1 | /* $Id: VMMAll.cpp 46326 2013-05-30 12:16:53Z vboxsync $ */
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2 | /** @file
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3 | * VMM All Contexts.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2013 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_VMM
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23 | #include <VBox/vmm/vmm.h>
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24 | #include "VMMInternal.h"
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25 | #include <VBox/vmm/vm.h>
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26 | #include <VBox/vmm/vmcpuset.h>
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27 | #include <VBox/param.h>
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28 | #include <iprt/thread.h>
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29 | #include <iprt/mp.h>
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30 |
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31 |
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32 | /*******************************************************************************
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33 | * Global Variables *
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34 | *******************************************************************************/
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35 | /** User counter for the vmmInitFormatTypes function (pro forma). */
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36 | static volatile uint32_t g_cFormatTypeUsers = 0;
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37 |
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38 |
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39 | /**
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40 | * Helper that formats a decimal number in the range 0..9999.
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41 | *
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42 | * @returns The length of the formatted number.
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43 | * @param pszBuf Output buffer with sufficient space.
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44 | * @param uNum The number to format.
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45 | */
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46 | static unsigned vmmFormatTypeShortNumber(char *pszBuf, uint32_t uNumber)
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47 | {
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48 | unsigned off = 0;
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49 | if (uNumber >= 10)
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50 | {
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51 | if (uNumber >= 100)
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52 | {
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53 | if (uNumber >= 1000)
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54 | pszBuf[off++] = ((uNumber / 1000) % 10) + '0';
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55 | pszBuf[off++] = ((uNumber / 100) % 10) + '0';
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56 | }
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57 | pszBuf[off++] = ((uNumber / 10) % 10) + '0';
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58 | }
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59 | pszBuf[off++] = (uNumber % 10) + '0';
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60 | pszBuf[off] = '\0';
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61 | return off;
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62 | }
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63 |
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64 |
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65 | /**
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66 | * @callback_method_impl{FNRTSTRFORMATTYPE, vmsetcpu}
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67 | */
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68 | static DECLCALLBACK(size_t) vmmFormatTypeVmCpuSet(PFNRTSTROUTPUT pfnOutput, void *pvArgOutput,
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69 | const char *pszType, void const *pvValue,
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70 | int cchWidth, int cchPrecision, unsigned fFlags,
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71 | void *pvUser)
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72 | {
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73 | PCVMCPUSET pSet = (PCVMCPUSET)pvValue;
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74 | uint32_t cCpus = 0;
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75 | uint32_t iCpu = RT_ELEMENTS(pSet->au32Bitmap) * 32;
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76 | while (iCpu--)
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77 | if (VMCPUSET_IS_PRESENT(pSet, iCpu))
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78 | cCpus++;
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79 |
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80 | char szTmp[32];
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81 | AssertCompile(RT_ELEMENTS(pSet->au32Bitmap) * 32 < 999);
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82 | if (cCpus == 1)
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83 | {
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84 | iCpu = RT_ELEMENTS(pSet->au32Bitmap) * 32;
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85 | while (iCpu--)
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86 | if (VMCPUSET_IS_PRESENT(pSet, iCpu))
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87 | {
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88 | szTmp[0] = 'c';
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89 | szTmp[1] = 'p';
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90 | szTmp[2] = 'u';
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91 | return pfnOutput(pvArgOutput, szTmp, 3 + vmmFormatTypeShortNumber(&szTmp[3], iCpu));
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92 | }
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93 | cCpus = 0;
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94 | }
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95 | if (cCpus == 0)
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96 | return pfnOutput(pvArgOutput, RT_STR_TUPLE("<empty>"));
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97 | if (cCpus == RT_ELEMENTS(pSet->au32Bitmap) * 32)
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98 | return pfnOutput(pvArgOutput, RT_STR_TUPLE("<full>"));
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99 |
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100 | /*
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101 | * Print cpus that are present: {1,2,7,9 ... }
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102 | */
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103 | size_t cchRet = pfnOutput(pvArgOutput, "{", 1);
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104 |
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105 | cCpus = 0;
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106 | iCpu = 0;
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107 | while (iCpu < RT_ELEMENTS(pSet->au32Bitmap) * 32)
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108 | {
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109 | if (VMCPUSET_IS_PRESENT(pSet, iCpu))
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110 | {
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111 | /* Output the first cpu number. */
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112 | int off = 0;
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113 | if (cCpus != 0)
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114 | szTmp[off++] = ',';
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115 | off += vmmFormatTypeShortNumber(&szTmp[off], iCpu);
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116 |
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117 | /* Check for sequence. */
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118 | uint32_t const iStart = ++iCpu;
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119 | while ( iCpu < RT_ELEMENTS(pSet->au32Bitmap) * 32
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120 | && VMCPUSET_IS_PRESENT(pSet, iCpu))
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121 | iCpu++;
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122 | if (iCpu != iStart)
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123 | {
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124 | szTmp[off++] = '-';
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125 | off += vmmFormatTypeShortNumber(&szTmp[off], iCpu);
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126 | }
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127 |
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128 | /* Terminate and output. */
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129 | szTmp[off] = '\0';
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130 | cchRet += pfnOutput(pvArgOutput, szTmp, off);
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131 | }
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132 | iCpu++;
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133 | }
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134 |
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135 | cchRet += pfnOutput(pvArgOutput, "}", 1);
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136 | NOREF(pvUser);
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137 | return cchRet;
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138 | }
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139 |
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140 |
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141 | /**
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142 | * Registers the VMM wide format types.
