1 | /* $Id: PGMSharedPage.cpp 39084 2011-10-22 00:37:15Z 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) 2006-2011 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_SHARED
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23 | #include <VBox/vmm/pgm.h>
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24 | #include <VBox/vmm/stam.h>
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25 | #include "PGMInternal.h"
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26 | #include <VBox/vmm/vm.h>
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27 | #include <VBox/sup.h>
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28 | #include <VBox/param.h>
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29 | #include <VBox/err.h>
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30 | #include <VBox/log.h>
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31 | #include <iprt/asm.h>
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32 | #include <iprt/assert.h>
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33 | #include <iprt/mem.h>
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34 | #include <iprt/string.h>
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35 |
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36 | #include "PGMInline.h"
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37 |
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38 |
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39 | /*******************************************************************************
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40 | * Global Variables *
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41 | *******************************************************************************/
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42 | #if defined(VBOX_WITH_PAGE_SHARING) && defined(VBOX_STRICT)
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43 | /** Keep a copy of all registered shared modules for the .pgmcheckduppages debugger command. */
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44 | static PGMMREGISTERSHAREDMODULEREQ g_apSharedModules[512] = {0};
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45 | static unsigned g_cSharedModules = 0;
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46 | #endif
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47 |
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48 |
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49 | /**
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50 | * Registers a new shared module for the VM
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51 | *
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52 | * @returns VBox status code.
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53 | * @param pVM VM handle
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54 | * @param enmGuestOS Guest OS type
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55 | * @param pszModuleName Module name
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56 | * @param pszVersion Module version
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57 | * @param GCBaseAddr Module base address
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58 | * @param cbModule Module size
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59 | * @param cRegions Number of shared region descriptors
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60 | * @param pRegions Shared region(s)
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61 | */
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62 | VMMR3DECL(int) PGMR3SharedModuleRegister(PVM pVM, VBOXOSFAMILY enmGuestOS, char *pszModuleName, char *pszVersion,
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63 | RTGCPTR GCBaseAddr, uint32_t cbModule, unsigned cRegions,
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64 | VMMDEVSHAREDREGIONDESC *pRegions)
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65 | {
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66 | #ifdef VBOX_WITH_PAGE_SHARING
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67 | Log(("PGMR3SharedModuleRegister family=%d name=%s version=%s base=%RGv size=%x cRegions=%d\n", enmGuestOS, pszModuleName, pszVersion, GCBaseAddr, cbModule, cRegions));
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68 |
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69 | /* Sanity check. */
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70 | AssertReturn(cRegions < VMMDEVSHAREDREGIONDESC_MAX, VERR_INVALID_PARAMETER);
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71 |
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72 | PGMMREGISTERSHAREDMODULEREQ pReq;
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73 | pReq = (PGMMREGISTERSHAREDMODULEREQ)RTMemAllocZ(RT_OFFSETOF(GMMREGISTERSHAREDMODULEREQ, aRegions[cRegions]));
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74 | AssertReturn(pReq, VERR_NO_MEMORY);
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75 |
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76 | pReq->enmGuestOS = enmGuestOS;
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77 | pReq->GCBaseAddr = GCBaseAddr;
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78 | pReq->cbModule = cbModule;
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79 | pReq->cRegions = cRegions;
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80 | for (unsigned i = 0; i < cRegions; i++)
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81 | pReq->aRegions[i] = pRegions[i];
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82 |
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83 | if ( RTStrCopy(pReq->szName, sizeof(pReq->szName), pszModuleName) != VINF_SUCCESS
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84 | || RTStrCopy(pReq->szVersion, sizeof(pReq->szVersion), pszVersion) != VINF_SUCCESS)
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85 | {
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86 | RTMemFree(pReq);
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87 | return VERR_BUFFER_OVERFLOW;
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88 | }
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89 |
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90 | int rc = GMMR3RegisterSharedModule(pVM, pReq);
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91 | # ifdef VBOX_STRICT
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92 | if (rc == VINF_SUCCESS)
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93 | {
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94 | PGMMREGISTERSHAREDMODULEREQ *ppSharedModule = NULL;
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95 |
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96 | if (g_cSharedModules < RT_ELEMENTS(g_apSharedModules))
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97 | {
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98 | for (unsigned i = 0; i < RT_ELEMENTS(g_apSharedModules); i++)
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99 | {
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100 | if (g_apSharedModules[i] == NULL)
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101 | {
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102 | ppSharedModule = &g_apSharedModules[i];
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103 | break;
