/* $Id: VirtioCore.cpp $ */ /** @file * VirtioCore - Virtio Core (PCI, feature & config mgt, queue mgt & proxy, notification mgt) */ /* * Copyright (C) 2009-2020 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_DEV_VIRTIO #include #include #include #include #include #include #include #include #include #include #include #include #include #include "VirtioCore.h" /********************************************************************************************************************************* * Defined Constants And Macros * *********************************************************************************************************************************/ #define INSTANCE(a_pVirtio) ((a_pVirtio)->szInstance) #define VIRTQNAME(a_pVirtio, a_uVirtq) ((a_pVirtio)->aVirtqueues[(a_uVirtq)].szName) #define IS_DRIVER_OK(a_pVirtio) ((a_pVirtio)->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK) #define IS_VIRTQ_EMPTY(pDevIns, pVirtio, pVirtq) \ (virtioCoreVirtqAvailBufCount_inline(pDevIns, pVirtio, pVirtq) == 0) /** * This macro returns true if the @a a_offAccess and access length (@a * a_cbAccess) are within the range of the mapped capability struct described by * @a a_LocCapData. * * @param[in] a_offAccess Input: The offset into the MMIO bar of the access. * @param[in] a_cbAccess Input: The access size. * @param[out] a_offsetIntoCap Output: uint32_t variable to return the intra-capability offset into. * @param[in] a_LocCapData Input: The capability location info. */ #define MATCHES_VIRTIO_CAP_STRUCT(a_offAccess, a_cbAccess, a_offsetIntoCap, a_LocCapData) \ ( ((a_offsetIntoCap) = (uint32_t)((a_offAccess) - (a_LocCapData).offMmio)) < (uint32_t)(a_LocCapData).cbMmio \ && (a_offsetIntoCap) + (uint32_t)(a_cbAccess) <= (uint32_t)(a_LocCapData).cbMmio ) /** Marks the start of the virtio saved state (just for sanity). */ #define VIRTIO_SAVEDSTATE_MARKER UINT64_C(0x1133557799bbddff) /** The current saved state version for the virtio core. */ #define VIRTIO_SAVEDSTATE_VERSION UINT32_C(1) /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /** @name virtq related flags * @{ */ #define VIRTQ_DESC_F_NEXT 1 /**< Indicates this descriptor chains to next */ #define VIRTQ_DESC_F_WRITE 2 /**< Marks buffer as write-only (default ro) */ #define VIRTQ_DESC_F_INDIRECT 4 /**< Buffer is list of buffer descriptors */ #define VIRTQ_USED_F_NO_NOTIFY 1 /**< Dev to Drv: Don't notify when buf added */ #define VIRTQ_AVAIL_F_NO_INTERRUPT 1 /**< Drv to Dev: Don't notify when buf eaten */ /** @} */ /** * virtq related structs * (struct names follow VirtIO 1.0 spec, typedef use VBox style) */ typedef struct virtq_desc { uint64_t GCPhysBuf; /**< addr GC Phys. address of buffer */ uint32_t cb; /**< len Buffer length */ uint16_t fFlags; /**< flags Buffer specific flags */ uint16_t uDescIdxNext; /**< next Idx set if VIRTIO_DESC_F_NEXT */ } VIRTQ_DESC_T, *PVIRTQ_DESC_T; typedef struct virtq_avail { uint16_t fFlags; /**< flags avail ring guest-to-host flags */ uint16_t uIdx; /**< idx Index of next free ring slot */ RT_FLEXIBLE_ARRAY_EXTENSION uint16_t auRing[RT_FLEXIBLE_ARRAY]; /**< ring Ring: avail drv to dev bufs */ //uint16_t uUsedEventIdx; /**< used_event (if VIRTQ_USED_F_EVENT_IDX) */ } VIRTQ_AVAIL_T, *PVIRTQ_AVAIL_T; typedef struct virtq_used_elem { uint32_t uDescIdx; /**< idx Start of used desc chain */ uint32_t cbElem; /**< len Total len of used desc chain */ } VIRTQ_USED_ELEM_T; typedef struct virt_used { uint16_t fFlags; /**< flags used ring host-to-guest flags */ uint16_t uIdx; /**< idx Index of next ring slot */ RT_FLEXIBLE_ARRAY_EXTENSION VIRTQ_USED_ELEM_T aRing[RT_FLEXIBLE_ARRAY]; /**< ring Ring: used dev to drv bufs */ //uint16_t uAvailEventIdx; /**< avail_event if (VIRTQ_USED_F_EVENT_IDX) */ } VIRTQ_USED_T, *PVIRTQ_USED_T; const char *virtioCoreGetStateChangeText(VIRTIOVMSTATECHANGED enmState) { switch (enmState) { case kvirtIoVmStateChangedReset: return "VM RESET"; case kvirtIoVmStateChangedSuspend: return "VM SUSPEND"; case kvirtIoVmStateChangedPowerOff: return "VM POWER OFF"; case kvirtIoVmStateChangedResume: return "VM RESUME"; default: return ""; } } /* Internal Functions */ static void virtioCoreNotifyGuestDriver(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, uint16_t uVirtq); static int virtioKick(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, uint8_t uCause, uint16_t uVec); /** @name Internal queue operations * @{ */ /** * Accessor for virtq descriptor */ #ifdef IN_RING3 DECLINLINE(void) virtioReadDesc(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTQUEUE pVirtq, uint32_t idxDesc, PVIRTQ_DESC_T pDesc) { AssertMsg(pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK, ("Called with guest driver not ready\n")); RT_NOREF(pVirtio); uint16_t const cVirtqItems = RT_MAX(pVirtq->uSize, 1); /* Make sure to avoid div-by-zero. */ PDMDevHlpPCIPhysRead(pDevIns, pVirtq->GCPhysVirtqDesc + sizeof(VIRTQ_DESC_T) * (idxDesc % cVirtqItems), pDesc, sizeof(VIRTQ_DESC_T)); } #endif /** * Accessors for virtq avail ring */ #ifdef IN_RING3 DECLINLINE(uint16_t) virtioReadAvailDescIdx(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTQUEUE pVirtq, uint32_t availIdx) { uint16_t uDescIdx; AssertMsg(pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK, ("Called with guest driver not ready\n")); RT_NOREF(pVirtio); uint16_t const cVirtqItems = RT_MAX(pVirtq->uSize, 1); /* Make sure to avoid div-by-zero. */ PDMDevHlpPCIPhysRead(pDevIns, pVirtq->GCPhysVirtqAvail + RT_UOFFSETOF_DYN(VIRTQ_AVAIL_T, auRing[availIdx % cVirtqItems]), &uDescIdx, sizeof(uDescIdx)); return uDescIdx; } DECLINLINE(uint16_t) virtioReadAvailUsedEvent(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTQUEUE pVirtq) { uint16_t uUsedEventIdx; /* VirtIO 1.0 uUsedEventIdx (used_event) immediately follows ring */ AssertMsg(pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK, ("Called with guest driver not ready\n")); RT_NOREF(pVirtio); PDMDevHlpPCIPhysRead(pDevIns, pVirtq->GCPhysVirtqAvail + RT_UOFFSETOF_DYN(VIRTQ_AVAIL_T, auRing[pVirtq->uSize]), &uUsedEventIdx, sizeof(uUsedEventIdx)); return uUsedEventIdx; } #endif DECLINLINE(uint16_t) virtioReadAvailRingIdx(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTQUEUE pVirtq) { uint16_t uIdx = 0; AssertMsg(pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK, ("Called with guest driver not ready\n")); RT_NOREF(pVirtio); PDMDevHlpPCIPhysRead(pDevIns, pVirtq->GCPhysVirtqAvail + RT_UOFFSETOF(VIRTQ_AVAIL_T, uIdx), &uIdx, sizeof(uIdx)); return uIdx; } DECLINLINE(uint16_t) virtioReadAvailRingFlags(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTQUEUE pVirtq) { uint16_t fFlags = 0; AssertMsg(pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK, ("Called with guest driver not ready\n")); RT_NOREF(pVirtio); PDMDevHlpPCIPhysRead(pDevIns, pVirtq->GCPhysVirtqAvail + RT_UOFFSETOF(VIRTQ_AVAIL_T, fFlags), &fFlags, sizeof(fFlags)); return fFlags; } /** @} */ /** @name Accessors for virtq used ring * @{ */ #ifdef IN_RING3 DECLINLINE(void) virtioWriteUsedElem(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTQUEUE pVirtq, uint32_t usedIdx, uint32_t uDescIdx, uint32_t uLen) { VIRTQ_USED_ELEM_T elem = { uDescIdx, uLen }; AssertMsg(pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK, ("Called with guest driver not ready\n")); RT_NOREF(pVirtio); uint16_t const cVirtqItems = RT_MAX(pVirtq->uSize, 1); /* Make sure to avoid div-by-zero. */ PDMDevHlpPCIPhysWrite(pDevIns, pVirtq->GCPhysVirtqUsed + RT_UOFFSETOF_DYN(VIRTQ_USED_T, aRing[usedIdx % cVirtqItems]), &elem, sizeof(elem)); } DECLINLINE(void) virtioWriteUsedRingFlags(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTQUEUE pVirtq, uint16_t fFlags) { AssertMsg(pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK, ("Called with guest driver not ready\n")); RT_NOREF(pVirtio); RT_UNTRUSTED_VALIDATED_FENCE(); /* VirtIO 1.0, Section 3.2.1.4.1 */ PDMDevHlpPCIPhysWrite(pDevIns, pVirtq->GCPhysVirtqUsed + RT_UOFFSETOF(VIRTQ_USED_T, fFlags), &fFlags, sizeof(fFlags)); } #endif DECLINLINE(void) virtioWriteUsedRingIdx(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTQUEUE pVirtq, uint16_t uIdx) { AssertMsg(pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK, ("Called with guest driver not ready\n")); RT_NOREF(pVirtio); PDMDevHlpPCIPhysWrite(pDevIns, pVirtq->GCPhysVirtqUsed + RT_UOFFSETOF(VIRTQ_USED_T, uIdx), &uIdx, sizeof(uIdx)); } #ifdef IN_RING3 DECLINLINE(uint16_t) virtioReadUsedRingIdx(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTQUEUE pVirtq) { uint16_t uIdx = 0; AssertMsg(pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK, ("Called with guest driver not ready\n")); RT_NOREF(pVirtio); PDMDevHlpPCIPhysRead(pDevIns, pVirtq->GCPhysVirtqUsed + RT_UOFFSETOF(VIRTQ_USED_T, uIdx), &uIdx, sizeof(uIdx)); return