| 1 | /* $Id: VBoxCpuReportMsrLinux.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * MsrLinux - Linux-specific MSR access.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2013-2023 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 | #include "VBoxCpuReport.h"
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| 33 |
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| 34 | #include <iprt/err.h>
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| 35 | #include <iprt/file.h>
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| 36 | #include <iprt/thread.h>
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| 37 |
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| 38 | #ifndef RT_OS_WINDOWS
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| 39 | # include <unistd.h>
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| 40 | #else /* RT_OS_WINDOWS: for test compiling this file on windows */
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| 41 | # include <io.h>
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| 42 | int pread(int, void *, size_t, off_t);
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| 43 | int pwrite(int, void const *, size_t, off_t);
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| 44 | #endif
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| 45 | #include <fcntl.h>
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| 46 | #include <errno.h>
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| 47 |
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| 48 |
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| 49 | /*********************************************************************************************************************************
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| 50 | * Defined Constants And Macros *
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| 51 | *********************************************************************************************************************************/
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| 52 | #define MSR_DEV_NAME "/dev/cpu/0/msr"
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| 53 |
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| 54 |
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| 55 | /*********************************************************************************************************************************
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| 56 | * Global Variables *
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| 57 | *********************************************************************************************************************************/
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| 58 | /** The /dev/xxx/msr file descriptor. */
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| 59 | static int g_fdMsr;
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| 60 |
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| 61 |
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| 62 | /**
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| 63 | * @interface_method_impl{VBCPUREPMSRACCESSORS,pfnMsrProberRead}
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| 64 | */
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| 65 | static DECLCALLBACK(int) linuxMsrProberRead(uint32_t uMsr, RTCPUID idCpu, uint64_t *puValue, bool *pfGp)
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| 66 | {
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| 67 | int rc = VINF_SUCCESS;
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| 68 |
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| 69 | if (idCpu != NIL_RTCPUID)
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| 70 | return VERR_INVALID_PARAMETER;
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| 71 |
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| 72 | if (g_fdMsr < 0)
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| 73 | return VERR_INVALID_STATE;
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| 74 |
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| 75 | *pfGp = true;
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| 76 | if (pread(g_fdMsr, puValue, sizeof(*puValue), uMsr) != sizeof(*puValue))
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| 77 | rc = VERR_READ_ERROR;
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| 78 | else
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| 79 | *pfGp = false;
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| 80 |
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| 81 | return RT_SUCCESS(rc) && !pfGp;
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| 82 | }
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| 83 |
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| 84 |
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| 85 | /**
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| 86 | * @interface_method_impl{VBCPUREPMSRACCESSORS,pfnMsrProberWrite}
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| 87 | */
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| 88 | static DECLCALLBACK(int) linuxMsrProberWrite(uint32_t uMsr, RTCPUID idCpu, uint64_t uValue, bool *pfGp)
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| 89 | {
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| 90 | int rc = VINF_SUCCESS;
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| 91 |
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| 92 | if (idCpu != NIL_RTCPUID)
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| 93 | return VERR_INVALID_PARAMETER;
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| 94 |
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| 95 | if (g_fdMsr < 0)
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| 96 | return VERR_INVALID_STATE;
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| 97 |
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| 98 | *pfGp = true;
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| 99 | if (pwrite(g_fdMsr, &uValue, sizeof(uValue), uMsr) != sizeof(uValue))
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| 100 | rc = VERR_WRITE_ERROR;
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| 101 | else
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| 102 | *pfGp = false;
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| 103 |
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| 104 | return RT_SUCCESS(rc) && !pfGp;
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| 105 | }
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| 106 |