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143 | *
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144 | * Called by VMMR3Init, VMMR0Init and VMMRCInit.
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145 | */
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146 | int vmmInitFormatTypes(void)
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147 | {
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148 | int rc = VINF_SUCCESS;
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149 | if (ASMAtomicIncU32(&g_cFormatTypeUsers) == 1)
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150 | rc = RTStrFormatTypeRegister("vmcpuset", vmmFormatTypeVmCpuSet, NULL);
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151 | return rc;
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152 | }
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153 |
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154 |
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155 | #ifndef IN_RC
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156 | /**
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157 | * Counterpart to vmmInitFormatTypes, called by VMMR3Term and VMMR0Term.
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158 | */
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159 | void vmmTermFormatTypes(void)
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160 | {
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161 | if (ASMAtomicDecU32(&g_cFormatTypeUsers) == 0)
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162 | RTStrFormatTypeDeregister("vmcpuset");
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163 | }
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164 | #endif
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165 |
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166 |
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167 | /**
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168 | * Gets the bottom of the hypervisor stack - RC Ptr.
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169 | *
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170 | * (The returned address is not actually writable, only after it's decremented
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171 | * by a push/ret/whatever does it become writable.)
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172 | *
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173 | * @returns bottom of the stack.
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174 | * @param pVCpu Pointer to the VMCPU.
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175 | */
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176 | VMM_INT_DECL(RTRCPTR) VMMGetStackRC(PVMCPU pVCpu)
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177 | {
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178 | return (RTRCPTR)pVCpu->vmm.s.pbEMTStackBottomRC;
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179 | }
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180 |
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181 |
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182 | /**
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183 | * Gets the ID of the virtual CPU associated with the calling thread.
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184 | *
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185 | * @returns The CPU ID. NIL_VMCPUID if the thread isn't an EMT.
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186 | *
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187 | * @param pVM Pointer to the VM.
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188 | * @internal
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189 | */
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190 | VMMDECL(VMCPUID) VMMGetCpuId(PVM pVM)
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191 | {
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192 | #if defined(IN_RING3)
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193 | return VMR3GetVMCPUId(pVM);
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194 |
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195 | #elif defined(IN_RING0)
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196 | if (pVM->cCpus == 1)
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197 | return 0;
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198 |
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199 | /* Search first by host cpu id (most common case)
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200 | * and then by native thread id (page fusion case).
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201 | */
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202 | /* RTMpCpuId had better be cheap. */
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203 | RTCPUID idHostCpu = RTMpCpuId();
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204 |
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205 | /** @todo optimize for large number of VCPUs when that becomes more common. */
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206 | for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
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207 | {
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208 | PVMCPU pVCpu = &pVM->aCpus[idCpu];
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209 |
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210 | if (pVCpu->idHostCpu == idHostCpu)
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211 | return pVCpu->idCpu;
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212 | }
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213 |
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214 | /* RTThreadGetNativeSelf had better be cheap. */
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215 | RTNATIVETHREAD hThread = RTThreadNativeSelf();
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216 |
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217 | /** @todo optimize for large number of VCPUs when that becomes more common. */
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218 | for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
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219 | {
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220 | PVMCPU pVCpu = &pVM->aCpus[idCpu];
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221 |
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222 | if (pVCpu->hNativeThreadR0 == hThread)
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223 | return pVCpu->idCpu;
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224 | }
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225 | return NIL_VMCPUID;
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226 |
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227 | #else /* RC: Always EMT(0) */
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228 | NOREF(pVM);
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229 | return 0;
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230 | #endif
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231 | }
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232 |
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233 |
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234 | /**
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235 | * Returns the VMCPU of the calling EMT.
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236 | *
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237 | * @returns The VMCPU pointer. NULL if not an EMT.
