Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 1221 insertions, 0 deletions

diff --git a/src/VBox/Devices/Samples/DevPlayground.cpp b/src/VBox/Devices/Samples/DevPlayground.cpp
new file mode 100644
index 00000000..74f9b5ad
--- /dev/null
+++ b/src/VBox/Devices/Samples/DevPlayground.cpp
@@ -0,0 +1,364 @@
+/* $Id: DevPlayground.cpp $ */
+/** @file
+ * DevPlayground - Device for making PDM/PCI/... experiments.
+ *
+ * This device uses big PCI BAR64 resources, which needs the ICH9 chipset.
+ * The device works without any PCI config (because the default setup with the
+ * ICH9 chipset doesn't have anything at bus=0, device=0, function=0.
+ *
+ * To enable this device for a particular VM:
+ * VBoxManage setextradata vmname VBoxInternal/PDM/Devices/playground/Path .../obj/VBoxPlaygroundDevice/VBoxPlaygroundDevice
+ * VBoxManage setextradata vmname VBoxInternal/Devices/playground/0/Config/Whatever1 0
+ */
+
+/*
+ * Copyright (C) 2009-2019 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP LOG_GROUP_MISC
+#include <VBox/vmm/pdmdev.h>
+#include <VBox/version.h>
+#include <VBox/err.h>
+#include <VBox/log.h>
+
+#include <VBox/com/assert.h>
+#include <VBox/com/defs.h>
+#include <VBox/com/string.h>
+#include <VBox/com/Guid.h>
+#include <VBox/com/VirtualBox.h>
+
+#include <iprt/assert.h>
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Playground device per function (sub-device) data.
+ */
+typedef struct VBOXPLAYGROUNDDEVICEFUNCTION
+{
+    /** The PCI devices. */
+    PDMPCIDEV   PciDev;
+    /** The function number. */
+    uint8_t     iFun;
+    /** Device function name. */
+    char        szName[31];
+} VBOXPLAYGROUNDDEVICEFUNCTION;
+/** Pointer to a PCI function of the playground device. */
+typedef VBOXPLAYGROUNDDEVICEFUNCTION *PVBOXPLAYGROUNDDEVICEFUNCTION;
+
+/**
+ * Playground device instance data.
+ */
+typedef struct VBOXPLAYGROUNDDEVICE
+{
+    /** PCI device functions. */
+    VBOXPLAYGROUNDDEVICEFUNCTION aPciFuns[8];
+} VBOXPLAYGROUNDDEVICE;
+/** Pointer to the instance data of a playground device instance. */
+typedef VBOXPLAYGROUNDDEVICE *PVBOXPLAYGROUNDDEVICE;
+
+
+#define PLAYGROUND_SSM_VERSION 3
+
+
+/*********************************************************************************************************************************
+*   Device Functions                                                                                                             *
+*********************************************************************************************************************************/
+
+PDMBOTHCBDECL(int) devPlaygroundMMIORead(PPDMDEVINS pDevIns, void *pvUser, RTGCPHYS GCPhysAddr, void *pv, unsigned cb)
+{
+    NOREF(pDevIns);
+    NOREF(pvUser);
+    NOREF(GCPhysAddr);
+    NOREF(pv);
+    NOREF(cb);
+    return VINF_SUCCESS;
+}
+
+
+PDMBOTHCBDECL(int) devPlaygroundMMIOWrite(PPDMDEVINS pDevIns, void *pvUser, RTGCPHYS GCPhysAddr, void const *pv, unsigned cb)
+{
+    NOREF(pDevIns);
+    NOREF(pvUser);
+    NOREF(GCPhysAddr);
+    NOREF(pv);
+    NOREF(cb);
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * @callback_method_impl{FNPCIIOREGIONMAP}
+ */
+static DECLCALLBACK(int) devPlaygroundMap(PPDMDEVINS pDevIns, PPDMPCIDEV pPciDev, uint32_t iRegion,
+                                          RTGCPHYS GCPhysAddress, RTGCPHYS cb, PCIADDRESSSPACE enmType)
+{
+    RT_NOREF(pPciDev, enmType, cb);
+
+    switch (iRegion)
+    {
+        case 0:
+        case 2:
+            Assert(   enmType == (PCIADDRESSSPACE)(PCI_ADDRESS_SPACE_MEM | PCI_ADDRESS_SPACE_BAR64)
+                   || enmType == (PCIADDRESSSPACE)(PCI_ADDRESS_SPACE_MEM_PREFETCH | PCI_ADDRESS_SPACE_BAR64));
+            if (GCPhysAddress == NIL_RTGCPHYS)
+                return VINF_SUCCESS; /* We ignore the unmap notification. */
+            return PDMDevHlpMMIOExMap(pDevIns, pPciDev, iRegion, GCPhysAddress);
+
+        default:
+            /* We should never get here */
+            AssertMsgFailedReturn(("Invalid PCI region param in map callback"), VERR_INTERNAL_ERROR);
+    }
+}
+
+
+/**
+ * @callback_method_impl{FNSSMDEVSAVEEXEC}
+ */
+static DECLCALLBACK(int) devPlaygroundSaveExec(PPDMDEVINS pDevIns, PSSMHANDLE pSSM)
+{
+    PVBOXPLAYGROUNDDEVICE pThis = PDMINS_2_DATA(pDevIns, PVBOXPLAYGROUNDDEVICE);
+
+    /* dummy (real devices would need to save their state here) */
+    RT_NOREF(pThis);
+
+    /* Demo of some API stuff - very unusual, think twice if there's no better
+     * solution which doesn't need API interaction. */
+    HRESULT hrc = S_OK;
+    com::Bstr bstrSnapName;
+    com::Guid uuid(COM_IIDOF(ISnapshot));
+    ISnapshot *pSnap = (ISnapshot *)PDMDevHlpQueryGenericUserObject(pDevIns, uuid.raw());
+    if (pSnap)
+    {
+        hrc = pSnap->COMGETTER(Name)(bstrSnapName.asOutParam());
+        AssertComRCReturn(hrc, VERR_INVALID_STATE);
+    }
+    com::Utf8Str strSnapName(bstrSnapName);
+    SSMR3PutStrZ(pSSM, strSnapName.c_str());
+    LogRel(("Playground: saving state of snapshot '%s', hrc=%Rhrc\n", strSnapName.c_str(), hrc));
+
+    return VINF_SUCCESS;
+}
+
+/**
+ * @callback_method_impl{FNSSMDEVLOADEXEC}
+ */
+static DECLCALLBACK(int) devPlaygroundLoadExec(PPDMDEVINS pDevIns, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass)
+{
+    PVBOXPLAYGROUNDDEVICE pThis = PDMINS_2_DATA(pDevIns, PVBOXPLAYGROUNDDEVICE);
+
+    if (uVersion > PLAYGROUND_SSM_VERSION)
+        return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
+    Assert(uPass == SSM_PASS_FINAL); NOREF(uPass);
+
+    /* dummy (real devices would need to load their state here) */
+    RT_NOREF(pThis);
+
+    /* Reading the stuff written to saved state, just a demo. */
+    char szSnapName[256];
+    int rc = SSMR3GetStrZ(pSSM, szSnapName, sizeof(szSnapName));
+    AssertRCReturn(rc, rc);
+    LogRel(("Playground: loading state of snapshot '%s'\n", szSnapName));
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * @interface_method_impl{PDMDEVREG,pfnConstruct}
+ */
+static DECLCALLBACK(int) devPlaygroundConstruct(PPDMDEVINS pDevIns, int iInstance, PCFGMNODE pCfg)
+{
+    RT_NOREF(iInstance, pCfg);
+    int rc = VINF_SUCCESS;
+
+    /*
+     * Check that the device instance and device helper structures are compatible.
