| 1 | /* $Id: MMRamGC.cpp 23 2007-01-15 14:08:28Z vboxsync $ */
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| 2 | /** @file
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| 3 | * MMRamGC - Guest Context Ram access Routines, pair for MMRamGCA.asm.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006 InnoTek Systemberatung GmbH
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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 as published by the Free Software Foundation,
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| 13 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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| 14 | * distribution. VirtualBox OSE is distributed in the hope that it will
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| 15 | * be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * If you received this file as part of a commercial VirtualBox
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| 18 | * distribution, then only the terms of your commercial VirtualBox
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| 19 | * license agreement apply instead of the previous paragraph.
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| 20 | */
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| 21 |
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| 22 |
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| 23 | /*******************************************************************************
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| 24 | * Header Files *
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| 25 | *******************************************************************************/
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| 26 | #define LOG_GROUP LOG_GROUP_MM
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| 27 | #include <VBox/mm.h>
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| 28 | #include <VBox/cpum.h>
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| 29 | #include <VBox/trpm.h>
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| 30 | #include "MMInternal.h"
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| 31 | #include <VBox/vm.h>
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| 32 | #include <VBox/pgm.h>
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| 33 |
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| 34 | #include <iprt/assert.h>
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| 35 | #include <VBox/param.h>
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| 36 | #include <VBox/err.h>
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| 37 |
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| 38 |
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| 39 | /*******************************************************************************
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| 40 | * Internal Functions *
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| 41 | *******************************************************************************/
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| 42 | static DECLCALLBACK(int) mmgcramTrap0eHandler(PVM pVM, PCPUMCTXCORE pRegFrame);
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| 43 |
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| 44 | DECLASM(void) MMGCRamReadNoTrapHandler_EndProc(void);
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| 45 | DECLASM(void) MMGCRamWriteNoTrapHandler_EndProc(void);
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| 46 |
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| 47 | DECLASM(void) MMGCRamRead_Error(void);
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| 48 | DECLASM(void) MMGCRamWrite_Error(void);
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| 49 |
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| 50 |
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| 51 | /**
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| 52 | * Install MMGCRam Hypervisor page fault handler for normal working
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| 53 | * of MMGCRamRead and MMGCRamWrite calls.
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| 54 | * This handler will be authomatically removed at page fault.
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| 55 | * In other case it must be removed by MMGCRamDeregisterTrapHandler call.
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| 56 | *
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| 57 | * @param pVM VM handle.
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| 58 | */
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| 59 | MMGCDECL(void) MMGCRamRegisterTrapHandler(PVM pVM)
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| 60 | {
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| 61 | TRPMGCSetTempHandler(pVM, 0xe, mmgcramTrap0eHandler);
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| 62 | }
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| 63 |
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| 64 | /**
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| 65 | * Remove MMGCRam Hypervisor page fault handler.
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| 66 | * See description of MMGCRamRegisterTrapHandler call.
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| 67 | *
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| 68 | * @param pVM VM handle.
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| 69 | */
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| 70 | MMGCDECL(void) MMGCRamDeregisterTrapHandler(PVM pVM)
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| 71 | {
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| 72 | TRPMGCSetTempHandler(pVM, 0xe, NULL);
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| 73 | }
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| 74 |
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| 75 |
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| 76 | /**
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| 77 | * Read data in guest context with #PF control.
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| 78 | *
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| 79 | * @returns VBox status.
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| 80 | * @param pVM The VM handle.
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| 81 | * @param pDst Where to store the readed data.
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| 82 | * @param pSrc Pointer to the data to read.
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| 83 | * @param cb Size of data to read, only 1/2/4/8 is valid.
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| 84 | */
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| 85 | MMGCDECL(int) MMGCRamRead(PVM pVM, void *pDst, void *pSrc, size_t cb)
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| 86 | {
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| 87 | int rc;
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| 88 |
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| 89 | TRPMSaveTrap(pVM); /* save the current trap info, because it will get trashed if our access failed. */
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| 90 |
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| 91 | MMGCRamRegisterTrapHandler(pVM);
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| 92 | rc = MMGCRamReadNoTrapHandler(pDst, pSrc, cb);
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| 93 | MMGCRamDeregisterTrapHandler(pVM);
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| 94 | if (VBOX_FAILURE(rc))
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| 95 | TRPMRestoreTrap(pVM);
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| 96 |
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| 97 | return rc;
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| 98 | }
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| 99 |
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| 100 | /**
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| 101 | * Write data in guest context with #PF control.
