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/* $Id: TMR0.cpp $ */
/** @file
* TM - Timeout Manager, host ring-0 context.
*/
/*
* Copyright (C) 2021-2023 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_TM
#include <VBox/vmm/tm.h>
#include "TMInternal.h"
#include <VBox/vmm/gvm.h>
#include <VBox/err.h>
#include <VBox/log.h>
#include <VBox/param.h>
#include <iprt/assert.h>
#include <iprt/mem.h>
#include <iprt/memobj.h>
#include <iprt/process.h>
#include <iprt/string.h>
/**
* Initializes the per-VM data for the TM.
*
* This is called from under the GVMM lock, so it should only initialize the
* data so TMR0CleanupVM and others will work smoothly.
*
* @param pGVM Pointer to the global VM structure.
*/
VMMR0_INT_DECL(void) TMR0InitPerVMData(PGVM pGVM)
{
AssertCompile(sizeof(pGVM->tmr0.padding) >= sizeof(pGVM->tmr0.s));
for (uint32_t idxQueue = 0; idxQueue < RT_ELEMENTS(pGVM->tmr0.s.aTimerQueues); idxQueue++)
{
pGVM->tmr0.s.aTimerQueues[idxQueue].hMemObj = NIL_RTR0MEMOBJ;
pGVM->tmr0.s.aTimerQueues[idxQueue].hMapObj = NIL_RTR0MEMOBJ;
}
pGVM->tmr0.s.VirtualGetRawData.pu64Prev = &pGVM->tm.s.u64VirtualRawPrev;
pGVM->tmr0.s.VirtualGetRawData.pfnBad = tmVirtualNanoTSBad;
pGVM->tmr0.s.VirtualGetRawData.pfnBadCpuIndex = tmVirtualNanoTSBadCpuIndex;
pGVM->tmr0.s.VirtualGetRawData.pfnRediscover = tmVirtualNanoTSRediscover;
pGVM->tmr0.s.pfnVirtualGetRaw = tmVirtualNanoTSRediscover;
}
/**
* Cleans up any loose ends before the GVM structure is destroyed.
*/
VMMR0_INT_DECL(void) TMR0CleanupVM(PGVM pGVM)
{
for (uint32_t idxQueue = 0; idxQueue < RT_ELEMENTS(pGVM->tmr0.s.aTimerQueues); idxQueue++)
{
if (pGVM->tmr0.s.aTimerQueues[idxQueue].hMapObj == NIL_RTR0MEMOBJ)
{
RTR0MemObjFree(pGVM->tmr0.s.aTimerQueues[idxQueue].hMapObj, true /*fFreeMappings*/);
pGVM->tmr0.s.aTimerQueues[idxQueue].hMapObj = NIL_RTR0MEMOBJ;
}
if (pGVM->tmr0.s.aTimerQueues[idxQueue].hMemObj != NIL_RTR0MEMOBJ)
{
RTR0MemObjFree(pGVM->tmr0.s.aTimerQueues[idxQueue].hMemObj, true /*fFreeMappings*/);
pGVM->tmr0.s.aTimerQueues[idxQueue].hMemObj = NIL_RTR0MEMOBJ;
}
}
}
/**
* Grows the timer array for @a idxQueue to at least @a cMinTimers entries.
*
* @returns VBox status code.
* @param pGVM The ring-0 VM structure.
* @param idxQueue The index of the queue to grow.
* @param cMinTimers The minimum growth target.
* @thread EMT
* @note Caller must own the queue lock exclusively.
*/
VMMR0_INT_DECL(int) TMR0TimerQueueGrow(PGVM pGVM, uint32_t idxQueue, uint32_t cMinTimers)
{
/*
* Validate input and state.
*/
VM_ASSERT_EMT0_RETURN(pGVM, VERR_VM_THREAD_NOT_EMT);
VM_ASSERT_STATE_RETURN(pGVM, VMSTATE_CREATING, VERR_VM_INVALID_VM_STATE); /** @todo must do better than this! */
AssertReturn(idxQueue <= RT_ELEMENTS(pGVM->tmr0.s.aTimerQueues), VERR_TM_INVALID_TIMER_QUEUE);
AssertCompile(RT_ELEMENTS(pGVM->tmr0.s.aTimerQueues) == RT_ELEMENTS(pGVM->tm.s.aTimerQueues));
PTMTIMERQUEUER0 pQueueR0 = &pGVM->tmr0.s.aTimerQueues[idxQueue];
PTMTIMERQUEUE pQueueShared = &pGVM->tm.s.aTimerQueues[idxQueue];
AssertMsgReturn(PDMCritSectRwIsWriteOwner(pGVM, &pQueueShared->AllocLock),
("queue=%s %.*Rhxs\n", pQueueShared->szName, sizeof(pQueueShared->AllocLock), &pQueueShared->AllocLock),
VERR_NOT_OWNER);
uint32_t cNewTimers = cMinTimers;
AssertReturn(cNewTimers <= _32K, VERR_TM_TOO_MANY_TIMERS);
uint32_t const cOldTimers = pQueueR0->cTimersAlloc;
ASMCompilerBarrier();
AssertReturn(cNewTimers >= cOldTimers, VERR_TM_IPE_1);
AssertReturn(cOldTimers == pQueueShared->cTimersAlloc, VERR_TM_IPE_2);
/*
* Round up the request to the nearest page and do the allocation.
*/
size_t cbNew = sizeof(TMTIMER) * cNewTimers;
cbNew = RT_ALIGN_Z(cbNew, HOST_PAGE_SIZE);
cNewTimers = (uint32_t)(cbNew / sizeof(TMTIMER));
RTR0MEMOBJ hMemObj;
int rc = RTR0MemObjAllocPage(&hMemObj, cbNew, false /*fExecutable*/);
if (RT_SUCCESS(rc))
{
/*
* Zero and map it.
*/
PTMTIMER paTimers = (PTMTIMER)RTR0MemObjAddress(hMemObj);
RT_BZERO(paTimers, cbNew);
RTR0MEMOBJ hMapObj;
rc = RTR0MemObjMapUser(&hMapObj, hMemObj, (RTR3PTR)-1, HOST_PAGE_SIZE,
RTMEM_PROT_READ | RTMEM_PROT_WRITE, RTR0ProcHandleSelf());
if (RT_SUCCESS(rc))
{
tmHCTimerQueueGrowInit(paTimers, pQueueR0->paTimers, cNewTimers, cOldTimers);
/*
* Switch the memory handles.
*/
RTR0MEMOBJ hTmp = pQueueR0->hMapObj;
pQueueR0->hMapObj = hMapObj;
hMapObj = hTmp;
hTmp = pQueueR0->hMemObj;
pQueueR0->hMemObj = hMemObj;
hMemObj = hTmp;
/*
* Update the variables.
*/
pQueueR0->paTimers = paTimers;
pQueueR0->cTimersAlloc = cNewTimers;
pQueueShared->paTimers = RTR0MemObjAddressR3(pQueueR0->hMapObj);
pQueueShared->cTimersAlloc = cNewTimers;
pQueueShared->cTimersFree += cNewTimers - (cOldTimers ? cOldTimers : 1);
/*
* Free the old allocation.
*/
RTR0MemObjFree(hMapObj, true /*fFreeMappings*/);
}
RTR0MemObjFree(hMemObj, true /*fFreeMappings*/);
}
return rc;
}
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