1 | /* $Id: IOMR0Mmio.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
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2 | /** @file
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3 | * IOM - Host Context Ring 0, MMIO.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2024 Oracle and/or its affiliates.
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8 | *
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9 | * This file is part of VirtualBox base platform packages, as
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10 | * available from https://www.virtualbox.org.
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11 | *
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12 | * This program is free software; you can redistribute it and/or
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13 | * modify it under the terms of the GNU General Public License
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14 | * as published by the Free Software Foundation, in version 3 of the
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15 | * License.
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16 | *
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17 | * This program is distributed in the hope that it will be useful, but
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18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | * General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | *
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25 | * SPDX-License-Identifier: GPL-3.0-only
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26 | */
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27 |
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28 |
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29 | /*********************************************************************************************************************************
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30 | * Header Files *
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31 | *********************************************************************************************************************************/
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32 | #define LOG_GROUP LOG_GROUP_IOM_MMIO
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33 | #include <VBox/vmm/iom.h>
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34 | #include "IOMInternal.h"
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35 | #include <VBox/vmm/pdmdev.h>
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36 | #include <VBox/vmm/vmcc.h>
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37 | #include <VBox/err.h>
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38 | #include <VBox/log.h>
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39 | #include <iprt/assert.h>
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40 | #include <iprt/mem.h>
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41 | #include <iprt/memobj.h>
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42 | #include <iprt/process.h>
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43 | #include <iprt/string.h>
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44 |
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45 |
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46 |
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47 | /**
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48 | * Initializes the MMIO related members.
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49 | *
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50 | * @param pGVM Pointer to the global VM structure.
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51 | */
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52 | void iomR0MmioInitPerVMData(PGVM pGVM)
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53 | {
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54 | pGVM->iomr0.s.hMmioMapObj = NIL_RTR0MEMOBJ;
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55 | pGVM->iomr0.s.hMmioMemObj = NIL_RTR0MEMOBJ;
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56 | #ifdef VBOX_WITH_STATISTICS
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57 | pGVM->iomr0.s.hMmioStatsMapObj = NIL_RTR0MEMOBJ;
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58 | pGVM->iomr0.s.hMmioStatsMemObj = NIL_RTR0MEMOBJ;
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59 | #endif
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60 | }
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61 |
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62 |
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63 | /**
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64 | * Cleans up MMIO related resources.
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65 | */
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66 | void iomR0MmioCleanupVM(PGVM pGVM)
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67 | {
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68 | RTR0MemObjFree(pGVM->iomr0.s.hMmioMapObj, true /*fFreeMappings*/);
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69 | pGVM->iomr0.s.hMmioMapObj = NIL_RTR0MEMOBJ;
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70 | RTR0MemObjFree(pGVM->iomr0.s.hMmioMemObj, true /*fFreeMappings*/);
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71 | pGVM->iomr0.s.hMmioMemObj = NIL_RTR0MEMOBJ;
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72 | #ifdef VBOX_WITH_STATISTICS
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73 | RTR0MemObjFree(pGVM->iomr0.s.hMmioStatsMapObj, true /*fFreeMappings*/);
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74 | pGVM->iomr0.s.hMmioStatsMapObj = NIL_RTR0MEMOBJ;
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75 | RTR0MemObjFree(pGVM->iomr0.s.hMmioStatsMemObj, true /*fFreeMappings*/);
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76 | pGVM->iomr0.s.hMmioStatsMemObj = NIL_RTR0MEMOBJ;
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77 | #endif
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78 | }
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79 |
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80 |
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81 | /**
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82 | * Implements PDMDEVHLPR0::pfnMmioSetUpContext.
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83 | *
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84 | * @param pGVM The global (ring-0) VM structure.
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85 | * @param pDevIns The device instance.
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86 | * @param hRegion The MMIO region handle (already registered in
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87 | * ring-3).
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88 | * @param pfnWrite The write handler callback, optional.
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89 | * @param pfnRead The read handler callback, optional.
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90 | * @param pfnFill The fill handler callback, optional.
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91 | * @param pvUser User argument for the callbacks.
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92 | * @thread EMT(0)
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93 | * @note Only callable at VM creation time.
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94 | */
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95 | VMMR0_INT_DECL(int) IOMR0MmioSetUpContext(PGVM pGVM, PPDMDEVINS pDevIns, IOMMMIOHANDLE hRegion, PFNIOMMMIONEWWRITE pfnWrite,
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96 | PFNIOMMMIONEWREAD pfnRead, PFNIOMMMIONEWFILL pfnFill, void *pvUser)
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97 | {
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98 | /*
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99 | * Validate input and state.
