| 1 | /** @file
|
|---|
| 2 | *
|
|---|
| 3 | * VBox host drivers - Ring-0 support drivers - Linux host:
|
|---|
| 4 | * Linux implementations for driver support library
|
|---|
| 5 | */
|
|---|
| 6 |
|
|---|
| 7 | /*
|
|---|
| 8 | * Copyright (C) 2006-2007 innotek GmbH
|
|---|
| 9 | *
|
|---|
| 10 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 11 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 12 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 13 | * General Public License as published by the Free Software Foundation,
|
|---|
| 14 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
|
|---|
| 15 | * distribution. VirtualBox OSE is distributed in the hope that it will
|
|---|
| 16 | * be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 17 | *
|
|---|
| 18 | * If you received this file as part of a commercial VirtualBox
|
|---|
| 19 | * distribution, then only the terms of your commercial VirtualBox
|
|---|
| 20 | * license agreement apply instead of the previous paragraph.
|
|---|
| 21 | */
|
|---|
| 22 |
|
|---|
| 23 |
|
|---|
| 24 | /*******************************************************************************
|
|---|
| 25 | * Header Files *
|
|---|
| 26 | *******************************************************************************/
|
|---|
| 27 | #include <sys/fcntl.h>
|
|---|
| 28 | #include <sys/ioctl.h>
|
|---|
| 29 | #include <sys/mman.h>
|
|---|
| 30 | #include <errno.h>
|
|---|
| 31 | #include <unistd.h>
|
|---|
| 32 | #include <stdlib.h>
|
|---|
| 33 | #include <malloc.h>
|
|---|
| 34 | #include <string.h>
|
|---|
| 35 |
|
|---|
| 36 | #include <VBox/sup.h>
|
|---|
| 37 | #include <VBox/types.h>
|
|---|
| 38 | #include <VBox/log.h>
|
|---|
| 39 | #include <iprt/path.h>
|
|---|
| 40 | #include <iprt/assert.h>
|
|---|
| 41 | #include <VBox/err.h>
|
|---|
| 42 | #include <VBox/param.h>
|
|---|
| 43 | #include "SUPLibInternal.h"
|
|---|
| 44 | #include "SUPDRVIOC.h"
|
|---|
| 45 |
|
|---|
| 46 |
|
|---|
| 47 | /*******************************************************************************
|
|---|
| 48 | * Defined Constants And Macros *
|
|---|
| 49 | *******************************************************************************/
|
|---|
| 50 | /** Unix Device name. */
|
|---|
| 51 | #define DEVICE_NAME "/dev/vboxdrv"
|
|---|
| 52 |
|
|---|
| 53 | /* define MADV_DONTFORK if it's missing from the system headers. */
|
|---|
| 54 | #ifndef MADV_DONTFORK
|
|---|
| 55 | # define MADV_DONTFORK 10
|
|---|
| 56 | #endif
|
|---|
| 57 |
|
|---|
| 58 |
|
|---|
| 59 | /*******************************************************************************
|
|---|
| 60 | * Global Variables *
|
|---|
| 61 | *******************************************************************************/
|
|---|
| 62 | /** Handle to the open device. */
|
|---|
| 63 | static int g_hDevice = -1;
|
|---|
| 64 | /** Flags whether or not we've loaded the kernel module. */
|
|---|
| 65 | static bool g_fLoadedModule = false;
|
|---|
| 66 | /** Indicates whether madvise(,,MADV_DONTFORK) works. */
|
|---|
| 67 | static bool g_fSysMadviseWorks = false;
|
|---|
| 68 |
|
|---|
| 69 |
|
|---|
| 70 | /*******************************************************************************
|
|---|
| 71 | * Internal Functions *
|
|---|
| 72 | *******************************************************************************/
|
|---|
| 73 |
|
|---|
| 74 |
|
|---|
| 75 | /**
|
|---|
| 76 | * Initialize the OS specific part of the library.
|
|---|
| 77 | * On Linux this involves:
|
|---|
| 78 | * - loading the module.
|
|---|
| 79 | * - open driver.
|
|---|
| 80 | *
|
|---|
| 81 | * @returns 0 on success.
|
|---|
| 82 | * @returns current -1 on failure but this must be changed to proper error codes.
