Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 1 | /* |
| 2 | * os-posix-lib.c |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * Copyright (c) 2010 Red Hat, Inc. |
| 6 | * |
| 7 | * QEMU library functions on POSIX which are shared between QEMU and |
| 8 | * the QEMU tools. |
| 9 | * |
| 10 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 11 | * of this software and associated documentation files (the "Software"), to deal |
| 12 | * in the Software without restriction, including without limitation the rights |
| 13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 14 | * copies of the Software, and to permit persons to whom the Software is |
| 15 | * furnished to do so, subject to the following conditions: |
| 16 | * |
| 17 | * The above copyright notice and this permission notice shall be included in |
| 18 | * all copies or substantial portions of the Software. |
| 19 | * |
| 20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 26 | * THE SOFTWARE. |
| 27 | */ |
| 28 | |
Peter Maydell | aafd758 | 2016-01-29 17:49:55 +0000 | [diff] [blame] | 29 | #include "qemu/osdep.h" |
Stefan Hajnoczi | 13401ba | 2013-11-14 11:54:16 +0100 | [diff] [blame] | 30 | #include <termios.h> |
Stefan Hajnoczi | 13401ba | 2013-11-14 11:54:16 +0100 | [diff] [blame] | 31 | |
Laszlo Ersek | e2ea351 | 2013-05-18 06:31:48 +0200 | [diff] [blame] | 32 | #include <glib/gprintf.h> |
| 33 | |
Paolo Bonzini | 9c17d61 | 2012-12-17 18:20:04 +0100 | [diff] [blame] | 34 | #include "sysemu/sysemu.h" |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 35 | #include "trace.h" |
Markus Armbruster | da34e65 | 2016-03-14 09:01:28 +0100 | [diff] [blame] | 36 | #include "qapi/error.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 37 | #include "qemu/sockets.h" |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 38 | #include <libgen.h> |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 39 | #include <sys/signal.h> |
Veronia Bahaa | f348b6d | 2016-03-20 19:16:19 +0200 | [diff] [blame] | 40 | #include "qemu/cutils.h" |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 41 | |
Paolo Bonzini | cbcfa04 | 2011-09-12 16:20:11 +0200 | [diff] [blame] | 42 | #ifdef CONFIG_LINUX |
| 43 | #include <sys/syscall.h> |
| 44 | #endif |
Paolo Bonzini | cbcfa04 | 2011-09-12 16:20:11 +0200 | [diff] [blame] | 45 | |
Andreas Färber | 41975b2 | 2014-03-13 14:27:59 +0100 | [diff] [blame] | 46 | #ifdef __FreeBSD__ |
| 47 | #include <sys/sysctl.h> |
Ed Maste | a7764f1 | 2016-11-21 20:32:45 -0500 | [diff] [blame] | 48 | #include <sys/user.h> |
Michal Privoznik | 7dc9ae4 | 2016-09-27 17:24:56 +0200 | [diff] [blame] | 49 | #include <libutil.h> |
Andreas Färber | 41975b2 | 2014-03-13 14:27:59 +0100 | [diff] [blame] | 50 | #endif |
| 51 | |
Kamil Rytarowski | 094611b | 2017-10-28 21:48:33 +0200 | [diff] [blame] | 52 | #ifdef __NetBSD__ |
| 53 | #include <sys/sysctl.h> |
| 54 | #endif |
| 55 | |
Markus Armbruster | a9c9427 | 2016-06-22 19:11:19 +0200 | [diff] [blame] | 56 | #include "qemu/mmap-alloc.h" |
Michael S. Tsirkin | 794e8f3 | 2015-09-24 14:41:17 +0300 | [diff] [blame] | 57 | |
Peter Lieven | 7d992e4 | 2016-09-27 11:58:45 +0200 | [diff] [blame] | 58 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 59 | #include "qemu/error-report.h" |
| 60 | #endif |
| 61 | |
