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/* $Id: PDMR0Queue.cpp $ */
/** @file
* PDM Queue - Transport data and tasks to EMT and R3, ring-0 code.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP LOG_GROUP_PDM_QUEUE
#include "PDMInternal.h"
#include <VBox/vmm/pdm.h>
#include <VBox/vmm/vmcc.h>
#include <VBox/log.h>
#include <iprt/errcore.h>
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/mem.h>
#include <iprt/memobj.h>
#include <iprt/process.h>
#include <iprt/string.h>
/**
* Creates a ring-0 capable queue.
*
* This is only callable from EMT(0) when the VM is the VMSTATE_CREATING state.
*
* @returns VBox status code.
* @param pGVM The ring-0 VM structure.
* @param pReq The queue create request.
* @thread EMT(0)
*/
VMMR0_INT_DECL(int) PDMR0QueueCreateReqHandler(PGVM pGVM, PPDMQUEUECREATEREQ pReq)
{
/*
* Validate input.
* Note! Restricting to EMT(0) to avoid locking requirements.
*/
int rc = GVMMR0ValidateGVMandEMT(pGVM, 0 /*idCpu*/);
AssertRCReturn(rc, rc);
VM_ASSERT_STATE_RETURN(pGVM, VMSTATE_CREATING, VERR_VM_INVALID_VM_STATE);
AssertPtrReturn(pReq, VERR_INVALID_POINTER);
AssertReturn(pReq->cItems <= PDMQUEUE_MAX_ITEMS, VERR_OUT_OF_RANGE);
AssertReturn(pReq->cItems > 0, VERR_INVALID_PARAMETER);
AssertReturn(pReq->cbItem <= PDMQUEUE_MAX_ITEM_SIZE, VERR_OUT_OF_RANGE);
AssertReturn(pReq->cbItem >= sizeof(PDMQUEUEITEMCORE), VERR_INVALID_PARAMETER);
pReq->cbItem = RT_ALIGN_32(pReq->cbItem, sizeof(uint64_t));
AssertReturn((uint64_t)pReq->cbItem * pReq->cItems <= PDMQUEUE_MAX_TOTAL_SIZE_R0, VERR_OUT_OF_RANGE);
void *pvOwnerR0;
switch ((PDMQUEUETYPE)pReq->enmType)
{
case PDMQUEUETYPE_DEV:
{
AssertReturn(pReq->pvOwner != NIL_RTR3PTR, VERR_INVALID_POINTER);
AssertReturn(!(pReq->pvOwner & HOST_PAGE_OFFSET_MASK), VERR_INVALID_POINTER);
pvOwnerR0 = NULL;
uint32_t i = pGVM->pdmr0.s.cDevInstances;
while (i-- > 0)
{
PPDMDEVINSR0 pDevIns = pGVM->pdmr0.s.apDevInstances[i];
if ( pDevIns
&& RTR0MemObjAddressR3(pDevIns->Internal.s.hMapObj) == pReq->pvOwner)
{
pvOwnerR0 = pDevIns;
break;
}
}
AssertReturn(pvOwnerR0, VERR_NOT_OWNER);
break;
}
case PDMQUEUETYPE_INTERNAL:
AssertReturn(pReq->pvOwner == pGVM->pVMR3, VERR_NOT_OWNER);
pvOwnerR0 = pGVM;
break;
default:
AssertFailedReturn(VERR_INVALID_FUNCTION);
}
AssertReturn(pGVM->pdmr0.s.cQueues < RT_ELEMENTS(pGVM->pdmr0.s.aQueues), VERR_OUT_OF_RESOURCES);
/*
* Calculate the memory needed and allocate it.