+     */
+    PDMDEV_CHECK_VERSIONS_RETURN(pDevIns);
+
+    /*
+     * Initialize the instance data so that the destructor won't mess up.
+     */
+    PVBOXPLAYGROUNDDEVICE pThis = PDMINS_2_DATA(pDevIns, PVBOXPLAYGROUNDDEVICE);
+
+    /*
+     * Validate and read the configuration.
+     */
+    PDMDEV_VALIDATE_CONFIG_RETURN(pDevIns, "Whatever1|Whatever2", "");
+
+    /*
+     * PCI device setup.
+     */
+    uint32_t iPciDevNo = PDMPCIDEVREG_DEV_NO_FIRST_UNUSED;
+    for (uint32_t iPciFun = 0; iPciFun < RT_ELEMENTS(pThis->aPciFuns); iPciFun++)
+    {
+        PVBOXPLAYGROUNDDEVICEFUNCTION pFun = &pThis->aPciFuns[iPciFun];
+        RTStrPrintf(pFun->szName, sizeof(pThis->aPciFuns[iPciFun].PciDev), "playground%u", iPciFun);
+        pFun->iFun = iPciFun;
+
+        PCIDevSetVendorId( &pFun->PciDev, 0x80ee);
+        PCIDevSetDeviceId( &pFun->PciDev, 0xde4e);
+        PCIDevSetClassBase(&pFun->PciDev, 0x07);   /* communications device */
+        PCIDevSetClassSub( &pFun->PciDev, 0x80);   /* other communications device */
+        if (iPciFun == 0)       /* only for the primary function */
+            PCIDevSetHeaderType(&pFun->PciDev, 0x80); /* normal, multifunction device */
+
+        rc = PDMDevHlpPCIRegisterEx(pDevIns, &pFun->PciDev, iPciFun, 0 /*fFlags*/, iPciDevNo, iPciFun,
+                                        pThis->aPciFuns[iPciFun].szName);
+        AssertLogRelRCReturn(rc, rc);
+
+        /* First region. */
+        RTGCPHYS const cbFirst = iPciFun == 0 ? 8*_1M : iPciFun * _4K;
+        rc = PDMDevHlpPCIIORegionRegisterEx(pDevIns, &pFun->PciDev, 0, cbFirst,
+                                            (PCIADDRESSSPACE)(  PCI_ADDRESS_SPACE_MEM | PCI_ADDRESS_SPACE_BAR64
+                                                              | (iPciFun == 0 ? PCI_ADDRESS_SPACE_MEM_PREFETCH : 0)),
+                                            devPlaygroundMap);
+        AssertLogRelRCReturn(rc, rc);
+        char *pszRegionName = NULL;
+        RTStrAPrintf(&pszRegionName, "PG-F%d-BAR0", iPciFun);
+        Assert(pszRegionName);
+        rc = PDMDevHlpMMIOExPreRegister(pDevIns, &pFun->PciDev, 0, cbFirst,
+                                        IOMMMIO_FLAGS_READ_PASSTHRU | IOMMMIO_FLAGS_WRITE_PASSTHRU, pszRegionName,
+                                        NULL /*pvUser*/,  devPlaygroundMMIOWrite, devPlaygroundMMIORead, NULL /*pfnFill*/,
+                                        NIL_RTR0PTR /*pvUserR0*/, NULL /*pszWriteR0*/, NULL /*pszReadR0*/, NULL /*pszFillR0*/,
+                                        NIL_RTRCPTR /*pvUserRC*/, NULL /*pszWriteRC*/, NULL /*pszReadRC*/, NULL /*pszFillRC*/);
+        AssertLogRelRCReturn(rc, rc);
+
+        /* Second region. */
+        RTGCPHYS const cbSecond = iPciFun == 0  ? 32*_1M : iPciFun * _32K;
+        rc = PDMDevHlpPCIIORegionRegisterEx(pDevIns, &pFun->PciDev, 2, cbSecond,
+                                            (PCIADDRESSSPACE)(  PCI_ADDRESS_SPACE_MEM | PCI_ADDRESS_SPACE_BAR64
+                                                              | (iPciFun == 0 ? PCI_ADDRESS_SPACE_MEM_PREFETCH : 0)),
+                                            devPlaygroundMap);
+        AssertLogRelRCReturn(rc, rc);
+        pszRegionName = NULL;
+        RTStrAPrintf(&pszRegionName, "PG-F%d-BAR2", iPciFun);
+        Assert(pszRegionName);
+        rc = PDMDevHlpMMIOExPreRegister(pDevIns, &pFun->PciDev, 2, cbSecond,
+                                        IOMMMIO_FLAGS_READ_PASSTHRU | IOMMMIO_FLAGS_WRITE_PASSTHRU, pszRegionName,
+                                        NULL /*pvUser*/,  devPlaygroundMMIOWrite, devPlaygroundMMIORead, NULL /*pfnFill*/,
+                                        NIL_RTR0PTR /*pvUserR0*/, NULL /*pszWriteR0*/, NULL /*pszReadR0*/, NULL /*pszFillR0*/,
+                                        NIL_RTRCPTR /*pvUserRC*/, NULL /*pszWriteRC*/, NULL /*pszReadRC*/, NULL /*pszFillRC*/);
+        AssertLogRelRCReturn(rc, rc);
+
+        /* Subsequent function should use the same major as the previous one. */
+        iPciDevNo = PDMPCIDEVREG_DEV_NO_SAME_AS_PREV;
+    }
+
+    /*
+     * Save state handling.
