a_idCpu The CPU number to get (caller ensures validity).
+ */
+#ifdef IN_RING0
+# define VMCC_GET_CPU(a_pVM, a_idCpu) (&(a_pVM)->aCpus[(a_idCpu)])
+#else
+# define VMCC_GET_CPU(a_pVM, a_idCpu) ((a_pVM)->CTX_SUFF(apCpus)[(a_idCpu)])
+#endif
+
+/** @def VMCC_FOR_EACH_VMCPU
+ * For enumerating VCpus in ascending order, avoiding unnecessary apCpusR0
+ * access in ring-0, caching the CPU count and not checking for CPU \#0.
+ *
+ * Defines local variables @c idCpu, @c pVCpu and @c cCpus.
+ *
+ * @param a_pVM The VM handle.
+ *
+ * @note Close loop with VMCC_FOR_EACH_VMCPU_END.
+ */
+#define VMCC_FOR_EACH_VMCPU(a_pVM) \
+ do { \
+ VMCPUID idCpu = 0; \
+ VMCPUID const cCpus = (a_pVM)->cCpus; \
+ PVMCPUCC pVCpu = VMCC_GET_CPU_0(a_pVM); \
+ for (;;) \
+ {
+
+/** @def VMCC_FOR_EACH_VMCPU_END
+ * Ends a VMCC_FOR_EACH_VMCPU loop.
+ * @param a_pVM The VM handle.
+ */
+#define VMCC_FOR_EACH_VMCPU_END(a_pVM) \
+ /* advance */ \
+ if (++idCpu >= cCpus) \
+ break; \
+ pVCpu = VMCC_GET_CPU(pVM, idCpu); \
+ } \
+ } while (0)
+
+/**
+ * Execute the given statement for each virtual CPU in an environment with
+ * @c pVCpu and @c idCpu variables.
+ *
+ * @param a_pVM The VM handle.
+ * @param a_Stmt The statement to execute.
+ */
+#define VMCC_FOR_EACH_VMCPU_STMT(a_pVM, a_Stmt) VMCC_FOR_EACH_VMCPU(pVM) { a_Stmt; } VMCC_FOR_EACH_VMCPU_END(pVM)
+
+/** @def VMCC_GET_VMR0_FOR_CALL(pVM) */
+#if defined(IN_RING3)
+# define VMCC_GET_VMR0_FOR_CALL(a_pVM) ((a_pVM)->pVMR0ForCall)
+#elif defined(IN_RING3)
+# define VMCC_GET_VMR0_FOR_CALL(a_pVM) ((a_pVM)->pVMR0)
+#else
+# define VMCC_GET_VMR0_FOR_CALL(a_pVM) ((a_pVM)->ring3_only_macro)
+#endif
+
+
+/**
+ * Used to pick ring-0 or ring-3 VM component data.
+ *
+ * @code{.cpp}
+ * pVM->VMCC_CTX(pdm).s.pfnWorker
+ * @endcode
+ */
+#ifdef IN_RING0
+# define VMCC_CTX(a_Name) a_Name ## r0
+#else
+# define VMCC_CTX(a_Name) a_Name
+#endif
+
+#endif /* !VBOX_INCLUDED_vmm_vmcc_h */
+