| 1 | /* $Id: PGMR0Pool.cpp 108132 2025-02-10 11:05:23Z vboxsync $ */
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| 2 | /** @file
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| 3 | * PGM Shadow Page Pool, ring-0 specific bits.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2024 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.alldomusa.eu.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 |
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| 29 | /*********************************************************************************************************************************
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| 30 | * Header Files *
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| 31 | *********************************************************************************************************************************/
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| 32 | #define LOG_GROUP LOG_GROUP_PGM_POOL
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| 33 | #define VBOX_WITHOUT_PAGING_BIT_FIELDS /* 64-bit bitfields are just asking for trouble. See @bugref{9841} and others. */
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| 34 | #define VBOX_VMM_TARGET_X86
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| 35 | #include <VBox/vmm/pgm.h>
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| 36 | #include <VBox/vmm/hm.h>
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| 37 | #include "PGMInternal.h"
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| 38 | #include <VBox/vmm/vmcc.h>
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| 39 | #include "PGMInline.h"
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| 40 |
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| 41 | #include <VBox/log.h>
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| 42 | #include <VBox/err.h>
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| 43 | #include <iprt/mem.h>
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| 44 | #include <iprt/memobj.h>
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| 45 |
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| 46 |
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| 47 | /**
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| 48 | * Called by PGMR0InitVM to complete the page pool setup for ring-0.
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| 49 | *
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| 50 | * @returns VBox status code.
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| 51 | * @param pGVM Pointer to the global VM structure.
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| 52 | */
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| 53 | int pgmR0PoolInitVM(PGVM pGVM)
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| 54 | {
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| 55 | PPGMPOOL pPool = pGVM->pgm.s.pPoolR0;
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| 56 | AssertPtrReturn(pPool, VERR_PGM_POOL_IPE);
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| 57 |
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| 58 | int rc = PGMR0HandlerPhysicalTypeSetUpContext(pGVM, PGMPHYSHANDLERKIND_WRITE, PGMPHYSHANDLER_F_KEEP_PGM_LOCK,
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| 59 | pgmPoolAccessHandler, pgmRZPoolAccessPfHandler,
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| 60 | "Guest Paging Access Handler", pPool->hAccessHandlerType);
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| 61 | AssertLogRelRCReturn(rc, rc);
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| 62 |
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| 63 | return VINF_SUCCESS;
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| 64 | }
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| 65 |
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| 66 |
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| 67 | /**
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| 68 | * Worker for PGMR0PoolGrow.
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| 69 | */
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| 70 | static int pgmR0PoolGrowInner(PGVM pGVM, PPGMPOOL pPool)
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| 71 | {
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| 72 | int rc;
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| 73 |
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| 74 | /* With 32-bit guests and no EPT, the CR3 limits the root pages to low
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| 75 | (below 4 GB) memory. */
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| 76 | /** @todo change the pool to handle ROOT page allocations specially when
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| 77 | * required. */
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| 78 | bool const fCanUseHighMemory = HMIsNestedPagingActive(pGVM);
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| 79 |
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| 80 | /*
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| 81 | * Figure out how many pages should allocate.
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| 82 | */
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| 83 | uint32_t const cMaxPages = RT_MIN(pPool->cMaxPages, PGMPOOL_IDX_LAST);
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| 84 | uint32_t const cCurPages = RT_MIN(pPool->cCurPages, cMaxPages);
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| 85 | if (cCurPages < cMaxPages)
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| 86 | {
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| 87 | uint32_t cNewPages = cMaxPages - cCurPages;
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| 88 | if (cNewPages > PGMPOOL_CFG_MAX_GROW)
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| 89 | cNewPages = PGMPOOL_CFG_MAX_GROW;
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| 90 | LogFlow(("PGMR0PoolGrow: Growing the pool by %u (%#x) pages to %u (%#x) pages. fCanUseHighMemory=%RTbool\n",
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| 91 | cNewPages, cNewPages, cCurPages + cNewPages, cCurPages + cNewPages, fCanUseHighMemory));
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| 92 |
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| 93 | /* Check that the handles in the arrays entry are both NIL. */
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| 94 | uintptr_t const idxMemHandle = cCurPages / (PGMPOOL_CFG_MAX_GROW);
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| 95 | AssertCompile( (PGMPOOL_IDX_LAST + (PGMPOOL_CFG_MAX_GROW - 1)) / PGMPOOL_CFG_MAX_GROW
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| 96 | <= RT_ELEMENTS(pGVM->pgmr0.s.ahPoolMemObjs));
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| 97 | AssertCompile(RT_ELEMENTS(pGVM->pgmr0.s.ahPoolMemObjs) == RT_ELEMENTS(pGVM->pgmr0.s.ahPoolMapObjs));
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| 98 | AssertLogRelMsgReturn( pGVM->pgmr0.s.ahPoolMemObjs[idxMemHandle] == NIL_RTR0MEMOBJ
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| 99 | && pGVM->pgmr0.s.ahPoolMapObjs[idxMemHandle] == NIL_RTR0MEMOBJ, ("idxMemHandle=%#x\n", idxMemHandle),
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| 100 | VERR_PGM_POOL_IPE);
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| 101 |
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| 102 | /*
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| 103 | * Allocate the new pages and map them into ring-3.
