| 1 | /* $Id: PGMSharedPage.cpp 29308 2010-05-10 15:23:09Z vboxsync $ */
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| 2 | /** @file
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| 3 | * PGM - Page Manager and Monitor, Shared page handling
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2010 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 | /*******************************************************************************
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| 20 | * Header Files *
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| 21 | *******************************************************************************/
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| 22 | #define LOG_GROUP LOG_GROUP_PGM
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| 23 | #include <VBox/pgm.h>
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| 24 | #include <VBox/stam.h>
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| 25 | #include "PGMInternal.h"
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| 26 | #include "PGMInline.h"
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| 27 | #include <VBox/vm.h>
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| 28 | #include <VBox/sup.h>
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| 29 | #include <VBox/param.h>
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| 30 | #include <VBox/err.h>
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| 31 | #include <VBox/log.h>
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| 32 | #include <iprt/assert.h>
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| 33 | #include <iprt/asm.h>
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| 34 | #include <iprt/string.h>
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| 35 | #include <iprt/mem.h>
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| 36 |
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| 37 |
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| 38 | #ifdef VBOX_WITH_PAGE_SHARING
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| 39 | /**
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| 40 | * Rendezvous callback that will be called once.
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| 41 | *
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| 42 | * @returns VBox strict status code.
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| 43 | * @param pVM VM handle.
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| 44 | * @param pVCpu The VMCPU handle for the calling EMT.
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| 45 | * @param pvUser PGMMREGISTERSHAREDMODULEREQ
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| 46 | */
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| 47 | static DECLCALLBACK(VBOXSTRICTRC) pgmR3SharedModuleRegRendezvous(PVM pVM, PVMCPU pVCpu, void *pvUser)
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| 48 | {
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| 49 | PGMMREGISTERSHAREDMODULEREQ pReq = (PGMMREGISTERSHAREDMODULEREQ)pvUser;
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| 50 |
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| 51 | return VMMR3CallR0(pVM, VMMR0_DO_PGM_CHECK_SHARED_MODULE, 0, &pReq->Hdr);
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| 52 | }
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| 53 |
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| 54 | /**
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| 55 | * Shared module registration helper (called on the way out).
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| 56 | *
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| 57 | * @param pVM The VM handle.
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| 58 | * @param pReq Registration request info
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| 59 | */
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| 60 | static DECLCALLBACK(void) pgmR3SharedModuleRegisterHelper(PVM pVM, PGMMREGISTERSHAREDMODULEREQ pReq)
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| 61 | {
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| 62 | int rc;
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| 63 |
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| 64 | rc = GMMR3RegisterSharedModule(pVM, pReq);
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| 65 | Assert(rc == VINF_SUCCESS || rc == VINF_PGM_SHARED_MODULE_COLLISION || rc == VINF_PGM_SHARED_MODULE_ALREADY_REGISTERED);
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| 66 | if (rc == VINF_PGM_SHARED_MODULE_ALREADY_REGISTERED)
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| 67 | {
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| 68 | PVMCPU pVCpu = VMMGetCpu(pVM);
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| 69 | unsigned cFlushedPages = 0;
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| 70 |
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| 71 | /** todo count copy-on-write actions in the trap handler so we don't have to check everything all the time! */
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| 72 |
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| 73 | /* Count the number of shared pages that were changed (copy-on-write). */
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| 74 | for (unsigned i = 0; i < pReq->cRegions; i++)
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| 75 | {
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| 76 | Assert((pReq->aRegions[i].cbRegion & 0xfff) == 0);
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| 77 | Assert((pReq->aRegions[i].GCRegionAddr & 0xfff) == 0);
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| 78 |
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| 79 | RTGCPTR GCRegion = pReq->aRegions[i].GCRegionAddr;
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| 80 | uint32_t cbRegion = pReq->aRegions[i].cbRegion & ~0xfff;
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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, &GCPhys, &fFlags);
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| 88 | if ( rc == VINF_SUCCESS
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| 89 | && !(fFlags & X86_PTE_RW))
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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 | cFlushedPages++;
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| 96 | }
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| 97 | }
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| 98 |
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| 99 | GCRegion += PAGE_SIZE;
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| 100 | cbRegion -= PAGE_SIZE;
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| 101 | }
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| 102 | }
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| 103 |
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| 104 | if (cFlushedPages > 32)
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| 105 | rc = VINF_SUCCESS; /* force recheck below */
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| 106 | }
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| 107 | /* Full (re)check needed? */
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| 108 | if (rc == VINF_SUCCESS)
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| 109 | {
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| 110 | pReq->Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
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| 111 | pReq->Hdr.cbReq = sizeof(*pReq);
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| 112 |
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| 113 | /* We must stall other VCPUs as we'd otherwise have to send IPI flush commands for every single change we make. */
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| 114 | rc = VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, pgmR3SharedModuleRegRendezvous, pReq);
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| 115 | AssertRC(rc);
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| 116 | }
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| 117 | RTMemFree(pReq);
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| 118 | return;
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| 119 | }
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| 120 | #endif
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| 121 |
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| 122 | /**
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| 123 | * Registers a new shared module for the VM
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| 124 | *
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| 125 | * @returns VBox status code.