+     */
+    rc = PDMDevHlpSSMRegister(pDevIns, PLAYGROUND_SSM_VERSION, sizeof(*pThis), devPlaygroundSaveExec, devPlaygroundLoadExec);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * @interface_method_impl{PDMDEVREG,pfnDestruct}
+ */
+static DECLCALLBACK(int) devPlaygroundDestruct(PPDMDEVINS pDevIns)
+{
+    /*
+     * Check the versions here as well since the destructor is *always* called.
+     */
+    PDMDEV_CHECK_VERSIONS_RETURN_QUIET(pDevIns);
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * The device registration structure.
+ */
+static const PDMDEVREG g_DevicePlayground =
+{
+    /* u32Version */
+    PDM_DEVREG_VERSION,
+    /* szName */
+    "playground",
+    /* szRCMod */
+    "",
+    /* szR0Mod */
+    "",
+    /* pszDescription */
+    "VBox Playground Device.",
+    /* fFlags */
+    PDM_DEVREG_FLAGS_DEFAULT_BITS,
+    /* fClass */
+    PDM_DEVREG_CLASS_MISC,
+    /* cMaxInstances */
+    1,
+    /* cbInstance */
+    sizeof(VBOXPLAYGROUNDDEVICE),
+    /* pfnConstruct */
+    devPlaygroundConstruct,
+    /* pfnDestruct */
+    devPlaygroundDestruct,
+    /* pfnRelocate */
+    NULL,
+    /* pfnMemSetup */
+    NULL,
+    /* pfnPowerOn */
+    NULL,
+    /* pfnReset */
+    NULL,
+    /* pfnSuspend */
+    NULL,
+    /* pfnResume */
+    NULL,
+    /* pfnAttach */
+    NULL,
+    /* pfnDetach */
+    NULL,
+    /* pfnQueryInterface */
+    NULL,
+    /* pfnInitComplete */
+    NULL,
+    /* pfnPowerOff */
+    NULL,
+    /* pfnSoftReset */
+    NULL,
+    /* u32VersionEnd */
+    PDM_DEVREG_VERSION
+};
+
+
+/**
+ * Register devices provided by the plugin.
+ *
+ * @returns VBox status code.
+ * @param   pCallbacks      Pointer to the callback table.
+ * @param   u32Version      VBox version number.
+ */
+extern "C" DECLEXPORT(int) VBoxDevicesRegister(PPDMDEVREGCB pCallbacks, uint32_t u32Version)
+{
+    LogFlow(("VBoxPlaygroundDevice::VBoxDevicesRegister: u32Version=%#x pCallbacks->u32Version=%#x\n", u32Version, pCallbacks->u32Version));
+
+    AssertLogRelMsgReturn(u32Version >= VBOX_VERSION,
+                          ("VirtualBox version %#x, expected %#x or higher\n", u32Version, VBOX_VERSION),
+                          VERR_VERSION_MISMATCH);
+    AssertLogRelMsgReturn(pCallbacks->u32Version == PDM_DEVREG_CB_VERSION,
+                          ("callback version %#x, expected %#x\n", pCallbacks->u32Version, PDM_DEVREG_CB_VERSION),
+                          VERR_VERSION_MISMATCH);
+
+    return pCallbacks->pfnRegister(pCallbacks, &g_DevicePlayground);
+}
+
diff --git a/src/VBox/Devices/Samples/DrvStorageFilter.cpp b/src/VBox/Devices/Samples/DrvStorageFilter.cpp
new file mode 100644
index 00000000..f038d5f9
--- /dev/null
+++ b/src/VBox/Devices/Samples/DrvStorageFilter.cpp
@@ -0,0 +1,590 @@
+/* $Id: DrvStorageFilter.cpp $ */
+/** @file
+ * VBox storage filter driver sample.
+ */
+
+/*
+ * Copyright (C) 2012-2019 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP LOG_GROUP_MISC
+#include <VBox/vmm/pdmdrv.h>
+#include <VBox/vmm/pdmstorageifs.h>
+#include <VBox/err.h>
+#include <VBox/log.h>
+#include <VBox/version.h>
+
+#include <iprt/uuid.h>
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Storage Filter Driver Instance Data.
+ */
+typedef struct DRVSTORAGEFILTER
+{
+    /** @name Interfaces exposed by this driver.
+     * @{ */
+    PDMIMEDIA           IMedia;
+    PDMIMEDIAPORT       IMediaPort;
+    PDMIMEDIAEX         IMediaEx;
+    PDMIMEDIAEXPORT     IMediaExPort;
+    /** @}  */
+
+    /** @name Interfaces exposed by the driver below us.
+     * @{ */
+    PPDMIMEDIA          pIMediaBelow;
+    PPDMIMEDIAEX        pIMediaExBelow;
+    /** @} */
+
+    /** @name Interfaces exposed by the driver/device above us.
+     * @{ */
+    PPDMIMEDIAPORT      pIMediaPortAbove;
+    PPDMIMEDIAEXPORT    pIMediaExPortAbove;
+    /** @} */
+
+    /** If clear, then suppress Async support. */
+    bool                fAsyncIOSupported;
+
+    /** @todo implement memfrob. */
+} DRVSTORAGEFILTER;
+/** Pointer to a storage filter driver instance. */
+typedef DRVSTORAGEFILTER *PDRVSTORAGEFILTER;
+
+
+
+/*
+ *
+ * IMediaPort Implementation.
+ *
+ */
+
+/** @interface_method_impl{PDMIMEDIAPORT,pfnQueryDeviceLocation} */
+static DECLCALLBACK(int) drvStorageFltIMediaPort_QueryDeviceLocation(PPDMIMEDIAPORT pInterface, const char **ppcszController,
+                                                                     uint32_t *piInstance, uint32_t *piLUN)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaPort);
+    int rc = pThis->pIMediaPortAbove->pfnQueryDeviceLocation(pThis->pIMediaPortAbove, ppcszController, piInstance, piLUN);
+    return rc;
+}
+
+
+/*
+ *
+ * IMedia Implementation.