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100 | */
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101 | VM_ASSERT_EMT0_RETURN(pGVM, VERR_VM_THREAD_NOT_EMT);
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102 | VM_ASSERT_STATE_RETURN(pGVM, VMSTATE_CREATING, VERR_VM_INVALID_VM_STATE);
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103 | AssertReturn(hRegion < pGVM->iomr0.s.cMmioAlloc, VERR_IOM_INVALID_MMIO_HANDLE);
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104 | AssertReturn(hRegion < pGVM->iom.s.cMmioRegs, VERR_IOM_INVALID_MMIO_HANDLE);
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105 | AssertPtrReturn(pDevIns, VERR_INVALID_HANDLE);
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106 | AssertReturn(pDevIns->pDevInsForR3 != NIL_RTR3PTR && !(pDevIns->pDevInsForR3 & HOST_PAGE_OFFSET_MASK), VERR_INVALID_PARAMETER);
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107 | AssertReturn(pGVM->iomr0.s.paMmioRing3Regs[hRegion].pDevIns == pDevIns->pDevInsForR3, VERR_IOM_INVALID_MMIO_HANDLE);
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108 | AssertReturn(pGVM->iomr0.s.paMmioRegs[hRegion].pDevIns == NULL, VERR_WRONG_ORDER);
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109 | Assert(pGVM->iomr0.s.paMmioRegs[hRegion].idxSelf == hRegion);
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110 |
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111 | AssertReturn(pfnWrite || pfnRead || pfnFill, VERR_INVALID_PARAMETER);
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112 | AssertPtrNullReturn(pfnWrite, VERR_INVALID_POINTER);
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113 | AssertPtrNullReturn(pfnRead, VERR_INVALID_POINTER);
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114 | AssertPtrNullReturn(pfnFill, VERR_INVALID_POINTER);
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115 |
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116 | uint32_t const fFlags = pGVM->iomr0.s.paMmioRing3Regs[hRegion].fFlags;
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117 | RTGCPHYS const cbRegion = pGVM->iomr0.s.paMmioRing3Regs[hRegion].cbRegion;
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118 | AssertMsgReturn(cbRegion > 0 && cbRegion <= _1T, ("cbRegion=%#RGp\n", cbRegion), VERR_IOM_INVALID_MMIO_HANDLE);
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119 |
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120 | /*
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121 | * Do the job.
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122 | */
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123 | pGVM->iomr0.s.paMmioRegs[hRegion].cbRegion = cbRegion;
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124 | pGVM->iomr0.s.paMmioRegs[hRegion].pvUser = pvUser;
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125 | pGVM->iomr0.s.paMmioRegs[hRegion].pDevIns = pDevIns;
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126 | pGVM->iomr0.s.paMmioRegs[hRegion].pfnWriteCallback = pfnWrite;
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127 | pGVM->iomr0.s.paMmioRegs[hRegion].pfnReadCallback = pfnRead;
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128 | pGVM->iomr0.s.paMmioRegs[hRegion].pfnFillCallback = pfnFill;
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129 | pGVM->iomr0.s.paMmioRegs[hRegion].fFlags = fFlags;
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130 | #ifdef VBOX_WITH_STATISTICS
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131 | uint16_t const idxStats = pGVM->iomr0.s.paMmioRing3Regs[hRegion].idxStats;
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132 | pGVM->iomr0.s.paMmioRegs[hRegion].idxStats = (uint32_t)idxStats < pGVM->iomr0.s.cMmioStatsAllocation
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133 | ? idxStats : UINT16_MAX;
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134 | #else
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135 | pGVM->iomr0.s.paMmioRegs[hRegion].idxStats = UINT16_MAX;
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136 | #endif
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137 |
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138 | pGVM->iomr0.s.paMmioRing3Regs[hRegion].fRing0 = true;
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139 |
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140 | return VINF_SUCCESS;
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141 | }
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142 |
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143 |
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144 | /**
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145 | * Grows the MMIO registration (all contexts) and lookup tables.
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146 | *
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147 | * @returns VBox status code.
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148 | * @param pGVM The global (ring-0) VM structure.
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149 | * @param cReqMinEntries The minimum growth (absolute).
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150 | * @thread EMT(0)
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151 | * @note Only callable at VM creation time.
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152 | */
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153 | VMMR0_INT_DECL(int) IOMR0MmioGrowRegistrationTables(PGVM pGVM, uint64_t cReqMinEntries)
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154 | {
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155 | /*
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156 | * Validate input and state.