Jitendra Kolhe | dfd0dcc | 2017-03-21 02:50:06 -0400 | [diff] [blame] | 62 | #define MAX_MEM_PREALLOC_THREAD_COUNT 16 |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 63 | |
| 64 | struct MemsetThread { |
| 65 | char *addr; |
Stefan Weil | e947d47 | 2017-10-16 22:29:12 +0200 | [diff] [blame] | 66 | size_t numpages; |
| 67 | size_t hpagesize; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 68 | QemuThread pgthread; |
| 69 | sigjmp_buf env; |
| 70 | }; |
| 71 | typedef struct MemsetThread MemsetThread; |
| 72 | |
| 73 | static MemsetThread *memset_thread; |
| 74 | static int memset_num_threads; |
| 75 | static bool memset_thread_failed; |
| 76 | |
Paolo Bonzini | cbcfa04 | 2011-09-12 16:20:11 +0200 | [diff] [blame] | 77 | int qemu_get_thread_id(void) |
| 78 | { |
| 79 | #if defined(__linux__) |
| 80 | return syscall(SYS_gettid); |
| 81 | #else |
| 82 | return getpid(); |
| 83 | #endif |
| 84 | } |
Alexandre Raymond | f97742d | 2011-06-06 23:34:10 -0400 | [diff] [blame] | 85 | |
| 86 | int qemu_daemon(int nochdir, int noclose) |
| 87 | { |
| 88 | return daemon(nochdir, noclose); |
| 89 | } |
| 90 | |
Marc-André Lureau | 9e6bdef | 2018-08-31 16:53:12 +0200 | [diff] [blame] | 91 | bool qemu_write_pidfile(const char *path, Error **errp) |
| 92 | { |
| 93 | int fd; |
| 94 | char pidstr[32]; |
| 95 | |
| 96 | while (1) { |
| 97 | struct stat a, b; |
Marc-André Lureau | 35f7f3f | 2018-08-31 16:53:13 +0200 | [diff] [blame] | 98 | struct flock lock = { |
| 99 | .l_type = F_WRLCK, |
| 100 | .l_whence = SEEK_SET, |
| 101 | .l_len = 0, |
| 102 | }; |
Marc-André Lureau | 9e6bdef | 2018-08-31 16:53:12 +0200 | [diff] [blame] | 103 | |
| 104 | fd = qemu_open(path, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR); |
| 105 | if (fd == -1) { |
| 106 | error_setg_errno(errp, errno, "Cannot open pid file"); |
| 107 | return false; |
| 108 | } |
| 109 | |
| 110 | if (fstat(fd, &b) < 0) { |
| 111 | error_setg_errno(errp, errno, "Cannot stat file"); |
| 112 | goto fail_close; |
| 113 | } |
| 114 | |
Marc-André Lureau | 35f7f3f | 2018-08-31 16:53:13 +0200 | [diff] [blame] | 115 | if (fcntl(fd, F_SETLK, &lock)) { |
Marc-André Lureau | 9e6bdef | 2018-08-31 16:53:12 +0200 | [diff] [blame] | 116 | error_setg_errno(errp, errno, "Cannot lock pid file"); |
| 117 | goto fail_close; |
| 118 | } |
| 119 | |
| 120 | /* |
| 121 | * Now make sure the path we locked is the same one that now |
| 122 | * exists on the filesystem. |
| 123 | */ |
| 124 | if (stat(path, &a) < 0) { |
| 125 | /* |
| 126 | * PID file disappeared, someone else must be racing with |
| 127 | * us, so try again. |
| 128 | */ |
| 129 | close(fd); |
| 130 | continue; |
| 131 | } |
| 132 | |
| 133 | if (a.st_ino == b.st_ino) { |
| 134 | break; |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * PID file was recreated, someone else must be racing with |
| 139 | * us, so try again. |
| 140 | */ |
| 141 | close(fd); |
| 142 | } |
| 143 | |
| 144 | if (ftruncate(fd, 0) < 0) { |
| 145 | error_setg_errno(errp, errno, "Failed to truncate pid file"); |
| 146 | goto fail_unlink; |
| 147 | } |
| 148 | |
| 149 | snprintf(pidstr, sizeof(pidstr), FMT_pid "\n", getpid()); |
| 150 | if (write(fd, pidstr, strlen(pidstr)) != strlen(pidstr)) { |
| 151 | error_setg(errp, "Failed to write pid file"); |
| 152 | goto fail_unlink; |
| 153 | } |
| 154 | |
| 155 | return true; |
| 156 | |
| 157 | fail_unlink: |
| 158 | unlink(path); |
| 159 | fail_close: |