+ *
+ */
+
+/** @interface_method_impl{PDMIMEDIA,pfnRead} */
+static DECLCALLBACK(int) drvStorageFltIMedia_Read(PPDMIMEDIA pInterface, uint64_t off, void *pvBuf, size_t cbRead)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMedia);
+    int rc = pThis->pIMediaBelow->pfnRead(pThis->pIMediaBelow, off, pvBuf, cbRead);
+    return rc;
+}
+
+/** @interface_method_impl{PDMIMEDIA,pfnWrite} */
+static DECLCALLBACK(int) drvStorageFltIMedia_Write(PPDMIMEDIA pInterface, uint64_t off, const void *pvBuf, size_t cbWrite)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMedia);
+    int rc = pThis->pIMediaBelow->pfnWrite(pThis->pIMediaBelow, off, pvBuf, cbWrite);
+    return rc;
+}
+
+/** @interface_method_impl{PDMIMEDIA,pfnFlush} */
+static DECLCALLBACK(int) drvStorageFltIMedia_Flush(PPDMIMEDIA pInterface)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMedia);
+    int rc = pThis->pIMediaBelow->pfnFlush(pThis->pIMediaBelow);
+    return rc;
+}
+
+/** @interface_method_impl{PDMIMEDIA,pfnMerge} */
+static DECLCALLBACK(int) drvStorageFltIMedia_Merge(PPDMIMEDIA pInterface, PFNSIMPLEPROGRESS pfnProgress, void *pvUser)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMedia);
+    int rc = pThis->pIMediaBelow->pfnMerge(pThis->pIMediaBelow, pfnProgress, pvUser);
+    return rc;
+}
+
+/** @interface_method_impl{PDMIMEDIA,pfnGetSize} */
+static DECLCALLBACK(uint64_t) drvStorageFltIMedia_GetSize(PPDMIMEDIA pInterface)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMedia);
+    uint64_t cb = pThis->pIMediaBelow->pfnGetSize(pThis->pIMediaBelow);
+    return cb;
+}
+
+/** @interface_method_impl{PDMIMEDIA,pfnIsReadOnly} */
+static DECLCALLBACK(bool) drvStorageFltIMedia_IsReadOnly(PPDMIMEDIA pInterface)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMedia);
+    bool fRc = pThis->pIMediaBelow->pfnIsReadOnly(pThis->pIMediaBelow);
+    return fRc;
+}
+
+/** @interface_method_impl{PDMIMEDIA,pfnBiosGetPCHSGeometry} */
+static DECLCALLBACK(int) drvStorageFltIMedia_BiosGetPCHSGeometry(PPDMIMEDIA pInterface, PPDMMEDIAGEOMETRY pPCHSGeometry)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMedia);
+    int rc = pThis->pIMediaBelow->pfnBiosGetPCHSGeometry(pThis->pIMediaBelow, pPCHSGeometry);
+    return rc;
+}
+
+/** @interface_method_impl{PDMIMEDIA,pfnBiosSetPCHSGeometry} */
+static DECLCALLBACK(int) drvStorageFltIMedia_BiosSetPCHSGeometry(PPDMIMEDIA pInterface, PCPDMMEDIAGEOMETRY pPCHSGeometry)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMedia);
+    int rc = pThis->pIMediaBelow->pfnBiosSetPCHSGeometry(pThis->pIMediaBelow, pPCHSGeometry);
+    return rc;
+}
+
+/** @interface_method_impl{PDMIMEDIA,pfnBiosGetLCHSGeometry} */
+static DECLCALLBACK(int) drvStorageFltIMedia_BiosGetLCHSGeometry(PPDMIMEDIA pInterface, PPDMMEDIAGEOMETRY pLCHSGeometry)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMedia);
+    int rc = pThis->pIMediaBelow->pfnBiosGetLCHSGeometry(pThis->pIMediaBelow, pLCHSGeometry);
+    return rc;
+}
+
+/** @interface_method_impl{PDMIMEDIA,pfnBiosSetLCHSGeometry} */
+static DECLCALLBACK(int) drvStorageFltIMedia_BiosSetLCHSGeometry(PPDMIMEDIA pInterface, PCPDMMEDIAGEOMETRY pLCHSGeometry)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMedia);
+    int rc = pThis->pIMediaBelow->pfnBiosSetLCHSGeometry(pThis->pIMediaBelow, pLCHSGeometry);
+    return rc;
+}
+
+/** @interface_method_impl{PDMIMEDIA,pfnGetUuid} */
+static DECLCALLBACK(int) drvStorageFltIMedia_GetUuid(PPDMIMEDIA pInterface, PRTUUID pUuid)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMedia);
+    int rc = pThis->pIMediaBelow->pfnGetUuid(pThis->pIMediaBelow, pUuid);
+    return rc;
+}
+
+/** @interface_method_impl{PDMIMEDIA,pfnDiscard} */
+static DECLCALLBACK(int) drvStorageFltIMedia_Discard(PPDMIMEDIA pInterface, PCRTRANGE paRanges, unsigned cRanges)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMedia);
+    int rc = pThis->pIMediaBelow->pfnDiscard(pThis->pIMediaBelow, paRanges, cRanges);
+    return rc;
+}
+
+
+/*
+ *
+ * IMediaExPort Implementation.
+ *
+ */
+
+/** @interface_method_impl{PDMIMEDIAEXPORT,pfnIoReqCompleteNotify} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqCompleteNotify(PPDMIMEDIAEXPORT pInterface, PDMMEDIAEXIOREQ hIoReq,
+                                                                 void *pvIoReqAlloc, int rcReq)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaExPort);
+    return pThis->pIMediaExPortAbove->pfnIoReqCompleteNotify(pThis->pIMediaExPortAbove, hIoReq, pvIoReqAlloc, rcReq);
+}
+
+
+/** @interface_method_impl{PDMIMEDIAEXPORT,pfnIoReqCopyFromBuf} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqCopyFromBuf(PPDMIMEDIAEXPORT pInterface, PDMMEDIAEXIOREQ hIoReq,
+                                                              void *pvIoReqAlloc, uint32_t offDst, PRTSGBUF pSgBuf,
+                                                              size_t cbCopy)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaExPort);
+    return pThis->pIMediaExPortAbove->pfnIoReqCopyFromBuf(pThis->pIMediaExPortAbove, hIoReq, pvIoReqAlloc,
+                                                       offDst, pSgBuf, cbCopy);
+}
+
+/** @interface_method_impl{PDMIMEDIAEXPORT,pfnIoReqCopyToBuf} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqCopyToBuf(PPDMIMEDIAEXPORT pInterface, PDMMEDIAEXIOREQ hIoReq,
+                                              void *pvIoReqAlloc, uint32_t offSrc, PRTSGBUF pSgBuf,
+                                              size_t cbCopy)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaExPort);
+    return pThis->pIMediaExPortAbove->pfnIoReqCopyToBuf(pThis->pIMediaExPortAbove, hIoReq, pvIoReqAlloc,
+                                                     offSrc, pSgBuf, cbCopy);
+}
+
+/** @interface_method_impl{PDMIMEDIAEXPORT,pfnIoReqQueryDiscardRanges} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqQueryDiscardRanges(PPDMIMEDIAEXPORT pInterface, PDMMEDIAEXIOREQ hIoReq,
+                                                       void *pvIoReqAlloc, uint32_t idxRangeStart,
+                                                       uint32_t cRanges, PRTRANGE paRanges,
+                                                       uint32_t *pcRanges)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaExPort);
+    return pThis->pIMediaExPortAbove->pfnIoReqQueryDiscardRanges(pThis->pIMediaExPortAbove, hIoReq, pvIoReqAlloc,
+                                                              idxRangeStart, cRanges, paRanges, pcRanges);
+}
+
+/** @interface_method_impl{PDMIMEDIAEXPORT,pfnIoReqStateChanged} */
+static DECLCALLBACK(void) drvStorageFltIMedia_IoReqStateChanged(PPDMIMEDIAEXPORT pInterface, PDMMEDIAEXIOREQ hIoReq,
+                                                                void *pvIoReqAlloc, PDMMEDIAEXIOREQSTATE enmState)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaExPort);
+    return pThis->pIMediaExPortAbove->pfnIoReqStateChanged(pThis->pIMediaExPortAbove, hIoReq, pvIoReqAlloc, enmState);
+}
+
+
+/*
+ *
+ * IMediaEx Implementation.