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| 104 | */
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| 105 | RTR0MEMOBJ hMemObj = NIL_RTR0MEMOBJ;
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| 106 | if (fCanUseHighMemory)
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| 107 | rc = RTR0MemObjAllocPage(&hMemObj, cNewPages * HOST_PAGE_SIZE, false /*fExecutable*/);
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| 108 | else
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| 109 | rc = RTR0MemObjAllocLow(&hMemObj, cNewPages * HOST_PAGE_SIZE, false /*fExecutable*/);
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| 110 | if (RT_SUCCESS(rc))
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| 111 | {
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| 112 | RTR0MEMOBJ hMapObj = NIL_RTR0MEMOBJ;
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| 113 | rc = RTR0MemObjMapUser(&hMapObj, hMemObj, (RTR3PTR)-1, 0, RTMEM_PROT_READ | RTMEM_PROT_WRITE, NIL_RTR0PROCESS);
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| 114 | if (RT_SUCCESS(rc))
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| 115 | {
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| 116 | pGVM->pgmr0.s.ahPoolMemObjs[idxMemHandle] = hMemObj;
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| 117 | pGVM->pgmr0.s.ahPoolMapObjs[idxMemHandle] = hMapObj;
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| 118 |
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| 119 | uint8_t *pbRing0 = (uint8_t *)RTR0MemObjAddress(hMemObj);
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| 120 | RTR3PTR pbRing3 = RTR0MemObjAddressR3(hMapObj);
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| 121 | AssertPtr(pbRing0);
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| 122 | Assert(((uintptr_t)pbRing0 & HOST_PAGE_OFFSET_MASK) == 0);
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| 123 | Assert(pbRing3 != NIL_RTR3PTR);
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| 124 | Assert((pbRing3 & HOST_PAGE_OFFSET_MASK) == 0);
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| 125 |
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| 126 | /*
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| 127 | * Initialize the new pages.
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| 128 | */
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| 129 | for (unsigned iNewPage = 0; iNewPage < cNewPages; iNewPage++)
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| 130 | {
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| 131 | PPGMPOOLPAGE pPage = &pPool->aPages[cCurPages + iNewPage];
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| 132 | pPage->pvPageR0 = &pbRing0[iNewPage * HOST_PAGE_SIZE];
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| 133 | pPage->pvPageR3 = pbRing3 + iNewPage * HOST_PAGE_SIZE;
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| 134 | pPage->Core.Key = RTR0MemObjGetPagePhysAddr(hMemObj, iNewPage);
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| 135 | AssertFatal(pPage->Core.Key < _4G || fCanUseHighMemory);
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| 136 | pPage->GCPhys = NIL_RTGCPHYS;
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| 137 | pPage->enmKind = PGMPOOLKIND_FREE;
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| 138 | pPage->idx = pPage - &pPool->aPages[0];
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| 139 | LogFlow(("PGMR0PoolGrow: insert page #%#x - %RHp\n", pPage->idx, pPage->Core.Key));
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| 140 | pPage->iNext = pPool->iFreeHead;
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| 141 | pPage->iUserHead = NIL_PGMPOOL_USER_INDEX;
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| 142 | pPage->iModifiedNext = NIL_PGMPOOL_IDX;
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| 143 | pPage->iModifiedPrev = NIL_PGMPOOL_IDX;
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| 144 | pPage->iMonitoredNext = NIL_PGMPOOL_IDX;
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| 145 | pPage->iMonitoredPrev = NIL_PGMPOOL_IDX;
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| 146 | pPage->iAgeNext = NIL_PGMPOOL_IDX;
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| 147 | pPage->iAgePrev = NIL_PGMPOOL_IDX;
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| 148 | /* commit it */
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| 149 | bool fRc = RTAvloHCPhysInsert(&pPool->HCPhysTree, &pPage->Core); Assert(fRc); NOREF(fRc);
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| 150 | pPool->iFreeHead = cCurPages + iNewPage;
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| 151 | pPool->cCurPages = cCurPages + iNewPage + 1;
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| 152 | }
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| 153 |
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| 154 | return VINF_SUCCESS;
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| 155 | }
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| 156 |
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| 157 | RTR0MemObjFree(hMemObj, true /*fFreeMappings*/);