uIdx; } DECLINLINE(uint16_t) virtioReadUsedRingFlags(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTQUEUE pVirtq) { uint16_t fFlags = 0; AssertMsg(pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK, ("Called with guest driver not ready\n")); RT_NOREF(pVirtio); PDMDevHlpPCIPhysRead(pDevIns, pVirtq->GCPhysVirtqUsed + RT_UOFFSETOF(VIRTQ_USED_T, fFlags), &fFlags, sizeof(fFlags)); return fFlags; } DECLINLINE(void) virtioWriteUsedAvailEvent(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTQUEUE pVirtq, uint32_t uAvailEventIdx) { /** VirtIO 1.0 uAvailEventIdx (avail_event) immediately follows ring */ AssertMsg(pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK, ("Called with guest driver not ready\n")); RT_NOREF(pVirtio); PDMDevHlpPCIPhysWrite(pDevIns, pVirtq->GCPhysVirtqUsed + RT_UOFFSETOF_DYN(VIRTQ_USED_T, aRing[pVirtq->uSize]), &uAvailEventIdx, sizeof(uAvailEventIdx)); } #endif DECLINLINE(uint16_t) virtioCoreVirtqAvailBufCount_inline(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTQUEUE pVirtq) { uint16_t uIdx = virtioReadAvailRingIdx(pDevIns, pVirtio, pVirtq); uint16_t uShadow = pVirtq->uAvailIdxShadow; uint16_t uDelta; if (uIdx < uShadow) uDelta = (uIdx + VIRTQ_MAX_ENTRIES) - uShadow; else uDelta = uIdx - uShadow; LogFunc(("%s has %u %s (idx=%u shadow=%u)\n", pVirtq->szName, uDelta, uDelta == 1 ? "entry" : "entries", uIdx, uShadow)); return uDelta; } /** * Get count of new (e.g. pending) elements in available ring. * * @param pDevIns The device instance. * @param pVirtio Pointer to the shared virtio state. * @param uVirtq Virtq number * * @returns how many entries have been added to ring as a delta of the consumer's * avail index and the queue's guest-side current avail index. */ uint16_t virtioCoreVirtqAvailBufCount(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, uint16_t uVirtq) { AssertMsgReturn(uVirtq < RT_ELEMENTS(pVirtio->aVirtqueues), ("uVirtq out of range"), 0); PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[uVirtq]; if (!IS_DRIVER_OK(pVirtio) || !pVirtq->uEnable) { LogRelFunc(("Driver not ready or queue not enabled\n")); return 0; } return virtioCoreVirtqAvailBufCount_inline(pDevIns, pVirtio, pVirtq); } #ifdef IN_RING3 /** API Function: See header file*/ void virtioCorePrintFeatures(VIRTIOCORE *pVirtio, PCDBGFINFOHLP pHlp) { static struct { uint64_t fFeatureBit; const char *pcszDesc; } const s_aFeatures[] = { { VIRTIO_F_RING_INDIRECT_DESC, " RING_INDIRECT_DESC Driver can use descriptors with VIRTQ_DESC_F_INDIRECT flag set\n" }, { VIRTIO_F_RING_EVENT_IDX, " RING_EVENT_IDX Enables use_event and avail_event fields described in 2.4.7, 2.4.8\n" }, { VIRTIO_F_VERSION_1, " VERSION Used to detect legacy drivers.\n" }, }; #define MAXLINE 80 /* Display as a single buf to prevent interceding log messages */ uint16_t cbBuf = RT_ELEMENTS(s_aFeatures) * 132; char *pszBuf = (char *)RTMemAllocZ(cbBuf); Assert(pszBuf); char *cp = pszBuf; for (unsigned i = 0; i < RT_ELEMENTS(s_aFeatures); ++i) { bool isOffered = RT_BOOL(pVirtio->uDeviceFeatures & s_aFeatures[i].fFeatureBit); bool isNegotiated = RT_BOOL(pVirtio->uDriverFeatures & s_aFeatures[i].fFeatureBit); cp += RTStrPrintf(cp, cbBuf - (cp - pszBuf), " %s %s %s", isOffered ? "+" : "-", isNegotiated ? "x" : " ", s_aFeatures[i].pcszDesc); } if (pHlp) pHlp->pfnPrintf(pHlp, "VirtIO Core Features Configuration\n\n" " Offered Accepted Feature Description\n" " ------- -------- ------- -----------\n" "%s\n", pszBuf); #ifdef LOG_ENABLED else Log3(("VirtIO Core Features Configuration\n\n" " Offered Accepted Feature Description\n" " ------- -------- ------- -----------\n" "%s\n", pszBuf)); #endif RTMemFree(pszBuf); } #endif #ifdef LOG_ENABLED /** API Function: See header file */ void virtioCoreHexDump(uint8_t *pv, uint32_t cb, uint32_t uBase, const char *pszTitle) { #define ADJCURSOR(cb) pszOut += cb; cbRemain -= cb; size_t cbPrint = 0, cbRemain = ((cb / 16) + 1) * 80; char *pszBuf = (char *)RTMemAllocZ(cbRemain), *pszOut = pszBuf; AssertMsgReturnVoid(pszBuf, ("Out of Memory")); if (pszTitle) { cbPrint = RTStrPrintf(pszOut, cbRemain, "%s [%d bytes]:\n", pszTitle, cb); ADJCURSOR(cbPrint); } for (uint32_t row = 0; row < RT_MAX(1, (cb / 16) + 1) && row * 16 < cb; row++) { cbPrint = RTStrPrintf(pszOut, cbRemain, "%04x: ", row * 16 + uBase); /* line address */ ADJCURSOR(cbPrint); for (uint8_t col = 0; col < 16; col++) { uint32_t idx = row * 16 + col; if (idx >= cb) cbPrint = RTStrPrintf(pszOut, cbRemain, "-- %s", (col + 1) % 8 ? "" : " "); else cbPrint = RTStrPrintf(pszOut, cbRemain, "%02x %s", pv[idx], (col + 1) % 8 ? "" : " "); ADJCURSOR(cbPrint); } for (uint32_t idx = row * 16; idx < row * 16 + 16; idx++) { cbPrint = RTStrPrintf(pszOut, cbRemain, "%c", (idx >= cb) ? ' ' : (pv[idx] >= 0x20 && pv[idx] <= 0x7e ? pv[idx] : '.')); ADJCURSOR(cbPrint); } *pszOut++ = '\n'; --cbRemain; } Log(("%s\n", pszBuf)); RTMemFree(pszBuf); RT_NOREF2(uBase, pv); #undef ADJCURSOR } /* API FUnction: See header file */ void virtioCoreGCPhysHexDump(PPDMDEVINS pDevIns, RTGCPHYS GCPhys, uint16_t cb, uint32_t uBase, const char *pszTitle) { #define ADJCURSOR(cb) pszOut += cb; cbRemain -= cb; size_t cbPrint = 0, cbRemain = ((cb / 16) + 1) * 80; char *pszBuf = (char *)RTMemAllocZ(cbRemain), *pszOut = pszBuf; AssertMsgReturnVoid(pszBuf, ("Out of Memory")); if (pszTitle) { cbPrint = RTStrPrintf(pszOut, cbRemain, "%s [%d bytes]:\n", pszTitle, cb); ADJCURSOR(cbPrint); } for (uint16_t row = 0; row < (uint16_t)RT_MAX(1, (cb / 16) + 1) && row * 16 < cb; row++) { uint8_t c; cbPrint = RTStrPrintf(pszOut, cbRemain, "%04x: ", row * 16 + uBase); /* line address */ ADJCURSOR(cbPrint); for (uint8_t col = 0; col < 16; col++) { uint32_t idx = row * 16 + col; PDMDevHlpPCIPhysRead(pDevIns, GCPhys + idx, &c, 1); if (idx >= cb) cbPrint = RTStrPrintf(pszOut, cbRemain, "-- %s", (col + 1) % 8 ? "" : " "); else cbPrint = RTStrPrintf(pszOut, cbRemain, "%02x %s", c, (col + 1) % 8 ? "" : " "); ADJCURSOR(cbPrint); } for (uint16_t idx = row * 16; idx < row * 16 + 16; idx++) { PDMDevHlpPCIPhysRead(pDevIns, GCPhys + idx, &c, 1); cbPrint = RTStrPrintf(pszOut, cbRemain, "%c", (idx >= cb) ? ' ' : (c >= 0x20 && c <= 0x7e ? c : '.')); ADJCURSOR(cbPrint); } *pszOut++ = '\n'; --cbRemain; } Log(("%s\n", pszBuf)); RTMemFree(pszBuf); RT_NOREF(uBase); #undef ADJCURSOR } #endif /* LOG_ENABLED */ /** API function: See header file */ void virtioCoreLogMappedIoValue(const char *pszFunc, const char *pszMember, uint32_t uMemberSize, const void *pv, uint32_t cb, uint32_t uOffset, int fWrite, int fHasIndex, uint32_t idx) { if (!LogIs6Enabled()) return; char szIdx[16]; if (fHasIndex) RTStrPrintf(szIdx, sizeof(szIdx), "[%d]", idx); else szIdx[0] = '\0'; if (cb == 1 || cb == 2 || cb == 4 || cb == 8) { char szDepiction[64]; size_t cchDepiction; if (uOffset != 0 || cb != uMemberSize) /* display bounds if partial member access */ cchDepiction = RTStrPrintf(szDepiction, sizeof(szDepiction), "%s%s[%d:%d]", pszMember, szIdx, uOffset, uOffset + cb - 1); else cchDepiction = RTStrPrintf(szDepiction, sizeof(szDepiction), "%s%s", pszMember, szIdx); /* padding */ if (cchDepiction < 30) szDepiction[cchDepiction++] = ' '; while (cchDepiction < 30) szDepiction[cchDepiction++] = '.'; szDepiction[cchDepiction] = '\0'; RTUINT64U uValue; uValue.u = 0; memcpy(uValue.au8, pv, cb); Log6(("%-23s: Guest %s %s %#0*RX64\n", pszFunc, fWrite ? "wrote" : "read ", szDepiction, 2 + cb * 2, uValue.u)); } else /* odd number or oversized access, ... log inline hex-dump style */ { Log6(("%-23s: Guest %s %s%s[%d:%d]: %.