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104 | }
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105 | }
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106 | Assert(ppSharedModule);
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107 |
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108 | if (ppSharedModule)
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109 | {
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110 | size_t const cbSharedModule = RT_OFFSETOF(GMMREGISTERSHAREDMODULEREQ, aRegions[cRegions]);
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111 | *ppSharedModule = (PGMMREGISTERSHAREDMODULEREQ)RTMemDup(pReq, cbSharedModule);
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112 | g_cSharedModules++;
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113 | }
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114 | }
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115 | }
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116 | # endif /* VBOX_STRICT */
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117 |
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118 | RTMemFree(pReq);
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119 | Assert(rc == VINF_SUCCESS || rc == VINF_PGM_SHARED_MODULE_COLLISION || rc == VINF_PGM_SHARED_MODULE_ALREADY_REGISTERED);
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120 | if (RT_FAILURE(rc))
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121 | return rc;
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122 |
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123 | return VINF_SUCCESS;
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124 | #else /* !VBOX_WITH_PAGE_SHARING */
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125 |
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126 | NOREF(pVM); NOREF(enmGuestOS); NOREF(pszModuleName); NOREF(pszVersion); NOREF(GCBaseAddr);
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127 | NOREF(cbModule); NOREF(cRegions); NOREF(pRegions);
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128 | return VERR_NOT_IMPLEMENTED;
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129 | #endif /* !VBOX_WITH_PAGE_SHARING */
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130 | }
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131 |
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132 |
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133 | /**
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134 | * Unregisters a shared module for the VM
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135 | *
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136 | * @returns VBox status code.
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137 | * @param pVM VM handle
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138 | * @param pszModuleName Module name
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139 | * @param pszVersion Module version
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140 | * @param GCBaseAddr Module base address
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141 | * @param cbModule Module size
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142 | */
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143 | VMMR3DECL(int) PGMR3SharedModuleUnregister(PVM pVM, char *pszModuleName, char *pszVersion, RTGCPTR GCBaseAddr, uint32_t cbModule)
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144 | {
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145 | #ifdef VBOX_WITH_PAGE_SHARING
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146 | PGMMUNREGISTERSHAREDMODULEREQ pReq;
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147 |
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148 | Log(("PGMR3SharedModuleUnregister name=%s version=%s base=%RGv size=%x\n", pszModuleName, pszVersion, GCBaseAddr, cbModule));
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149 |
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150 | pReq = (PGMMUNREGISTERSHAREDMODULEREQ)RTMemAllocZ(sizeof(*pReq));
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151 | AssertReturn(pReq, VERR_NO_MEMORY);
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152 |
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153 | pReq->GCBaseAddr = GCBaseAddr;
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154 | pReq->cbModule = cbModule;
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155 |
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156 | if ( RTStrCopy(pReq->szName, sizeof(pReq->szName), pszModuleName) != VINF_SUCCESS
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157 | || RTStrCopy(pReq->szVersion, sizeof(pReq->szVersion), pszVersion) != VINF_SUCCESS)
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158 | {
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159 | RTMemFree(pReq);
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160 | return VERR_BUFFER_OVERFLOW;
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161 | }
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162 | int rc = GMMR3UnregisterSharedModule(pVM, pReq);
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163 | RTMemFree(pReq);
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164 |
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165 | # ifdef VBOX_STRICT
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166 | for (unsigned i = 0; i < g_cSharedModules; i++)
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167 | {
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168 | if ( g_apSharedModules[i]
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169 | && !strcmp(g_apSharedModules[i]->szName, pszModuleName)
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170 | && !strcmp(g_apSharedModules[i]->szVersion, pszVersion))
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171 | {
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172 | RTMemFree(g_apSharedModules[i]);
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173 | g_apSharedModules[i] = NULL;
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174 | g_cSharedModules--;
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175 | break;
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176 | }
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177 | }
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178 | # endif /* VBOX_STRICT */
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179 | return rc;
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180 | #else /* !VBOX_WITH_PAGE_SHARING */
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181 |
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182 | NOREF(pVM); NOREF(pszModuleName); NOREF(pszVersion); NOREF(GCBaseAddr); NOREF(cbModule);
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183 | return VERR_NOT_IMPLEMENTED;
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184 | #endif /* !VBOX_WITH_PAGE_SHARING */
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185 | }
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186 |
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187 | #ifdef VBOX_WITH_PAGE_SHARING
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188 |
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189 | /**
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190 | * Rendezvous callback that will be called once.