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| 158 | }
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| 159 | if (cCurPages > 64)
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| 160 | LogRelMax(5, ("PGMR0PoolGrow: rc=%Rrc cNewPages=%#x cCurPages=%#x cMaxPages=%#x fCanUseHighMemory=%d\n",
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| 161 | rc, cNewPages, cCurPages, cMaxPages, fCanUseHighMemory));
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| 162 | else
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| 163 | LogRel(("PGMR0PoolGrow: rc=%Rrc cNewPages=%#x cCurPages=%#x cMaxPages=%#x fCanUseHighMemory=%d\n",
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| 164 | rc, cNewPages, cCurPages, cMaxPages, fCanUseHighMemory));
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| 165 | }
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| 166 | else
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| 167 | rc = VINF_SUCCESS;
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| 168 | return rc;
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| 169 | }
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| 170 |
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| 171 |
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| 172 | /**
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| 173 | * Grows the shadow page pool.
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| 174 | *
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| 175 | * I.e. adds more pages to it, assuming that hasn't reached cMaxPages yet.
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| 176 | *
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| 177 | * @returns VBox status code.
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| 178 | * @param pGVM The ring-0 VM structure.
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| 179 | * @param idCpu The ID of the calling EMT.
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| 180 | * @thread EMT(idCpu)
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| 181 | */
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| 182 | VMMR0_INT_DECL(int) PGMR0PoolGrow(PGVM pGVM, VMCPUID idCpu)
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| 183 | {
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| 184 | /*
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| 185 | * Validate input.
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| 186 | */
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| 187 | PPGMPOOL pPool = pGVM->pgm.s.pPoolR0;
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| 188 | AssertReturn(pPool->cCurPages < pPool->cMaxPages, VERR_PGM_POOL_MAXED_OUT_ALREADY);
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| 189 | AssertReturn(pPool->pVMR3 == pGVM->pVMR3, VERR_PGM_POOL_IPE);
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| 190 | AssertReturn(pPool->pVMR0 == pGVM, VERR_PGM_POOL_IPE);
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| 191 |
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| 192 | AssertReturn(idCpu < pGVM->cCpus, VERR_VM_THREAD_NOT_EMT);
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| 193 | PGVMCPU const pGVCpu = &pGVM->aCpus[idCpu];
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| 194 |
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| 195 | /*
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| 196 | * Enter the grow critical section and call worker.
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| 197 | */
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| 198 | STAM_REL_PROFILE_START(&pPool->StatGrow, a);
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| 199 |
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| 200 | VMMR0EMTBLOCKCTX Ctx;
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| 201 | int rc = VMMR0EmtPrepareToBlock(pGVCpu, VINF_SUCCESS, __FUNCTION__, &pGVM->pgmr0.s.PoolGrowCritSect, &Ctx);
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| 202 | AssertRCReturn(rc, rc);
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| 203 |
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| 204 | rc = RTCritSectEnter(&pGVM->pgmr0.s.PoolGrowCritSect);
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| 205 | AssertRCReturn(rc, rc);
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| 206 |
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| 207 | rc = pgmR0PoolGrowInner(pGVM, pPool);
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| 208 |
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| 209 | STAM_REL_PROFILE_STOP(&pPool->StatGrow, a);
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| 210 | RTCritSectLeave(&pGVM->pgmr0.s.PoolGrowCritSect);
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| 211 |
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| 212 | VMMR0EmtResumeAfterBlocking(pGVCpu, &Ctx);
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| 213 | return rc;
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| 214 | }
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| 215 |
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