+ *
+ */
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnQueryFeatures} */
+static DECLCALLBACK(int) drvStorageFltIMedia_QueryFeatures(PPDMIMEDIAEX pInterface, uint32_t *pfFeatures)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+
+    int rc = pThis->pIMediaExBelow->pfnQueryFeatures(pThis->pIMediaExBelow, pfFeatures);
+    if (RT_SUCCESS(rc) && !pThis->fAsyncIOSupported)
+        *pfFeatures &= ~PDMIMEDIAEX_FEATURE_F_ASYNC;
+
+    return rc;
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqAllocSizeSet} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqAllocSizeSet(PPDMIMEDIAEX pInterface, size_t cbIoReqAlloc)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqAllocSizeSet(pThis->pIMediaExBelow, cbIoReqAlloc);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqAlloc} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqAlloc(PPDMIMEDIAEX pInterface, PPDMMEDIAEXIOREQ phIoReq, void **ppvIoReqAlloc,
+                                                        PDMMEDIAEXIOREQID uIoReqId, uint32_t fFlags)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+
+    if (!pThis->fAsyncIOSupported)
+        fFlags |= PDMIMEDIAEX_F_SYNC;
+    return pThis->pIMediaExBelow->pfnIoReqAlloc(pThis->pIMediaExBelow, phIoReq, ppvIoReqAlloc, uIoReqId, fFlags);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqFree} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqFree(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqFree(pThis->pIMediaExBelow, hIoReq);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqQueryResidual} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqQueryResidual(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, size_t *pcbResidual)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqQueryResidual(pThis->pIMediaExBelow, hIoReq, pcbResidual);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqCancelAll} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqCancelAll(PPDMIMEDIAEX pInterface)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqCancelAll(pThis->pIMediaExBelow);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqCancel} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqCancel(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQID uIoReqId)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqCancel(pThis->pIMediaExBelow, uIoReqId);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqRead} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqRead(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, uint64_t off, size_t cbRead)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqRead(pThis->pIMediaExBelow, hIoReq, off, cbRead);
+}
+
+/**
+ * @interface_method_impl{PDMIMEDIAEX,pfnIoReqWrite}
+ */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqWrite(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, uint64_t off, size_t cbWrite)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqWrite(pThis->pIMediaExBelow, hIoReq, off, cbWrite);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqFlush} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqFlush(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqFlush(pThis->pIMediaExBelow, hIoReq);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqDiscard} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqDiscard(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, unsigned cRangesMax)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqDiscard(pThis->pIMediaExBelow, hIoReq, cRangesMax);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqSendScsiCmd} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqSendScsiCmd(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq, uint32_t uLun,
+                                                              const uint8_t *pbCdb, size_t cbCdb, PDMMEDIAEXIOREQSCSITXDIR enmTxDir,
+                                                              size_t cbBuf, uint8_t *pabSense, size_t cbSense, uint8_t *pu8ScsiSts,
+                                                              uint32_t cTimeoutMillies)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqSendScsiCmd(pThis->pIMediaExBelow, hIoReq, uLun, pbCdb, cbCdb,
+                                                      enmTxDir, cbBuf, pabSense, cbSense, pu8ScsiSts,
+                                                      cTimeoutMillies);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqGetActiveCount} */
+static DECLCALLBACK(uint32_t) drvStorageFltIMedia_IoReqGetActiveCount(PPDMIMEDIAEX pInterface)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqGetActiveCount(pThis->pIMediaExBelow);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqGetSuspendedCount} */
+static DECLCALLBACK(uint32_t) drvStorageFltIMedia_IoReqGetSuspendedCount(PPDMIMEDIAEX pInterface)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqGetSuspendedCount(pThis->pIMediaExBelow);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqQuerySuspendedFirst} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqQuerySuspendedStart(PPDMIMEDIAEX pInterface, PPDMMEDIAEXIOREQ phIoReq,
+                                                                      void **ppvIoReqAlloc)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqQuerySuspendedStart(pThis->pIMediaExBelow, phIoReq, ppvIoReqAlloc);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqQuerySuspendedNext} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqQuerySuspendedNext(PPDMIMEDIAEX pInterface, PDMMEDIAEXIOREQ hIoReq,
+                                                                     PPDMMEDIAEXIOREQ phIoReqNext, void **ppvIoReqAllocNext)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqQuerySuspendedNext(pThis->pIMediaExBelow, hIoReq, phIoReqNext, ppvIoReqAllocNext);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqSuspendedSave} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqSuspendedSave(PPDMIMEDIAEX pInterface, PSSMHANDLE pSSM, PDMMEDIAEXIOREQ hIoReq)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqSuspendedSave(pThis->pIMediaExBelow, pSSM, hIoReq);
+}
+
+/** @interface_method_impl{PDMIMEDIAEX,pfnIoReqSuspendedLoad} */
+static DECLCALLBACK(int) drvStorageFltIMedia_IoReqSuspendedLoad(PPDMIMEDIAEX pInterface, PSSMHANDLE pSSM, PDMMEDIAEXIOREQ hIoReq)
+{
+    PDRVSTORAGEFILTER pThis = RT_FROM_MEMBER(pInterface, DRVSTORAGEFILTER, IMediaEx);
+    return pThis->pIMediaExBelow->pfnIoReqSuspendedLoad(pThis->pIMediaExBelow, pSSM, hIoReq);
+}
+
+
+/*
+ *
+ * IBase Implementation.
