| 1 | /* $Id: MMRamRC.cpp 76553 2019-01-01 01:45:53Z 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) 2006-2019 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_MM
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| 23 | #include <VBox/vmm/mm.h>
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| 24 | #include <VBox/vmm/cpum.h>
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| 25 | #include <VBox/vmm/trpm.h>
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| 26 | #include <VBox/vmm/em.h>
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| 27 | #include "MMInternal.h"
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| 28 | #include <VBox/vmm/vm.h>
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| 29 | #include <VBox/vmm/vmm.h>
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| 30 | #include <VBox/vmm/pgm.h>
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| 31 |
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| 32 | #include <iprt/assert.h>
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| 33 | #include <VBox/param.h>
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| 34 | #include <VBox/err.h>
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| 35 |
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| 36 |
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| 37 | /*********************************************************************************************************************************
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| 38 | * Internal Functions *
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| 39 | *********************************************************************************************************************************/
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| 40 | static DECLCALLBACK(int) mmGCRamTrap0eHandler(PVM pVM, PCPUMCTXCORE pRegFrame);
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| 41 |
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| 42 | DECLASM(void) MMGCRamReadNoTrapHandler_EndProc(void);
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| 43 | DECLASM(void) MMGCRamWriteNoTrapHandler_EndProc(void);
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| 44 | DECLASM(void) MMGCRamRead_Error(void);
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| 45 | DECLASM(void) MMGCRamWrite_Error(void);
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| 46 |
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| 47 |
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| 48 | /**
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| 49 | * Install MMGCRam Hypervisor page fault handler for normal working
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| 50 | * of MMGCRamRead and MMGCRamWrite calls.
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| 51 | * This handler will be automatically removed at page fault.
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| 52 | * In other case it must be removed by MMGCRamDeregisterTrapHandler call.
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| 53 | *
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| 54 | * @param pVM The cross context VM structure.
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| 55 | */
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| 56 | VMMRCDECL(void) MMGCRamRegisterTrapHandler(PVM pVM)
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| 57 | {
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| 58 | TRPMGCSetTempHandler(pVM, 0xe, mmGCRamTrap0eHandler);
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| 59 | }
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| 60 |
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| 61 |
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| 62 | /**
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| 63 | * Remove MMGCRam Hypervisor page fault handler.
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| 64 | * See description of MMGCRamRegisterTrapHandler call.
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| 65 | *
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| 66 | * @param pVM The cross context VM structure.
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| 67 | */
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| 68 | VMMRCDECL(void) MMGCRamDeregisterTrapHandler(PVM pVM)
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| 69 | {
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| 70 | TRPMGCSetTempHandler(pVM, 0xe, NULL);
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| 71 | }
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| 72 |
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| 73 |
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| 74 | /**
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| 75 | * Read data in guest context with \#PF control.
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| 76 | *
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| 77 | * @returns VBox status code.
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| 78 | * @param pVM The cross context VM structure.
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| 79 | * @param pDst Where to store the read data.
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| 80 | * @param pSrc Pointer to the data to read.
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| 81 | * @param cb Size of data to read.
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| 82 | */
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| 83 | VMMRCDECL(int) MMGCRamRead(PVM pVM, void *pDst, void *pSrc, size_t cb)
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| 84 | {
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| 85 | int rc;
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| 86 | PVMCPU pVCpu = VMMGetCpu0(pVM);
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| 87 |
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| 88 | /*
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| 89 | * Save the current trap info, because it will get trashed if our access failed.
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| 90 | */
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| 91 | TRPMSaveTrap(pVCpu);
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| 92 |
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| 93 | /*
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| 94 | * Need to serve the request in a silly loop because the assembly code wasn't
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| 95 | * written for abrbitrary sizes, only 1/2/4/8.
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| 96 | */
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| 97 | MMGCRamRegisterTrapHandler(pVM);
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| 98 | for (;;)
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| 99 | {
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| 100 | size_t cbThisRead;
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| 101 | switch (cb)
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| 102 | {
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| 103 | case 1: cbThisRead = 1; break;
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| 104 | case 2: cbThisRead = 2; break;
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| 105 | case 3: cbThisRead = 2; break;
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| 106 | case 4: cbThisRead = 4; break;
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| 107 | case 5: cbThisRead = 4; break;
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| 108 | case 6: cbThisRead = 4; break;
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| 109 | case 7: cbThisRead = 4; break;
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| 110 | default:
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| 111 | case 8: cbThisRead = 8; break;
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| 112 | }
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| 113 | rc = MMGCRamReadNoTrapHandler(pDst, pSrc, cbThisRead);
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| 114 | if (RT_FAILURE(rc) || cbThisRead == cb)
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| 115 | break;
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| 116 |
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| 117 | /* advance */
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| 118 | cb -= cbThisRead;
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| 119 | pDst = (uint8_t *)pDst + cbThisRead;
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| 120 | pSrc = (uint8_t *)pSrc + cbThisRead;
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| 121 | }
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| 122 | MMGCRamDeregisterTrapHandler(pVM);
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| 123 |
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| 124 | if (RT_FAILURE(rc))
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| 125 | TRPMRestoreTrap(pVCpu);
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| 126 |
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| 127 | return rc;
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| 128 | }
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| 129 |
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| 130 |
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| 131 | /**
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| 132 | * Write data in guest context with \#PF control.