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191 | *
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192 | * @returns VBox strict status code.
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193 | * @param pVM VM handle.
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194 | * @param pVCpu The VMCPU handle for the calling EMT.
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195 | * @param pvUser Not used;
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196 | */
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197 | static DECLCALLBACK(VBOXSTRICTRC) pgmR3SharedModuleRegRendezvous(PVM pVM, PVMCPU pVCpu, void *pvUser)
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198 | {
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199 | VMCPUID idCpu = *(VMCPUID *)pvUser;
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200 |
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201 | /* Execute on the VCPU that issued the original request to make sure we're in the right cr3 context. */
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202 | if (pVCpu->idCpu != idCpu)
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203 | {
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204 | Assert(pVM->cCpus > 1);
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205 | return VINF_SUCCESS;
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206 | }
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207 |
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208 | /* Flush all pending handy page operations before changing any shared page assignments. */
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209 | int rc = PGMR3PhysAllocateHandyPages(pVM);
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210 | AssertRC(rc);
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211 |
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212 | /* Lock it here as we can't deal with busy locks in this ring-0 path. */
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213 | pgmLock(pVM);
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214 | rc = GMMR3CheckSharedModules(pVM);
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215 | pgmUnlock(pVM);
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216 | AssertLogRelRC(rc);
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217 | return rc;
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218 | }
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219 |
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220 | /**
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221 | * Shared module check helper (called on the way out).
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222 | *
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223 | * @param pVM The VM handle.
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224 | * @param VMCPUID VCPU id
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225 | */
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226 | static DECLCALLBACK(void) pgmR3CheckSharedModulesHelper(PVM pVM, VMCPUID idCpu)
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227 | {
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228 | /* 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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229 | int rc = VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONE_BY_ONE, pgmR3SharedModuleRegRendezvous, &idCpu);
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230 | AssertRCSuccess(rc);
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231 | }
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232 |
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233 | #endif /* !VBOX_WITH_PAGE_SHARING */
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234 |
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235 | /**
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236 | * Check all registered modules for changes.
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237 | *
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238 | * @returns VBox status code.
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239 | * @param pVM VM handle
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240 | */
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241 | VMMR3DECL(int) PGMR3SharedModuleCheckAll(PVM pVM)
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242 | {
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243 | #ifdef VBOX_WITH_PAGE_SHARING
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244 | /* Queue the actual registration as we are under the IOM lock right now. Perform this operation on the way out. */
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245 | return VMR3ReqCallNoWait(pVM, VMCPUID_ANY_QUEUE, (PFNRT)pgmR3CheckSharedModulesHelper, 2, pVM, VMMGetCpuId(pVM));
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246 | #else
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247 | NOREF(pVM);
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248 | return VERR_NOT_IMPLEMENTED;
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249 | #endif
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250 | }
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251 |
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252 |
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253 | /**
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254 | * Query the state of a page in a shared module
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255 | *
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256 | * @returns VBox status code.
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257 | * @param pVM VM handle.
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258 | * @param GCPtrPage Page address.
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259 | * @param pfShared Shared status (out).
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260 | * @param pfPageFlags Page flags (out).
