| 1 | /* $Id: PGMR0SharedPage.cpp 31441 2010-08-06 14:13:01Z 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 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 pGVM Pointer to the GVM instance data.
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| 41 | * @param idCpu VCPU id
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| 42 | * @param pModule Module description
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| 43 | * @param cRegions Number of regions
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| 44 | * @param pRegions Region array
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| 45 | */
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| 46 | VMMR0DECL(int) PGMR0SharedModuleCheck(PVM pVM, PGVM pGVM, VMCPUID idCpu, PGMMSHAREDMODULE pModule, uint32_t cRegions, PGMMSHAREDREGIONDESC pRegions)
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| 47 | {
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| 48 | int rc = VINF_SUCCESS;
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| 49 | GMMSHAREDPAGEDESC PageDesc;
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| 50 | bool fFlushTLBs = false;
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| 51 | PVMCPU pVCpu = &pVM->aCpus[idCpu];
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| 52 |
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| 53 | Log(("PGMR0SharedModuleCheck: check %s %s base=%RGv size=%x\n", pModule->szName, pModule->szVersion, pModule->Core.Key, pModule->cbModule));
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| 54 |
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| 55 | Assert(PGMIsLockOwner(pVM)); /* This cannot fail as we grab the lock in pgmR3SharedModuleRegRendezvous before calling into ring-0. */
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| 56 |
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| 57 | /* Check every region of the shared module. */
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| 58 | for (unsigned idxRegion = 0; idxRegion < cRegions; idxRegion++)
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| 59 | {
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| 60 | Assert((pRegions[idxRegion].cbRegion & 0xfff) == 0);
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| 61 | Assert((pRegions[idxRegion].GCRegionAddr & 0xfff) == 0);
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| 62 |
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| 63 | RTGCPTR GCRegion = pRegions[idxRegion].GCRegionAddr;
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| 64 | unsigned cbRegion = pRegions[idxRegion].cbRegion & ~0xfff;
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| 65 | unsigned idxPage = 0;
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| 66 |
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| 67 | while (cbRegion)
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| 68 | {
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| 69 | RTGCPHYS GCPhys;
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| 70 | uint64_t fFlags;
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| 71 |
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| 72 | /** @todo inefficient to fetch each guest page like this... */
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| 73 | rc = PGMGstGetPage(pVCpu, GCRegion, &fFlags, &GCPhys);
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| 74 | if ( rc == VINF_SUCCESS
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| 75 | && !(fFlags & X86_PTE_RW)) /* important as we make assumptions about this below! */
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| 76 | {
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| 77 | PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, GCPhys);
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| 78 | Assert(!pPage || !PGM_PAGE_IS_BALLOONED(pPage));
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| 79 | if ( pPage
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| 80 | && PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED)
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| 81 | {
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| 82 | PageDesc.uHCPhysPageId = PGM_PAGE_GET_PAGEID(pPage);
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| 83 | PageDesc.HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
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| 84 | PageDesc.GCPhys = GCPhys;
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| 85 |
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| 86 | rc = GMMR0SharedModuleCheckPage(pGVM, pModule, idxRegion, idxPage, &PageDesc);
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| 87 | if (rc == VINF_SUCCESS)
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| 88 | {
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| 89 | /* Any change for this page? */
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| 90 | if (PageDesc.uHCPhysPageId != NIL_GMM_PAGEID)
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| 91 | {
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| 92 | Assert(PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED);
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| 93 |
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| 94 | Log(("PGMR0SharedModuleCheck: shared page gc virt=%RGv phys %RGp host %RHp->%RHp\n", pRegions[idxRegion].GCRegionAddr + idxPage * PAGE_SIZE, PageDesc.GCPhys, PGM_PAGE_GET_HCPHYS(pPage), PageDesc.HCPhys));
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| 95 | if (PageDesc.HCPhys != PGM_PAGE_GET_HCPHYS(pPage))
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| 96 | {
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| 97 | bool fFlush = false;
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| 98 |
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| 99 | /* Page was replaced by an existing shared version of it; clear all references first. */
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| 100 | rc = pgmPoolTrackUpdateGCPhys(pVM, PageDesc.GCPhys, pPage, true /* clear the entries */, &fFlush);
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| 101 | 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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| 102 | if (rc == VINF_SUCCESS)
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| 103 | fFlushTLBs |= fFlush;
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| 104 |
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| 105 | /* Update the physical address and page id now. */
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| 106 | PGM_PAGE_SET_HCPHYS(pPage, PageDesc.HCPhys);
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| 107 | PGM_PAGE_SET_PAGEID(pPage, PageDesc.uHCPhysPageId);
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| 108 |
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| 109 | /* Invalidate page map TLB entry for this page too. */
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| 110 | PGMPhysInvalidatePageMapTLBEntry(pVM, PageDesc.GCPhys);
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| 111 | pVM->pgm.s.cReusedSharedPages++;
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| 112 | }
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| 113 | /* else nothing changed (== this page is now a shared page), so no need to flush anything. */
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| 114 |
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| 115 | pVM->pgm.s.cSharedPages++;
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| 116 | pVM->pgm.s.cPrivatePages--;
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| 117 | PGM_PAGE_SET_STATE(pPage, PGM_PAGE_STATE_SHARED);
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| 118 | }
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| 119 | }
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| 120 | else
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| 121 | break;
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| 122 | }
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| 123 | }
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| 124 | else
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| 125 | {
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| 126 | Assert( rc == VINF_SUCCESS
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| 127 | || rc == VERR_PAGE_NOT_PRESENT
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| 128 | || rc == VERR_PAGE_MAP_LEVEL4_NOT_PRESENT
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| 129 | || rc == VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT
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| 130 | || rc == VERR_PAGE_TABLE_NOT_PRESENT);
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| 131 | rc = VINF_SUCCESS; /* ignore error */
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| 132 | }
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| 133 |
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| 134 | idxPage++;
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| 135 | GCRegion += PAGE_SIZE;
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| 136 | cbRegion -= PAGE_SIZE;
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| 137 | }
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| 138 | }
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| 139 |
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| 140 | if (fFlushTLBs)
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| 141 | PGM_INVL_ALL_VCPU_TLBS(pVM);
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| 142 |
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| 143 | return rc;
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| 144 | }
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| 145 | #endif
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| 146 |
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