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| 126 | * @param pVM VM handle
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| 127 | * @param enmGuestOS Guest OS type
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| 128 | * @param pszModuleName Module name
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| 129 | * @param pszVersion Module version
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| 130 | * @param GCBaseAddr Module base address
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| 131 | * @param cbModule Module size
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| 132 | * @param cRegions Number of shared region descriptors
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| 133 | * @param pRegions Shared region(s)
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| 134 | */
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| 135 | VMMR3DECL(int) PGMR3SharedModuleRegister(PVM pVM, VBOXOSFAMILY enmGuestOS, char *pszModuleName, char *pszVersion, RTGCPTR GCBaseAddr, uint32_t cbModule,
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| 136 | unsigned cRegions, VMMDEVSHAREDREGIONDESC *pRegions)
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| 137 | {
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| 138 | #ifdef VBOX_WITH_PAGE_SHARING
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| 139 | PGMMREGISTERSHAREDMODULEREQ pReq;
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| 140 |
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| 141 | /* Sanity check. */
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| 142 | AssertReturn(cRegions < VMMDEVSHAREDREGIONDESC_MAX, VERR_INVALID_PARAMETER);
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| 143 |
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| 144 | pReq = (PGMMREGISTERSHAREDMODULEREQ)RTMemAllocZ(RT_OFFSETOF(GMMREGISTERSHAREDMODULEREQ, aRegions[cRegions]));
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| 145 | AssertReturn(pReq, VERR_NO_MEMORY);
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| 146 |
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| 147 | pReq->enmGuestOS = enmGuestOS;
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| 148 | pReq->GCBaseAddr = GCBaseAddr;
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| 149 | pReq->cbModule = cbModule;
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| 150 | pReq->cRegions = cRegions;
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| 151 | for (unsigned i = 0; i < cRegions; i++)
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| 152 | pReq->aRegions[i] = pRegions[i];
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| 153 |
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| 154 | if ( RTStrCopy(pReq->szName, sizeof(pReq->szName), pszModuleName) != VINF_SUCCESS
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| 155 | || RTStrCopy(pReq->szVersion, sizeof(pReq->szVersion), pszVersion) != VINF_SUCCESS)
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| 156 | {
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| 157 | RTMemFree(pReq);
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| 158 | return VERR_BUFFER_OVERFLOW;
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| 159 | }
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| 160 |
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| 161 | /* Queue the actual registration as we are under the IOM lock right now. Perform this operation on the way out. */
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| 162 | return VMR3ReqCallNoWait(pVM, VMMGetCpuId(pVM), (PFNRT)pgmR3SharedModuleRegisterHelper, 2, pVM, pReq);
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| 163 | #else
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| 164 | return VERR_NOT_IMPLEMENTED;
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| 165 | #endif
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| 166 | }
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| 167 |
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| 168 |
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| 169 | #ifdef VBOX_WITH_PAGE_SHARING
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| 170 | /**
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| 171 | * Shared module unregistration helper (called on the way out).
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| 172 | *
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| 173 | * @param pVM The VM handle.
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| 174 | * @param pReq Unregistration request info
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| 175 | */
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| 176 | static DECLCALLBACK(void) pgmR3SharedModuleUnregisterHelper(PVM pVM, PGMMREGISTERSHAREDMODULEREQ pReq)
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| 177 | {
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| 178 | int rc;
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| 179 |
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| 180 | rc = GMMR3UnregisterSharedModule(pVM, pReq);
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| 181 | RTMemFree(pReq);
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| 182 | return;
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| 183 | }
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| 184 | #endif
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| 185 |
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| 186 | /**
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| 187 | * Unregisters a shared module for the VM
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| 188 | *
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| 189 | * @returns VBox status code.
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| 190 | * @param pVM VM handle
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| 191 | * @param pszModuleName Module name
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| 192 | * @param pszVersion Module version
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| 193 | * @param GCBaseAddr Module base address
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| 194 | * @param cbModule Module size
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| 195 | */
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| 196 | VMMR3DECL(int) PGMR3SharedModuleUnregister(PVM pVM, char *pszModuleName, char *pszVersion, RTGCPTR GCBaseAddr, uint32_t cbModule)
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| 197 | {
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| 198 | #ifdef VBOX_WITH_PAGE_SHARING
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| 199 | PGMMUNREGISTERSHAREDMODULEREQ pReq;
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| 200 |
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| 201 | pReq = (PGMMUNREGISTERSHAREDMODULEREQ)RTMemAllocZ(sizeof(*pReq));
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| 202 | AssertReturn(pReq, VERR_NO_MEMORY);
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| 203 |
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| 204 | pReq->GCBaseAddr = GCBaseAddr;
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| 205 | pReq->cbModule = cbModule;
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| 206 |
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| 207 | if ( RTStrCopy(pReq->szName, sizeof(pReq->szName), pszModuleName) != VINF_SUCCESS
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| 208 | || RTStrCopy(pReq->szVersion, sizeof(pReq->szVersion), pszVersion) != VINF_SUCCESS)
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| 209 | {
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| 210 | return VERR_BUFFER_OVERFLOW;
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| 211 | }
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| 212 | /* Queue the actual registration as we are under the IOM lock right now. Perform this operation on the way out. */
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| 213 | return VMR3ReqCallNoWait(pVM, VMMGetCpuId(pVM), (PFNRT)pgmR3SharedModuleUnregisterHelper, 2, pVM, pReq);
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| 214 | #else
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| 215 | return VERR_NOT_IMPLEMENTED;
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| 216 | #endif
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| 217 | }
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