| 160 | close(fd); |
| 161 | return false; |
| 162 | } |
| 163 | |
Jes Sorensen | b152aa8 | 2010-10-26 10:39:26 +0200 | [diff] [blame] | 164 | void *qemu_oom_check(void *ptr) |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 165 | { |
| 166 | if (ptr == NULL) { |
| 167 | fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno)); |
| 168 | abort(); |
| 169 | } |
| 170 | return ptr; |
| 171 | } |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 172 | |
Kevin Wolf | 7d2a35c | 2014-05-20 12:24:05 +0200 | [diff] [blame] | 173 | void *qemu_try_memalign(size_t alignment, size_t size) |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 174 | { |
| 175 | void *ptr; |
Kevin Wolf | e535465 | 2013-11-29 21:29:17 +0100 | [diff] [blame] | 176 | |
| 177 | if (alignment < sizeof(void*)) { |
| 178 | alignment = sizeof(void*); |
| 179 | } |
| 180 | |
Andreas Gustafsson | 9bc5a71 | 2018-01-04 19:39:36 +0200 | [diff] [blame] | 181 | #if defined(CONFIG_POSIX_MEMALIGN) |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 182 | int ret; |
| 183 | ret = posix_memalign(&ptr, alignment, size); |
| 184 | if (ret != 0) { |
Kevin Wolf | 7d2a35c | 2014-05-20 12:24:05 +0200 | [diff] [blame] | 185 | errno = ret; |
| 186 | ptr = NULL; |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 187 | } |
| 188 | #elif defined(CONFIG_BSD) |
Kevin Wolf | 7d2a35c | 2014-05-20 12:24:05 +0200 | [diff] [blame] | 189 | ptr = valloc(size); |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 190 | #else |
Kevin Wolf | 7d2a35c | 2014-05-20 12:24:05 +0200 | [diff] [blame] | 191 | ptr = memalign(alignment, size); |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 192 | #endif |
| 193 | trace_qemu_memalign(alignment, size, ptr); |
| 194 | return ptr; |
| 195 | } |
| 196 | |
Kevin Wolf | 7d2a35c | 2014-05-20 12:24:05 +0200 | [diff] [blame] | 197 | void *qemu_memalign(size_t alignment, size_t size) |
| 198 | { |
| 199 | return qemu_oom_check(qemu_try_memalign(alignment, size)); |
| 200 | } |
| 201 | |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 202 | /* alloc shared memory pages */ |
Marcel Apfelbaum | 06329cc | 2017-12-13 16:37:37 +0200 | [diff] [blame] | 203 | void *qemu_anon_ram_alloc(size_t size, uint64_t *alignment, bool shared) |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 204 | { |
Avi Kivity | 36b5862 | 2011-09-05 11:07:05 +0300 | [diff] [blame] | 205 | size_t align = QEMU_VMALLOC_ALIGN; |
Marcel Apfelbaum | 06329cc | 2017-12-13 16:37:37 +0200 | [diff] [blame] | 206 | void *ptr = qemu_ram_mmap(-1, size, align, shared); |
Avi Kivity | 36b5862 | 2011-09-05 11:07:05 +0300 | [diff] [blame] | 207 | |
Paolo Bonzini | 7dda5dc | 2013-04-09 17:43:43 +0200 | [diff] [blame] | 208 | if (ptr == MAP_FAILED) { |
Markus Armbruster | 3922825 | 2013-07-31 15:11:11 +0200 | [diff] [blame] | 209 | return NULL; |
Stefan Weil | c2a8238 | 2011-10-31 21:29:46 +0100 | [diff] [blame] | 210 | } |
Stefan Weil | c2a8238 | 2011-10-31 21:29:46 +0100 | [diff] [blame] | 211 | |
Igor Mammedov | a2b257d | 2014-10-31 16:38:37 +0000 | [diff] [blame] | 212 | if (alignment) { |
| 213 | *alignment = align; |
| 214 | } |
Michael S. Tsirkin | c2dfc5b | 2015-09-10 16:36:51 +0300 | [diff] [blame] | 215 | |
Paolo Bonzini | 6eebf95 | 2013-05-13 16:19:55 +0200 | [diff] [blame] | 216 | trace_qemu_anon_ram_alloc(size, ptr); |