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| 107 | /**
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| 108 | * @interface_method_impl{VBCPUREPMSRACCESSORS,pfnMsrProberModify}
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| 109 | */
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| 110 | static DECLCALLBACK(int) linuxMsrProberModify(uint32_t uMsr, RTCPUID idCpu, uint64_t fAndMask, uint64_t fOrMask,
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| 111 | PSUPMSRPROBERMODIFYRESULT pResult)
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| 112 | {
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| 113 | int rc = VINF_SUCCESS;
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| 114 | uint64_t uBefore, uWrite, uAfter;
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| 115 | int rcBefore, rcWrite, rcAfter, rcRestore;
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| 116 |
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| 117 | if (idCpu != NIL_RTCPUID)
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| 118 | return VERR_INVALID_PARAMETER;
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| 119 |
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| 120 | if (g_fdMsr < 0)
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| 121 | return VERR_INVALID_STATE;
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| 122 |
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| 123 | #if 0
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| 124 | vbCpuRepDebug("MSR %#x\n", uMsr);
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| 125 | RTThreadSleep(10);
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| 126 | #endif
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| 127 | rcBefore = pread(g_fdMsr, &uBefore, sizeof(uBefore), uMsr);
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| 128 | uWrite = (uBefore & fAndMask) | fOrMask;
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| 129 | rcWrite = pwrite(g_fdMsr, &uWrite, sizeof(uWrite), uMsr);
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| 130 | rcAfter = pread(g_fdMsr, &uAfter, sizeof(uAfter), uMsr);
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| 131 | rcRestore = pwrite(g_fdMsr, &uBefore, sizeof(uBefore), uMsr);
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| 132 |
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| 133 | #if 0
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| 134 | vbCpuRepDebug("MSR: %#x, %#llx -> %#llx -> %#llx (%d/%d/%d/%d)\n",
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| 135 | uMsr, uBefore, uWrite, uAfter,
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| 136 | rcBefore, rcWrite != sizeof(uWrite), rcAfter, rcRestore);
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| 137 | #endif
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| 138 | pResult->uBefore = uBefore;
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| 139 | pResult->uWritten = uWrite;
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| 140 | pResult->uAfter = uAfter;
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| 141 | pResult->fBeforeGp = rcBefore != sizeof(uBefore);
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| 142 | pResult->fModifyGp = rcWrite != sizeof(uWrite);
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| 143 | pResult->fAfterGp = rcAfter != sizeof(uAfter);
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| 144 | pResult->fRestoreGp = rcRestore != sizeof(uBefore);
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| 145 |
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| 146 | return rc;
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| 147 | }
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| 148 |
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| 149 |
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| 150 | /**
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| 151 | * @interface_method_impl{VBCPUREPMSRACCESSORS,pfnTerm}
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| 152 | */
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| 153 | static DECLCALLBACK(void) linuxMsrProberTerm(void)
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| 154 | {
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| 155 | if (g_fdMsr >= 0)
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| 156 | {
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| 157 | close(g_fdMsr);
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| 158 | g_fdMsr = -1;
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| 159 | }
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| 160 | }
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| 161 |
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| 162 | int VbCpuRepMsrProberInitPlatform(PVBCPUREPMSRACCESSORS pMsrAccessors)
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| 163 | {
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| 164 | RTFILE hFile;
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| 165 | int rc = RTFileOpen(&hFile, MSR_DEV_NAME, RTFILE_O_READWRITE | RTFILE_O_DENY_NONE | RTFILE_O_OPEN);
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| 166 | if (RT_SUCCESS(rc))
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| 167 | {
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| 168 | g_fdMsr = RTFileToNative(hFile);
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| 169 | Assert(g_fdMsr != -1);
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| 170 |
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| 171 | pMsrAccessors->fAtomic = false; /* Can't modify/restore MSRs without trip to R3. */
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| 172 | pMsrAccessors->pfnMsrProberRead = linuxMsrProberRead;
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| 173 | pMsrAccessors->pfnMsrProberWrite = linuxMsrProberWrite;
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| 174 | pMsrAccessors->pfnMsrProberModify = linuxMsrProberModify;
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| 175 | pMsrAccessors->pfnTerm = linuxMsrProberTerm;
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| 176 | return VINF_SUCCESS;
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| 177 | }
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| 178 | vbCpuRepDebug("warning: Failed to open " MSR_DEV_NAME ": %Rrc\n", rc);
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| 179 | return rc;
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| 180 | }
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