|
|---|
| 83 | * @param cbReserved Ignored on linux.
|
|---|
| 84 | */
|
|---|
| 85 | int suplibOsInit(size_t cbReserve)
|
|---|
| 86 | {
|
|---|
| 87 | /*
|
|---|
| 88 | * Check if already initialized.
|
|---|
| 89 | */
|
|---|
| 90 | if (g_hDevice >= 0)
|
|---|
| 91 | return 0;
|
|---|
| 92 |
|
|---|
| 93 | /*
|
|---|
| 94 | * Try open the device.
|
|---|
| 95 | */
|
|---|
| 96 | g_hDevice = open(DEVICE_NAME, O_RDWR, 0);
|
|---|
| 97 | if (g_hDevice < 0)
|
|---|
| 98 | {
|
|---|
| 99 | /*
|
|---|
| 100 | * Try load the device.
|
|---|
| 101 | */
|
|---|
| 102 | //todo suplibOsLoadKernelModule();
|
|---|
| 103 | g_hDevice = open(DEVICE_NAME, O_RDWR, 0);
|
|---|
| 104 | if (g_hDevice < 0)
|
|---|
| 105 | {
|
|---|
| 106 | switch (errno)
|
|---|
| 107 | {
|
|---|
| 108 | case ENXIO: /* see man 2 open, ENODEV is actually a kernel bug */
|
|---|
| 109 | case ENODEV: return VERR_VM_DRIVER_LOAD_ERROR;
|
|---|
| 110 | case EPERM:
|
|---|
| 111 | case EACCES: return VERR_VM_DRIVER_NOT_ACCESSIBLE;
|
|---|
| 112 | case ENOENT: return VERR_VM_DRIVER_NOT_INSTALLED;
|
|---|
| 113 | default:
|
|---|
| 114 | return VERR_VM_DRIVER_OPEN_ERROR;
|
|---|
| 115 | }
|
|---|
| 116 | }
|
|---|
| 117 | }
|
|---|
| 118 |
|
|---|
| 119 | /*
|
|---|
| 120 | * Mark the file handle close on exec.
|
|---|
| 121 | */
|
|---|
| 122 | if (fcntl(g_hDevice, F_SETFD, FD_CLOEXEC) == -1)
|
|---|
| 123 | {
|
|---|
| 124 | close(g_hDevice);
|
|---|
| 125 | g_hDevice = -1;
|
|---|
| 126 | return RTErrConvertFromErrno(errno);
|
|---|
| 127 | }
|
|---|
| 128 |
|
|---|
| 129 | /*
|
|---|
| 130 | * Check if madvise works.
|
|---|
| 131 | */
|
|---|
| 132 | void *pv = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
|---|
| 133 | if (!pv)
|
|---|
| 134 | return VERR_NO_MEMORY;
|
|---|
| 135 | g_fSysMadviseWorks = (0 == madvise(pv, PAGE_SIZE, MADV_DONTFORK));
|
|---|
| 136 | munmap(pv, PAGE_SIZE);
|
|---|
| 137 |
|
|---|
| 138 | /*
|
|---|
| 139 | * We're done.
|
|---|
| 140 | */
|
|---|
| 141 | NOREF(cbReserve);
|
|---|
| 142 | return 0;
|
|---|
| 143 | }
|
|---|
| 144 |
|
|---|
| 145 |
|
|---|
| 146 | int suplibOsTerm(void)
|
|---|
| 147 | {
|
|---|
| 148 | /*
|
|---|
| 149 | * Check if we're initited at all.
|
|---|
| 150 | */
|
|---|
| 151 | if (g_hDevice >= 0)
|
|---|
| 152 | {
|
|---|
| 153 | if (close(g_hDevice))
|
|---|
| 154 | AssertFailed();
|
|---|
| 155 | g_hDevice = -1;
|
|---|
| 156 | }
|
|---|
| 157 |
|
|---|
| 158 | /*
|
|---|
| 159 | * If we started the service we might consider stopping it too.
|
|---|
| 160 | *
|
|---|
| 161 | * Since this won't work unless the the process starting it is the
|
|---|
| 162 | * last user we might wanna skip this...
|
|---|
| 163 | */
|
|---|
| 164 | if (g_fLoadedModule)
|
|---|
| 165 | {
|
|---|
| 166 | //todo kernel module unloading.
