| 1 | /* $Id: PGMR0SharedPage.cpp 108132 2025-02-10 11:05:23Z vboxsync $ */
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| 2 | /** @file
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| 3 | * PGM - Page Manager and Monitor, Page Sharing, Ring-0.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2010-2024 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_SHARED
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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/iem.h>
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| 37 | #include <VBox/vmm/gmm.h>
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| 38 | #include "PGMInternal.h"
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| 39 | #include <VBox/vmm/vmcc.h>
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| 40 | #include <VBox/vmm/gvm.h>
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| 41 | #include "PGMInline.h"
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| 42 | #include <VBox/log.h>
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| 43 | #include <VBox/err.h>
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| 44 | #include <iprt/assert.h>
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| 45 | #include <iprt/mem.h>
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| 46 |
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| 47 |
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| 48 | #ifdef VBOX_WITH_PAGE_SHARING
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| 49 | /**
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| 50 | * Check a registered module for shared page changes.
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| 51 | *
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| 52 | * The PGM lock shall be taken prior to calling this method.
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| 53 | *
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| 54 | * @returns The following VBox status codes.
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| 55 | *
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| 56 | * @param pVM The cross context VM structure.
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| 57 | * @param pGVM Pointer to the GVM instance data.
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| 58 | * @param idCpu The ID of the calling virtual CPU.
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| 59 | * @param pModule Global module description.
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| 60 | * @param paRegionsGCPtrs Array parallel to pModules->aRegions with the
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| 61 | * addresses of the regions in the calling
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| 62 | * process.
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| 63 | */
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| 64 | VMMR0DECL(int) PGMR0SharedModuleCheck(PVMCC pVM, PGVM pGVM, VMCPUID idCpu, PGMMSHAREDMODULE pModule, PCRTGCPTR64 paRegionsGCPtrs)
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| 65 | {
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| 66 | PVMCPUCC pVCpu = &pGVM->aCpus[idCpu];
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| 67 | int rc = VINF_SUCCESS;
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| 68 | bool fFlushTLBs = false;
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| 69 | bool fFlushRemTLBs = false;
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| 70 | GMMSHAREDPAGEDESC PageDesc;
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| 71 |
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| 72 | Log(("PGMR0SharedModuleCheck: check %s %s base=%RGv size=%x\n", pModule->szName, pModule->szVersion, pModule->Core.Key, pModule->cbModule));
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| 73 |
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| 74 | PGM_LOCK_ASSERT_OWNER(pVM); /* This cannot fail as we grab the lock in pgmR3SharedModuleRegRendezvous before calling into ring-0. */
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| 75 |
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| 76 | /*
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| 77 | * Check every region of the shared module.
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| 78 | */
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| 79 | for (uint32_t idxRegion = 0; idxRegion < pModule->cRegions; idxRegion++)
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| 80 | {
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| 81 | RTGCPTR GCPtrPage = paRegionsGCPtrs[idxRegion] & ~(RTGCPTR)GUEST_PAGE_OFFSET_MASK;
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| 82 | uint32_t cbLeft = pModule->aRegions[idxRegion].cb; Assert(!(cbLeft & GUEST_PAGE_OFFSET_MASK));
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| 83 | uint32_t idxPage = 0;
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| 84 |
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| 85 | while (cbLeft)
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| 86 | {
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| 87 | /** @todo inefficient to fetch each guest page like this... */
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| 88 | PGMPTWALK Walk;
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| 89 | rc = PGMGstGetPage(pVCpu, GCPtrPage, &Walk);
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| 90 | if ( rc == VINF_SUCCESS
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| 91 | && !(Walk.fEffective & X86_PTE_RW)) /* important as we make assumptions about this below! */
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| 92 | {
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| 93 | PPGMPAGE pPage = pgmPhysGetPage(pVM, Walk.GCPhys);
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| 94 | Assert(!pPage || !PGM_PAGE_IS_BALLOONED(pPage));
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| 95 | if ( pPage
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| 96 | && PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED
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| 97 | && PGM_PAGE_GET_READ_LOCKS(pPage) == 0
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| 98 | && PGM_PAGE_GET_WRITE_LOCKS(pPage) == 0 )
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| 99 | {
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| 100 | PageDesc.idPage = PGM_PAGE_GET_PAGEID(pPage);
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| 101 | PageDesc.HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
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| 102 | PageDesc.GCPhys = Walk.GCPhys;
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| 103 |
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| 104 | rc = GMMR0SharedModuleCheckPage(pGVM, pModule, idxRegion, idxPage, &PageDesc);
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| 105 | if (RT_FAILURE(rc))
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| 106 | break;
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| 107 |
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| 108 | /*
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| 109 | * Any change for this page?