Jes Sorensen | c7f4111 | 2011-07-25 17:13:36 +0200 | [diff] [blame] | 217 | return ptr; |
Jes Sorensen | c1b0b93 | 2010-10-26 10:39:19 +0200 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | void qemu_vfree(void *ptr) |
| 221 | { |
| 222 | trace_qemu_vfree(ptr); |
| 223 | free(ptr); |
| 224 | } |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 225 | |
Paolo Bonzini | e7a09b9 | 2013-05-13 16:19:56 +0200 | [diff] [blame] | 226 | void qemu_anon_ram_free(void *ptr, size_t size) |
| 227 | { |
| 228 | trace_qemu_anon_ram_free(ptr, size); |
Michael S. Tsirkin | 794e8f3 | 2015-09-24 14:41:17 +0300 | [diff] [blame] | 229 | qemu_ram_munmap(ptr, size); |
Paolo Bonzini | e7a09b9 | 2013-05-13 16:19:56 +0200 | [diff] [blame] | 230 | } |
| 231 | |
Stefan Hajnoczi | f9e8cac | 2013-03-27 10:10:43 +0100 | [diff] [blame] | 232 | void qemu_set_block(int fd) |
Paolo Bonzini | 154b9a0 | 2011-10-05 09:17:32 +0200 | [diff] [blame] | 233 | { |
| 234 | int f; |
| 235 | f = fcntl(fd, F_GETFL); |
Li Qiang | da93b82 | 2018-12-15 04:03:53 -0800 | [diff] [blame^] | 236 | assert(f != -1); |
| 237 | f = fcntl(fd, F_SETFL, f & ~O_NONBLOCK); |
| 238 | assert(f != -1); |
Paolo Bonzini | 154b9a0 | 2011-10-05 09:17:32 +0200 | [diff] [blame] | 239 | } |
| 240 | |
Stefan Hajnoczi | f9e8cac | 2013-03-27 10:10:43 +0100 | [diff] [blame] | 241 | void qemu_set_nonblock(int fd) |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 242 | { |
| 243 | int f; |
| 244 | f = fcntl(fd, F_GETFL); |
Li Qiang | da93b82 | 2018-12-15 04:03:53 -0800 | [diff] [blame^] | 245 | assert(f != -1); |
| 246 | f = fcntl(fd, F_SETFL, f | O_NONBLOCK); |
| 247 | assert(f != -1); |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 248 | } |
| 249 | |
Sebastian Ottlik | 606600a | 2013-10-02 12:23:12 +0200 | [diff] [blame] | 250 | int socket_set_fast_reuse(int fd) |
| 251 | { |
| 252 | int val = 1, ret; |
| 253 | |
| 254 | ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, |
| 255 | (const char *)&val, sizeof(val)); |
| 256 | |
| 257 | assert(ret == 0); |
| 258 | |
| 259 | return ret; |
| 260 | } |
| 261 | |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 262 | void qemu_set_cloexec(int fd) |
| 263 | { |
| 264 | int f; |
| 265 | f = fcntl(fd, F_GETFD); |
Stefano Stabellini | 7e6478e | 2017-05-09 12:04:52 -0700 | [diff] [blame] | 266 | assert(f != -1); |
| 267 | f = fcntl(fd, F_SETFD, f | FD_CLOEXEC); |
| 268 | assert(f != -1); |
Jes Sorensen | 9549e76 | 2010-10-26 10:39:20 +0200 | [diff] [blame] | 269 | } |
Jes Sorensen | 70e72ce | 2010-10-26 10:39:21 +0200 | [diff] [blame] | 270 | |
| 271 | /* |
| 272 | * Creates a pipe with FD_CLOEXEC set on both file descriptors |
| 273 | */ |
| 274 | int qemu_pipe(int pipefd[2]) |
| 275 | { |
| 276 | int ret; |
| 277 | |
| 278 | #ifdef CONFIG_PIPE2 |
| 279 | ret = pipe2(pipefd, O_CLOEXEC); |
| 280 | if (ret != -1 || errno != ENOSYS) { |
| 281 | return ret; |
| 282 | } |
| 283 | #endif |
| 284 | ret = pipe(pipefd); |
| 285 | if (ret == 0) { |
| 286 | qemu_set_cloexec(pipefd[0]); |
| 287 | qemu_set_cloexec(pipefd[1]); |
| 288 | } |
| 289 | |
| 290 | return ret; |
| 291 | } |
Hidetoshi Seto | 3867142 | 2010-11-24 11:38:10 +0900 | [diff] [blame] | 292 | |
Laszlo Ersek | e2ea351 | 2013-05-18 06:31:48 +0200 | [diff] [blame] | 293 | char * |
| 294 | qemu_get_local_state_pathname(const char *relative_pathname) |
| 295 | { |
