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diff --git a/include/VBox/vmm/pdmqueue.h b/include/VBox/vmm/pdmqueue.h
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+/** @file
+ * PDM - Pluggable Device Manager, Queues.
+ */
+
+/*
+ * 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_pdmqueue_h
+#define VBOX_INCLUDED_vmm_pdmqueue_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <VBox/types.h>
+
+RT_C_DECLS_BEGIN
+
+/** @defgroup grp_pdm_queue The PDM Queues API
+ * @ingroup grp_pdm
+ * @{
+ */
+
+/** Pointer to a PDM queue. */
+typedef struct PDMQUEUE *PPDMQUEUE;
+
+/** Pointer to a PDM queue item core. */
+typedef union PDMQUEUEITEMCORE *PPDMQUEUEITEMCORE;
+
+/**
+ * PDM queue item core.
+ */
+typedef union PDMQUEUEITEMCORE
+{
+ /** The next queue item on the pending list (UINT32_MAX for NIL). */
+ uint32_t volatile iNext;
+ /** The next item about to be flushed. */
+ R3PTRTYPE(PPDMQUEUEITEMCORE) pNext;
+ /** Make sure the core is 64-bit wide. */
+ uint64_t u64View;
+} PDMQUEUEITEMCORE;
+
+
+/**
+ * Queue consumer callback for devices.
+ *
+ * @returns Success indicator.
+ * If false the item will not be removed and the flushing will stop.
+ * @param pDevIns The device instance.
+ * @param pItem The item to consume. Upon return this item will be freed.
+ * @remarks The device critical section will NOT be entered before calling the
+ * callback. No locks will be held, but for now it's safe to assume
+ * that only one EMT will do queue callbacks at any one time.
+ */
+typedef DECLCALLBACKTYPE(bool, FNPDMQUEUEDEV,(PPDMDEVINS pDevIns, PPDMQUEUEITEMCORE pItem));
+/** Pointer to a FNPDMQUEUEDEV(). */
+typedef FNPDMQUEUEDEV *PFNPDMQUEUEDEV;
+
+/**
+ * Queue consumer callback for USB devices.
+ *
+ * @returns Success indicator.
+ * If false the item will not be removed and the flushing will stop.
+ * @param pUsbIns The USB device instance.
+ * @param pItem The item to consume. Upon return this item will be freed.
+ * @remarks No locks will be held, but for now it's safe to assume that only one
+ * EMT will do queue callbacks at any one time.
+ */
+typedef DECLCALLBACKTYPE(bool, FNPDMQUEUEUSB,(PPDMUSBINS pUsbIns, PPDMQUEUEITEMCORE pItem));
+/** Pointer to a FNPDMQUEUEUSB(). */
+typedef FNPDMQUEUEUSB *PFNPDMQUEUEUSB;
+
+/**
+ * Queue consumer callback for drivers.
+ *
+ * @returns Success indicator.
+ * If false the item will not be removed and the flushing will stop.
+ * @param pDrvIns The driver instance.
+ * @param pItem The item to consume. Upon return this item will be freed.
+ * @remarks No locks will be held, but for now it's safe to assume that only one
+ * EMT will do queue callbacks at any one time.
+ */
+typedef DECLCALLBACKTYPE(bool, FNPDMQUEUEDRV,(PPDMDRVINS pDrvIns, PPDMQUEUEITEMCORE pItem));
+/** Pointer to a FNPDMQUEUEDRV(). */
+typedef FNPDMQUEUEDRV *PFNPDMQUEUEDRV;
+
+/**
+ * Queue consumer callback for internal component.
+ *
+ * @returns Success indicator.
+ * If false the item will not be removed and the flushing will stop.
+ * @param pVM The cross context VM structure.
+ * @param pItem The item to consume. Upon return this item will be freed.
+ * @remarks No locks will be held, but for now it's safe to assume that only one
+ * EMT will do queue callbacks at any one time.
+ */
+typedef DECLCALLBACKTYPE(bool, FNPDMQUEUEINT,(PVM pVM, PPDMQUEUEITEMCORE pItem));
+/** Pointer to a FNPDMQUEUEINT(). */
+typedef FNPDMQUEUEINT *PFNPDMQUEUEINT;
+
+/**
+ * Queue consumer callback for external component.
+ *
+ * @returns Success indicator.
+ * If false the item will not be removed and the flushing will stop.
+ * @param pvUser User argument.
+ * @param pItem The item to consume. Upon return this item will be freed.
+ * @remarks No locks will be held, but for now it's safe to assume that only one
+ * EMT will do queue callbacks at any one time.
+ */
+typedef DECLCALLBACKTYPE(bool, FNPDMQUEUEEXT,(void *pvUser, PPDMQUEUEITEMCORE pItem));
+/** Pointer to a FNPDMQUEUEEXT(). */
+typedef FNPDMQUEUEEXT *PFNPDMQUEUEEXT;
+
+#ifdef VBOX_IN_VMM
+VMMR3_INT_DECL(int) PDMR3QueueCreateDevice(PVM pVM, PPDMDEVINS pDevIns, size_t cbItem, uint32_t cItems,
+ uint32_t cMilliesInterval, PFNPDMQUEUEDEV pfnCallback,
+ bool fRZEnabled, const char *pszName, PDMQUEUEHANDLE *phQueue);
+VMMR3_INT_DECL(int) PDMR3QueueCreateDriver(PVM pVM, PPDMDRVINS pDrvIns, size_t cbItem, uint32_t cItems,
+ uint32_t cMilliesInterval, PFNPDMQUEUEDRV pfnCallback,
+ const char *pszName, PDMQUEUEHANDLE *phQueue);
+VMMR3_INT_DECL(int) PDMR3QueueCreateInternal(PVM pVM, size_t cbItem, uint32_t cItems,
+ uint32_t cMilliesInterval, PFNPDMQUEUEINT pfnCallback,
+ bool fRZEnabled, const char *pszName, PDMQUEUEHANDLE *phQueue);
+VMMR3DECL(int) PDMR3QueueCreateExternal(PVM pVM, size_t cbItem, uint32_t cItems, uint32_t cMilliesInterval,
+ PFNPDMQUEUEEXT pfnCallback, void *pvUser, const char *pszName, PDMQUEUEHANDLE *phQueue);
+VMMR3DECL(int) PDMR3QueueDestroy(PVM pVM, PDMQUEUEHANDLE hQueue, void *pvOwner);
+VMMR3_INT_DECL(int) PDMR3QueueDestroyDevice(PVM pVM, PPDMDEVINS pDevIns);
+VMMR3_INT_DECL(int) PDMR3QueueDestroyDriver(PVM pVM, PPDMDRVINS pDrvIns);
+VMMR3DECL(void) PDMR3QueueFlushAll(PVM pVM);
+#endif /* VBOX_IN_VMM */
+
+VMMDECL(PPDMQUEUEITEMCORE) PDMQueueAlloc(PVMCC pVM, PDMQUEUEHANDLE hQueue, void *pvOwner);
+VMMDECL(int) PDMQueueInsert(PVMCC pVM, PDMQUEUEHANDLE hQueue, void *pvOwner, PPDMQUEUEITEMCORE pInsert);
+VMMDECL(int) PDMQueueFlushIfNecessary(PVMCC pVM, PDMQUEUEHANDLE hQueue, void *pvOwner);
+
+/** @} */
+
+RT_C_DECLS_END
+
+#endif /* !VBOX_INCLUDED_vmm_pdmqueue_h */
+