+ *
+ */
+
+
+static DECLCALLBACK(void *) drvStorageFltIBase_QueryInterface(PPDMIBASE pInterface, const char *pszIID)
+{
+    PPDMDRVINS          pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
+    PDRVSTORAGEFILTER   pThis   = PDMINS_2_DATA(pDrvIns, PDRVSTORAGEFILTER);
+
+    PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
+    if (pThis->pIMediaBelow)
+        PDMIBASE_RETURN_INTERFACE(pszIID, PDMIMEDIA, &pThis->IMedia);
+    if (pThis->pIMediaPortAbove)
+        PDMIBASE_RETURN_INTERFACE(pszIID, PDMIMEDIAPORT, &pThis->IMediaPort);
+    if (pThis->pIMediaExBelow)
+        PDMIBASE_RETURN_INTERFACE(pszIID, PDMIMEDIAEX, &pThis->IMediaEx);
+    if (pThis->pIMediaExPortAbove)
+        PDMIBASE_RETURN_INTERFACE(pszIID, PDMIMEDIAEXPORT, &pThis->IMediaExPort);
+
+    return NULL;
+}
+
+
+/*
+ *
+ * PDMDRVREG Methods
+ *
+ */
+
+
+/**
+ * Construct a storage filter driver.
+ *
+ * @copydoc FNPDMDRVCONSTRUCT
+ */
+static DECLCALLBACK(int) drvStorageFlt_Construct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
+{
+    PDRVSTORAGEFILTER   pThis   = PDMINS_2_DATA(pDrvIns, PDRVSTORAGEFILTER);
+
+    PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
+
+    /*
+     * Initialize the instance data.
+     */
+    pDrvIns->IBase.pfnQueryInterface     = drvStorageFltIBase_QueryInterface;
+
+    pThis->IMedia.pfnRead                = drvStorageFltIMedia_Read;
+    pThis->IMedia.pfnWrite               = drvStorageFltIMedia_Write;
+    pThis->IMedia.pfnFlush               = drvStorageFltIMedia_Flush;
+    pThis->IMedia.pfnMerge               = drvStorageFltIMedia_Merge;
+    pThis->IMedia.pfnGetSize             = drvStorageFltIMedia_GetSize;
+    pThis->IMedia.pfnIsReadOnly          = drvStorageFltIMedia_IsReadOnly;
+    pThis->IMedia.pfnBiosGetPCHSGeometry = drvStorageFltIMedia_BiosGetPCHSGeometry;
+    pThis->IMedia.pfnBiosSetPCHSGeometry = drvStorageFltIMedia_BiosSetPCHSGeometry;
+    pThis->IMedia.pfnBiosGetLCHSGeometry = drvStorageFltIMedia_BiosGetLCHSGeometry;
+    pThis->IMedia.pfnBiosSetLCHSGeometry = drvStorageFltIMedia_BiosSetLCHSGeometry;
+    pThis->IMedia.pfnGetUuid             = drvStorageFltIMedia_GetUuid;
+    pThis->IMedia.pfnDiscard             = drvStorageFltIMedia_Discard;
+
+    pThis->IMediaEx.pfnQueryFeatures            = drvStorageFltIMedia_QueryFeatures;
+    pThis->IMediaEx.pfnIoReqAllocSizeSet        = drvStorageFltIMedia_IoReqAllocSizeSet;
+    pThis->IMediaEx.pfnIoReqAlloc               = drvStorageFltIMedia_IoReqAlloc;
+    pThis->IMediaEx.pfnIoReqFree                = drvStorageFltIMedia_IoReqFree;
+    pThis->IMediaEx.pfnIoReqQueryResidual       = drvStorageFltIMedia_IoReqQueryResidual;
+    pThis->IMediaEx.pfnIoReqCancelAll           = drvStorageFltIMedia_IoReqCancelAll;
+    pThis->IMediaEx.pfnIoReqCancel              = drvStorageFltIMedia_IoReqCancel;
+    pThis->IMediaEx.pfnIoReqRead                = drvStorageFltIMedia_IoReqRead;
+    pThis->IMediaEx.pfnIoReqWrite               = drvStorageFltIMedia_IoReqWrite;
+    pThis->IMediaEx.pfnIoReqFlush               = drvStorageFltIMedia_IoReqFlush;
+    pThis->IMediaEx.pfnIoReqDiscard             = drvStorageFltIMedia_IoReqDiscard;
+    pThis->IMediaEx.pfnIoReqSendScsiCmd         = drvStorageFltIMedia_IoReqSendScsiCmd;
+    pThis->IMediaEx.pfnIoReqGetActiveCount      = drvStorageFltIMedia_IoReqGetActiveCount;
+    pThis->IMediaEx.pfnIoReqGetSuspendedCount   = drvStorageFltIMedia_IoReqGetSuspendedCount;
+    pThis->IMediaEx.pfnIoReqQuerySuspendedStart = drvStorageFltIMedia_IoReqQuerySuspendedStart;
+    pThis->IMediaEx.pfnIoReqQuerySuspendedNext  = drvStorageFltIMedia_IoReqQuerySuspendedNext;
+    pThis->IMediaEx.pfnIoReqSuspendedSave       = drvStorageFltIMedia_IoReqSuspendedSave;
+    pThis->IMediaEx.pfnIoReqSuspendedLoad       = drvStorageFltIMedia_IoReqSuspendedLoad;
+
+    pThis->IMediaPort.pfnQueryDeviceLocation = drvStorageFltIMediaPort_QueryDeviceLocation;
+
+    pThis->IMediaExPort.pfnIoReqCompleteNotify     = drvStorageFltIMedia_IoReqCompleteNotify;
+    pThis->IMediaExPort.pfnIoReqCopyFromBuf        = drvStorageFltIMedia_IoReqCopyFromBuf;
+    pThis->IMediaExPort.pfnIoReqCopyToBuf          = drvStorageFltIMedia_IoReqCopyToBuf;
+    pThis->IMediaExPort.pfnIoReqQueryDiscardRanges = drvStorageFltIMedia_IoReqQueryDiscardRanges;
+    pThis->IMediaExPort.pfnIoReqStateChanged       = drvStorageFltIMedia_IoReqStateChanged;
+
+    /*
+     * Validate and read config.
+     */
+    PDMDRV_VALIDATE_CONFIG_RETURN(pDrvIns, "AsyncIOSupported|", "");
+
+    int rc = CFGMR3QueryBoolDef(pCfg, "AsyncIOSupported", &pThis->fAsyncIOSupported, true);
+    AssertLogRelRCReturn(rc, rc);
+
+    /*
+     * Query interfaces from the driver/device above us.
+     */
+    pThis->pIMediaPortAbove   = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMIMEDIAPORT);
+    pThis->pIMediaExPortAbove = PDMIBASE_QUERY_INTERFACE(pDrvIns->pUpBase, PDMIMEDIAEXPORT);
+
+    /*
+     * Attach driver below us.