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157 | */
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158 | VM_ASSERT_EMT0_RETURN(pGVM, VERR_VM_THREAD_NOT_EMT);
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159 | VM_ASSERT_STATE_RETURN(pGVM, VMSTATE_CREATING, VERR_VM_INVALID_VM_STATE);
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160 | AssertReturn(cReqMinEntries <= _4K, VERR_IOM_TOO_MANY_MMIO_REGISTRATIONS);
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161 | uint32_t cNewEntries = (uint32_t)cReqMinEntries;
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162 | AssertReturn(cNewEntries >= pGVM->iom.s.cMmioAlloc, VERR_IOM_MMIO_IPE_1);
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163 | uint32_t const cOldEntries = pGVM->iomr0.s.cMmioAlloc;
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164 | ASMCompilerBarrier();
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165 | AssertReturn(cNewEntries >= cOldEntries, VERR_IOM_MMIO_IPE_2);
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166 | AssertReturn(pGVM->iom.s.cMmioRegs >= pGVM->iomr0.s.cMmioMax, VERR_IOM_MMIO_IPE_3);
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167 |
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168 | /*
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169 | * Allocate the new tables. We use a single allocation for the three tables (ring-0,
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170 | * ring-3, lookup) and does a partial mapping of the result to ring-3.
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171 | */
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172 | uint32_t const cbRing0 = RT_ALIGN_32(cNewEntries * sizeof(IOMMMIOENTRYR0), HOST_PAGE_SIZE);
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173 | uint32_t const cbRing3 = RT_ALIGN_32(cNewEntries * sizeof(IOMMMIOENTRYR3), HOST_PAGE_SIZE);
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174 | uint32_t const cbShared = RT_ALIGN_32(cNewEntries * sizeof(IOMMMIOLOOKUPENTRY), HOST_PAGE_SIZE);
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175 | uint32_t const cbNew = cbRing0 + cbRing3 + cbShared;
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176 |
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177 | /* Use the rounded up space as best we can. */
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178 | cNewEntries = RT_MIN(RT_MIN(cbRing0 / sizeof(IOMMMIOENTRYR0), cbRing3 / sizeof(IOMMMIOENTRYR3)),
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179 | cbShared / sizeof(IOMMMIOLOOKUPENTRY));
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180 |
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181 | RTR0MEMOBJ hMemObj;
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182 | int rc = RTR0MemObjAllocPage(&hMemObj, cbNew, false /*fExecutable*/);
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183 | if (RT_SUCCESS(rc))
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184 | {
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185 | /*
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186 | * Zero and map it.
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187 | */
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188 | RT_BZERO(RTR0MemObjAddress(hMemObj), cbNew);
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189 |
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190 | RTR0MEMOBJ hMapObj;
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191 | rc = RTR0MemObjMapUserEx(&hMapObj, hMemObj, (RTR3PTR)-1, HOST_PAGE_SIZE, RTMEM_PROT_READ | RTMEM_PROT_WRITE,
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192 | RTR0ProcHandleSelf(), cbRing0, cbNew - cbRing0);
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193 | if (RT_SUCCESS(rc))
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194 | {
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195 | PIOMMMIOENTRYR0 const paRing0 = (PIOMMMIOENTRYR0)RTR0MemObjAddress(hMemObj);
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196 | PIOMMMIOENTRYR3 const paRing3 = (PIOMMMIOENTRYR3)((uintptr_t)paRing0 + cbRing0);
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197 | PIOMMMIOLOOKUPENTRY const paLookup = (PIOMMMIOLOOKUPENTRY)((uintptr_t)paRing3 + cbRing3);
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198 | RTR3UINTPTR const uAddrRing3 = RTR0MemObjAddressR3(hMapObj);
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199 |
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200 | /*
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201 | * Copy over the old info and initialize the idxSelf and idxStats members.
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202 | */
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203 | if (pGVM->iomr0.s.paMmioRegs != NULL)
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204 | {
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205 | memcpy(paRing0, pGVM->iomr0.s.paMmioRegs, sizeof(paRing0[0]) * cOldEntries);
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206 | memcpy(paRing3, pGVM->iomr0.s.paMmioRing3Regs, sizeof(paRing3[0]) * cOldEntries);
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207 | memcpy(paLookup, pGVM->iomr0.s.paMmioLookup, sizeof(paLookup[0]) * cOldEntries);
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208 | }
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209 |
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210 | size_t i = cbRing0 / sizeof(*paRing0);
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211 | while (i-- > cOldEntries)
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212 | {
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213 | paRing0[i].idxSelf = (uint16_t)i;
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214 | paRing0[i].idxStats = UINT16_MAX;
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215 | }
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216 | i = cbRing3 / sizeof(*paRing3);
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217 | while (i-- > cOldEntries)
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218 | {
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219 | paRing3[i].idxSelf = (uint16_t)i;
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220 | paRing3[i].idxStats = UINT16_MAX;
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221 | }
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222 |
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223 | /*
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224 | * Switch the memory handles.