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| 102 | *
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| 103 | * @returns VBox status.
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| 104 | * @param pVM The VM handle.
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| 105 | * @param pDst Where to write the data.
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| 106 | * @param pSrc Pointer to the data to write.
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| 107 | * @param cb Size of data to write, only 1/2/4 is valid.
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| 108 | */
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| 109 | MMGCDECL(int) MMGCRamWrite(PVM pVM, void *pDst, void *pSrc, size_t cb)
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| 110 | {
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| 111 | int rc;
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| 112 |
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| 113 | TRPMSaveTrap(pVM); /* save the current trap info, because it will get trashed if our access failed. */
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| 114 |
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| 115 | MMGCRamRegisterTrapHandler(pVM);
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| 116 | rc = MMGCRamWriteNoTrapHandler(pDst, pSrc, cb);
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| 117 | MMGCRamDeregisterTrapHandler(pVM);
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| 118 | if (VBOX_FAILURE(rc))
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| 119 | TRPMRestoreTrap(pVM);
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| 120 |
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| 121 | /*
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| 122 | * And mark the relevant guest page as accessed and dirty.
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| 123 | */
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| 124 | PGMGstModifyPage(pVM, pDst, cb, X86_PTE_A | X86_PTE_D, ~(uint64_t)(X86_PTE_A | X86_PTE_D));
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| 125 |
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| 126 | return rc;
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| 127 | }
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| 128 |
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| 129 |
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| 130 | /**
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| 131 | * \#PF Handler for servicing traps inside MMGCRamReadNoTrapHandler and MMGCRamWriteNoTrapHandler functions.
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| 132 | *
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| 133 | * @internal
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| 134 | */
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| 135 | DECLCALLBACK(int) mmgcramTrap0eHandler(PVM pVM, PCPUMCTXCORE pRegFrame)
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| 136 | {
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| 137 | /*
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| 138 | * Check where the trap was occurred.
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| 139 | */
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| 140 | if ( (uintptr_t)&MMGCRamReadNoTrapHandler < (uintptr_t)pRegFrame->eip
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| 141 | && (uintptr_t)pRegFrame->eip < (uintptr_t)&MMGCRamReadNoTrapHandler_EndProc)
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| 142 | {
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| 143 | /*
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| 144 | * Page fault inside MMGCRamRead() func.
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| 145 | */
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| 146 | RTGCUINT uErrorCode = TRPMGetErrorCode(pVM);
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| 147 |
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| 148 | /* Must be read violation. */
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| 149 | if (uErrorCode & X86_TRAP_PF_RW)
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| 150 | return VERR_INTERNAL_ERROR;
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| 151 |
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| 152 | /* Return execution to func at error label. */
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| 153 | pRegFrame->eip = (uintptr_t)&MMGCRamRead_Error;
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| 154 | return VINF_SUCCESS;
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| 155 | }
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| 156 | else if ( (uintptr_t)&MMGCRamWriteNoTrapHandler < (uintptr_t)pRegFrame->eip
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| 157 | && (uintptr_t)pRegFrame->eip < (uintptr_t)&MMGCRamWriteNoTrapHandler_EndProc)
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| 158 | {
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| 159 | /*
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| 160 | * Page fault inside MMGCRamWrite() func.
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| 161 | */
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| 162 | RTGCUINT uErrorCode = TRPMGetErrorCode(pVM);
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| 163 |
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| 164 | /* Must be write violation. */
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| 165 | if (!(uErrorCode & X86_TRAP_PF_RW))
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| 166 | return VERR_INTERNAL_ERROR;
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| 167 |
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| 168 | /* Return execution to func at error label. */
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| 169 | pRegFrame->eip = (uintptr_t)&MMGCRamWrite_Error;
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| 170 | return VINF_SUCCESS;
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| 171 | }
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| 172 |
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| 173 | /* #PF is not handled - kill the Hypervisor. */
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| 174 | return VERR_INTERNAL_ERROR;
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| 175 | }
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| 176 |
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| 177 |
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