*Rhxs\n", pszFunc, fWrite ? "wrote" : "read ", pszMember, szIdx, uOffset, uOffset + cb, cb, pv)); } RT_NOREF2(fWrite, pszFunc); } /** * Makes the MMIO-mapped Virtio fDeviceStatus registers non-cryptic (buffers to * keep the output clean during multi-threaded activity) */ DECLINLINE(void) virtioCoreFormatDeviceStatus(uint8_t bStatus, char *pszBuf, size_t uSize) { #define ADJCURSOR(len) cp += len; uSize -= len; sep = (char *)" | "; memset(pszBuf, 0, uSize); size_t len; char *cp = pszBuf; char *sep = (char *)""; if (bStatus == 0) { RTStrPrintf(cp, uSize, "RESET"); return; } if (bStatus & VIRTIO_STATUS_ACKNOWLEDGE) { len = RTStrPrintf(cp, uSize, "ACKNOWLEDGE"); ADJCURSOR(len); } if (bStatus & VIRTIO_STATUS_DRIVER) { len = RTStrPrintf(cp, uSize, "%sDRIVER", sep); ADJCURSOR(len); } if (bStatus & VIRTIO_STATUS_FEATURES_OK) { len = RTStrPrintf(cp, uSize, "%sFEATURES_OK", sep); ADJCURSOR(len); } if (bStatus & VIRTIO_STATUS_DRIVER_OK) { len = RTStrPrintf(cp, uSize, "%sDRIVER_OK", sep); ADJCURSOR(len); } if (bStatus & VIRTIO_STATUS_FAILED) { len = RTStrPrintf(cp, uSize, "%sFAILED", sep); ADJCURSOR(len); } if (bStatus & VIRTIO_STATUS_DEVICE_NEEDS_RESET) RTStrPrintf(cp, uSize, "%sNEEDS_RESET", sep); #undef ADJCURSOR } #ifdef IN_RING3 int virtioCoreR3VirtqAttach(PVIRTIOCORE pVirtio, uint16_t uVirtq, const char *pcszName) { LogFunc(("%s\n", pcszName)); PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[uVirtq]; pVirtq->uVirtq = uVirtq; pVirtq->uAvailIdxShadow = 0; pVirtq->uUsedIdxShadow = 0; pVirtq->fUsedRingEvent = false; RTStrCopy(pVirtq->szName, sizeof(pVirtq->szName), pcszName); return VINF_SUCCESS; } /** API Fuunction: See header file */ void virtioCoreR3VirtqInfo(PPDMDEVINS pDevIns, PCDBGFINFOHLP pHlp, const char *pszArgs, int uVirtq) { RT_NOREF(pszArgs); PVIRTIOCORE pVirtio = PDMDEVINS_2_DATA(pDevIns, PVIRTIOCORE); PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[uVirtq]; /** @todo add ability to dump physical contents described by any descriptor (using existing VirtIO core API function) */ // bool fDump = pszArgs && (*pszArgs == 'd' || *pszArgs == 'D'); /* "dump" (avail phys descriptor)" uint16_t uAvailIdx = virtioReadAvailRingIdx(pDevIns, pVirtio, pVirtq); uint16_t uAvailIdxShadow = pVirtq->uAvailIdxShadow; uint16_t uUsedIdx = virtioReadUsedRingIdx(pDevIns, pVirtio, pVirtq); uint16_t uUsedIdxShadow = pVirtq->uUsedIdxShadow; PVIRTQBUF pVirtqBuf = NULL; bool fEmpty = IS_VIRTQ_EMPTY(pDevIns, pVirtio, pVirtq); LogFunc(("%s, empty = %s\n", pVirtq->szName, fEmpty ? "true" : "false")); int cSendSegs = 0, cReturnSegs = 0; if (!fEmpty) { virtioCoreR3VirtqAvailBufPeek(pDevIns, pVirtio, uVirtq, &pVirtqBuf); cSendSegs = pVirtqBuf->pSgPhysSend ? pVirtqBuf->pSgPhysSend->cSegs : 0; cReturnSegs = pVirtqBuf->pSgPhysReturn ? pVirtqBuf->pSgPhysReturn->cSegs : 0; } bool fAvailNoInterrupt = virtioReadAvailRingFlags(pDevIns, pVirtio, pVirtq) & VIRTQ_AVAIL_F_NO_INTERRUPT; bool fUsedNoNotify = virtioReadUsedRingFlags(pDevIns, pVirtio, pVirtq) & VIRTQ_USED_F_NO_NOTIFY; pHlp->pfnPrintf(pHlp, " queue enabled: ........... %s\n", pVirtq->uEnable ? "true" : "false"); pHlp->pfnPrintf(pHlp, " size: .................... %d\n", pVirtq->uSize); pHlp->pfnPrintf(pHlp, " notify offset: ........... %d\n", pVirtq->uNotifyOffset); if (pVirtio->fMsiSupport) pHlp->pfnPrintf(pHlp, " MSIX vector: ....... %4.4x\n", pVirtq->uMsix); pHlp->pfnPrintf(pHlp, "\n"); pHlp->pfnPrintf(pHlp, " avail ring (%d entries):\n", uAvailIdx - uAvailIdxShadow); pHlp->pfnPrintf(pHlp, " index: ................ %d\n", uAvailIdx); pHlp->pfnPrintf(pHlp, " shadow: ............... %d\n", uAvailIdxShadow); pHlp->pfnPrintf(pHlp, " flags: ................ %s\n", fAvailNoInterrupt ? "NO_INTERRUPT" : ""); pHlp->pfnPrintf(pHlp, "\n"); pHlp->pfnPrintf(pHlp, " used ring (%d entries):\n", uUsedIdx - uUsedIdxShadow); pHlp->pfnPrintf(pHlp, " index: ................ %d\n", uUsedIdx); pHlp->pfnPrintf(pHlp, " shadow: ............... %d\n", uUsedIdxShadow); pHlp->pfnPrintf(pHlp, " flags: ................ %s\n", fUsedNoNotify ? "NO_NOTIFY" : ""); pHlp->pfnPrintf(pHlp, "\n"); if (!fEmpty) { pHlp->pfnPrintf(pHlp, " desc chain:\n"); pHlp->pfnPrintf(pHlp, " head idx: ............. %d\n", uUsedIdx); pHlp->pfnPrintf(pHlp, " segs: ................. %d\n", cSendSegs + cReturnSegs); pHlp->pfnPrintf(pHlp, " refCnt ................ %d\n", pVirtqBuf->cRefs); pHlp->pfnPrintf(pHlp, "\n"); pHlp->pfnPrintf(pHlp, " host-to-guest (%d bytes):\n", pVirtqBuf->cbPhysSend); pHlp->pfnPrintf(pHlp, " segs: .............. %d\n", cSendSegs); if (cSendSegs) { pHlp->pfnPrintf(pHlp, " index: ............. %d\n", pVirtqBuf->pSgPhysSend->idxSeg); pHlp->pfnPrintf(pHlp, " unsent ............. %d\n", pVirtqBuf->pSgPhysSend->cbSegLeft); } pHlp->pfnPrintf(pHlp, "\n"); pHlp->pfnPrintf(pHlp, " guest-to-host (%d bytes)\n", pVirtqBuf->cbPhysReturn); pHlp->pfnPrintf(pHlp, " segs: .............. %d\n", cReturnSegs); if (cReturnSegs) { pHlp->pfnPrintf(pHlp, " index: ............. %d\n", pVirtqBuf->pSgPhysReturn->idxSeg); pHlp->pfnPrintf(pHlp, " unsent ............. %d\n", pVirtqBuf->pSgPhysReturn->cbSegLeft); } } else pHlp->pfnPrintf(pHlp, " No desc chains available\n"); pHlp->pfnPrintf(pHlp, "\n"); } /** API Function: See header file */ uint32_t virtioCoreR3VirtqBufRetain(PVIRTQBUF pVirtqBuf) { AssertReturn(pVirtqBuf, UINT32_MAX); AssertReturn(pVirtqBuf->u32Magic == VIRTQBUF_MAGIC, UINT32_MAX); uint32_t cRefs = ASMAtomicIncU32(&pVirtqBuf->cRefs); Assert(cRefs > 1); Assert(cRefs < 16); return cRefs; } /** API Function: See header file */ uint32_t virtioCoreR3VirtqBufRelease(PVIRTIOCORE pVirtio, PVIRTQBUF pVirtqBuf) { if (!pVirtqBuf) return 0; AssertReturn(pVirtqBuf, 0); AssertReturn(pVirtqBuf->u32Magic == VIRTQBUF_MAGIC, 0); uint32_t cRefs = ASMAtomicDecU32(&pVirtqBuf->cRefs); Assert(cRefs < 16); if (cRefs == 0) { pVirtqBuf->u32Magic = ~VIRTQBUF_MAGIC; RTMemFree(pVirtqBuf); STAM_REL_COUNTER_INC(&pVirtio->StatDescChainsFreed); } return cRefs; } /** API Function: See header file */ void virtioCoreNotifyConfigChanged(PVIRTIOCORE pVirtio) { virtioKick(pVirtio->pDevInsR3, pVirtio, VIRTIO_ISR_DEVICE_CONFIG, pVirtio->uMsixConfig); } /** API Function: See header file */ void virtioCoreVirtqEnableNotify(PVIRTIOCORE pVirtio, uint16_t uVirtq, bool fEnable) { Assert(uVirtq < RT_ELEMENTS(pVirtio->aVirtqueues)); PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[uVirtq]; if (pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK) { uint16_t fFlags = virtioReadUsedRingFlags(pVirtio->pDevInsR3, pVirtio, pVirtq); if (fEnable) fFlags &= ~VIRTQ_USED_F_NO_NOTIFY; else fFlags |= VIRTQ_USED_F_NO_NOTIFY; virtioWriteUsedRingFlags(pVirtio->pDevInsR3, pVirtio, pVirtq, fFlags); } } /** API function: See Header file */ void virtioCoreResetAll(PVIRTIOCORE pVirtio) { LogFunc(("\n")); pVirtio->fDeviceStatus |= VIRTIO_STATUS_DEVICE_NEEDS_RESET; if (pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK) { pVirtio->fGenUpdatePending = true; virtioKick(pVirtio->pDevInsR3, pVirtio, VIRTIO_ISR_DEVICE_CONFIG, pVirtio->uMsixConfig); } } /** API function: See Header file */ int virtioCoreR3VirtqAvailBufPeek(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, uint16_t uVirtq, PPVIRTQBUF ppVirtqBuf) { return virtioCoreR3VirtqAvailBufGet(pDevIns, pVirtio, uVirtq, ppVirtqBuf, false); } /** API function: See Header file */ int virtioCoreR3VirtqAvailBufNext(PVIRTIOCORE pVirtio, uint16_t uVirtq) { Assert(uVirtq < RT_ELEMENTS(pVirtio->aVirtqueues)); PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[uVirtq]; AssertMsgReturn(IS_DRIVER_OK(pVirtio) && pVirtq->uEnable, ("Guest driver not in ready state.\n"), VERR_INVALID_STATE); if (IS_VIRTQ_EMPTY(pVirtio->pDevInsR3, pVirtio, pVirtq)) return VERR_NOT_AVAILABLE; Log6Func(("%s avail shadow idx: %u\n", pVirtq->szName, pVirtq->uAvailIdxShadow)); pVirtq->uAvailIdxShadow++; return VINF_SUCCESS; } /** API Function: See header file */ int virtioCoreR3VirtqAvailBufGet(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, uint16_t uVirtq, uint16_t uHeadIdx, PPVIRTQBUF ppVirtqBuf) { AssertReturn(ppVirtqBuf, VERR_INVALID_POINTER); *ppVirtqBuf = NULL; AssertMsgReturn(uVirtq < RT_ELEMENTS(pVirtio->aVirtqueues), ("uVirtq out of range"), VERR_INVALID_PARAMETER); PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[uVirtq]; AssertMsgReturn(IS_DRIVER_OK(pVirtio) && pVirtq->uEnable, ("Guest driver not in ready state.\n"), VERR_INVALID_STATE); uint16_t uDescIdx = uHeadIdx; Log6Func(("%s DESC CHAIN: (head) desc_idx=%u\n", pVirtio->aVirtqueues[uVirtq].szName, uHeadIdx)); /* * Allocate and initialize the descriptor chain structure. */ PVIRTQBUF pVirtqBuf = (PVIRTQBUF)RTMemAllocZ(sizeof(VIRTQBUF_T)); AssertReturn(pVirtqBuf, VERR_NO_MEMORY); pVirtqBuf->u32Magic = VIRTQBUF_MAGIC; pVirtqBuf->cRefs = 1; pVirtqBuf->uHeadIdx = uHeadIdx; pVirtqBuf->uVirtq = uVirtq; *ppVirtqBuf = pVirtqBuf; /* * Gather segments. */ VIRTQ_DESC_T desc; uint32_t cbIn = 0; uint32_t cbOut = 0; uint32_t cSegsIn = 0; uint32_t cSegsOut = 0; PVIRTIOSGSEG paSegsIn = pVirtqBuf->aSegsIn; PVIRTIOSGSEG paSegsOut = pVirtqBuf->aSegsOut; do { PVIRTIOSGSEG pSeg; /* * Malicious guests may go beyond paSegsIn or paSegsOut boundaries by linking * several descriptors into a loop. Since there is no legitimate way to get a sequences of * linked descriptors exceeding the total number of descriptors in the ring (see @bugref{8620}), * the following aborts I/O if breach and employs a simple log throttling algorithm to notify. */ if (cSegsIn + cSegsOut >= VIRTQ_MAX_ENTRIES) { static volatile uint32_t s_cMessages = 0; static volatile uint32_t s_cThreshold = 1; if (ASMAtomicIncU32(&s_cMessages) == ASMAtomicReadU32(&s_cThreshold)) { LogRelMax(64, ("Too many linked descriptors; check if the guest arranges descriptors in a loop.