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diff --git a/include/VBox/vmm/pdmcritsect.h b/include/VBox/vmm/pdmcritsect.h
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+/** @file
+ * PDM - Pluggable Device Manager, Critical Sections.
+ */
+
+/*
+ * 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_pdmcritsect_h
+#define VBOX_INCLUDED_vmm_pdmcritsect_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <VBox/types.h>
+#include <iprt/critsect.h>
+
+
+RT_C_DECLS_BEGIN
+
+/** @defgroup grp_pdm_critsect The PDM Critical Section API
+ * @ingroup grp_pdm
+ * @{
+ */
+
+/**
+ * A PDM critical section.
+ * Initialize using PDMDRVHLP::pfnCritSectInit().
+ */
+typedef union PDMCRITSECT
+{
+ /** Padding. */
+ uint8_t padding[HC_ARCH_BITS == 32 ? 0xc0 : 0x100];
+#ifdef PDMCRITSECTINT_DECLARED
+ /** The internal structure (not normally visible). */
+ struct PDMCRITSECTINT s;
+#endif
+} PDMCRITSECT;
+
+VMMR3_INT_DECL(int) PDMR3CritSectBothTerm(PVM pVM);
+VMMR3_INT_DECL(void) PDMR3CritSectLeaveAll(PVM pVM);
+VMM_INT_DECL(void) PDMCritSectBothFF(PVMCC pVM, PVMCPUCC pVCpu);
+
+
+VMMR3DECL(uint32_t) PDMR3CritSectCountOwned(PVM pVM, char *pszNames, size_t cbNames);
+
+VMMR3DECL(int) PDMR3CritSectInit(PVM pVM, PPDMCRITSECT pCritSect, RT_SRC_POS_DECL,
+ const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR(6, 7);
+VMMR3DECL(int) PDMR3CritSectEnterEx(PVM pVM, PPDMCRITSECT pCritSect, bool fCallRing3);
+VMMR3DECL(bool) PDMR3CritSectYield(PVM pVM, PPDMCRITSECT pCritSect);
+VMMR3DECL(const char *) PDMR3CritSectName(PCPDMCRITSECT pCritSect);
+VMMR3DECL(int) PDMR3CritSectDelete(PVM pVM, PPDMCRITSECT pCritSect);
+#if defined(IN_RING0) || defined(IN_RING3)
+VMMDECL(int) PDMHCCritSectScheduleExitEvent(PPDMCRITSECT pCritSect, SUPSEMEVENT hEventToSignal);
+#endif
+
+VMMDECL(DECL_CHECK_RETURN_NOT_R3(int))
+ PDMCritSectEnter(PVMCC pVM, PPDMCRITSECT pCritSect, int rcBusy);
+VMMDECL(DECL_CHECK_RETURN_NOT_R3(int))
+ PDMCritSectEnterDebug(PVMCC pVM, PPDMCRITSECT pCritSect, int rcBusy, RTHCUINTPTR uId, RT_SRC_POS_DECL);
+VMMDECL(DECL_CHECK_RETURN(int))
+ PDMCritSectTryEnter(PVMCC pVM, PPDMCRITSECT pCritSect);
+VMMDECL(DECL_CHECK_RETURN(int))
+ PDMCritSectTryEnterDebug(PVMCC pVM, PPDMCRITSECT pCritSect, RTHCUINTPTR uId, RT_SRC_POS_DECL);
+VMMDECL(int) PDMCritSectLeave(PVMCC pVM, PPDMCRITSECT pCritSect);
+
+VMMDECL(bool) PDMCritSectIsOwner(PVMCC pVM, PCPDMCRITSECT pCritSect);
+VMMDECL(bool) PDMCritSectIsOwnerEx(PVMCPUCC pVCpu, PCPDMCRITSECT pCritSect);
+VMMDECL(bool) PDMCritSectIsInitialized(PCPDMCRITSECT pCritSect);
+VMMDECL(bool) PDMCritSectHasWaiters(PVMCC pVM, PCPDMCRITSECT pCritSect);
+VMMDECL(uint32_t) PDMCritSectGetRecursion(PCPDMCRITSECT pCritSect);
+
+VMMR3DECL(PPDMCRITSECT) PDMR3CritSectGetNop(PVM pVM);
+
+/* Strict build: Remap the two enter calls to the debug versions. */
+#ifdef VBOX_STRICT
+# ifdef IPRT_INCLUDED_asm_h
+# define PDMCritSectEnter(a_pVM, pCritSect, rcBusy) PDMCritSectEnterDebug((a_pVM), (pCritSect), (rcBusy), (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
+# define PDMCritSectTryEnter(a_pVM, pCritSect) PDMCritSectTryEnterDebug((a_pVM), (pCritSect), (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
+# else
+# define PDMCritSectEnter(a_pVM, pCritSect, rcBusy) PDMCritSectEnterDebug((a_pVM), (pCritSect), (rcBusy), 0, RT_SRC_POS)
+# define PDMCritSectTryEnter(a_pVM, pCritSect) PDMCritSectTryEnterDebug((a_pVM), (pCritSect), 0, RT_SRC_POS)
+# endif
+#endif
+
+/** @def PDM_CRITSECT_RELEASE_ASSERT_RC
+ * Helper for PDMCritSectEnter w/ rcBusy VINF_SUCCESS when there is no way
+ * to forward failures to the caller. */
+#define PDM_CRITSECT_RELEASE_ASSERT_RC(a_pVM, a_pCritSect, a_rc) \
+ AssertReleaseMsg(RT_SUCCESS(a_rc), ("pVM=%p pCritSect=%p: %Rrc\n", (a_pVM), (a_pCritSect), (a_rc)))
+
+/** @def PDM_CRITSECT_RELEASE_ASSERT_RC_DEV
+ * Helper for PDMCritSectEnter w/ rcBusy VINF_SUCCESS when there is no way
+ * to forward failures to the caller, device edition. */
+#define PDM_CRITSECT_RELEASE_ASSERT_RC_DEV(a_pDevIns, a_pCritSect, a_rc) \
+ AssertReleaseMsg(RT_SUCCESS(a_rc), ("pDevIns=%p pCritSect=%p: %Rrc\n", (a_pDevIns), (a_pCritSect), (a_rc)))
+
+/** @def PDM_CRITSECT_RELEASE_ASSERT_RC_DRV
+ * Helper for PDMCritSectEnter w/ rcBusy VINF_SUCCESS when there is no way
+ * to forward failures to the caller, driver edition. */
+#define PDM_CRITSECT_RELEASE_ASSERT_RC_DRV(a_pDrvIns, a_pCritSect, a_rc) \
+ AssertReleaseMsg(RT_SUCCESS(a_rc), ("pDrvIns=%p pCritSect=%p: %Rrc\n", (a_pDrvIns), (a_pCritSect), (a_rc)))
+
+/** @def PDM_CRITSECT_RELEASE_ASSERT_RC_USB
+ * Helper for PDMCritSectEnter w/ rcBusy VINF_SUCCESS when there is no way
+ * to forward failures to the caller, USB device edition. */
+#define PDM_CRITSECT_RELEASE_ASSERT_RC_USB(a_pUsbIns, a_pCritSect, a_rc) \
+ AssertReleaseMsg(RT_SUCCESS(a_rc), ("pUsbIns=%p pCritSect=%p: %Rrc\n", (a_pUsbIns), (a_pCritSect), (a_rc)))
+
+
+/** @} */
+
+RT_C_DECLS_END
+
+#endif /* !VBOX_INCLUDED_vmm_pdmcritsect_h */
+