| 296 | return g_strdup_printf("%s/%s", CONFIG_QEMU_LOCALSTATEDIR, |
| 297 | relative_pathname); |
| 298 | } |
Stefan Hajnoczi | 13401ba | 2013-11-14 11:54:16 +0100 | [diff] [blame] | 299 | |
| 300 | void qemu_set_tty_echo(int fd, bool echo) |
| 301 | { |
| 302 | struct termios tty; |
| 303 | |
| 304 | tcgetattr(fd, &tty); |
| 305 | |
| 306 | if (echo) { |
| 307 | tty.c_lflag |= ECHO | ECHONL | ICANON | IEXTEN; |
| 308 | } else { |
| 309 | tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN); |
| 310 | } |
| 311 | |
| 312 | tcsetattr(fd, TCSANOW, &tty); |
| 313 | } |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 314 | |
| 315 | static char exec_dir[PATH_MAX]; |
| 316 | |
| 317 | void qemu_init_exec_dir(const char *argv0) |
| 318 | { |
| 319 | char *dir; |
| 320 | char *p = NULL; |
| 321 | char buf[PATH_MAX]; |
| 322 | |
| 323 | assert(!exec_dir[0]); |
| 324 | |
| 325 | #if defined(__linux__) |
| 326 | { |
| 327 | int len; |
| 328 | len = readlink("/proc/self/exe", buf, sizeof(buf) - 1); |
| 329 | if (len > 0) { |
| 330 | buf[len] = 0; |
| 331 | p = buf; |
| 332 | } |
| 333 | } |
Kamil Rytarowski | 094611b | 2017-10-28 21:48:33 +0200 | [diff] [blame] | 334 | #elif defined(__FreeBSD__) \ |
| 335 | || (defined(__NetBSD__) && defined(KERN_PROC_PATHNAME)) |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 336 | { |
Kamil Rytarowski | 094611b | 2017-10-28 21:48:33 +0200 | [diff] [blame] | 337 | #if defined(__FreeBSD__) |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 338 | static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; |
Kamil Rytarowski | 094611b | 2017-10-28 21:48:33 +0200 | [diff] [blame] | 339 | #else |
| 340 | static int mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME}; |
| 341 | #endif |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 342 | size_t len = sizeof(buf) - 1; |
| 343 | |
| 344 | *buf = '\0'; |
| 345 | if (!sysctl(mib, ARRAY_SIZE(mib), buf, &len, NULL, 0) && |
| 346 | *buf) { |
| 347 | buf[sizeof(buf) - 1] = '\0'; |
| 348 | p = buf; |
| 349 | } |
| 350 | } |
| 351 | #endif |
| 352 | /* If we don't have any way of figuring out the actual executable |
| 353 | location then try argv[0]. */ |
| 354 | if (!p) { |
| 355 | if (!argv0) { |
| 356 | return; |
| 357 | } |
| 358 | p = realpath(argv0, buf); |
| 359 | if (!p) { |
| 360 | return; |
| 361 | } |
| 362 | } |
Wei Jiangang | 55ad781 | 2016-04-07 10:46:24 +0800 | [diff] [blame] | 363 | dir = g_path_get_dirname(p); |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 364 | |
| 365 | pstrcpy(exec_dir, sizeof(exec_dir), dir); |
Wei Jiangang | 55ad781 | 2016-04-07 10:46:24 +0800 | [diff] [blame] | 366 | |
| 367 | g_free(dir); |
Fam Zheng | 10f5bff | 2014-02-10 14:48:51 +0800 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | char *qemu_get_exec_dir(void) |
| 371 | { |
| 372 | return g_strdup(exec_dir); |
| 373 | } |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 374 | |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 375 | static void sigbus_handler(int signal) |
| 376 | { |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 377 | int i; |
| 378 | if (memset_thread) { |
| 379 | for (i = 0; i < memset_num_threads; i++) { |
| 380 | if (qemu_thread_is_self(&memset_thread[i].pgthread)) { |
| 381 | siglongjmp(memset_thread[i].env, 1); |
| 382 | } |
| 383 | } |
| 384 | } |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 385 | } |