\n")); if (ASMAtomicReadU32(&s_cMessages) != 1) LogRelMax(64, ("(the above error has occured %u times so far)\n", ASMAtomicReadU32(&s_cMessages))); ASMAtomicWriteU32(&s_cThreshold, ASMAtomicReadU32(&s_cThreshold) * 10); } break; } RT_UNTRUSTED_VALIDATED_FENCE(); virtioReadDesc(pDevIns, pVirtio, pVirtq, uDescIdx, &desc); if (desc.fFlags & VIRTQ_DESC_F_WRITE) { Log6Func(("%s IN desc_idx=%u seg=%u addr=%RGp cb=%u\n", pVirtq->szName, uDescIdx, cSegsIn, desc.GCPhysBuf, desc.cb)); cbIn += desc.cb; pSeg = &paSegsIn[cSegsIn++]; } else { Log6Func(("%s OUT desc_idx=%u seg=%u addr=%RGp cb=%u\n", pVirtq->szName, uDescIdx, cSegsOut, desc.GCPhysBuf, desc.cb)); cbOut += desc.cb; pSeg = &paSegsOut[cSegsOut++]; #ifdef DEEP_DEBUG if (LogIs11Enabled()) { virtioCoreGCPhysHexDump(pDevIns, desc.GCPhysBuf, desc.cb, 0, NULL); Log(("\n")); } #endif } pSeg->GCPhys = desc.GCPhysBuf; pSeg->cbSeg = desc.cb; uDescIdx = desc.uDescIdxNext; } while (desc.fFlags & VIRTQ_DESC_F_NEXT); /* * Add segments to the descriptor chain structure. */ if (cSegsIn) { virtioCoreGCPhysChainInit(&pVirtqBuf->SgBufIn, paSegsIn, cSegsIn); pVirtqBuf->pSgPhysReturn = &pVirtqBuf->SgBufIn; pVirtqBuf->cbPhysReturn = cbIn; STAM_REL_COUNTER_ADD(&pVirtio->StatDescChainsSegsIn, cSegsIn); } if (cSegsOut) { virtioCoreGCPhysChainInit(&pVirtqBuf->SgBufOut, paSegsOut, cSegsOut); pVirtqBuf->pSgPhysSend = &pVirtqBuf->SgBufOut; pVirtqBuf->cbPhysSend = cbOut; STAM_REL_COUNTER_ADD(&pVirtio->StatDescChainsSegsOut, cSegsOut); } STAM_REL_COUNTER_INC(&pVirtio->StatDescChainsAllocated); Log6Func(("%s -- segs OUT: %u (%u bytes) IN: %u (%u bytes) --\n", pVirtq->szName, cSegsOut, cbOut, cSegsIn, cbIn)); return VINF_SUCCESS; } /** API function: See Header file */ int virtioCoreR3VirtqAvailBufGet(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, uint16_t uVirtq, PPVIRTQBUF ppVirtqBuf, bool fRemove) { Assert(uVirtq < RT_ELEMENTS(pVirtio->aVirtqueues)); PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[uVirtq]; if (IS_VIRTQ_EMPTY(pDevIns, pVirtio, pVirtq)) return VERR_NOT_AVAILABLE; uint16_t uHeadIdx = virtioReadAvailDescIdx(pDevIns, pVirtio, pVirtq, pVirtq->uAvailIdxShadow); if (pVirtio->uDriverFeatures & VIRTIO_F_EVENT_IDX) virtioWriteUsedAvailEvent(pDevIns,pVirtio, pVirtq, pVirtq->uAvailIdxShadow + 1); if (fRemove) pVirtq->uAvailIdxShadow++; int rc = virtioCoreR3VirtqAvailBufGet(pDevIns, pVirtio, uVirtq, uHeadIdx, ppVirtqBuf); return rc; } /** API function: See Header file */ int virtioCoreR3VirtqUsedBufPut(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, uint16_t uVirtq, PRTSGBUF pSgVirtReturn, PVIRTQBUF pVirtqBuf, bool fFence) { Assert(uVirtq < RT_ELEMENTS(pVirtio->aVirtqueues)); PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[uVirtq]; PVIRTIOSGBUF pSgPhysReturn = pVirtqBuf->pSgPhysReturn; Assert(pVirtqBuf->u32Magic == VIRTQBUF_MAGIC); Assert(pVirtqBuf->cRefs > 0); AssertMsgReturn(IS_DRIVER_OK(pVirtio), ("Guest driver not in ready state.\n"), VERR_INVALID_STATE); Log6Func(("Copying client data to %s, desc chain (head desc_idx %d)\n", VIRTQNAME(pVirtio, uVirtq), virtioReadUsedRingIdx(pDevIns, pVirtio, pVirtq))); /* Copy s/g buf (virtual memory) to guest phys mem (IN direction). */ size_t cbCopy = 0, cbTotal = 0, cbRemain = 0; if (pSgVirtReturn) { size_t cbTarget = virtioCoreGCPhysChainCalcBufSize(pSgPhysReturn); cbRemain = cbTotal = RTSgBufCalcTotalLength(pSgVirtReturn); AssertMsgReturn(cbTarget >= cbRemain, ("No space to write data to phys memory"), VERR_BUFFER_OVERFLOW); virtioCoreGCPhysChainReset(pSgPhysReturn); while (cbRemain) { cbCopy = RT_MIN(pSgVirtReturn->cbSegLeft, pSgPhysReturn->cbSegLeft); Assert(cbCopy > 0); PDMDevHlpPhysWrite(pDevIns, (RTGCPHYS)pSgPhysReturn->GCPhysCur, pSgVirtReturn->pvSegCur, cbCopy); RTSgBufAdvance(pSgVirtReturn, cbCopy); virtioCoreGCPhysChainAdvance(pSgPhysReturn, cbCopy); cbRemain -= cbCopy; } if (fFence) RT_UNTRUSTED_NONVOLATILE_COPY_FENCE(); /* needed? */ Assert(!(cbCopy >> 32)); } /* If this write-ahead crosses threshold where the driver wants to get an event flag it */ if (pVirtio->uDriverFeatures & VIRTIO_F_EVENT_IDX) if (pVirtq->uUsedIdxShadow == virtioReadAvailUsedEvent(pDevIns, pVirtio, pVirtq)) pVirtq->fUsedRingEvent = true; /* * Place used buffer's descriptor in used ring but don't update used ring's slot index. * That will be done with a subsequent client call to virtioCoreVirtqUsedRingSync() */ virtioWriteUsedElem(pDevIns, pVirtio, pVirtq, pVirtq->uUsedIdxShadow++, pVirtqBuf->uHeadIdx, (uint32_t)cbTotal); if (pSgVirtReturn) Log6Func((".... Copied %zu bytes in %d segs to %u byte buffer, residual=%zu\n", cbTotal - cbRemain, pSgVirtReturn->cSegs, pVirtqBuf->cbPhysReturn, pVirtqBuf->cbPhysReturn - cbTotal)); Log6Func(("Write ahead used_idx=%u, %s used_idx=%u\n", pVirtq->uUsedIdxShadow, VIRTQNAME(pVirtio, uVirtq), virtioReadUsedRingIdx(pDevIns, pVirtio, pVirtq))); return VINF_SUCCESS; } #endif /* IN_RING3 */ /** API function: See Header file */ int virtioCoreVirtqUsedRingSync(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, uint16_t uVirtq) { Assert(uVirtq < RT_ELEMENTS(pVirtio->aVirtqueues)); PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[uVirtq]; AssertMsgReturn(IS_DRIVER_OK(pVirtio) && pVirtq->uEnable, ("Guest driver not in ready state.\n"), VERR_INVALID_STATE); Log6Func(("Updating %s used_idx to %u\n", pVirtq->szName, pVirtq->uUsedIdxShadow)); virtioWriteUsedRingIdx(pDevIns, pVirtio, pVirtq, pVirtq->uUsedIdxShadow); virtioCoreNotifyGuestDriver(pDevIns, pVirtio, uVirtq); return VINF_SUCCESS; } /** * This is called from the MMIO callback code when the guest does an MMIO access to the * mapped queue notification capability area corresponding to a particular queue, to notify * the queue handler of available data in the avail ring of the queue (VirtIO 1.0, 4.1.4.4.1) * * @param pDevIns The device instance. * @param pVirtio Pointer to the shared virtio state. * @param uVirtq Virtq to check for guest interrupt handling preference * @param uNotifyIdx Notification index */ static void virtioCoreVirtqNotified(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, uint16_t uVirtq, uint16_t uNotifyIdx) { PVIRTIOCORECC pVirtioCC = PDMDEVINS_2_DATA_CC(pDevIns, PVIRTIOCORECC); /* See VirtIO 1.0, section 4.1.5.2 It implies that uVirtq and uNotifyIdx should match. * Disregarding this notification may cause throughput to stop, however there's no way to know * which was queue was intended for wake-up if the two parameters disagree. */ AssertMsg(uNotifyIdx == uVirtq, ("Guest kicked virtq %d's notify addr w/non-corresponding virtq idx %d\n", uVirtq, uNotifyIdx)); RT_NOREF(uNotifyIdx); AssertReturnVoid(uVirtq < RT_ELEMENTS(pVirtio->aVirtqueues)); PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[uVirtq]; Log6Func(("%s (desc chains: %u)\n", pVirtq->szName, virtioCoreVirtqAvailBufCount_inline(pDevIns, pVirtio, pVirtq))); /* Inform client */ pVirtioCC->pfnVirtqNotified(pDevIns, pVirtio, uVirtq); RT_NOREF2(pVirtio, pVirtq); } /** * Trigger MSI-X or INT# interrupt to notify guest of data added to used ring of * the specified virtq, depending on the interrupt configuration of the device * and depending on negotiated and realtime constraints flagged by the guest driver. * * See VirtIO 1.0 specification (section 2.4.7). * * @param pDevIns The device instance. * @param pVirtio Pointer to the shared virtio state. * @param uVirtq Virtq to check for guest interrupt handling preference */ static void virtioCoreNotifyGuestDriver(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, uint16_t uVirtq) { Assert(uVirtq < RT_ELEMENTS(pVirtio->aVirtqueues)); PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[uVirtq]; if (!IS_DRIVER_OK(pVirtio)) { LogFunc(("Guest driver not in ready state.\n")); return; } if (pVirtio->uDriverFeatures & VIRTIO_F_EVENT_IDX) { if (pVirtq->fUsedRingEvent) { #ifdef IN_RING3 Log6Func(("...kicking guest %s, VIRTIO_F_EVENT_IDX set and threshold (%d) reached\n", pVirtq->szName, (uint16_t)virtioReadAvailUsedEvent(pDevIns, pVirtio, pVirtq))); #endif virtioKick(pDevIns, pVirtio, VIRTIO_ISR_VIRTQ_INTERRUPT, pVirtq->uMsix); pVirtq->fUsedRingEvent = false; return; } #ifdef IN_RING3 Log6Func(("...skip interrupt %s, VIRTIO_F_EVENT_IDX set but threshold (%d) not reached (%d)\n", pVirtq->szName,(uint16_t)virtioReadAvailUsedEvent(pDevIns, pVirtio, pVirtq), pVirtq->uUsedIdxShadow)); #endif } else { /** If guest driver hasn't suppressed interrupts, interrupt */ if (!(virtioReadAvailRingFlags(pDevIns, pVirtio, pVirtq) & VIRTQ_AVAIL_F_NO_INTERRUPT)) { virtioKick(pDevIns, pVirtio, VIRTIO_ISR_VIRTQ_INTERRUPT, pVirtq->uMsix); return; } Log6Func(("...skipping interrupt for %s (guest set VIRTQ_AVAIL_F_NO_INTERRUPT)\n", pVirtq->szName)); } } /** * Raise interrupt or MSI-X * * @param pDevIns The device instance. * @param pVirtio Pointer to the shared virtio state. * @param uCause Interrupt cause bit mask to set in PCI ISR port. * @param uVec MSI-X vector, if enabled */ static int virtioKick(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, uint8_t uCause, uint16_t uMsixtor) { if (uCause == VIRTIO_ISR_VIRTQ_INTERRUPT) Log6Func(("reason: buffer added to 'used' ring.