|
|---|
| 167 | //suplibOsStopService();
|
|---|
| 168 | //g_fStartedService = false;
|
|---|
| 169 | }
|
|---|
| 170 |
|
|---|
| 171 | return 0;
|
|---|
| 172 | }
|
|---|
| 173 |
|
|---|
| 174 |
|
|---|
| 175 | /**
|
|---|
| 176 | * Installs anything required by the support library.
|
|---|
| 177 | *
|
|---|
| 178 | * @returns 0 on success.
|
|---|
| 179 | * @returns error code on failure.
|
|---|
| 180 | */
|
|---|
| 181 | int suplibOsInstall(void)
|
|---|
| 182 | {
|
|---|
| 183 | // nothing to do on Linux
|
|---|
| 184 | return VERR_NOT_IMPLEMENTED;
|
|---|
| 185 | }
|
|---|
| 186 |
|
|---|
| 187 |
|
|---|
| 188 | /**
|
|---|
| 189 | * Installs anything required by the support library.
|
|---|
| 190 | *
|
|---|
| 191 | * @returns 0 on success.
|
|---|
| 192 | * @returns error code on failure.
|
|---|
| 193 | */
|
|---|
| 194 | int suplibOsUninstall(void)
|
|---|
| 195 | {
|
|---|
| 196 | // nothing to do on Linux
|
|---|
| 197 | return VERR_NOT_IMPLEMENTED;
|
|---|
| 198 | }
|
|---|
| 199 |
|
|---|
| 200 |
|
|---|
| 201 | /**
|
|---|
| 202 | * Send a I/O Control request to the device.
|
|---|
| 203 | *
|
|---|
| 204 | * @returns 0 on success.
|
|---|
| 205 | * @returns VBOX error code on failure.
|
|---|
| 206 | * @param uFunction IO Control function.
|
|---|
| 207 | * @param pvIn Input data buffer.
|
|---|
| 208 | * @param cbIn Size of input data.
|
|---|
| 209 | * @param pvOut Output data buffer.
|
|---|
| 210 | * @param cbOut Size of output data.
|
|---|
| 211 | */
|
|---|
| 212 | int suplibOsIOCtl(unsigned uFunction, void *pvIn, size_t cbIn, void *pvOut, size_t cbOut)
|
|---|
| 213 | {
|
|---|
| 214 | AssertMsg(g_hDevice != -1, ("SUPLIB not initiated successfully!\n"));
|
|---|
| 215 | /*
|
|---|
| 216 | * Issue device iocontrol.
|
|---|
| 217 | */
|
|---|
| 218 | SUPDRVIOCTLDATA Args;
|
|---|
| 219 | Args.pvIn = pvIn;
|
|---|
| 220 | Args.cbIn = cbIn;
|
|---|
| 221 | Args.pvOut = pvOut;
|
|---|
| 222 | Args.cbOut = cbOut;
|
|---|
| 223 |
|
|---|
| 224 | if (ioctl(g_hDevice, uFunction, &Args) >= 0)
|
|---|
| 225 | return VINF_SUCCESS;
|
|---|
| 226 |
|
|---|
| 227 | /* This is the reverse operation of the one found in SUPDrv-linux.c */
|
|---|
| 228 | switch (errno)
|
|---|
| 229 | {
|
|---|
| 230 | case EACCES: return VERR_GENERAL_FAILURE;
|
|---|
| 231 | case EINVAL: return VERR_INVALID_PARAMETER;
|
|---|
| 232 | case EILSEQ: return VERR_INVALID_MAGIC;
|
|---|
| 233 | case ENXIO: return VERR_INVALID_HANDLE;
|
|---|
| 234 | case EFAULT: return VERR_INVALID_POINTER;
|
|---|
| 235 | case ENOLCK: return VERR_LOCK_FAILED;
|
|---|
| 236 | case EEXIST: return VERR_ALREADY_LOADED;
|
|---|
| 237 | case EPERM: return VERR_PERMISSION_DENIED;
|
|---|
| 238 | case ENOSYS: return VERR_VERSION_MISMATCH;
|
|---|
| 239 | case 1000: return VERR_IDT_FAILED;
|
|---|
| 240 | }
|
|---|
| 241 |
|
|---|
| 242 | return RTErrConvertFromErrno(errno);
|
|---|
| 243 | }
|
|---|
| 244 |
|
|---|
| 245 |
|
|---|
| 246 | /**
|
|---|
| 247 | * Allocate a number of zero-filled pages in user space.