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238 | *
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239 | * @param pVM Pointer to the VM.
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240 | * @internal
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241 | */
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242 | VMMDECL(PVMCPU) VMMGetCpu(PVM pVM)
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243 | {
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244 | #ifdef IN_RING3
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245 | VMCPUID idCpu = VMR3GetVMCPUId(pVM);
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246 | if (idCpu == NIL_VMCPUID)
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247 | return NULL;
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248 | Assert(idCpu < pVM->cCpus);
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249 | return &pVM->aCpus[idCpu];
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250 |
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251 | #elif defined(IN_RING0)
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252 | if (pVM->cCpus == 1)
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253 | return &pVM->aCpus[0];
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254 |
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255 | /* Search first by host cpu id (most common case)
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256 | * and then by native thread id (page fusion case).
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257 | */
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258 |
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259 | /* RTMpCpuId had better be cheap. */
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260 | RTCPUID idHostCpu = RTMpCpuId();
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261 |
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262 | /** @todo optimize for large number of VCPUs when that becomes more common. */
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263 | for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
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264 | {
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265 | PVMCPU pVCpu = &pVM->aCpus[idCpu];
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266 |
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267 | if (pVCpu->idHostCpu == idHostCpu)
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268 | return pVCpu;
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269 | }
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270 |
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271 | /* RTThreadGetNativeSelf had better be cheap. */
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272 | RTNATIVETHREAD hThread = RTThreadNativeSelf();
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273 |
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274 | /** @todo optimize for large number of VCPUs when that becomes more common. */
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275 | for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
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276 | {
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277 | PVMCPU pVCpu = &pVM->aCpus[idCpu];
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278 |
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279 | if (pVCpu->hNativeThreadR0 == hThread)
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280 | return pVCpu;
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281 | }
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282 | return NULL;
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283 |
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284 | #else /* RC: Always EMT(0) */
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285 | return &pVM->aCpus[0];
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286 | #endif /* IN_RING0 */
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287 | }
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288 |
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289 |
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290 | /**
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291 | * Returns the VMCPU of the first EMT thread.
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292 | *
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293 | * @returns The VMCPU pointer.
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294 | * @param pVM Pointer to the VM.
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295 | * @internal
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296 | */
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297 | VMMDECL(PVMCPU) VMMGetCpu0(PVM pVM)
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298 | {
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299 | Assert(pVM->cCpus == 1);
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300 | return &pVM->aCpus[0];
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301 | }
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302 |
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303 |
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304 | /**
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305 | * Returns the VMCPU of the specified virtual CPU.
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306 | *
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307 | * @returns The VMCPU pointer. NULL if idCpu is invalid.
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308 | *
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309 | * @param pVM Pointer to the VM.
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310 | * @param idCpu The ID of the virtual CPU.
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311 | * @internal
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312 | */
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313 | VMMDECL(PVMCPU) VMMGetCpuById(PVM pVM, RTCPUID idCpu)
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314 | {
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315 | AssertReturn(idCpu < pVM->cCpus, NULL);
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316 | return &pVM->aCpus[idCpu];
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317 | }
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318 |
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319 |
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320 | /**
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321 | * Gets the VBOX_SVN_REV.
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322 | *
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323 | * This is just to avoid having to compile a bunch of big files
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324 | * and requires less Makefile mess.
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325 | *
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326 | * @returns VBOX_SVN_REV.
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327 | */
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328 | VMM_INT_DECL(uint32_t) VMMGetSvnRev(void)
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329 | {
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330 | return VBOX_SVN_REV;
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331 | }
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332 |
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333 |
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334 | /**
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335 | * Queries the current switcher
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336 | *
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337 | * @returns active switcher
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338 | * @param pVM Pointer to the VM.
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339 | */
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340 | VMM_INT_DECL(VMMSWITCHER) VMMGetSwitcher(PVM pVM)
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341 | {
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342 | return pVM->vmm.s.enmSwitcher;
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343 | }
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344 |
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345 |
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346 | /**
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347 | * Checks whether we're in a ring-3 call or not.
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348 | *
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349 | * @returns true / false.
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350 | * @param pVCpu The caller's cross context VM structure.
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351 | * @thread EMT
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352 | */
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353 | VMM_INT_DECL(bool) VMMIsInRing3Call(PVMCPU pVCpu)
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354 | {
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355 | #ifdef RT_ARCH_X86
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356 | return pVCpu->vmm.s.CallRing3JmpBufR0.fInRing3Call;
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357 | #else
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358 | return pVCpu->vmm.s.CallRing3JmpBufR0.fInRing3Call;
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359 | #endif
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360 | }
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361 |
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