| 1 | /* $Id: PGMSharedPage.cpp 29203 2010-05-07 12:40:36Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * PGM - Page Manager and Monitor, Shared page handling
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2010 Oracle Corporation
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | */
|
|---|
| 17 |
|
|---|
| 18 |
|
|---|
| 19 | /*******************************************************************************
|
|---|
| 20 | * Header Files *
|
|---|
| 21 | *******************************************************************************/
|
|---|
| 22 | #define LOG_GROUP LOG_GROUP_PGM
|
|---|
| 23 | #include <VBox/pgm.h>
|
|---|
| 24 | #include <VBox/stam.h>
|
|---|
| 25 | #include "PGMInternal.h"
|
|---|
| 26 | #include "PGMInline.h"
|
|---|
| 27 | #include <VBox/vm.h>
|
|---|
| 28 | #include <VBox/sup.h>
|
|---|
| 29 | #include <VBox/param.h>
|
|---|
| 30 | #include <VBox/err.h>
|
|---|
| 31 | #include <VBox/log.h>
|
|---|
| 32 | #include <iprt/assert.h>
|
|---|
| 33 | #include <iprt/asm.h>
|
|---|
| 34 | #include <iprt/string.h>
|
|---|
| 35 | #include <iprt/mem.h>
|
|---|
| 36 |
|
|---|
| 37 |
|
|---|
| 38 | #ifdef VBOX_WITH_PAGE_SHARING
|
|---|
| 39 | /**
|
|---|
| 40 | * Rendezvous callback that will be called once.
|
|---|
| 41 | *
|
|---|
| 42 | * @returns VBox strict status code.
|
|---|
| 43 | * @param pVM VM handle.
|
|---|
| 44 | * @param pVCpu The VMCPU handle for the calling EMT.
|
|---|
| 45 | * @param pvUser PGMMREGISTERSHAREDMODULEREQ
|
|---|
| 46 | */
|
|---|
| 47 | static DECLCALLBACK(VBOXSTRICTRC) pgmR3SharedModuleRegRendezvous(PVM pVM, PVMCPU pVCpu, void *pvUser)
|
|---|
| 48 | {
|
|---|
| 49 | PGMMREGISTERSHAREDMODULEREQ pReq = (PGMMREGISTERSHAREDMODULEREQ)pvUser;
|
|---|
| 50 |
|
|---|
| 51 | return VMMR3CallR0(pVM, VMMR0_DO_PGM_CHECK_SHARED_MODULE, 0, &pReq->Hdr);
|
|---|
| 52 | }
|
|---|
| 53 |
|
|---|
| 54 | /**
|
|---|
| 55 | * Shared module registration helper (called on the way out).
|
|---|
| 56 | *
|
|---|
| 57 | * @param pVM The VM handle.
|
|---|
| 58 | * @param pReq Registration request info
|
|---|
| 59 | */
|
|---|
| 60 | static DECLCALLBACK(void) pgmR3SharedModuleRegisterHelper(PVM pVM, PGMMREGISTERSHAREDMODULEREQ pReq)
|
|---|
| 61 | {
|
|---|
| 62 | int rc;
|
|---|
| 63 |
|
|---|
| 64 | rc = GMMR3RegisterSharedModule(pVM, pReq);
|
|---|
| 65 | Assert(rc == VINF_SUCCESS || rc == VINF_PGM_SHARED_MODULE_COLLISION || rc == VINF_PGM_SHARED_MODULE_ALREADY_REGISTERED);
|
|---|
| 66 | if (rc == VINF_PGM_SHARED_MODULE_ALREADY_REGISTERED)
|
|---|
| 67 | {
|
|---|
| 68 | PVMCPU pVCpu = VMMGetCpu(pVM);
|
|---|
| 69 | unsigned cFlushedPages = 0;
|
|---|
| 70 |
|
|---|
| 71 | /** todo count copy-on-write actions in the trap handler so we don't have to check everything all the time! */
|
|---|
| 72 |
|
|---|
| 73 | /* Count the number of shared pages that were changed (copy-on-write). */
|
|---|
| 74 | for (unsigned i = 0; i < pReq->cRegions; i++)
|
|---|
| 75 | {
|
|---|
| 76 | Assert((pReq->aRegions[i].cbRegion & 0xfff) == 0);
|
|---|
| 77 | Assert((pReq->aRegions[i].GCRegionAddr & 0xfff) == 0);
|
|---|
| 78 |
|
|---|
| 79 | RTGCPTR GCRegion = pReq->aRegions[i].GCRegionAddr;
|
|---|
| 80 | uint32_t cbRegion = pReq->aRegions[i].cbRegion & ~0xfff;
|
|---|
| 81 |
|
|---|
| 82 | while (cbRegion)
|
|---|
| 83 | {
|
|---|
| 84 | RTGCPHYS GCPhys;
|
|---|
| 85 | uint64_t fFlags;
|
|---|
| 86 |
|
|---|
| 87 | rc = PGMGstGetPage(pVCpu, GCRegion, &GCPhys, &fFlags);
|
|---|
| 88 | if ( rc == VINF_SUCCESS
|
|---|
