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diff --git a/include/VBox/vmm/pdmcritsectrw.h b/include/VBox/vmm/pdmcritsectrw.h
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+/** @file
+ * PDM - Pluggable Device Manager, Read/Write Critical Section.
+ */
+
+/*
+ * Copyright (C) 2006-2023 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_pdmcritsectrw_h
+#define VBOX_INCLUDED_vmm_pdmcritsectrw_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <VBox/types.h>
+
+
+RT_C_DECLS_BEGIN
+
+/** @defgroup grp_pdm_critsectrw The PDM Read/Write Critical Section API
+ * @ingroup grp_pdm
+ * @{
+ */
+
+/**
+ * A PDM read/write critical section.
+ * Initialize using PDMDRVHLP::pfnCritSectRwInit().
+ */
+typedef union PDMCRITSECTRW
+{
+ /** Padding. */
+ uint8_t padding[HC_ARCH_BITS == 32 ? 0xc0 : 0x100];
+#ifdef PDMCRITSECTRWINT_DECLARED
+ /** The internal structure (not normally visible). */
+ struct PDMCRITSECTRWINT s;
+#endif
+} PDMCRITSECTRW;
+
+VMMR3DECL(int) PDMR3CritSectRwInit(PVM pVM, PPDMCRITSECTRW pCritSect, RT_SRC_POS_DECL,
+ const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR(6, 7);
+VMMR3DECL(int) PDMR3CritSectRwDelete(PVM pVM, PPDMCRITSECTRW pCritSect);
+VMMR3DECL(const char *) PDMR3CritSectRwName(PCPDMCRITSECTRW pCritSect);
+VMMR3DECL(int) PDMR3CritSectRwEnterSharedEx(PVM pVM, PPDMCRITSECTRW pThis, bool fCallRing3);
+VMMR3DECL(int) PDMR3CritSectRwEnterExclEx(PVM pVM, PPDMCRITSECTRW pThis, bool fCallRing3);
+
+VMMDECL(int) PDMCritSectRwEnterShared(PVMCC pVM, PPDMCRITSECTRW pCritSect, int rcBusy);
+VMMDECL(int) PDMCritSectRwEnterSharedDebug(PVMCC pVM, PPDMCRITSECTRW pCritSect, int rcBusy, RTHCUINTPTR uId, RT_SRC_POS_DECL);
+VMMDECL(int) PDMCritSectRwTryEnterShared(PVMCC pVM, PPDMCRITSECTRW pCritSect);
+VMMDECL(int) PDMCritSectRwTryEnterSharedDebug(PVMCC pVM, PPDMCRITSECTRW pCritSect, RTHCUINTPTR uId, RT_SRC_POS_DECL);
+VMMDECL(int) PDMCritSectRwLeaveShared(PVMCC pVM, PPDMCRITSECTRW pCritSect);
+VMMDECL(int) PDMCritSectRwEnterExcl(PVMCC pVM, PPDMCRITSECTRW pCritSect, int rcBusy);
+VMMDECL(int) PDMCritSectRwEnterExclDebug(PVMCC pVM, PPDMCRITSECTRW pCritSect, int rcBusy, RTHCUINTPTR uId, RT_SRC_POS_DECL);
+VMMDECL(int) PDMCritSectRwTryEnterExcl(PVMCC pVM, PPDMCRITSECTRW pCritSect);
+VMMDECL(int) PDMCritSectRwTryEnterExclDebug(PVMCC pVM, PPDMCRITSECTRW pCritSect, RTHCUINTPTR uId, RT_SRC_POS_DECL);
+VMMDECL(int) PDMCritSectRwLeaveExcl(PVMCC pVM, PPDMCRITSECTRW pCritSect);
+
+VMMDECL(bool) PDMCritSectRwIsWriteOwner(PVMCC pVM, PPDMCRITSECTRW pCritSect);
+VMMDECL(bool) PDMCritSectRwIsReadOwner(PVMCC pVM, PPDMCRITSECTRW pCritSect, bool fWannaHear);
+VMMDECL(uint32_t) PDMCritSectRwGetWriteRecursion(PPDMCRITSECTRW pCritSect);
+VMMDECL(uint32_t) PDMCritSectRwGetWriterReadRecursion(PPDMCRITSECTRW pCritSect);
+VMMDECL(uint32_t) PDMCritSectRwGetReadCount(PPDMCRITSECTRW pCritSect);
+VMMDECL(bool) PDMCritSectRwIsInitialized(PCPDMCRITSECTRW pCritSect);
+
+/* Lock strict build: Remap the three enter calls to the debug versions. */
+#ifdef VBOX_STRICT
+# ifdef IPRT_INCLUDED_asm_h
+# define PDMCritSectRwEnterExcl(a_pVM, pCritSect, rcBusy) PDMCritSectRwEnterExclDebug((a_pVM), pCritSect, rcBusy, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
+# define PDMCritSectRwTryEnterExcl(a_pVM, pCritSect) PDMCritSectRwTryEnterExclDebug((a_pVM), pCritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
+# define PDMCritSectRwEnterShared(a_pVM, pCritSect, rcBusy) PDMCritSectRwEnterSharedDebug((a_pVM), pCritSect, rcBusy, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
+# define PDMCritSectRwTryEnterShared(a_pVM, pCritSect) PDMCritSectRwTryEnterSharedDebug((a_pVM), pCritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
+# else
+# define PDMCritSectRwEnterExcl(a_pVM, pCritSect, rcBusy) PDMCritSectRwEnterExclDebug((a_pVM), pCritSect, rcBusy, 0, RT_SRC_POS)
+# define PDMCritSectRwTryEnterExcl(a_pVM, pCritSect) PDMCritSectRwTryEnterExclDebug((a_pVM), pCritSect, 0, RT_SRC_POS)
+# define PDMCritSectRwEnterShared(a_pVM, pCritSect, rcBusy) PDMCritSectRwEnterSharedDebug((a_pVM), pCritSect, rcBusy, 0, RT_SRC_POS)
+# define PDMCritSectRwTryEnterShared(a_pVM, pCritSect) PDMCritSectRwTryEnterSharedDebug((a_pVM), pCritSect, 0, RT_SRC_POS)
+# endif
+#endif
+
+/** @} */
+
+RT_C_DECLS_END
+
+#endif /* !VBOX_INCLUDED_vmm_pdmcritsectrw_h */
+