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225 | */
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226 | RTR0MEMOBJ hTmp = pGVM->iomr0.s.hMmioMapObj;
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227 | pGVM->iomr0.s.hMmioMapObj = hMapObj;
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228 | hMapObj = hTmp;
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229 |
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230 | hTmp = pGVM->iomr0.s.hMmioMemObj;
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231 | pGVM->iomr0.s.hMmioMemObj = hMemObj;
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232 | hMemObj = hTmp;
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233 |
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234 | /*
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235 | * Update the variables.
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236 | */
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237 | pGVM->iomr0.s.paMmioRegs = paRing0;
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238 | pGVM->iomr0.s.paMmioRing3Regs = paRing3;
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239 | pGVM->iomr0.s.paMmioLookup = paLookup;
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240 | pGVM->iom.s.paMmioRegs = uAddrRing3;
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241 | pGVM->iom.s.paMmioLookup = uAddrRing3 + cbRing3;
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242 | pGVM->iom.s.cMmioAlloc = cNewEntries;
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243 | pGVM->iomr0.s.cMmioAlloc = cNewEntries;
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244 |
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245 | /*
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246 | * Free the old allocation.
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247 | */
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248 | RTR0MemObjFree(hMapObj, true /*fFreeMappings*/);
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249 | }
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250 | RTR0MemObjFree(hMemObj, true /*fFreeMappings*/);
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251 | }
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252 |
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253 | return rc;
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254 | }
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255 |
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256 |
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257 | /**
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258 | * Grows the MMIO statistics table.
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259 | *
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260 | * @returns VBox status code.
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261 | * @param pGVM The global (ring-0) VM structure.
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262 | * @param cReqMinEntries The minimum growth (absolute).
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263 | * @thread EMT(0)
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264 | * @note Only callable at VM creation time.
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265 | */
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266 | VMMR0_INT_DECL(int) IOMR0MmioGrowStatisticsTable(PGVM pGVM, uint64_t cReqMinEntries)
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267 | {
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268 | /*
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269 | * Validate input and state.
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270 | */
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271 | VM_ASSERT_EMT0_RETURN(pGVM, VERR_VM_THREAD_NOT_EMT);
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272 | VM_ASSERT_STATE_RETURN(pGVM, VMSTATE_CREATING, VERR_VM_INVALID_VM_STATE);
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273 | AssertReturn(cReqMinEntries <= _64K, VERR_IOM_TOO_MANY_MMIO_REGISTRATIONS);
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274 | uint32_t cNewEntries = (uint32_t)cReqMinEntries;
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275 | #ifdef VBOX_WITH_STATISTICS
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276 | uint32_t const cOldEntries = pGVM->iomr0.s.cMmioStatsAllocation;
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277 | ASMCompilerBarrier();
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278 | #else
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279 | uint32_t const cOldEntries = 0;
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280 | #endif
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281 | AssertReturn(cNewEntries > cOldEntries, VERR_IOM_MMIO_IPE_1);
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282 | AssertReturn(pGVM->iom.s.cMmioStatsAllocation == cOldEntries, VERR_IOM_MMIO_IPE_1);
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283 | AssertReturn(pGVM->iom.s.cMmioStats <= cOldEntries, VERR_IOM_MMIO_IPE_2);
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284 | #ifdef VBOX_WITH_STATISTICS
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285 | AssertReturn(!pGVM->iomr0.s.fMmioStatsFrozen, VERR_WRONG_ORDER);
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286 | #endif
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287 |
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288 | /*
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289 | * Allocate a new table, zero it and map it.
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290 | */
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291 | #ifndef VBOX_WITH_STATISTICS
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292 | AssertFailedReturn(VERR_NOT_SUPPORTED);
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293 | #else
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294 | uint32_t const cbNew = RT_ALIGN_32(cNewEntries * sizeof(IOMMMIOSTATSENTRY), HOST_PAGE_SIZE);
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295 | cNewEntries = cbNew / sizeof(IOMMMIOSTATSENTRY);
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296 |
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297 | RTR0MEMOBJ hMemObj;
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298 | int rc = RTR0MemObjAllocPage(&hMemObj, cbNew, false /*fExecutable*/);
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299 | if (RT_SUCCESS(rc))
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300 | {
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301 | RT_BZERO(RTR0MemObjAddress(hMemObj), cbNew);
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302 |
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303 | RTR0MEMOBJ hMapObj;
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304 | rc = RTR0MemObjMapUser(&hMapObj, hMemObj, (RTR3PTR)-1, HOST_PAGE_SIZE,
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305 | RTMEM_PROT_READ | RTMEM_PROT_WRITE, RTR0ProcHandleSelf());
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306 | if (RT_SUCCESS(rc))
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307 | {
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308 | PIOMMMIOSTATSENTRY pMmioStats = (PIOMMMIOSTATSENTRY)RTR0MemObjAddress(hMemObj);
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309 |
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310 | /*
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311 | * Anything to copy over and free up?