| 89 | && !(fFlags & X86_PTE_RW))
|
|---|
| 90 | {
|
|---|
| 91 | PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, GCPhys);
|
|---|
| 92 | if ( pPage
|
|---|
| 93 | && !PGM_PAGE_IS_SHARED(pPage))
|
|---|
| 94 | {
|
|---|
| 95 | cFlushedPages++;
|
|---|
| 96 | }
|
|---|
| 97 | }
|
|---|
| 98 |
|
|---|
| 99 | GCRegion += PAGE_SIZE;
|
|---|
| 100 | cbRegion -= PAGE_SIZE;
|
|---|
| 101 | }
|
|---|
| 102 | }
|
|---|
| 103 |
|
|---|
| 104 | if (cFlushedPages > 32)
|
|---|
| 105 | rc = VINF_SUCCESS; /* force recheck below */
|
|---|
| 106 | }
|
|---|
| 107 | /* Full (re)check needed? */
|
|---|
| 108 | if (rc == VINF_SUCCESS)
|
|---|
| 109 | {
|
|---|
| 110 | pReq->Hdr.u32Magic = SUPVMMR0REQHDR_MAGIC;
|
|---|
| 111 | pReq->Hdr.cbReq = sizeof(*pReq);
|
|---|
| 112 |
|
|---|
| 113 | /* We must stall other VCPUs as we'd otherwise have to send IPI flush commands for every single change we make. */
|
|---|
| 114 | rc = VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, pgmR3SharedModuleRegRendezvous, pReq);
|
|---|
| 115 | AssertRC(rc);
|
|---|
| 116 | }
|
|---|
| 117 | RTMemFree(pReq);
|
|---|
| 118 | return;
|
|---|
| 119 | }
|
|---|
| 120 | #endif
|
|---|
| 121 |
|
|---|
| 122 | /**
|
|---|
| 123 | * Registers a new shared module for the VM
|
|---|
| 124 | *
|
|---|
| 125 | * @returns VBox status code.
|
|---|
| 126 | * @param pVM VM handle
|
|---|
| 127 | * @param pszModuleName Module name
|
|---|
| 128 | * @param pszVersion Module version
|
|---|
| 129 | * @param GCBaseAddr Module base address
|
|---|
| 130 | * @param cbModule Module size
|
|---|
| 131 | * @param cRegions Number of shared region descriptors
|
|---|
| 132 | * @param pRegions Shared region(s)
|
|---|
| 133 | */
|
|---|
| 134 | VMMR3DECL(int) PGMR3SharedModuleRegister(PVM pVM, char *pszModuleName, char *pszVersion, RTGCPTR GCBaseAddr, uint32_t cbModule,
|
|---|
| 135 | unsigned cRegions, VMMDEVSHAREDREGIONDESC *pRegions)
|
|---|
| 136 | {
|
|---|
| 137 | #ifdef VBOX_WITH_PAGE_SHARING
|
|---|
| 138 | PGMMREGISTERSHAREDMODULEREQ pReq;
|
|---|
| 139 |
|
|---|
| 140 | /* Sanity check. */
|
|---|
| 141 | AssertReturn(cRegions < VMMDEVSHAREDREGIONDESC_MAX, VERR_INVALID_PARAMETER);
|
|---|
| 142 |
|
|---|
| 143 | pReq = (PGMMREGISTERSHAREDMODULEREQ)RTMemAllocZ(RT_OFFSETOF(GMMREGISTERSHAREDMODULEREQ, aRegions[cRegions]));
|
|---|
| 144 | AssertReturn(pReq, VERR_NO_MEMORY);
|
|---|
| 145 |
|
|---|
| 146 | pReq->GCBaseAddr = GCBaseAddr;
|
|---|
| 147 | pReq->cbModule = cbModule;
|
|---|
| 148 | pReq->cRegions = cRegions;
|
|---|
| 149 | for (unsigned i = 0; i < cRegions; i++)
|
|---|
| 150 | pReq->aRegions[i] = pRegions[i];
|
|---|
| 151 |
|
|---|
| 152 | if ( RTStrCopy(pReq->szName, sizeof(pReq->szName), pszModuleName) != VINF_SUCCESS
|
|---|
| 153 | || RTStrCopy(pReq->szVersion, sizeof(pReq->szVersion), pszVersion) != VINF_SUCCESS)
|
|---|
| 154 | {
|
|---|
| 155 | RTMemFree(pReq);
|
|---|
| 156 | return VERR_BUFFER_OVERFLOW;
|
|---|
| 157 | }
|
|---|
| 158 |
|
|---|
| 159 | /* Queue the actual registration as we are under the IOM lock right now. Perform this operation on the way out. */
|
|---|
| 160 | return VMR3ReqCallNoWait(pVM, VMMGetCpuId(pVM), (PFNRT)pgmR3SharedModuleRegisterHelper, 2, pVM, pReq);
|
|---|
| 161 | #else
|
|---|
| 162 | return VERR_NOT_IMPLEMENTED;
|
|---|
| 163 | #endif
|
|---|
| 164 | }
|
|---|
| 165 |
|
|---|
| 166 |
|
|---|
| 167 | #ifdef VBOX_WITH_PAGE_SHARING
|
|---|
| 168 | /**
|
|---|
| 169 | * Shared module unregistration helper (called on the way out).