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261 | */
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262 | VMMR3DECL(int) PGMR3SharedModuleGetPageState(PVM pVM, RTGCPTR GCPtrPage, bool *pfShared, uint64_t *pfPageFlags)
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263 | {
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264 | #if defined(VBOX_WITH_PAGE_SHARING) && defined(DEBUG)
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265 | /* Debug only API for the page fusion testcase. */
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266 | RTGCPHYS GCPhys;
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267 | uint64_t fFlags;
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268 |
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269 | pgmLock(pVM);
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270 |
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271 | int rc = PGMGstGetPage(VMMGetCpu(pVM), GCPtrPage, &fFlags, &GCPhys);
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272 | switch (rc)
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273 | {
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274 | case VINF_SUCCESS:
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275 | {
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276 | PPGMPAGE pPage = pgmPhysGetPage(pVM, GCPhys);
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277 | if (pPage)
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278 | {
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279 | *pfShared = PGM_PAGE_IS_SHARED(pPage);
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280 | *pfPageFlags = fFlags;
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281 | }
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282 | else
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283 | rc = VERR_PGM_INVALID_GC_PHYSICAL_ADDRESS;
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284 | break;
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285 | }
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286 | case VERR_PAGE_NOT_PRESENT:
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287 | case VERR_PAGE_TABLE_NOT_PRESENT:
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288 | case VERR_PAGE_MAP_LEVEL4_NOT_PRESENT:
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289 | case VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT:
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290 | *pfShared = false;
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291 | *pfPageFlags = 0;
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292 | rc = VINF_SUCCESS;
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293 | break;
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294 |
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295 | default:
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296 | break;
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297 | }
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298 |
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299 | pgmUnlock(pVM);
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300 | return rc;
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301 | #else
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302 | NOREF(pVM); NOREF(GCPtrPage); NOREF(pfShared); NOREF(pfPageFlags);
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303 | return VERR_NOT_IMPLEMENTED;
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304 | #endif
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305 | }
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306 |
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307 | #if defined(VBOX_WITH_PAGE_SHARING) && defined(VBOX_STRICT)
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308 |
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309 | /**
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310 | * The '.pgmcheckduppages' command.
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311 | *
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312 | * @returns VBox status.
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313 | * @param pCmd Pointer to the command descriptor (as registered).
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314 | * @param pCmdHlp Pointer to command helper functions.
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315 | * @param pVM Pointer to the current VM (if any).
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316 | * @param paArgs Pointer to (readonly) array of arguments.
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317 | * @param cArgs Number of arguments in the array.
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318 | */
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319 | DECLCALLBACK(int) pgmR3CmdCheckDuplicatePages(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs)
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320 | {
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321 | unsigned cBallooned = 0;
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322 | unsigned cShared = 0;
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323 | unsigned cZero = 0;
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324 | unsigned cUnique = 0;
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325 | unsigned cDuplicate = 0;
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326 | unsigned cAllocZero = 0;
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327 | unsigned cPages = 0;
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328 | NOREF(pCmd); NOREF(paArgs); NOREF(cArgs);
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329 |
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330 | pgmLock(pVM);
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331 |
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332 | for (PPGMRAMRANGE pRam = pVM->pgm.s.pRamRangesXR3; pRam; pRam = pRam->pNextR3)
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333 | {
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334 | PPGMPAGE pPage = &pRam->aPages[0];
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335 | RTGCPHYS GCPhys = pRam->GCPhys;
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336 | uint32_t cLeft = pRam->cb >> PAGE_SHIFT;
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337 | while (cLeft-- > 0)
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338 | {
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339 | if (PGM_PAGE_GET_TYPE(pPage) == PGMPAGETYPE_RAM)
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340 | {
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341 | switch (PGM_PAGE_GET_STATE(pPage))
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342 | {
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343 | case PGM_PAGE_STATE_ZERO:
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344 | cZero++;
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345 | break;
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346 |
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347 | case PGM_PAGE_STATE_BALLOONED:
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348 | cBallooned++;
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349 | break;
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350 |
