| 1 | /* $Id: PGMR0.cpp 61539 2010-05-12 15:11:09Z sandervl $ */
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| 2 | /** @file
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| 3 | * PGM - Page Manager and Monitor, Ring-0.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 | /*******************************************************************************
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| 19 | * Header Files *
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| 20 | *******************************************************************************/
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| 21 | #define LOG_GROUP LOG_GROUP_PGM_SHARED
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| 22 | #include <VBox/pgm.h>
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| 23 | #include <VBox/gmm.h>
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| 24 | #include "../PGMInternal.h"
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| 25 | #include <VBox/vm.h>
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| 26 | #include "../PGMInline.h"
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| 27 | #include <VBox/log.h>
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| 28 | #include <VBox/err.h>
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| 29 | #include <iprt/assert.h>
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| 30 | #include <iprt/mem.h>
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| 31 |
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| 32 |
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| 33 | #ifdef VBOX_WITH_PAGE_SHARING
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| 34 | /**
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| 35 | * Check a registered module for shared page changes
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| 36 | *
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| 37 | * @returns The following VBox status codes.
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| 38 | *
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| 39 | * @param pVM The VM handle.
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| 40 | * @param idCpu VCPU id
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| 41 | * @param pModule Module description
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| 42 | * @param pGVM Pointer to the GVM instance data.
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| 43 | */
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| 44 | VMMR0DECL(int) PGMR0SharedModuleCheckRegion(PVM pVM, VMCPUID idCpu, PGMMSHAREDMODULE pModule, PGVM pGVM)
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| 45 | {
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| 46 | int rc = VINF_SUCCESS;
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| 47 | PGMMSHAREDPAGEDESC paPageDesc = NULL;
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| 48 | uint32_t cbPreviousRegion = 0;
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| 49 | bool fFlushTLBs = false;
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| 50 | PVMCPU pVCpu = &pVM->aCpus[idCpu];
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| 51 |
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| 52 | Log(("PGMR0SharedModuleCheck: check %s %s base=%RGv size=%x\n", pModule->szName, pModule->szVersion, pModule->Core.Key, pModule->cbModule));
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| 53 |
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| 54 | pgmLock(pVM);
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| 55 |
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| 56 | /* Check every region of the shared module. */
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| 57 | for (unsigned idxModule = 0; idxModule < pModule->cRegions; idxModule++)
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| 58 | {
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| 59 | Assert((pModule->aRegions[idxModule].cbRegion & 0xfff) == 0);
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| 60 | Assert((pModule->aRegions[idxModule].GCRegionAddr & 0xfff) == 0);
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| 61 |
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| 62 | RTGCPTR GCRegion = pModule->aRegions[idxModule].GCRegionAddr;
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| 63 | unsigned cbRegion = pModule->aRegions[idxModule].cbRegion & ~0xfff;
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| 64 | unsigned idxPage = 0;
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| 65 | bool fValidChanges = false;
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| 66 |
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| 67 | if (cbPreviousRegion < cbRegion)
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| 68 | {
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| 69 | if (paPageDesc)
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| 70 | RTMemFree(paPageDesc);
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| 71 |
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| 72 | paPageDesc = (PGMMSHAREDPAGEDESC)RTMemAlloc((cbRegion >> PAGE_SHIFT) * sizeof(*paPageDesc));
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| 73 | if (!paPageDesc)
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| 74 | {
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| 75 | AssertFailed();
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| 76 | rc = VERR_NO_MEMORY;
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| 77 | goto end;
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| 78 | }
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| 79 | cbPreviousRegion = cbRegion;
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| 80 | }
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| 81 |
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| 82 | while (cbRegion)
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| 83 | {
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| 84 | RTGCPHYS GCPhys;
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| 85 | uint64_t fFlags;
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| 86 |
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| 87 | rc = PGMGstGetPage(pVCpu, GCRegion, &fFlags, &GCPhys);
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| 88 | if ( rc == VINF_SUCCESS
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| 89 | && !(fFlags & X86_PTE_RW)) /* important as we make assumptions about this below! */
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| 90 | {
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| 91 | PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, GCPhys);
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| 92 | if ( pPage
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| 93 | && !PGM_PAGE_IS_SHARED(pPage))
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| 94 | {
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| 95 | fValidChanges = true;
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| 96 | paPageDesc[idxPage].uHCPhysPageId = PGM_PAGE_GET_PAGEID(pPage);
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| 97 | paPageDesc[idxPage].HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