\n")); else if (uCause == VIRTIO_ISR_DEVICE_CONFIG) Log6Func(("reason: device config change\n")); if (!pVirtio->fMsiSupport) { pVirtio->uISR |= uCause; PDMDevHlpPCISetIrq(pDevIns, 0, PDM_IRQ_LEVEL_HIGH); } else if (uMsixtor != VIRTIO_MSI_NO_VECTOR) PDMDevHlpPCISetIrq(pDevIns, uMsixtor, 1); return VINF_SUCCESS; } /** * Lower interrupt (Called when guest reads ISR and when resetting) * * @param pDevIns The device instance. */ static void virtioLowerInterrupt(PPDMDEVINS pDevIns, uint16_t uMsixtor) { PVIRTIOCORE pVirtio = PDMINS_2_DATA(pDevIns, PVIRTIOCORE); if (!pVirtio->fMsiSupport) PDMDevHlpPCISetIrq(pDevIns, 0, PDM_IRQ_LEVEL_LOW); else if (uMsixtor != VIRTIO_MSI_NO_VECTOR) PDMDevHlpPCISetIrq(pDevIns, pVirtio->uMsixConfig, PDM_IRQ_LEVEL_LOW); } #ifdef IN_RING3 static void virtioResetVirtq(PVIRTIOCORE pVirtio, uint16_t uVirtq) { Assert(uVirtq < RT_ELEMENTS(pVirtio->aVirtqueues)); PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[uVirtq]; pVirtq->uAvailIdxShadow = 0; pVirtq->uUsedIdxShadow = 0; pVirtq->uEnable = false; pVirtq->uSize = VIRTQ_MAX_ENTRIES; pVirtq->uNotifyOffset = uVirtq; pVirtq->uMsix = uVirtq + 2; pVirtq->fUsedRingEvent = false; if (!pVirtio->fMsiSupport) /* VirtIO 1.0, 4.1.4.3 and 4.1.5.1.2 */ pVirtq->uMsix = VIRTIO_MSI_NO_VECTOR; virtioLowerInterrupt(pVirtio->pDevInsR3, pVirtq->uMsix); } static void virtioResetDevice(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio) { Log2Func(("\n")); pVirtio->uDeviceFeaturesSelect = 0; pVirtio->uDriverFeaturesSelect = 0; pVirtio->uConfigGeneration = 0; pVirtio->fDeviceStatus = 0; pVirtio->uISR = 0; if (!pVirtio->fMsiSupport) virtioLowerInterrupt(pDevIns, 0); else { virtioLowerInterrupt(pDevIns, pVirtio->uMsixConfig); for (int i = 0; i < VIRTQ_MAX_COUNT; i++) virtioLowerInterrupt(pDevIns, pVirtio->aVirtqueues[i].uMsix); } if (!pVirtio->fMsiSupport) /* VirtIO 1.0, 4.1.4.3 and 4.1.5.1.2 */ pVirtio->uMsixConfig = VIRTIO_MSI_NO_VECTOR; for (uint16_t uVirtq = 0; uVirtq < VIRTQ_MAX_COUNT; uVirtq++) virtioResetVirtq(pVirtio, uVirtq); } /** * Invoked by this implementation when guest driver resets the device. * The driver itself will not until the device has read the status change. */ static void virtioGuestR3WasReset(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTIOCORECC pVirtioCC) { LogFunc(("Guest reset the device\n")); /* Let the client know */ pVirtioCC->pfnStatusChanged(pVirtio, pVirtioCC, 0); virtioResetDevice(pDevIns, pVirtio); } #endif /* IN_RING3 */ /** * Handle accesses to Common Configuration capability * * @returns VBox status code * * @param pDevIns The device instance. * @param pVirtio Pointer to the shared virtio state. * @param pVirtioCC Pointer to the current context virtio state. * @param fWrite Set if write access, clear if read access. * @param uOffsetOfAccess The common configuration capability offset. * @param cb Number of bytes to read or write * @param pv Pointer to location to write to or read from */ static int virtioCommonCfgAccessed(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTIOCORECC pVirtioCC, int fWrite, uint32_t uOffsetOfAccess, unsigned cb, void *pv) { uint16_t uVirtq = pVirtio->uVirtqSelect; int rc = VINF_SUCCESS; uint64_t val; if (VIRTIO_DEV_CONFIG_MATCH_MEMBER(uDeviceFeatures, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) { if (fWrite) /* Guest WRITE pCommonCfg>uDeviceFeatures */ { /* VirtIO 1.0, 4.1.4.3 states device_feature is a (guest) driver readonly field, * yet the linux driver attempts to write/read it back twice */ VIRTIO_DEV_CONFIG_LOG_ACCESS(uDeviceFeatures, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess); LogFunc(("... WARNING: Guest attempted to write readonly virtio_pci_common_cfg.device_feature (ignoring)\n")); return VINF_IOM_MMIO_UNUSED_00; } else /* Guest READ pCommonCfg->uDeviceFeatures */ { switch (pVirtio->uDeviceFeaturesSelect) { case 0: val = pVirtio->uDeviceFeatures & UINT32_C(0xffffffff); memcpy(pv, &val, cb); VIRTIO_DEV_CONFIG_LOG_ACCESS(uDeviceFeatures, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess); break; case 1: val = pVirtio->uDeviceFeatures >> 32; memcpy(pv, &val, cb); VIRTIO_DEV_CONFIG_LOG_ACCESS(uDeviceFeatures, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess + sizeof(uint32_t)); break; default: LogFunc(("Guest read uDeviceFeatures with out of range selector (%#x), returning 0\n", pVirtio->uDeviceFeaturesSelect)); return VINF_IOM_MMIO_UNUSED_00; } } } else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER(uDriverFeatures, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) { if (fWrite) /* Guest WRITE pCommonCfg->udriverFeatures */ { switch (pVirtio->uDriverFeaturesSelect) { case 0: memcpy(&pVirtio->uDriverFeatures, pv, cb); VIRTIO_DEV_CONFIG_LOG_ACCESS(uDriverFeatures, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess); break; case 1: memcpy((char *)&pVirtio->uDriverFeatures + sizeof(uint32_t), pv, cb); VIRTIO_DEV_CONFIG_LOG_ACCESS(uDriverFeatures, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess + sizeof(uint32_t)); break; default: LogFunc(("Guest wrote uDriverFeatures with out of range selector (%#x), returning 0\n", pVirtio->uDriverFeaturesSelect)); return VINF_SUCCESS; } } /* Guest READ pCommonCfg->udriverFeatures */ { switch (pVirtio->uDriverFeaturesSelect) { case 0: val = pVirtio->uDriverFeatures & 0xffffffff; memcpy(pv, &val, cb); VIRTIO_DEV_CONFIG_LOG_ACCESS(uDriverFeatures, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess); break; case 1: val = (pVirtio->uDriverFeatures >> 32) & 0xffffffff; memcpy(pv, &val, cb); VIRTIO_DEV_CONFIG_LOG_ACCESS(uDriverFeatures, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess + 4); break; default: LogFunc(("Guest read uDriverFeatures with out of range selector (%#x), returning 0\n", pVirtio->uDriverFeaturesSelect)); return VINF_IOM_MMIO_UNUSED_00; } } } else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER(uNumVirtqs, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) { if (fWrite) { Log2Func(("Guest attempted to write readonly virtio_pci_common_cfg.num_queues\n")); return VINF_SUCCESS; } *(uint16_t *)pv = VIRTQ_MAX_COUNT; VIRTIO_DEV_CONFIG_LOG_ACCESS(uNumVirtqs, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess); } else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER(fDeviceStatus, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) { if (fWrite) /* Guest WRITE pCommonCfg->fDeviceStatus */ { pVirtio->fDeviceStatus = *(uint8_t *)pv; bool fDeviceReset = pVirtio->fDeviceStatus == 0; if (LogIs7Enabled()) { char szOut[80] = { 0 }; virtioCoreFormatDeviceStatus(pVirtio->fDeviceStatus, szOut, sizeof(szOut)); LogFunc(("Guest wrote fDeviceStatus ................ (%s)\n", szOut)); } bool const fStatusChanged = (pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK) != (pVirtio->uPrevDeviceStatus & VIRTIO_STATUS_DRIVER_OK); if (fDeviceReset || fStatusChanged) { #ifdef IN_RING0 /* Since VirtIO status changes are cumbersome by nature, e.g. not a benchmark priority, * handle the rest in R3 to facilitate logging or whatever dev-specific client needs to do */ Log6Func(("RING0 => RING3 (demote)\n")); return VINF_IOM_R3_MMIO_WRITE; #endif } #ifdef IN_RING3 /* * Notify client only if status actually changed from last time and when we're reset. */ if (fDeviceReset) virtioGuestR3WasReset(pDevIns, pVirtio, pVirtioCC); if (fStatusChanged) pVirtioCC->pfnStatusChanged(pVirtio, pVirtioCC, pVirtio->fDeviceStatus & VIRTIO_STATUS_DRIVER_OK); #endif /* * Save the current status for the next write so we can see what changed. */ pVirtio->uPrevDeviceStatus = pVirtio->fDeviceStatus; } else /* Guest READ pCommonCfg->fDeviceStatus */ { *(uint8_t *)pv = pVirtio->fDeviceStatus; if (LogIs7Enabled()) { char szOut[80] = { 0 }; virtioCoreFormatDeviceStatus(pVirtio->fDeviceStatus, szOut, sizeof(szOut)); LogFunc(("Guest read fDeviceStatus ................ (%s)\n", szOut)); } } } else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER( uMsixConfig, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) VIRTIO_DEV_CONFIG_ACCESS( uMsixConfig, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess, pVirtio); else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER( uDeviceFeaturesSelect, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) VIRTIO_DEV_CONFIG_ACCESS( uDeviceFeaturesSelect, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess, pVirtio); else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER( uDriverFeaturesSelect, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) VIRTIO_DEV_CONFIG_ACCESS( uDriverFeaturesSelect, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess, pVirtio); else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER( uConfigGeneration, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) VIRTIO_DEV_CONFIG_ACCESS( uConfigGeneration, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess, pVirtio); else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER( uVirtqSelect, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) VIRTIO_DEV_CONFIG_ACCESS( uVirtqSelect, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess, pVirtio); else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER( GCPhysVirtqDesc, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) VIRTIO_DEV_CONFIG_ACCESS_INDEXED( GCPhysVirtqDesc, uVirtq, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess, pVirtio->aVirtqueues); else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER( GCPhysVirtqAvail, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) VIRTIO_DEV_CONFIG_ACCESS_INDEXED( GCPhysVirtqAvail, uVirtq, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess, pVirtio->aVirtqueues); else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER( GCPhysVirtqUsed, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) VIRTIO_DEV_CONFIG_ACCESS_INDEXED( GCPhysVirtqUsed, uVirtq, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess, pVirtio->aVirtqueues); else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER( uSize, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) VIRTIO_DEV_CONFIG_ACCESS_INDEXED( uSize, uVirtq, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess, pVirtio->aVirtqueues); else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER( uEnable, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) VIRTIO_DEV_CONFIG_ACCESS_INDEXED( uEnable, uVirtq, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess, pVirtio->aVirtqueues); else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER( uNotifyOffset, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) VIRTIO_DEV_CONFIG_ACCESS_INDEXED( uNotifyOffset, uVirtq, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess, pVirtio->aVirtqueues); else if (VIRTIO_DEV_CONFIG_MATCH_MEMBER( uMsix, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess)) VIRTIO_DEV_CONFIG_ACCESS_INDEXED( uMsix, uVirtq, VIRTIO_PCI_COMMON_CFG_T, uOffsetOfAccess, pVirtio->aVirtqueues); else { Log2Func(("Bad guest %s access to virtio_pci_common_cfg: uOffsetOfAccess=%#x (%d), cb=%d\n", fWrite ? "write" : "read ", uOffsetOfAccess, uOffsetOfAccess, cb)); return fWrite ? VINF_SUCCESS : VINF_IOM_MMIO_UNUSED_00; } #ifndef IN_RING3 RT_NOREF(pDevIns, pVirtioCC); #endif return rc; } /** * @callback_method_impl{FNIOMMMIONEWREAD, * Memory mapped I/O Handler for PCI Capabilities read operations.} * * This MMIO handler specifically supports the VIRTIO_PCI_CAP_PCI_CFG capability defined * in the VirtIO 1.0 specification, section 4.1.4.7, and as such is restricted to reads * of 1, 2 or 4 bytes, only. * */ static DECLCALLBACK(VBOXSTRICTRC) virtioMmioRead(PPDMDEVINS pDevIns, void *pvUser, RTGCPHYS off, void *pv, unsigned cb) { PVIRTIOCORE pVirtio = PDMINS_2_DATA(pDevIns, PVIRTIOCORE); PVIRTIOCORECC pVirtioCC = PDMINS_2_DATA_CC(pDevIns, PVIRTIOCORECC); AssertReturn(cb == 1 || cb == 2 || cb == 4, VERR_INVALID_PARAMETER); Assert(pVirtio == (PVIRTIOCORE)pvUser); RT_NOREF(pvUser); uint32_t uOffset; if (MATCHES_VIRTIO_CAP_STRUCT(off, cb, uOffset, pVirtio->LocDeviceCap)) { #ifdef IN_RING3 /* * Callback to client to manage device-specific configuration. */ VBOXSTRICTRC rcStrict = pVirtioCC->pfnDevCapRead(pDevIns, uOffset, pv, cb); /* * Additionally, anytime any part of the device-specific configuration (which our client maintains) * is READ it needs to be checked to see if it changed since the last time any part was read, in * order to maintain the config generation (see VirtIO 1.0 spec, section 4.1.4.3.1) */ bool fDevSpecificFieldChanged = RT_BOOL(memcmp(pVirtioCC->pbDevSpecificCfg + uOffset, pVirtioCC->pbPrevDevSpecificCfg + uOffset, RT_MIN(cb, pVirtioCC->cbDevSpecificCfg - uOffset))); memcpy(pVirtioCC->pbPrevDevSpecificCfg, pVirtioCC->pbDevSpecificCfg, pVirtioCC->cbDevSpecificCfg); if (pVirtio->fGenUpdatePending || fDevSpecificFieldChanged) { ++pVirtio->uConfigGeneration; Log6Func(("Bumped cfg. generation to %d because %s%s\n", pVirtio->uConfigGeneration, fDevSpecificFieldChanged ? " " : "", pVirtio->fGenUpdatePending ? "" : "")); pVirtio->fGenUpdatePending = false; } virtioLowerInterrupt(pDevIns, 0); return rcStrict; #else return VINF_IOM_R3_MMIO_READ; #endif } if (MATCHES_VIRTIO_CAP_STRUCT(off, cb, uOffset, pVirtio->LocCommonCfgCap)) return virtioCommonCfgAccessed(pDevIns, pVirtio, pVirtioCC, false /* fWrite */, uOffset, cb, pv); if (MATCHES_VIRTIO_CAP_STRUCT(off, cb, uOffset, pVirtio->LocIsrCap) && cb == sizeof(uint8_t)) { *(uint8_t *)pv = pVirtio->uISR; Log6Func(("Read and clear ISR\n")); pVirtio->uISR = 0; /* VirtIO specification requires reads of ISR to clear it */ virtioLowerInterrupt(pDevIns, 0); return VINF_SUCCESS; } ASSERT_GUEST_MSG_FAILED(("Bad read access to mapped capabilities region: off=%RGp cb=%u\n", off, cb)); return VINF_IOM_MMIO_UNUSED_00; } /** * @callback_method_impl{FNIOMMMIONEWREAD, * Memory mapped I/O Handler for PCI Capabilities write operations.} * * This MMIO handler specifically supports the VIRTIO_PCI_CAP_PCI_CFG capability defined * in the VirtIO 1.0 specification, section 4.1.4.7, and as such is restricted to writes * of 1, 2 or 4 bytes, only. */ static DECLCALLBACK(VBOXSTRICTRC) virtioMmioWrite(PPDMDEVINS pDevIns, void *pvUser, RTGCPHYS off, void const *pv, unsigned cb) { PVIRTIOCORE pVirtio = PDMINS_2_DATA(pDevIns, PVIRTIOCORE); PVIRTIOCORECC pVirtioCC = PDMINS_2_DATA_CC(pDevIns, PVIRTIOCORECC); AssertReturn(cb == 1 || cb == 2 || cb == 4, VERR_INVALID_PARAMETER); Assert(pVirtio == (PVIRTIOCORE)pvUser); RT_NOREF(pvUser); uint32_t uOffset; if (MATCHES_VIRTIO_CAP_STRUCT(off, cb, uOffset, pVirtio->LocDeviceCap)) { #ifdef IN_RING3 /* * Foreward this MMIO write access for client to deal with. */ return pVirtioCC->pfnDevCapWrite(pDevIns, uOffset, pv, cb); #else return VINF_IOM_R3_MMIO_WRITE; #endif } if (MATCHES_VIRTIO_CAP_STRUCT(off, cb, uOffset, pVirtio->LocCommonCfgCap)) return virtioCommonCfgAccessed(pDevIns, pVirtio, pVirtioCC, true /* fWrite */, uOffset, cb, (void *)pv); if (MATCHES_VIRTIO_CAP_STRUCT(off, cb, uOffset, pVirtio->LocIsrCap) && cb == sizeof(uint8_t)) { pVirtio->uISR = *(uint8_t *)pv; Log6Func(("Setting uISR = 0x%02x (virtq interrupt: %d, dev confg interrupt: %d)\n", pVirtio->uISR & 0xff, pVirtio->uISR & VIRTIO_ISR_VIRTQ_INTERRUPT, RT_BOOL(pVirtio->uISR & VIRTIO_ISR_DEVICE_CONFIG))); return VINF_SUCCESS; } /* This *should* be guest driver dropping index of a new descriptor in avail ring */ if (MATCHES_VIRTIO_CAP_STRUCT(off, cb, uOffset, pVirtio->LocNotifyCap) && cb == sizeof(uint16_t)) { virtioCoreVirtqNotified(pDevIns, pVirtio, uOffset / VIRTIO_NOTIFY_OFFSET_MULTIPLIER, *(uint16_t *)pv); return VINF_SUCCESS; } ASSERT_GUEST_MSG_FAILED(("Bad write access to mapped capabilities region: off=%RGp pv=%#p{%.*Rhxs} cb=%u\n", off, pv, cb, pv, cb)); return VINF_SUCCESS; } #ifdef IN_RING3 /** * @callback_method_impl{FNPCICONFIGREAD} */ static DECLCALLBACK(VBOXSTRICTRC) virtioR3PciConfigRead(PPDMDEVINS pDevIns, PPDMPCIDEV pPciDev, uint32_t uAddress, unsigned cb, uint32_t *pu32Value) { PVIRTIOCORE pVirtio = PDMINS_2_DATA(pDevIns, PVIRTIOCORE); PVIRTIOCORECC pVirtioCC = PDMINS_2_DATA_CC(pDevIns, PVIRTIOCORECC); RT_NOREF(pPciDev); Log7Func((" pDevIns=%p pPciDev=%p uAddress=%#x%s cb=%u pu32Value=%p\n", pDevIns, pPciDev, uAddress, uAddress < 0x10 ? " " : "", cb, pu32Value)); if (uAddress == pVirtio->uPciCfgDataOff) { /* * VirtIO 1.0 spec section 4.1.4.7 describes a required alternative access capability * whereby the guest driver can specify a bar, offset, and length via the PCI configuration space * (the virtio_pci_cfg_cap capability), and access data items. */ struct virtio_pci_cap *pPciCap = &pVirtioCC->pPciCfgCap->pciCap; uint32_t uLength = pPciCap->uLength; if ( (uLength != 1 && uLength != 2 && uLength != 4) || cb != uLength || pPciCap->uBar != VIRTIO_REGION_PCI_CAP) { ASSERT_GUEST_MSG_FAILED(("Guest read virtio_pci_cfg_cap.pci_cfg_data using mismatching config. Ignoring\n")); *pu32Value = UINT32_MAX; return VINF_SUCCESS; } VBOXSTRICTRC rcStrict = virtioMmioRead(pDevIns, pVirtio, pPciCap->uOffset, pu32Value, cb); Log7Func(("virtio: Guest read virtio_pci_cfg_cap.pci_cfg_data, bar=%d, offset=%d, length=%d, result=%d -> %Rrc\n", pPciCap->uBar, pPciCap->uOffset, uLength, *pu32Value, VBOXSTRICTRC_VAL(rcStrict))); return rcStrict; } return VINF_PDM_PCI_DO_DEFAULT; } /** * @callback_method_impl{FNPCICONFIGWRITE} */ static DECLCALLBACK(VBOXSTRICTRC) virtioR3PciConfigWrite(PPDMDEVINS pDevIns, PPDMPCIDEV pPciDev, uint32_t uAddress, unsigned cb, uint32_t u32Value) { PVIRTIOCORE pVirtio = PDMINS_2_DATA(pDevIns, PVIRTIOCORE); PVIRTIOCORECC pVirtioCC = PDMINS_2_DATA_CC(pDevIns, PVIRTIOCORECC); RT_NOREF(pPciDev); Log7Func(("pDevIns=%p pPciDev=%p uAddress=%#x %scb=%u