|
|---|
| 248 | *
|
|---|
| 249 | * @returns VBox status code.
|
|---|
| 250 | * @param cPages Number of pages to allocate.
|
|---|
| 251 | * @param ppvPages Where to return the base pointer.
|
|---|
| 252 | */
|
|---|
| 253 | int suplibOsPageAlloc(size_t cPages, void **ppvPages)
|
|---|
| 254 | {
|
|---|
| 255 | #if 0
|
|---|
| 256 | int rc = posix_memalign(ppvPages, PAGE_SIZE, cPages << PAGE_SHIFT)
|
|---|
| 257 | if (!rc)
|
|---|
| 258 | {
|
|---|
| 259 | memset(*ppvPages, 0, cPages << PAGE_SHIFT);
|
|---|
| 260 | return VINF_SUCCESS;
|
|---|
| 261 | }
|
|---|
| 262 | return RTErrConvertFromErrno(rc);
|
|---|
| 263 | #else
|
|---|
| 264 | size_t cbMmap = (g_fSysMadviseWorks ? cPages : cPages + 2) << PAGE_SHIFT;
|
|---|
| 265 | char *pvPages = (char *)mmap(NULL, cbMmap, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
|---|
| 266 | if (pvPages)
|
|---|
| 267 | {
|
|---|
| 268 | if (g_fSysMadviseWorks)
|
|---|
| 269 | {
|
|---|
| 270 | /*
|
|---|
| 271 | * It is not fatal if we fail here but a forked child (e.g. the ALSA sound server)
|
|---|
| 272 | * could crash. Linux < 2.6.16 does not implement madvise(MADV_DONTFORK) but the
|
|---|
| 273 | * kernel seems to split bigger VMAs and that is all that we want -- later we set the
|
|---|
| 274 | * VM_DONTCOPY attribute in supdrvOSLockMemOne().
|
|---|
| 275 | */
|
|---|
| 276 | if (madvise (pvPages, cbMmap, MADV_DONTFORK))
|
|---|
| 277 | LogRel(("SUPLib: madvise %p-%p failed\n", pvPages, cbMmap));
|
|---|
| 278 | *ppvPages = pvPages;
|
|---|
| 279 | }
|
|---|
| 280 | else
|
|---|
| 281 | {
|
|---|
| 282 | /*
|
|---|
| 283 | * madvise(MADV_DONTFORK) is not available (most probably Linux 2.4). Enclose any
|
|---|
| 284 | * mmapped region by two unmapped pages to guarantee that there is exactly one VM
|
|---|
| 285 | * area struct of the very same size as the mmap area.
|
|---|
| 286 | */
|
|---|
| 287 | mprotect(pvPages, PAGE_SIZE, PROT_NONE);
|
|---|
| 288 | mprotect(pvPages + cbMmap - PAGE_SIZE, PAGE_SIZE, PROT_NONE);
|
|---|
| 289 | *ppvPages = pvPages + PAGE_SIZE;
|
|---|
| 290 | }
|
|---|
| 291 | memset(*ppvPages, 0, cPages << PAGE_SHIFT);
|
|---|
| 292 | return VINF_SUCCESS;
|
|---|
| 293 | }
|
|---|
| 294 | return VERR_NO_MEMORY;
|
|---|
| 295 | #endif
|
|---|
| 296 | }
|
|---|
| 297 |
|
|---|
| 298 |
|
|---|
| 299 | /**
|
|---|
| 300 | * Frees pages allocated by suplibOsPageAlloc().
|
|---|
| 301 | *
|
|---|
| 302 | * @returns VBox status code.
|
|---|
| 303 | * @param pvPages Pointer to pages.
|
|---|
| 304 | */
|
|---|
| 305 | int suplibOsPageFree(void *pvPages, size_t cPages)
|
|---|
| 306 | {
|
|---|
| 307 | munmap(pvPages, cPages << PAGE_SHIFT);
|
|---|
| 308 | return VINF_SUCCESS;
|
|---|
| 309 | }
|
|---|