+     */
+    PPDMIBASE pIBaseBelow;
+    rc = PDMDrvHlpAttach(pDrvIns, fFlags, &pIBaseBelow);
+    AssertLogRelRCReturn(rc, rc);
+
+    pThis->pIMediaBelow   = PDMIBASE_QUERY_INTERFACE(pIBaseBelow, PDMIMEDIA);
+    pThis->pIMediaExBelow = PDMIBASE_QUERY_INTERFACE(pIBaseBelow, PDMIMEDIAEX);
+
+    AssertLogRelReturn(pThis->pIMediaBelow, VERR_PDM_MISSING_INTERFACE_BELOW);
+
+    if (!pThis->pIMediaBelow->pfnDiscard)
+        pThis->IMedia.pfnDiscard = NULL;
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Storage filter driver registration record.
+ */
+static const PDMDRVREG g_DrvStorageFilter =
+{
+    /* u32Version */
+    PDM_DRVREG_VERSION,
+    /* szName */
+    "StorageFilter",
+    /* szRCMod */
+    "",
+    /* szR0Mod */
+    "",
+    /* pszDescription */
+    "Storage Filter Driver Sample",
+    /* fFlags */
+    PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
+    /* fClass. */
+    PDM_DRVREG_CLASS_MEDIA,
+    /* cMaxInstances */
+    ~0U,
+    /* cbInstance */
+    sizeof(DRVSTORAGEFILTER),
+    /* pfnConstruct */
+    drvStorageFlt_Construct,
+    /* pfnDestruct */
+    NULL,
+    /* pfnRelocate */
+    NULL,
+    /* pfnIOCtl */
+    NULL,
+    /* pfnPowerOn */
+    NULL,
+    /* pfnReset */
+    NULL,
+    /* pfnSuspend */
+    NULL,
+    /* pfnResume */
+    NULL,
+    /* pfnAttach */
+    NULL,
+    /* pfnDetach */
+    NULL,
+    /* pfnPowerOff */
+    NULL,
+    /* pfnSoftReset */
+    NULL,
+    /* u32EndVersion */
+    PDM_DRVREG_VERSION
+};
+
+
+/**
+ * Register builtin devices.
+ *
+ * @returns VBox status code.
+ * @param   pCallbacks      Pointer to the callback table.
+ * @param   u32Version      VBox version number.
+ */
+extern "C" DECLEXPORT(int) VBoxDriversRegister(PPDMDRVREGCB pCallbacks, uint32_t u32Version)
+{
+    LogFlow(("VBoxSampleDriver::VBoxDriversRegister: u32Version=%#x pCallbacks->u32Version=%#x\n",
+             u32Version, pCallbacks->u32Version));
+
+    AssertLogRelMsgReturn(u32Version >= VBOX_VERSION,
+                          ("VirtualBox version %#x, expected %#x or higher\n", u32Version, VBOX_VERSION),
+                          VERR_VERSION_MISMATCH);
+    AssertLogRelMsgReturn(pCallbacks->u32Version == PDM_DRVREG_CB_VERSION,
+                          ("callback version %#x, expected %#x\n", pCallbacks->u32Version, PDM_DRVREG_CB_VERSION),
+                          VERR_VERSION_MISMATCH);
+
+    return pCallbacks->pfnRegister(pCallbacks, &g_DrvStorageFilter);
+}
+
diff --git a/src/VBox/Devices/Samples/Makefile.kmk b/src/VBox/Devices/Samples/Makefile.kmk
new file mode 100644
index 00000000..5bf0afd2
--- /dev/null
+++ b/src/VBox/Devices/Samples/Makefile.kmk
@@ -0,0 +1,105 @@
+# $Id: Makefile.kmk $
+## @file
+# Makefile for the device and driver samples.
+#
+
+#
+# Copyright (C) 2009-2019 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.
+#
+
+SUB_DEPTH = ../../../..
+include $(KBUILD_PATH)/subheader.kmk
+
+
+#
+# VBoxSampleDevice - A sample device module.
+#
+DLLS += VBoxSampleDevice
+VBoxSampleDevice_TEMPLATE = VBOXR3
+VBoxSampleDevice_SOURCES  = \
+	VBoxSampleDevice.cpp
+VBoxSampleDevice_LIBS     = \
+	$(LIB_RUNTIME) \
+	$(LIB_VMM)
+
+#
+# VBoxSampleDriver - A sample driver module.
+#
+DLLS += VBoxSampleDriver
+VBoxSampleDriver_TEMPLATE = VBOXR3
+VBoxSampleDriver_SOURCES  = \
+	DrvStorageFilter.cpp
+VBoxSampleDriver_LIBS     = \
+	$(LIB_RUNTIME) \
+	$(LIB_VMM)
+
+
+#
+# VBoxPlaygroundDevice - A device module demonstrating some unusual features.
+#
+DLLS += VBoxPlaygroundDevice
+VBoxPlaygroundDevice_TEMPLATE = VBOXR3
+VBoxPlaygroundDevice_SOURCES  = \
+	DevPlayground.cpp
+VBoxPlaygroundDevice_LIBS     = \
+	$(PATH_STAGE_LIB)/VBoxCOM$(VBOX_SUFF_LIB) \
+	$(LIB_RUNTIME) \
+	$(LIB_VMM)
+
+ifdef VBOX_WITH_XPCOM
+ ## @todo may be worth creating the VBOX_XPCOM SDK def, or just a SDK_VBOXXPCOM.
+ VBoxPlaygroundDevice_DEFS += VBOX_WITH_XPCOM
+ ifdef VBOX_WITH_XPCOM_NAMESPACE_CLEANUP
+  VBoxPlaygroundDevice_DEFS += VBOX_WITH_XPCOM_NAMESPACE_CLEANUP
+ endif
+ VBoxPlaygroundDevice_INCS += \
+	$(VBOX_XPCOM_INCS)
+ VBoxPlaygroundDevice_INTERMEDIATES += \
+	$(VBOX_PATH_SDK)/bindings/xpcom/include/VirtualBox_XPCOM.h
+ VBoxPlaygroundDevice_LIBS += \
+	$(LIB_XPCOM)
+else  # COM
+ VBoxPlaygroundDevice_INCS += \
+	$(VBOX_PATH_SDK)/bindings/mscom/include
+ VBoxPlaygroundDevice_INTERMEDIATES += \
+	$(VBOX_PATH_SDK)/bindings/mscom/include/VirtualBox.h
+endif # COM
+
+
+include $(FILE_KBUILD_SUB_FOOTER)
+
+
+#
+# Installs the filter.
+#
+install-filter:
+	$(if-expr "$(VBOX_MANAGE)" == "",$(error VBOX_MANAGE is not defined,))
+	$(if-expr "$(VBOX_VMNAME)" == "",$(error VBOX_VMNAME is not defined,))
+# Make VBox load the driver
+	$(VBOX_MANAGE) setextradata "$(VBOX_VMNAME)" "VBoxInternal/PDM/Drivers/VBoxSampleDriver/Path" \
+		"$(if $(VBoxSampleDriver_1_INST_TARGET),$(VBoxSampleDriver_1_INST_TARGET),$(VBoxSampleDriver_1_TARGET))"
+# Configure the matching.