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| 110 | */
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| 111 | if (PageDesc.idPage != NIL_GMM_PAGEID)
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| 112 | {
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| 113 | Assert(PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED);
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| 114 |
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| 115 | Log(("PGMR0SharedModuleCheck: shared page gst virt=%RGv phys=%RGp host %RHp->%RHp\n",
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| 116 | GCPtrPage, PageDesc.GCPhys, PGM_PAGE_GET_HCPHYS(pPage), PageDesc.HCPhys));
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| 117 |
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| 118 | /* Page was either replaced by an existing shared
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| 119 | version of it or converted into a read-only shared
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| 120 | page, so, clear all references. */
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| 121 | bool fFlush = false;
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| 122 | rc = pgmPoolTrackUpdateGCPhys(pVM, PageDesc.GCPhys, pPage, true /* clear the entries */, &fFlush);
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| 123 | Assert( rc == VINF_SUCCESS
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| 124 | || ( VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3)
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| 125 | && (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)));
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| 126 | if (rc == VINF_SUCCESS)
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| 127 | fFlushTLBs |= fFlush;
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| 128 | fFlushRemTLBs = true;
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| 129 |
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| 130 | if (PageDesc.HCPhys != PGM_PAGE_GET_HCPHYS(pPage))
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| 131 | {
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| 132 | /* Update the physical address and page id now. */
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| 133 | PGM_PAGE_SET_HCPHYS(pVM, pPage, PageDesc.HCPhys);
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| 134 | PGM_PAGE_SET_PAGEID(pVM, pPage, PageDesc.idPage);
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| 135 |
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| 136 | /* Invalidate page map TLB entry for this page too. */
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| 137 | pgmPhysInvalidatePageMapTLBEntry(pVM, PageDesc.GCPhys);
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| 138 | IEMTlbInvalidateAllPhysicalAllCpus(pVM, NIL_VMCPUID, IEMTLBPHYSFLUSHREASON_SHARED);
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| 139 | pVM->pgm.s.cReusedSharedPages++;
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| 140 | }
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| 141 | /* else: nothing changed (== this page is now a shared
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| 142 | page), so no need to flush anything. */
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| 143 |
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| 144 | pVM->pgm.s.cSharedPages++;
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| 145 | pVM->pgm.s.cPrivatePages--;
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| 146 | PGM_PAGE_SET_STATE(pVM, pPage, PGM_PAGE_STATE_SHARED);
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| 147 |
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| 148 | # ifdef VBOX_STRICT /* check sum hack */
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| 149 | pPage->s.u2Unused0 = PageDesc.u32StrictChecksum & 3;
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| 150 | //pPage->s.u2Unused1 = (PageDesc.u32StrictChecksum >> 8) & 3;
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| 151 | # endif
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| 152 | }
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| 153 | }
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| 154 | }
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| 155 | else
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| 156 | {
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| 157 | Assert( rc == VINF_SUCCESS
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| 158 | || rc == VERR_PAGE_NOT_PRESENT
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| 159 | || rc == VERR_PAGE_MAP_LEVEL4_NOT_PRESENT
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| 160 | || rc == VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT
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| 161 | || rc == VERR_PAGE_TABLE_NOT_PRESENT);
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| 162 | rc = VINF_SUCCESS; /* ignore error */
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| 163 | }
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| 164 |
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| 165 | idxPage++;
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| 166 | GCPtrPage += HOST_PAGE_SIZE;
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| 167 | cbLeft -= HOST_PAGE_SIZE;
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| 168 | }
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| 169 | }
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| 170 |
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| 171 | /*
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| 172 | * Do TLB flushing if necessary.
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| 173 | */
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| 174 | if (fFlushTLBs)
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| 175 | PGM_INVL_ALL_VCPU_TLBS(pVM);
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| 176 |
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| 177 | if (fFlushRemTLBs)
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| 178 | for (VMCPUID idCurCpu = 0; idCurCpu < pGVM->cCpus; idCurCpu++)
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| 179 | CPUMSetChangedFlags(&pGVM->aCpus[idCurCpu], CPUM_CHANGED_GLOBAL_TLB_FLUSH);
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| 180 |
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| 181 | return rc;
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| 182 | }
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| 183 | #endif /* VBOX_WITH_PAGE_SHARING */
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| 184 |
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