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312 | */
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313 | if (pGVM->iomr0.s.paMmioStats)
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314 | memcpy(pMmioStats, pGVM->iomr0.s.paMmioStats, cOldEntries * sizeof(IOMMMIOSTATSENTRY));
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315 |
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316 | /*
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317 | * Switch the memory handles.
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318 | */
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319 | RTR0MEMOBJ hTmp = pGVM->iomr0.s.hMmioStatsMapObj;
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320 | pGVM->iomr0.s.hMmioStatsMapObj = hMapObj;
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321 | hMapObj = hTmp;
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322 |
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323 | hTmp = pGVM->iomr0.s.hMmioStatsMemObj;
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324 | pGVM->iomr0.s.hMmioStatsMemObj = hMemObj;
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325 | hMemObj = hTmp;
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326 |
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327 | /*
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328 | * Update the variables.
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329 | */
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330 | pGVM->iomr0.s.paMmioStats = pMmioStats;
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331 | pGVM->iom.s.paMmioStats = RTR0MemObjAddressR3(pGVM->iomr0.s.hMmioStatsMapObj);
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332 | pGVM->iom.s.cMmioStatsAllocation = cNewEntries;
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333 | pGVM->iomr0.s.cMmioStatsAllocation = cNewEntries;
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334 |
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335 | /*
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336 | * Free the old allocation.
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337 | */
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338 | RTR0MemObjFree(hMapObj, true /*fFreeMappings*/);
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339 | }
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340 | RTR0MemObjFree(hMemObj, true /*fFreeMappings*/);
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341 | }
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342 | return rc;
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343 | #endif /* VBOX_WITH_STATISTICS */
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344 | }
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345 |
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346 |
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347 | /**
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348 | * Called after all devices has been instantiated to copy over the statistics
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349 | * indices to the ring-0 MMIO registration table.
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350 | *
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351 | * This simplifies keeping statistics for MMIO ranges that are ring-3 only.
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352 | *
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353 | * @returns VBox status code.
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354 | * @param pGVM The global (ring-0) VM structure.
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355 | * @thread EMT(0)
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356 | * @note Only callable at VM creation time.
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357 | */
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358 | VMMR0_INT_DECL(int) IOMR0MmioSyncStatisticsIndices(PGVM pGVM)
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359 | {
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360 | VM_ASSERT_EMT0_RETURN(pGVM, VERR_VM_THREAD_NOT_EMT);
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361 | VM_ASSERT_STATE_RETURN(pGVM, VMSTATE_CREATING, VERR_VM_INVALID_VM_STATE);
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362 |
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363 | #ifdef VBOX_WITH_STATISTICS
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364 | /*
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365 | * First, freeze the statistics array:
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366 | */
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367 | pGVM->iomr0.s.fMmioStatsFrozen = true;
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368 |
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369 | /*
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370 | * Second, synchronize the indices:
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371 | */
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372 | uint32_t const cRegs = RT_MIN(pGVM->iom.s.cMmioRegs, pGVM->iomr0.s.cMmioAlloc);
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373 | uint32_t const cStatsAlloc = pGVM->iomr0.s.cMmioStatsAllocation;
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374 | PIOMMMIOENTRYR0 paMmioRegs = pGVM->iomr0.s.paMmioRegs;
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375 | IOMMMIOENTRYR3 const *paMmioRegsR3 = pGVM->iomr0.s.paMmioRing3Regs;
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376 | AssertReturn((paMmioRegs && paMmioRegsR3) || cRegs == 0, VERR_IOM_MMIO_IPE_3);
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377 |
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378 | for (uint32_t i = 0 ; i < cRegs; i++)
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379 | {
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380 | uint16_t idxStats = paMmioRegsR3[i].idxStats;
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381 | paMmioRegs[i].idxStats = idxStats < cStatsAlloc ? idxStats : UINT16_MAX;
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382 | }
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383 |
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384 | #else
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385 | RT_NOREF(pGVM);
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386 | #endif
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387 | return VINF_SUCCESS;
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388 | }
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389 |
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