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| 98 | paPageDesc[idxPage].GCPhys = GCPhys;
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| 99 | }
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| 100 | else
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| 101 | paPageDesc[idxPage].uHCPhysPageId = NIL_GMM_PAGEID;
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| 102 | }
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| 103 | else
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| 104 | paPageDesc[idxPage].uHCPhysPageId = NIL_GMM_PAGEID;
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| 105 |
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| 106 | idxPage++;
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| 107 | GCRegion += PAGE_SIZE;
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| 108 | cbRegion -= PAGE_SIZE;
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| 109 | }
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| 110 |
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| 111 | if (fValidChanges)
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| 112 | {
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| 113 | rc = GMMR0SharedModuleCheckRange(pGVM, pModule, idxModule, idxPage, paPageDesc);
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| 114 | AssertRC(rc);
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| 115 | if (RT_FAILURE(rc))
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| 116 | break;
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| 117 |
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| 118 | for (unsigned i = 0; i < idxPage; i++)
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| 119 | {
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| 120 | /* Any change for this page? */
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| 121 | if (paPageDesc[i].uHCPhysPageId != NIL_GMM_PAGEID)
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| 122 | {
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| 123 | /** todo: maybe cache these to prevent the nth lookup. */
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| 124 | PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, paPageDesc[i].GCPhys);
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| 125 | if (!pPage)
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| 126 | {
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| 127 | /* Should never happen. */
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| 128 | AssertFailed();
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| 129 | rc = VERR_PGM_PHYS_INVALID_PAGE_ID;
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| 130 | goto end;
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| 131 | }
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| 132 | Assert(!PGM_PAGE_IS_SHARED(pPage));
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| 133 |
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| 134 | Log(("PGMR0SharedModuleCheck: shared page gc virt=%RGv phys %RGp host %RHp->%RHp\n", pModule->aRegions[idxModule].GCRegionAddr + i * PAGE_SIZE, paPageDesc[i].GCPhys, PGM_PAGE_GET_HCPHYS(pPage), paPageDesc[i].HCPhys));
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| 135 | if (paPageDesc[i].HCPhys != PGM_PAGE_GET_HCPHYS(pPage))
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| 136 | {
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| 137 | bool fFlush = false;
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| 138 |
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| 139 | /* Page was replaced by an existing shared version of it; clear all references first. */
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| 140 | rc = pgmPoolTrackUpdateGCPhys(pVM, paPageDesc[i].GCPhys, pPage, true /* clear the entries */, &fFlush);
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| 141 | if (RT_FAILURE(rc))
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| 142 | {
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| 143 | AssertRC(rc);
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| 144 | goto end;
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| 145 | }
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| 146 | Assert(rc == VINF_SUCCESS || (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_PGM_SYNC_CR3) && (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)));
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| 147 | if (rc == VINF_SUCCESS)
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| 148 | fFlushTLBs |= fFlush;
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| 149 |
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| 150 | /* Update the physical address and page id now. */
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| 151 | PGM_PAGE_SET_HCPHYS(pPage, paPageDesc[i].HCPhys);
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| 152 | PGM_PAGE_SET_PAGEID(pPage, paPageDesc[i].uHCPhysPageId);
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| 153 |
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| 154 | /* Invalidate page map TLB entry for this page too. */
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| 155 | PGMPhysInvalidatePageMapTLBEntry(pVM, paPageDesc[i].GCPhys);
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| 156 | pVM->pgm.s.cReusedSharedPages++;
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| 157 | }
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| 158 | /* else nothing changed (== this page is now a shared page), so no need to flush anything. */
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| 159 |
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| 160 | pVM->pgm.s.cSharedPages++;
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| 161 | pVM->pgm.s.cPrivatePages--;
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| 162 | PGM_PAGE_SET_STATE(pPage, PGM_PAGE_STATE_SHARED);
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| 163 | }
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| 164 | }
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| 165 | }
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| 166 | else
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| 167 | rc = VINF_SUCCESS; /* nothing to do. */
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| 168 | }
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| 169 |
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| 170 | end:
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| 171 | pgmUnlock(pVM);
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| 172 | if (fFlushTLBs)
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| 173 | PGM_INVL_ALL_VCPU_TLBS(pVM);
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| 174 |
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| 175 | if (paPageDesc)
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| 176 | RTMemFree(paPageDesc);
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| 177 |
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| 178 | return rc;
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| 179 | }
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| 180 | #endif
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| 181 |
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