+	$(VBOX_MANAGE) setextradata "$(VBOX_VMNAME)" "VBoxInternal/PDM/DriverTransformations/StorageFilter/AboveDriver" \
+		"VD"
+# The config of the injected driver.
+	$(VBOX_MANAGE) setextradata "$(VBOX_VMNAME)" "VBoxInternal/PDM/DriverTransformations/StorageFilter/AttachedDriver/Driver" \
+		"StorageFilter"
+	$(VBOX_MANAGE) setextradata "$(VBOX_VMNAME)" "VBoxInternal/PDM/DriverTransformations/StorageFilter/AttachedDriver/Config/AsyncIOSupported" \
+		"1"
+
+uninstall-filter:
+	$(if-expr "$(VBOX_MANAGE)" == "",$(error VBOX_MANAGE is not defined,))
+	$(if-expr "$(VBOX_VMNAME)" == "",$(error VBOX_VMNAME is not defined,))
+	$(VBOX_MANAGE) showvminfo "$(VBOX_VMNAME)"
+	$(VBOX_MANAGE) setextradata "$(VBOX_VMNAME)" "VBoxInternal/PDM/Drivers/VBoxSampleDriver/Path"
+	$(VBOX_MANAGE) setextradata "$(VBOX_VMNAME)" "VBoxInternal/PDM/DriverTransformations/StorageFilter/AboveDriver"
+	$(VBOX_MANAGE) setextradata "$(VBOX_VMNAME)" "VBoxInternal/PDM/DriverTransformations/StorageFilter/AttachedDriver/Config/AsyncIOSupported"
+
diff --git a/src/VBox/Devices/Samples/VBoxSampleDevice.cpp b/src/VBox/Devices/Samples/VBoxSampleDevice.cpp
new file mode 100644
index 00000000..35dcf70d
--- /dev/null
+++ b/src/VBox/Devices/Samples/VBoxSampleDevice.cpp
@@ -0,0 +1,162 @@
+/* $Id: VBoxSampleDevice.cpp $ */
+/** @file
+ * VBox Sample Device.
+ */
+
+/*
+ * Copyright (C) 2009-2019 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP LOG_GROUP_MISC
+#include <VBox/vmm/pdmdev.h>
+#include <VBox/version.h>
+#include <iprt/errcore.h>
+#include <VBox/log.h>
+
+#include <iprt/assert.h>
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Device Instance Data.
+ */
+typedef struct VBOXSAMPLEDEVICE
+{
+    uint32_t    Whatever;
+} VBOXSAMPLEDEVICE;
+typedef VBOXSAMPLEDEVICE *PVBOXSAMPLEDEVICE;
+
+
+
+static DECLCALLBACK(int) devSampleDestruct(PPDMDEVINS pDevIns)
+{
+    /*
+     * Check the versions here as well since the destructor is *always* called.
+     */
+    PDMDEV_CHECK_VERSIONS_RETURN_QUIET(pDevIns);
+
+    return VINF_SUCCESS;
+}
+
+
+static DECLCALLBACK(int) devSampleConstruct(PPDMDEVINS pDevIns, int iInstance, PCFGMNODE pCfg)
+{
+
+    /*
+     * Check that the device instance and device helper structures are compatible.
+     */
+    PDMDEV_CHECK_VERSIONS_RETURN(pDevIns);
+    NOREF(pCfg);
+
+    /*
+     * Initialize the instance data so that the destructor won't mess up.
+     */
+    PVBOXSAMPLEDEVICE pThis = PDMINS_2_DATA(pDevIns, PVBOXSAMPLEDEVICE);
+    pThis->Whatever = 0;
+
+    /*
+     * Validate and read the configuration.
+     */
+    PDMDEV_VALIDATE_CONFIG_RETURN(pDevIns, "Whatever1|Whatever2", "");
+
+    /*
+     * Use the instance number if necessary (not for this device, which in
+     * g_DeviceSample below declares a maximum instance count of 1).
+     */
+    NOREF(iInstance);
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * The device registration structure.
+ */
+static const PDMDEVREG g_DeviceSample =
+{
+    /* u32Version */
+    PDM_DEVREG_VERSION,
+    /* szName */
+    "sample",
+    /* szRCMod */
+    "",
+    /* szR0Mod */
+    "",
+    /* pszDescription */
+    "VBox Sample Device.",
+    /* fFlags */
+    PDM_DEVREG_FLAGS_DEFAULT_BITS,
+    /* fClass */
+    PDM_DEVREG_CLASS_MISC,
+    /* cMaxInstances */
+    1,
+    /* cbInstance */
+    sizeof(VBOXSAMPLEDEVICE),
+    /* pfnConstruct */
+    devSampleConstruct,
+    /* pfnDestruct */
+    devSampleDestruct,
+    /* pfnRelocate */
+    NULL,
+    /* pfnMemSetup */
+    NULL,
+    /* pfnPowerOn */
+    NULL,
+    /* pfnReset */
+    NULL,
+    /* pfnSuspend */
+    NULL,
+    /* pfnResume */
+    NULL,
+    /* pfnAttach */
+    NULL,
+    /* pfnDetach */
+    NULL,
+    /* pfnQueryInterface */
+    NULL,
+    /* pfnInitComplete */
+    NULL,
+    /* pfnPowerOff */
+    NULL,
+    /* pfnSoftReset */
+    NULL,
+    /* u32VersionEnd */
+    PDM_DEVREG_VERSION
+};
+
+
+/**
+ * Register devices provided by the plugin.
+ *
+ * @returns VBox status code.
+ * @param   pCallbacks      Pointer to the callback table.
+ * @param   u32Version      VBox version number.
+ */
+extern "C" DECLEXPORT(int) VBoxDevicesRegister(PPDMDEVREGCB pCallbacks, uint32_t u32Version)
+{
+    LogFlow(("VBoxSampleDevice::VBoxDevicesRegister: u32Version=%#x pCallbacks->u32Version=%#x\n", u32Version, pCallbacks->u32Version));
+
+    AssertLogRelMsgReturn(u32Version >= VBOX_VERSION,
+                          ("VirtualBox version %#x, expected %#x or higher\n", u32Version, VBOX_VERSION),
+                          VERR_VERSION_MISMATCH);
+    AssertLogRelMsgReturn(pCallbacks->u32Version == PDM_DEVREG_CB_VERSION,
+                          ("callback version %#x, expected %#x\n", pCallbacks->u32Version, PDM_DEVREG_CB_VERSION),
+                          VERR_VERSION_MISMATCH);
+
+    return pCallbacks->pfnRegister(pCallbacks, &g_DeviceSample);
+}
+