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/* $Id: PGMR0Pool.cpp $ */
/** @file
* PGM Shadow Page Pool, ring-0 specific bits.
*/
/*
* 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_PGM_POOL
#define VBOX_WITHOUT_PAGING_BIT_FIELDS /* 64-bit bitfields are just asking for trouble. See @bugref{9841} and others. */
#include <VBox/vmm/pgm.h>
#include <VBox/vmm/hm.h>
#include "PGMInternal.h"
#include <VBox/vmm/vmcc.h>
#include "PGMInline.h"
#include <VBox/log.h>
#include <VBox/err.h>
#include <iprt/mem.h>
#include <iprt/memobj.h>
/**
* Called by PGMR0InitVM to complete the page pool setup for ring-0.
*
* @returns VBox status code.
* @param pGVM Pointer to the global VM structure.
*/
int pgmR0PoolInitVM(PGVM pGVM)
{
PPGMPOOL pPool = pGVM->pgm.s.pPoolR0;
AssertPtrReturn(pPool, VERR_PGM_POOL_IPE);
int rc = PGMR0HandlerPhysicalTypeSetUpContext(pGVM, PGMPHYSHANDLERKIND_WRITE, PGMPHYSHANDLER_F_KEEP_PGM_LOCK,
pgmPoolAccessHandler, pgmRZPoolAccessPfHandler,
"Guest Paging Access Handler", pPool->hAccessHandlerType);
AssertLogRelRCReturn(rc, rc);
return VINF_SUCCESS;
}
/**
* Worker for PGMR0PoolGrow.
*/
static int pgmR0PoolGrowInner(PGVM pGVM, PPGMPOOL pPool)
{
int rc;
/* With 32-bit guests and no EPT, the CR3 limits the root pages to low
(below 4 GB) memory. */
/** @todo change the pool to handle ROOT page allocations specially when
* required. */
bool const fCanUseHighMemory = HMIsNestedPagingActive(pGVM);
/*
* Figure out how many pages should allocate.
*/
uint32_t const cMaxPages = RT_MIN(pPool->cMaxPages, PGMPOOL_IDX_LAST);
uint32_t const cCurPages = RT_MIN(pPool->cCurPages, cMaxPages);
if (cCurPages < cMaxPages)
{
uint32_t cNewPages = cMaxPages - cCurPages;
if (cNewPages > PGMPOOL_CFG_MAX_GROW)
cNewPages = PGMPOOL_CFG_MAX_GROW;
LogFlow(("PGMR0PoolGrow: Growing the pool by %u (%#x) pages to %u (%#x) pages. fCanUseHighMemory=%RTbool\n",
cNewPages, cNewPages, cCurPages + cNewPages, cCurPages + cNewPages, fCanUseHighMemory));
/* Check that the handles in the arrays entry are both NIL. */
uintptr_t const idxMemHandle = cCurPages / (PGMPOOL_CFG_MAX_GROW);
AssertCompile( (PGMPOOL_IDX_LAST + (PGMPOOL_CFG_MAX_GROW - 1)) / PGMPOOL_CFG_MAX_GROW
<= RT_ELEMENTS(pGVM->pgmr0.s.ahPoolMemObjs));
AssertCompile(RT_ELEMENTS(pGVM->pgmr0.s.ahPoolMemObjs) == RT_ELEMENTS(pGVM->pgmr0.s.ahPoolMapObjs));
AssertLogRelMsgReturn( pGVM->pgmr0.s.ahPoolMemObjs[idxMemHandle] == NIL_RTR0MEMOBJ
&& pGVM->pgmr0.s.ahPoolMapObjs[idxMemHandle] == NIL_RTR0MEMOBJ, ("idxMemHandle=%#x\n", idxMemHandle),
VERR_PGM_POOL_IPE);
/*
* Allocate the new pages and map them into ring-3.
*/
RTR0MEMOBJ hMemObj = NIL_RTR0MEMOBJ;
if (fCanUseHighMemory)
rc = RTR0MemObjAllocPage(&hMemObj, cNewPages * HOST_PAGE_SIZE, false /*fExecutable*/);
else
rc = RTR0MemObjAllocLow(&hMemObj, cNewPages * HOST_PAGE_SIZE, false /*fExecutable*/);
if (RT_SUCCESS(rc))
{
RTR0MEMOBJ hMapObj = NIL_RTR0MEMOBJ;
rc = RTR0MemObjMapUser(&hMapObj, hMemObj, (RTR3PTR)-1, 0, RTMEM_PROT_READ | RTMEM_PROT_WRITE, NIL_RTR0PROCESS);
if (RT_SUCCESS(rc))
{
pGVM->pgmr0.s.ahPoolMemObjs[idxMemHandle] = hMemObj;
pGVM->pgmr0.s.ahPoolMapObjs[idxMemHandle] = hMapObj;
uint8_t *pbRing0 = (uint8_t *)RTR0MemObjAddress(hMemObj);
RTR3PTR pbRing3 = RTR0MemObjAddressR3(hMapObj);
AssertPtr(pbRing0);
Assert(((uintptr_t)pbRing0 & HOST_PAGE_OFFSET_MASK) == 0);
Assert(pbRing3 != NIL_RTR3PTR);
Assert((pbRing3 & HOST_PAGE_OFFSET_MASK) == 0);
/*
* Initialize the new pages.