u32Value=%#x\n", pDevIns, pPciDev, uAddress, uAddress < 0xf ? " " : "", cb, u32Value)); if (uAddress == pVirtio->uPciCfgDataOff) { /* VirtIO 1.0 spec section 4.1.4.7 describes a required alternative access capability * whereby the guest driver can specify a bar, offset, and length via the PCI configuration space * (the virtio_pci_cfg_cap capability), and access data items. */ struct virtio_pci_cap *pPciCap = &pVirtioCC->pPciCfgCap->pciCap; uint32_t uLength = pPciCap->uLength; if ( (uLength != 1 && uLength != 2 && uLength != 4) || cb != uLength || pPciCap->uBar != VIRTIO_REGION_PCI_CAP) { ASSERT_GUEST_MSG_FAILED(("Guest write virtio_pci_cfg_cap.pci_cfg_data using mismatching config. Ignoring\n")); return VINF_SUCCESS; } VBOXSTRICTRC rcStrict = virtioMmioWrite(pDevIns, pVirtio, pPciCap->uOffset, &u32Value, cb); Log2Func(("Guest wrote virtio_pci_cfg_cap.pci_cfg_data, bar=%d, offset=%x, length=%x, value=%d -> %Rrc\n", pPciCap->uBar, pPciCap->uOffset, uLength, u32Value, VBOXSTRICTRC_VAL(rcStrict))); return rcStrict; } return VINF_PDM_PCI_DO_DEFAULT; } /********************************************************************************************************************************* * Saved state. * *********************************************************************************************************************************/ /** * Called from the FNSSMDEVSAVEEXEC function of the device. * * @param pVirtio Pointer to the shared virtio state. * @param pHlp The ring-3 device helpers. * @param pSSM The saved state handle. * @returns VBox status code. */ int virtioCoreR3SaveExec(PVIRTIOCORE pVirtio, PCPDMDEVHLPR3 pHlp, PSSMHANDLE pSSM) { LogFunc(("\n")); pHlp->pfnSSMPutU64(pSSM, VIRTIO_SAVEDSTATE_MARKER); pHlp->pfnSSMPutU32(pSSM, VIRTIO_SAVEDSTATE_VERSION); pHlp->pfnSSMPutBool(pSSM, pVirtio->fGenUpdatePending); pHlp->pfnSSMPutU8( pSSM, pVirtio->fDeviceStatus); pHlp->pfnSSMPutU8( pSSM, pVirtio->uConfigGeneration); pHlp->pfnSSMPutU8( pSSM, pVirtio->uPciCfgDataOff); pHlp->pfnSSMPutU8( pSSM, pVirtio->uISR); pHlp->pfnSSMPutU16( pSSM, pVirtio->uVirtqSelect); pHlp->pfnSSMPutU32( pSSM, pVirtio->uDeviceFeaturesSelect); pHlp->pfnSSMPutU32( pSSM, pVirtio->uDriverFeaturesSelect); pHlp->pfnSSMPutU64( pSSM, pVirtio->uDriverFeatures); for (uint32_t i = 0; i < VIRTQ_MAX_COUNT; i++) { PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[i]; pHlp->pfnSSMPutGCPhys64( pSSM, pVirtq->GCPhysVirtqDesc); pHlp->pfnSSMPutGCPhys64( pSSM, pVirtq->GCPhysVirtqAvail); pHlp->pfnSSMPutGCPhys64( pSSM, pVirtq->GCPhysVirtqUsed); pHlp->pfnSSMPutU16( pSSM, pVirtq->uNotifyOffset); pHlp->pfnSSMPutU16( pSSM, pVirtq->uMsix); pHlp->pfnSSMPutU16( pSSM, pVirtq->uEnable); pHlp->pfnSSMPutU16( pSSM, pVirtq->uSize); pHlp->pfnSSMPutU16( pSSM, pVirtq->uAvailIdxShadow); pHlp->pfnSSMPutU16( pSSM, pVirtq->uUsedIdxShadow); int rc = pHlp->pfnSSMPutMem(pSSM, pVirtq->szName, 32); AssertRCReturn(rc, rc); } return VINF_SUCCESS; } /** * Called from the FNSSMDEVLOADEXEC function of the device. * * @param pVirtio Pointer to the shared virtio state. * @param pHlp The ring-3 device helpers. * @param pSSM The saved state handle. * @returns VBox status code. */ int virtioCoreR3LoadExec(PVIRTIOCORE pVirtio, PCPDMDEVHLPR3 pHlp, PSSMHANDLE pSSM) { LogFunc(("\n")); /* * Check the marker and (embedded) version number. */ uint64_t uMarker = 0; int rc = pHlp->pfnSSMGetU64(pSSM, &uMarker); AssertRCReturn(rc, rc); if (uMarker != VIRTIO_SAVEDSTATE_MARKER) return pHlp->pfnSSMSetLoadError(pSSM, VERR_SSM_DATA_UNIT_FORMAT_CHANGED, RT_SRC_POS, N_("Expected marker value %#RX64 found %#RX64 instead"), VIRTIO_SAVEDSTATE_MARKER, uMarker); uint32_t uVersion = 0; rc = pHlp->pfnSSMGetU32(pSSM, &uVersion); AssertRCReturn(rc, rc); if (uVersion != VIRTIO_SAVEDSTATE_VERSION) return pHlp->pfnSSMSetLoadError(pSSM, VERR_SSM_DATA_UNIT_FORMAT_CHANGED, RT_SRC_POS, N_("Unsupported virtio version: %u"), uVersion); /* * Load the state. */ pHlp->pfnSSMGetBool( pSSM, &pVirtio->fGenUpdatePending); pHlp->pfnSSMGetU8( pSSM, &pVirtio->fDeviceStatus); pHlp->pfnSSMGetU8( pSSM, &pVirtio->uConfigGeneration); pHlp->pfnSSMGetU8( pSSM, &pVirtio->uPciCfgDataOff); pHlp->pfnSSMGetU8( pSSM, &pVirtio->uISR); pHlp->pfnSSMGetU16( pSSM, &pVirtio->uVirtqSelect); pHlp->pfnSSMGetU32( pSSM, &pVirtio->uDeviceFeaturesSelect); pHlp->pfnSSMGetU32( pSSM, &pVirtio->uDriverFeaturesSelect); pHlp->pfnSSMGetU64( pSSM, &pVirtio->uDriverFeatures); for (uint32_t i = 0; i < VIRTQ_MAX_COUNT; i++) { PVIRTQUEUE pVirtq = &pVirtio->aVirtqueues[i]; pHlp->pfnSSMGetGCPhys64( pSSM, &pVirtq->GCPhysVirtqDesc); pHlp->pfnSSMGetGCPhys64( pSSM, &pVirtq->GCPhysVirtqAvail); pHlp->pfnSSMGetGCPhys64( pSSM, &pVirtq->GCPhysVirtqUsed); pHlp->pfnSSMGetU16( pSSM, &pVirtq->uNotifyOffset); pHlp->pfnSSMGetU16( pSSM, &pVirtq->uMsix); pHlp->pfnSSMGetU16( pSSM, &pVirtq->uEnable); pHlp->pfnSSMGetU16( pSSM, &pVirtq->uSize); pHlp->pfnSSMGetU16( pSSM, &pVirtq->uAvailIdxShadow); pHlp->pfnSSMGetU16( pSSM, &pVirtq->uUsedIdxShadow); rc = pHlp->pfnSSMGetMem( pSSM, pVirtq->szName, sizeof(pVirtq->szName)); AssertRCReturn(rc, rc); } return VINF_SUCCESS; } /********************************************************************************************************************************* * Device Level * *********************************************************************************************************************************/ /** * This must be called by the client to handle VM state changes * after the client takes care of its device-specific tasks for the state change. * (i.e. Reset, suspend, power-off, resume) * * @param pDevIns The device instance. * @param pVirtio Pointer to the shared virtio state. */ void virtioCoreR3VmStateChanged(PVIRTIOCORE pVirtio, VIRTIOVMSTATECHANGED enmState) { LogFunc(("State changing to %s\n", virtioCoreGetStateChangeText(enmState))); switch(enmState) { case kvirtIoVmStateChangedReset: virtioCoreResetAll(pVirtio); break; case kvirtIoVmStateChangedSuspend: break; case kvirtIoVmStateChangedPowerOff: break; case kvirtIoVmStateChangedResume: for (int uVirtq = 0; uVirtq < VIRTQ_MAX_COUNT; uVirtq++) { if (pVirtio->aVirtqueues[uVirtq].uEnable) virtioCoreNotifyGuestDriver(pVirtio->pDevInsR3, pVirtio, uVirtq); } break; default: LogRelFunc(("Bad enum value")); return; } } /** * This should be called from PDMDEVREGR3::pfnDestruct. * * @param pDevIns The device instance. * @param pVirtio Pointer to the shared virtio state. * @param pVirtioCC Pointer to the ring-3 virtio state. */ void virtioCoreR3Term(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTIOCORECC pVirtioCC) { if (pVirtioCC->pbPrevDevSpecificCfg) { RTMemFree(pVirtioCC->pbPrevDevSpecificCfg); pVirtioCC->pbPrevDevSpecificCfg = NULL; } RT_NOREF(pDevIns, pVirtio); } /** API Function: See header file */ int virtioCoreR3Init(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio, PVIRTIOCORECC pVirtioCC, PVIRTIOPCIPARAMS pPciParams, const char *pcszInstance, uint64_t fDevSpecificFeatures, void *pvDevSpecificCfg, uint16_t cbDevSpecificCfg) { /* * The pVirtio state must be the first member of the shared device instance * data, otherwise we cannot get our bearings in the PCI configuration callbacks. */ AssertLogRelReturn(pVirtio == PDMINS_2_DATA(pDevIns, PVIRTIOCORE), VERR_STATE_CHANGED); AssertLogRelReturn(pVirtioCC == PDMINS_2_DATA_CC(pDevIns, PVIRTIOCORECC), VERR_STATE_CHANGED); pVirtio->pDevInsR3 = pDevIns; /* * Caller must initialize these. */ AssertReturn(pVirtioCC->pfnStatusChanged, VERR_INVALID_POINTER); AssertReturn(pVirtioCC->pfnVirtqNotified, VERR_INVALID_POINTER); #if 0 /* Until pdmR3DvHlp_PCISetIrq() impl is fixed and Assert that limits vec to 0 is removed */ # ifdef VBOX_WITH_MSI_DEVICES pVirtio->fMsiSupport = true; # endif #endif /* * The host features offered include both device-specific features * and reserved feature bits (device independent) */ pVirtio->uDeviceFeatures = VIRTIO_F_VERSION_1 | VIRTIO_DEV_INDEPENDENT_FEATURES_OFFERED | fDevSpecificFeatures; RTStrCopy(pVirtio->szInstance, sizeof(pVirtio->szInstance), pcszInstance); pVirtio->fDeviceStatus = 0; pVirtioCC->cbDevSpecificCfg = cbDevSpecificCfg; pVirtioCC->pbDevSpecificCfg = (uint8_t *)pvDevSpecificCfg; pVirtioCC->pbPrevDevSpecificCfg = (uint8_t *)RTMemDup(pvDevSpecificCfg, cbDevSpecificCfg); AssertLogRelReturn(pVirtioCC->pbPrevDevSpecificCfg, VERR_NO_MEMORY); /* Set PCI config registers (assume 32-bit mode) */ PPDMPCIDEV pPciDev = pDevIns->apPciDevs[0]; PDMPCIDEV_ASSERT_VALID(pDevIns, pPciDev); PDMPciDevSetRevisionId(pPciDev, DEVICE_PCI_REVISION_ID_VIRTIO); PDMPciDevSetVendorId(pPciDev, DEVICE_PCI_VENDOR_ID_VIRTIO); PDMPciDevSetSubSystemVendorId(pPciDev, DEVICE_PCI_VENDOR_ID_VIRTIO); PDMPciDevSetDeviceId(pPciDev, pPciParams->uDeviceId); PDMPciDevSetClassBase(pPciDev, pPciParams->uClassBase); PDMPciDevSetClassSub(pPciDev, pPciParams->uClassSub); PDMPciDevSetClassProg(pPciDev, pPciParams->uClassProg); PDMPciDevSetSubSystemId(pPciDev, pPciParams->uSubsystemId); PDMPciDevSetInterruptLine(pPciDev, pPciParams->uInterruptLine); PDMPciDevSetInterruptPin(pPciDev, pPciParams->uInterruptPin); /* Register