*/
uint32_t const cbBitmap = RT_ALIGN_32(RT_ALIGN_32(pReq->cItems, 64 /*uint64_t*/) / 8, 64 /*cache line */);
uint32_t const cbQueue = RT_UOFFSETOF(PDMQUEUE, bmAlloc)
+ cbBitmap
+ pReq->cbItem * pReq->cItems;
RTR0MEMOBJ hMemObj = NIL_RTR0MEMOBJ;
rc = RTR0MemObjAllocPage(&hMemObj, cbQueue, false /*fExecutable*/);
if (RT_SUCCESS(rc))
{
PPDMQUEUE pQueue = (PPDMQUEUE)RTR0MemObjAddress(hMemObj);
/*
* Initialize the queue.
*/
pdmQueueInit(pQueue, cbBitmap, pReq->cbItem, pReq->cItems, pReq->szName,
(PDMQUEUETYPE)pReq->enmType, pReq->pfnCallback, pReq->pvOwner);
/*
* Map it into ring-3.
*/
RTR0MEMOBJ hMapObj = NIL_RTR0MEMOBJ;
rc = RTR0MemObjMapUser(&hMapObj, hMemObj, (RTR3PTR)-1, HOST_PAGE_SIZE,
RTMEM_PROT_READ | RTMEM_PROT_WRITE, RTR0ProcHandleSelf());
if (RT_SUCCESS(rc))
{
/*
* Enter it into the handle tables.
*/
uint32_t iQueue = pGVM->pdmr0.s.cQueues;
if (iQueue < RT_ELEMENTS(pGVM->pdmr0.s.aQueues))
{
pGVM->pdmr0.s.aQueues[iQueue].pQueue = pQueue;
pGVM->pdmr0.s.aQueues[iQueue].hMemObj = hMemObj;
pGVM->pdmr0.s.aQueues[iQueue].hMapObj = hMapObj;
pGVM->pdmr0.s.aQueues[iQueue].pvOwner = pvOwnerR0;
pGVM->pdmr0.s.aQueues[iQueue].cbItem = pReq->cbItem;
pGVM->pdmr0.s.aQueues[iQueue].cItems = pReq->cItems;
pGVM->pdmr0.s.aQueues[iQueue].u32Reserved = UINT32_C(0xf00dface);
pGVM->pdm.s.apRing0Queues[iQueue] = RTR0MemObjAddressR3(hMapObj);
ASMCompilerBarrier(); /* paranoia */
pGVM->pdm.s.cRing0Queues = iQueue + 1;
pGVM->pdmr0.s.cQueues = iQueue + 1;
pReq->hQueue = iQueue;
return VINF_SUCCESS;
}
rc = VERR_OUT_OF_RESOURCES;
RTR0MemObjFree(hMapObj, true /*fFreeMappings*/);
}
RTR0MemObjFree(hMemObj, true /*fFreeMappings*/);
}
return rc;
}
/**
* Called by PDMR0CleanupVM to clean up a queue.
*
* @param pGVM The ring-0 VM structure.
* @param iQueue Index into the ring-0 queue table.
*/
DECLHIDDEN(void) pdmR0QueueDestroy(PGVM pGVM, uint32_t iQueue)
{
AssertReturnVoid(iQueue < RT_ELEMENTS(pGVM->pdmr0.s.aQueues));
PPDMQUEUE pQueue = pGVM->pdmr0.s.aQueues[iQueue].pQueue;
pGVM->pdmr0.s.aQueues[iQueue].pQueue = NULL;
if (RT_VALID_PTR(pQueue))
pQueue->u32Magic = PDMQUEUE_MAGIC_DEAD;
pGVM->pdmr0.s.aQueues[iQueue].pvOwner = NULL;
RTR0MemObjFree(pGVM->pdmr0.s.aQueues[iQueue].hMapObj, true /*fFreeMappings*/);
pGVM->pdmr0.s.aQueues[iQueue].hMapObj = NIL_RTR0MEMOBJ;
RTR0MemObjFree(pGVM->pdmr0.s.aQueues[iQueue].hMemObj, true /*fFreeMappings*/);
pGVM->pdmr0.s.aQueues[iQueue].hMemObj = NIL_RTR0MEMOBJ;
}
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