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| 133 | *
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| 134 | * @returns VBox status code.
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| 135 | * @param pVM The cross context VM structure.
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| 136 | * @param pDst Where to write the data.
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| 137 | * @param pSrc Pointer to the data to write.
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| 138 | * @param cb Size of data to write, only 1/2/4 is valid.
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| 139 | *
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| 140 | * @deprecated Don't use this as it doesn't check the page state.
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| 141 | */
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| 142 | VMMRCDECL(int) MMGCRamWrite(PVM pVM, void *pDst, void *pSrc, size_t cb)
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| 143 | {
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| 144 | PVMCPU pVCpu = VMMGetCpu0(pVM);
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| 145 | TRPMSaveTrap(pVCpu); /* save the current trap info, because it will get trashed if our access failed. */
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| 146 |
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| 147 | MMGCRamRegisterTrapHandler(pVM);
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| 148 | int rc = MMGCRamWriteNoTrapHandler(pDst, pSrc, cb);
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| 149 | MMGCRamDeregisterTrapHandler(pVM);
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| 150 | if (RT_FAILURE(rc))
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| 151 | TRPMRestoreTrap(pVCpu);
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| 152 |
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| 153 | /*
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| 154 | * And mark the relevant guest page as accessed and dirty.
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| 155 | */
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| 156 | PGMGstModifyPage(VMMGetCpu0(pVM), (RTGCPTR)(RTRCUINTPTR)pDst, cb, X86_PTE_A | X86_PTE_D, ~(uint64_t)(X86_PTE_A | X86_PTE_D));
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| 157 |
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| 158 | return rc;
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| 159 | }
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| 160 |
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| 161 |
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| 162 | /**
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| 163 | * \#PF Handler for servicing traps inside MMGCRamReadNoTrapHandler and MMGCRamWriteNoTrapHandler functions.
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| 164 | *
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| 165 | * @internal
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| 166 | */
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| 167 | DECLCALLBACK(int) mmGCRamTrap0eHandler(PVM pVM, PCPUMCTXCORE pRegFrame)
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| 168 | {
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| 169 | /*
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| 170 | * Page fault inside MMGCRamRead()? Resume at *_Error.
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| 171 | */
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| 172 | if ( (uintptr_t)&MMGCRamReadNoTrapHandler < (uintptr_t)pRegFrame->eip
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| 173 | && (uintptr_t)pRegFrame->eip < (uintptr_t)&MMGCRamReadNoTrapHandler_EndProc)
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| 174 | {
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| 175 | /* Must be a read violation. */
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| 176 | AssertReturn(!(TRPMGetErrorCode(VMMGetCpu0(pVM)) & X86_TRAP_PF_RW), VERR_MM_BAD_TRAP_TYPE_IPE);
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| 177 | pRegFrame->eip = (uintptr_t)&MMGCRamRead_Error;
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| 178 | return VINF_SUCCESS;
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| 179 | }
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| 180 |
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| 181 | /*
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| 182 | * Page fault inside MMGCRamWrite()? Resume at _Error.
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| 183 | */
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| 184 | if ( (uintptr_t)&MMGCRamWriteNoTrapHandler < (uintptr_t)pRegFrame->eip
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| 185 | && (uintptr_t)pRegFrame->eip < (uintptr_t)&MMGCRamWriteNoTrapHandler_EndProc)
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| 186 | {
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| 187 | /* Must be a write violation. */
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| 188 | AssertReturn(TRPMGetErrorCode(VMMGetCpu0(pVM)) & X86_TRAP_PF_RW, VERR_MM_BAD_TRAP_TYPE_IPE);
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| 189 | pRegFrame->eip = (uintptr_t)&MMGCRamWrite_Error;
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| 190 | return VINF_SUCCESS;
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| 191 | }
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| 192 |
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| 193 | /*
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| 194 | * #PF is not handled - cause guru meditation.
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| 195 | */
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| 196 | return VERR_INTERNAL_ERROR;
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| 197 | }
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| 198 |
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