| 386 | |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 387 | static void *do_touch_pages(void *arg) |
| 388 | { |
| 389 | MemsetThread *memset_args = (MemsetThread *)arg; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 390 | sigset_t set, oldset; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 391 | |
| 392 | /* unblock SIGBUS */ |
| 393 | sigemptyset(&set); |
| 394 | sigaddset(&set, SIGBUS); |
| 395 | pthread_sigmask(SIG_UNBLOCK, &set, &oldset); |
| 396 | |
| 397 | if (sigsetjmp(memset_args->env, 1)) { |
| 398 | memset_thread_failed = true; |
| 399 | } else { |
Stefan Weil | e947d47 | 2017-10-16 22:29:12 +0200 | [diff] [blame] | 400 | char *addr = memset_args->addr; |
| 401 | size_t numpages = memset_args->numpages; |
| 402 | size_t hpagesize = memset_args->hpagesize; |
| 403 | size_t i; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 404 | for (i = 0; i < numpages; i++) { |
Daniel P. Berrange | 9dc44aa | 2017-03-03 11:32:55 +0000 | [diff] [blame] | 405 | /* |
| 406 | * Read & write back the same value, so we don't |
| 407 | * corrupt existing user/app data that might be |
| 408 | * stored. |
| 409 | * |
| 410 | * 'volatile' to stop compiler optimizing this away |
| 411 | * to a no-op |
| 412 | * |
| 413 | * TODO: get a better solution from kernel so we |
| 414 | * don't need to write at all so we don't cause |
| 415 | * wear on the storage backing the region... |
| 416 | */ |
| 417 | *(volatile char *)addr = *addr; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 418 | addr += hpagesize; |
| 419 | } |
| 420 | } |
| 421 | pthread_sigmask(SIG_SETMASK, &oldset, NULL); |
| 422 | return NULL; |
| 423 | } |
| 424 | |
Jitendra Kolhe | dfd0dcc | 2017-03-21 02:50:06 -0400 | [diff] [blame] | 425 | static inline int get_memset_num_threads(int smp_cpus) |
| 426 | { |
| 427 | long host_procs = sysconf(_SC_NPROCESSORS_ONLN); |
| 428 | int ret = 1; |
| 429 | |
| 430 | if (host_procs > 0) { |
| 431 | ret = MIN(MIN(host_procs, MAX_MEM_PREALLOC_THREAD_COUNT), smp_cpus); |
| 432 | } |
| 433 | /* In case sysconf() fails, we fall back to single threaded */ |
| 434 | return ret; |
| 435 | } |
| 436 | |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 437 | static bool touch_all_pages(char *area, size_t hpagesize, size_t numpages, |
| 438 | int smp_cpus) |
| 439 | { |
Stefan Weil | e947d47 | 2017-10-16 22:29:12 +0200 | [diff] [blame] | 440 | size_t numpages_per_thread; |
| 441 | size_t size_per_thread; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 442 | char *addr = area; |
| 443 | int i = 0; |
| 444 | |
| 445 | memset_thread_failed = false; |
Jitendra Kolhe | dfd0dcc | 2017-03-21 02:50:06 -0400 | [diff] [blame] | 446 | memset_num_threads = get_memset_num_threads(smp_cpus); |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 447 | memset_thread = g_new0(MemsetThread, memset_num_threads); |
| 448 | numpages_per_thread = (numpages / memset_num_threads); |
| 449 | size_per_thread = (hpagesize * numpages_per_thread); |
| 450 | for (i = 0; i < memset_num_threads; i++) { |
| 451 | memset_thread[i].addr = addr; |
| 452 | memset_thread[i].numpages = (i == (memset_num_threads - 1)) ? |
| 453 | numpages : numpages_per_thread; |
| 454 | memset_thread[i].hpagesize = hpagesize; |
| 455 | qemu_thread_create(&memset_thread[i].pgthread, "touch_pages", |
| 456 | do_touch_pages, &memset_thread[i], |