|
|---|
| 170 | *
|
|---|
| 171 | * @param pVM The VM handle.
|
|---|
| 172 | * @param pReq Unregistration request info
|
|---|
| 173 | */
|
|---|
| 174 | static DECLCALLBACK(void) pgmR3SharedModuleUnregisterHelper(PVM pVM, PGMMREGISTERSHAREDMODULEREQ pReq)
|
|---|
| 175 | {
|
|---|
| 176 | int rc;
|
|---|
| 177 |
|
|---|
| 178 | rc = GMMR3UnregisterSharedModule(pVM, pReq);
|
|---|
| 179 | RTMemFree(pReq);
|
|---|
| 180 | return;
|
|---|
| 181 | }
|
|---|
| 182 | #endif
|
|---|
| 183 |
|
|---|
| 184 | /**
|
|---|
| 185 | * Unregisters a shared module for the VM
|
|---|
| 186 | *
|
|---|
| 187 | * @returns VBox status code.
|
|---|
| 188 | * @param pVM VM handle
|
|---|
| 189 | * @param pszModuleName Module name
|
|---|
| 190 | * @param pszVersion Module version
|
|---|
| 191 | * @param GCBaseAddr Module base address
|
|---|
| 192 | * @param cbModule Module size
|
|---|
| 193 | */
|
|---|
| 194 | VMMR3DECL(int) PGMR3SharedModuleUnregister(PVM pVM, char *pszModuleName, char *pszVersion, RTGCPTR GCBaseAddr, uint32_t cbModule)
|
|---|
| 195 | {
|
|---|
| 196 | #ifdef VBOX_WITH_PAGE_SHARING
|
|---|
| 197 | PGMMUNREGISTERSHAREDMODULEREQ pReq;
|
|---|
| 198 |
|
|---|
| 199 | pReq = (PGMMUNREGISTERSHAREDMODULEREQ)RTMemAllocZ(sizeof(*pReq));
|
|---|
| 200 | AssertReturn(pReq, VERR_NO_MEMORY);
|
|---|
| 201 |
|
|---|
| 202 | pReq->GCBaseAddr = GCBaseAddr;
|
|---|
| 203 | pReq->cbModule = cbModule;
|
|---|
| 204 |
|
|---|
| 205 | if ( RTStrCopy(pReq->szName, sizeof(pReq->szName), pszModuleName) != VINF_SUCCESS
|
|---|
| 206 | || RTStrCopy(pReq->szVersion, sizeof(pReq->szVersion), pszVersion) != VINF_SUCCESS)
|
|---|
| 207 | {
|
|---|
| 208 | return VERR_BUFFER_OVERFLOW;
|
|---|
| 209 | }
|
|---|
| 210 | /* Queue the actual registration as we are under the IOM lock right now. Perform this operation on the way out. */
|
|---|
| 211 | return VMR3ReqCallNoWait(pVM, VMMGetCpuId(pVM), (PFNRT)pgmR3SharedModuleUnregisterHelper, 2, pVM, pReq);
|
|---|
| 212 | #else
|
|---|
| 213 | return VERR_NOT_IMPLEMENTED;
|
|---|
| 214 | #endif
|
|---|
| 215 | }
|
|---|