PCI device */ int rc = PDMDevHlpPCIRegister(pDevIns, pPciDev); if (RT_FAILURE(rc)) return PDMDEV_SET_ERROR(pDevIns, rc, N_("virtio: cannot register PCI Device")); /* can we put params in this error? */ rc = PDMDevHlpPCIInterceptConfigAccesses(pDevIns, pPciDev, virtioR3PciConfigRead, virtioR3PciConfigWrite); AssertRCReturn(rc, rc); /* Construct & map PCI vendor-specific capabilities for virtio host negotiation with guest driver */ #define CFG_ADDR_2_IDX(addr) ((uint8_t)(((uintptr_t)(addr) - (uintptr_t)&pPciDev->abConfig[0]))) #define SET_PCI_CAP_LOC(a_pPciDev, a_pCfg, a_LocCap, a_uMmioLengthAlign) \ do { \ (a_LocCap).offMmio = (a_pCfg)->uOffset; \ (a_LocCap).cbMmio = RT_ALIGN_T((a_pCfg)->uLength, a_uMmioLengthAlign, uint16_t); \ (a_LocCap).offPci = (uint16_t)(uintptr_t)((uint8_t *)(a_pCfg) - &(a_pPciDev)->abConfig[0]); \ (a_LocCap).cbPci = (a_pCfg)->uCapLen; \ } while (0) PVIRTIO_PCI_CAP_T pCfg; uint32_t cbRegion = 0; /* Common capability (VirtIO 1.0 spec, section 4.1.4.3) */ pCfg = (PVIRTIO_PCI_CAP_T)&pPciDev->abConfig[0x40]; pCfg->uCfgType = VIRTIO_PCI_CAP_COMMON_CFG; pCfg->uCapVndr = VIRTIO_PCI_CAP_ID_VENDOR; pCfg->uCapLen = sizeof(VIRTIO_PCI_CAP_T); pCfg->uCapNext = CFG_ADDR_2_IDX(pCfg) + pCfg->uCapLen; pCfg->uBar = VIRTIO_REGION_PCI_CAP; pCfg->uOffset = RT_ALIGN_32(0, 4); /* Currently 0, but reminder to 32-bit align if changing this */ pCfg->uLength = sizeof(VIRTIO_PCI_COMMON_CFG_T); cbRegion += pCfg->uLength; SET_PCI_CAP_LOC(pPciDev, pCfg, pVirtio->LocCommonCfgCap, 2); pVirtioCC->pCommonCfgCap = pCfg; /* * Notify capability (VirtIO 1.0 spec, section 4.1.4.4). Note: uLength is based on the choice * of this implementation to make each queue's uNotifyOffset equal to (VirtqSelect) ordinal * value of the queue (different strategies are possible according to spec). */ pCfg = (PVIRTIO_PCI_CAP_T)&pPciDev->abConfig[pCfg->uCapNext]; pCfg->uCfgType = VIRTIO_PCI_CAP_NOTIFY_CFG; pCfg->uCapVndr = VIRTIO_PCI_CAP_ID_VENDOR; pCfg->uCapLen = sizeof(VIRTIO_PCI_NOTIFY_CAP_T); pCfg->uCapNext = CFG_ADDR_2_IDX(pCfg) + pCfg->uCapLen; pCfg->uBar = VIRTIO_REGION_PCI_CAP; pCfg->uOffset = pVirtioCC->pCommonCfgCap->uOffset + pVirtioCC->pCommonCfgCap->uLength; pCfg->uOffset = RT_ALIGN_32(pCfg->uOffset, 4); pCfg->uLength = VIRTQ_MAX_COUNT * VIRTIO_NOTIFY_OFFSET_MULTIPLIER + 2; /* will change in VirtIO 1.1 */ cbRegion += pCfg->uLength; SET_PCI_CAP_LOC(pPciDev, pCfg, pVirtio->LocNotifyCap, 1); pVirtioCC->pNotifyCap = (PVIRTIO_PCI_NOTIFY_CAP_T)pCfg; pVirtioCC->pNotifyCap->uNotifyOffMultiplier = VIRTIO_NOTIFY_OFFSET_MULTIPLIER; /* ISR capability (VirtIO 1.0 spec, section 4.1.4.5) * * VirtIO 1.0 spec says 8-bit, unaligned in MMIO space. Example/diagram * of spec shows it as a 32-bit field with upper bits 'reserved' * Will take spec's words more literally than the diagram for now. */ pCfg = (PVIRTIO_PCI_CAP_T)&pPciDev->abConfig[pCfg->uCapNext]; pCfg->uCfgType = VIRTIO_PCI_CAP_ISR_CFG; pCfg->uCapVndr = VIRTIO_PCI_CAP_ID_VENDOR; pCfg->uCapLen = sizeof(VIRTIO_PCI_CAP_T); pCfg->uCapNext = CFG_ADDR_2_IDX(pCfg) + pCfg->uCapLen; pCfg->uBar = VIRTIO_REGION_PCI_CAP; pCfg->uOffset = pVirtioCC->pNotifyCap->pciCap.uOffset + pVirtioCC->pNotifyCap->pciCap.uLength; pCfg->uOffset = RT_ALIGN_32(pCfg->uOffset, 4); pCfg->uLength = sizeof(uint8_t); cbRegion += pCfg->uLength; SET_PCI_CAP_LOC(pPciDev, pCfg, pVirtio->LocIsrCap, 4); pVirtioCC->pIsrCap = pCfg; /* PCI Cfg capability (VirtIO 1.0 spec, section 4.1.4.7) * This capability doesn't get page-MMIO mapped. Instead uBar, uOffset and uLength are intercepted * by trapping PCI configuration I/O and get modulated by consumers to locate fetch and read/write * values from any region. NOTE: The linux driver not only doesn't use this feature, it will not * even list it as present if uLength isn't non-zero and also 4-byte-aligned as the linux driver is * initializing. */ pVirtio->uPciCfgDataOff = pCfg->uCapNext + RT_OFFSETOF(VIRTIO_PCI_CFG_CAP_T, uPciCfgData); pCfg = (PVIRTIO_PCI_CAP_T)&pPciDev->abConfig[pCfg->uCapNext]; pCfg->uCfgType = VIRTIO_PCI_CAP_PCI_CFG; pCfg->uCapVndr = VIRTIO_PCI_CAP_ID_VENDOR; pCfg->uCapLen = sizeof(VIRTIO_PCI_CFG_CAP_T); pCfg->uCapNext = (pVirtio->fMsiSupport || pVirtioCC->pbDevSpecificCfg) ? CFG_ADDR_2_IDX(pCfg) + pCfg->uCapLen : 0; pCfg->uBar = 0; pCfg->uOffset = 0; pCfg->uLength = 0; cbRegion += pCfg->uLength; SET_PCI_CAP_LOC(pPciDev, pCfg, pVirtio->LocPciCfgCap, 1); pVirtioCC->pPciCfgCap = (PVIRTIO_PCI_CFG_CAP_T)pCfg; if (pVirtioCC->pbDevSpecificCfg) { /* Device specific config capability (via VirtIO 1.0, section 4.1.4.6). * Client defines the device-specific config struct and passes size to virtioCoreR3Init() * to inform this. */ pCfg = (PVIRTIO_PCI_CAP_T)&pPciDev->abConfig[pCfg->uCapNext]; pCfg->uCfgType = VIRTIO_PCI_CAP_DEVICE_CFG; pCfg->uCapVndr = VIRTIO_PCI_CAP_ID_VENDOR; pCfg->uCapLen = sizeof(VIRTIO_PCI_CAP_T); pCfg->uCapNext = pVirtio->fMsiSupport ? CFG_ADDR_2_IDX(pCfg) + pCfg->uCapLen : 0; pCfg->uBar = VIRTIO_REGION_PCI_CAP; pCfg->uOffset = pVirtioCC->pIsrCap->uOffset + pVirtioCC->pIsrCap->uLength; pCfg->uOffset = RT_ALIGN_32(pCfg->uOffset, 4); pCfg->uLength = cbDevSpecificCfg; cbRegion += pCfg->uLength; SET_PCI_CAP_LOC(pPciDev, pCfg, pVirtio->LocDeviceCap, 4); pVirtioCC->pDeviceCap = pCfg; } else Assert(pVirtio->LocDeviceCap.cbMmio == 0 && pVirtio->LocDeviceCap.cbPci == 0); if (pVirtio->fMsiSupport) { PDMMSIREG aMsiReg; RT_ZERO(aMsiReg); aMsiReg.iMsixCapOffset = pCfg->uCapNext; aMsiReg.iMsixNextOffset = 0; aMsiReg.iMsixBar = VIRTIO_REGION_MSIX_CAP; aMsiReg.cMsixVectors = VBOX_MSIX_MAX_ENTRIES; rc = PDMDevHlpPCIRegisterMsi(pDevIns, &aMsiReg); /* see MsixR3init() */ if (RT_FAILURE(rc)) { /* See PDMDevHlp.cpp:pdmR3DevHlp_PCIRegisterMsi */ LogFunc(("Failed to configure MSI-X (%Rrc). Reverting to INTx\n", rc)); pVirtio->fMsiSupport = false; } else Log2Func(("Using MSI-X for guest driver notification\n")); } else LogFunc(("MSI-X not available for VBox, using INTx notification\n")); /* Set offset to first capability and enable PCI dev capabilities */ PDMPciDevSetCapabilityList(pPciDev, 0x40); PDMPciDevSetStatus(pPciDev, VBOX_PCI_STATUS_CAP_LIST); size_t cbSize = RTStrPrintf(pVirtioCC->pcszMmioName, sizeof(pVirtioCC->pcszMmioName), "%s MMIO", pcszInstance); if (cbSize <= 0) return PDMDEV_SET_ERROR(pDevIns, rc, N_("virtio: out of memory allocating string")); /* can we put params in this error? */ /* Note: The Linux driver at drivers/virtio/virtio_pci_modern.c tries to map at least a page for the * 'unknown' device-specific capability without querying the capability to figure * out size, so pad with an extra page */ rc = PDMDevHlpPCIIORegionCreateMmio(pDevIns, VIRTIO_REGION_PCI_CAP, RT_ALIGN_32(cbRegion + PAGE_SIZE, PAGE_SIZE), PCI_ADDRESS_SPACE_MEM, virtioMmioWrite, virtioMmioRead, pVirtio, IOMMMIO_FLAGS_READ_PASSTHRU | IOMMMIO_FLAGS_WRITE_PASSTHRU, pVirtioCC->pcszMmioName, &pVirtio->hMmioPciCap); AssertLogRelRCReturn(rc, PDMDEV_SET_ERROR(pDevIns, rc, N_("virtio: cannot register PCI Capabilities address space"))); /* * Statistics. */ PDMDevHlpSTAMRegisterF(pDevIns, &pVirtio->StatDescChainsAllocated, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS, STAMUNIT_COUNT, "Total number of allocated descriptor chains", "DescChainsAllocated"); PDMDevHlpSTAMRegisterF(pDevIns, &pVirtio->StatDescChainsFreed, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS, STAMUNIT_COUNT, "Total number of freed descriptor chains", "DescChainsFreed"); PDMDevHlpSTAMRegisterF(pDevIns, &pVirtio->StatDescChainsSegsIn, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS, STAMUNIT_COUNT, "Total number of inbound segments", "DescChainsSegsIn"); PDMDevHlpSTAMRegisterF(pDevIns, &pVirtio->StatDescChainsSegsOut, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS, STAMUNIT_COUNT, "Total number of outbound segments", "DescChainsSegsOut"); return VINF_SUCCESS; } #else /* !IN_RING3 */ /** * Sets up the core ring-0/raw-mode virtio bits. * * @returns VBox status code. * @param pDevIns The device instance. * @param pVirtio Pointer to the shared virtio state. This must be the first * member in the shared device instance data! */ int virtioCoreRZInit(PPDMDEVINS pDevIns, PVIRTIOCORE pVirtio) { AssertLogRelReturn(pVirtio == PDMINS_2_DATA(pDevIns, PVIRTIOCORE), VERR_STATE_CHANGED); #ifdef FUTURE_OPTIMIZATION int rc = PDMDevHlpSetDeviceCritSect(pDevIns, PDMDevHlpCritSectGetNop(pDevIns)); AssertRCReturn(rc, rc); #endif int rc = PDMDevHlpMmioSetUpContext(pDevIns, pVirtio->hMmioPciCap, virtioMmioWrite, virtioMmioRead, pVirtio); AssertRCReturn(rc, rc); return rc; } #endif /* !IN_RING3 */