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351 | case PGM_PAGE_STATE_SHARED:
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352 | cShared++;
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353 | break;
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354 |
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355 | case PGM_PAGE_STATE_ALLOCATED:
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356 | case PGM_PAGE_STATE_WRITE_MONITORED:
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357 | {
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358 | /* Check if the page was allocated, but completely zero. */
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359 | PGMPAGEMAPLOCK PgMpLck;
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360 | const void *pvPage;
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361 | int rc = pgmPhysGCPhys2CCPtrInternalReadOnly(pVM, pPage, GCPhys, &pvPage, &PgMpLck);
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362 | if ( RT_SUCCESS(rc)
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363 | && ASMMemIsZeroPage(pvPage))
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364 | cAllocZero++;
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365 | else if (GMMR3IsDuplicatePage(pVM, PGM_PAGE_GET_PAGEID(pPage)))
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366 | cDuplicate++;
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367 | else
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368 | cUnique++;
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369 | if (RT_SUCCESS(rc))
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370 | pgmPhysReleaseInternalPageMappingLock(pVM, &PgMpLck);
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371 | break;
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372 | }
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373 |
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374 | default:
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375 | AssertFailed();
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376 | break;
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377 | }
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378 | }
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379 |
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380 | /* next */
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381 | pPage++;
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382 | GCPhys += PAGE_SIZE;
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383 | cPages++;
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384 | /* Give some feedback for every processed megabyte. */
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385 | if ((cPages & 0x7f) == 0)
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386 | pCmdHlp->pfnPrintf(pCmdHlp, NULL, ".");
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387 | }
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388 | }
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389 | pgmUnlock(pVM);
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390 |
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391 | pCmdHlp->pfnPrintf(pCmdHlp, NULL, "\nNumber of zero pages %08x (%d MB)\n", cZero, cZero / 256);
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392 | pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of alloczero pages %08x (%d MB)\n", cAllocZero, cAllocZero / 256);
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393 | pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of ballooned pages %08x (%d MB)\n", cBallooned, cBallooned / 256);
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394 | pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of shared pages %08x (%d MB)\n", cShared, cShared / 256);
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395 | pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of unique pages %08x (%d MB)\n", cUnique, cUnique / 256);
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396 | pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Number of duplicate pages %08x (%d MB)\n", cDuplicate, cDuplicate / 256);
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397 | return VINF_SUCCESS;
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398 | }
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399 |
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400 |
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401 | /**
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402 | * The '.pgmsharedmodules' command.
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403 | *
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404 | * @returns VBox status.
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405 | * @param pCmd Pointer to the command descriptor (as registered).
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406 | * @param pCmdHlp Pointer to command helper functions.
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407 | * @param pVM Pointer to the current VM (if any).
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408 | * @param paArgs Pointer to (readonly) array of arguments.
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409 | * @param cArgs Number of arguments in the array.
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410 | */
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411 | DECLCALLBACK(int) pgmR3CmdShowSharedModules(PCDBGCCMD pCmd, PDBGCCMDHLP pCmdHlp, PVM pVM, PCDBGCVAR paArgs, unsigned cArgs)
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412 | {
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413 | NOREF(pCmd); NOREF(paArgs); NOREF(cArgs);
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414 |
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415 | pgmLock(pVM);
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416 | for (unsigned i = 0; i < RT_ELEMENTS(g_apSharedModules); i++)
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417 | {
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418 | if (g_apSharedModules[i])
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419 | {
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420 | pCmdHlp->pfnPrintf(pCmdHlp, NULL, "Shared module %s (%s):\n", g_apSharedModules[i]->szName, g_apSharedModules[i]->szVersion);
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421 | for (unsigned j = 0; j < g_apSharedModules[i]->cRegions; j++)
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422 | pCmdHlp->pfnPrintf(pCmdHlp, NULL, "--- Region %d: base %RGv size %x\n", j, g_apSharedModules[i]->aRegions[j].GCRegionAddr, g_apSharedModules[i]->aRegions[j].cbRegion);
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423 | }
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424 | }
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425 | pgmUnlock(pVM);
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426 |
|
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427 | return VINF_SUCCESS;
|
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428 | }
|
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429 |
|
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430 | #endif /* VBOX_STRICT && VBOX_WITH_PAGE_SHARING */
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