*/
for (unsigned iNewPage = 0; iNewPage < cNewPages; iNewPage++)
{
PPGMPOOLPAGE pPage = &pPool->aPages[cCurPages + iNewPage];
pPage->pvPageR0 = &pbRing0[iNewPage * HOST_PAGE_SIZE];
pPage->pvPageR3 = pbRing3 + iNewPage * HOST_PAGE_SIZE;
pPage->Core.Key = RTR0MemObjGetPagePhysAddr(hMemObj, iNewPage);
AssertFatal(pPage->Core.Key < _4G || fCanUseHighMemory);
pPage->GCPhys = NIL_RTGCPHYS;
pPage->enmKind = PGMPOOLKIND_FREE;
pPage->idx = pPage - &pPool->aPages[0];
LogFlow(("PGMR0PoolGrow: insert page #%#x - %RHp\n", pPage->idx, pPage->Core.Key));
pPage->iNext = pPool->iFreeHead;
pPage->iUserHead = NIL_PGMPOOL_USER_INDEX;
pPage->iModifiedNext = NIL_PGMPOOL_IDX;
pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
pPage->iMonitoredPrev = NIL_PGMPOOL_IDX;
pPage->iAgeNext = NIL_PGMPOOL_IDX;
pPage->iAgePrev = NIL_PGMPOOL_IDX;
/* commit it */
bool fRc = RTAvloHCPhysInsert(&pPool->HCPhysTree, &pPage->Core); Assert(fRc); NOREF(fRc);
pPool->iFreeHead = cCurPages + iNewPage;
pPool->cCurPages = cCurPages + iNewPage + 1;
}
return VINF_SUCCESS;
}
RTR0MemObjFree(hMemObj, true /*fFreeMappings*/);
}
if (cCurPages > 64)
LogRelMax(5, ("PGMR0PoolGrow: rc=%Rrc cNewPages=%#x cCurPages=%#x cMaxPages=%#x fCanUseHighMemory=%d\n",
rc, cNewPages, cCurPages, cMaxPages, fCanUseHighMemory));
else
LogRel(("PGMR0PoolGrow: rc=%Rrc cNewPages=%#x cCurPages=%#x cMaxPages=%#x fCanUseHighMemory=%d\n",
rc, cNewPages, cCurPages, cMaxPages, fCanUseHighMemory));
}
else
rc = VINF_SUCCESS;
return rc;
}
/**
* Grows the shadow page pool.
*
* I.e. adds more pages to it, assuming that hasn't reached cMaxPages yet.
*
* @returns VBox status code.
* @param pGVM The ring-0 VM structure.
* @param idCpu The ID of the calling EMT.
* @thread EMT(idCpu)
*/
VMMR0_INT_DECL(int) PGMR0PoolGrow(PGVM pGVM, VMCPUID idCpu)
{
/*
* Validate input.
*/
PPGMPOOL pPool = pGVM->pgm.s.pPoolR0;
AssertReturn(pPool->cCurPages < pPool->cMaxPages, VERR_PGM_POOL_MAXED_OUT_ALREADY);
AssertReturn(pPool->pVMR3 == pGVM->pVMR3, VERR_PGM_POOL_IPE);
AssertReturn(pPool->pVMR0 == pGVM, VERR_PGM_POOL_IPE);
AssertReturn(idCpu < pGVM->cCpus, VERR_VM_THREAD_NOT_EMT);
PGVMCPU const pGVCpu = &pGVM->aCpus[idCpu];
/*
* Enter the grow critical section and call worker.
*/
STAM_REL_PROFILE_START(&pPool->StatGrow, a);
VMMR0EMTBLOCKCTX Ctx;
int rc = VMMR0EmtPrepareToBlock(pGVCpu, VINF_SUCCESS, __FUNCTION__, &pGVM->pgmr0.s.PoolGrowCritSect, &Ctx);
AssertRCReturn(rc, rc);
rc = RTCritSectEnter(&pGVM->pgmr0.s.PoolGrowCritSect);
AssertRCReturn(rc, rc);
rc = pgmR0PoolGrowInner(pGVM, pPool);
STAM_REL_PROFILE_STOP(&pPool->StatGrow, a);
RTCritSectLeave(&pGVM->pgmr0.s.PoolGrowCritSect);
VMMR0EmtResumeAfterBlocking(pGVCpu, &Ctx);
return rc;
}
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