| 457 | QEMU_THREAD_JOINABLE); |
| 458 | addr += size_per_thread; |
| 459 | numpages -= numpages_per_thread; |
| 460 | } |
| 461 | for (i = 0; i < memset_num_threads; i++) { |
| 462 | qemu_thread_join(&memset_thread[i].pgthread); |
| 463 | } |
| 464 | g_free(memset_thread); |
| 465 | memset_thread = NULL; |
| 466 | |
| 467 | return memset_thread_failed; |
| 468 | } |
| 469 | |
| 470 | void os_mem_prealloc(int fd, char *area, size_t memory, int smp_cpus, |
| 471 | Error **errp) |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 472 | { |
Stefan Weil | b7bf8f5 | 2014-06-24 22:52:29 +0200 | [diff] [blame] | 473 | int ret; |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 474 | struct sigaction act, oldact; |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 475 | size_t hpagesize = qemu_fd_getpagesize(fd); |
| 476 | size_t numpages = DIV_ROUND_UP(memory, hpagesize); |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 477 | |
| 478 | memset(&act, 0, sizeof(act)); |
| 479 | act.sa_handler = &sigbus_handler; |
| 480 | act.sa_flags = 0; |
| 481 | |
| 482 | ret = sigaction(SIGBUS, &act, &oldact); |
| 483 | if (ret) { |
Igor Mammedov | 056b68a | 2016-07-20 11:54:03 +0200 | [diff] [blame] | 484 | error_setg_errno(errp, errno, |
| 485 | "os_mem_prealloc: failed to install signal handler"); |
| 486 | return; |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 487 | } |
| 488 | |
Jitendra Kolhe | 1e356fc | 2017-02-24 09:01:43 +0530 | [diff] [blame] | 489 | /* touch pages simultaneously */ |
| 490 | if (touch_all_pages(area, hpagesize, numpages, smp_cpus)) { |
Igor Mammedov | 056b68a | 2016-07-20 11:54:03 +0200 | [diff] [blame] | 491 | error_setg(errp, "os_mem_prealloc: Insufficient free host memory " |
Philippe Mathieu-Daudé | 462e5d5 | 2017-05-15 21:11:49 -0300 | [diff] [blame] | 492 | "pages available to allocate guest RAM"); |
Stefan Weil | b7bf8f5 | 2014-06-24 22:52:29 +0200 | [diff] [blame] | 493 | } |
Igor Mammedov | 056b68a | 2016-07-20 11:54:03 +0200 | [diff] [blame] | 494 | |
| 495 | ret = sigaction(SIGBUS, &oldact, NULL); |
| 496 | if (ret) { |
| 497 | /* Terminate QEMU since it can't recover from error */ |
| 498 | perror("os_mem_prealloc: failed to reinstall signal handler"); |
| 499 | exit(1); |
| 500 | } |
Paolo Bonzini | 3818331 | 2014-05-14 17:43:21 +0800 | [diff] [blame] | 501 | } |
Daniel P. Berrange | d57e4e4 | 2015-05-12 17:09:19 +0100 | [diff] [blame] | 502 | |
| 503 | |
Michal Privoznik | 7dc9ae4 | 2016-09-27 17:24:56 +0200 | [diff] [blame] | 504 | char *qemu_get_pid_name(pid_t pid) |
| 505 | { |
| 506 | char *name = NULL; |
| 507 | |
| 508 | #if defined(__FreeBSD__) |
| 509 | /* BSDs don't have /proc, but they provide a nice substitute */ |
| 510 | struct kinfo_proc *proc = kinfo_getproc(pid); |
| 511 | |
| 512 | if (proc) { |
| 513 | name = g_strdup(proc->ki_comm); |
| 514 | free(proc); |
| 515 | } |
| 516 | #else |
| 517 | /* Assume a system with reasonable procfs */ |
| 518 | char *pid_path; |
| 519 | size_t len; |
| 520 | |
| 521 | pid_path = g_strdup_printf("/proc/%d/cmdline", pid); |
| 522 | g_file_get_contents(pid_path, &name, &len, NULL); |
| 523 | g_free(pid_path); |
| 524 | #endif |
| 525 | |
| 526 | return name; |
| 527 | } |
| 528 | |
| 529 | |
Daniel P. Berrange | 57cb38b | 2015-08-28 14:40:01 +0100 | [diff] [blame] | 530 | pid_t qemu_fork(Error **errp) |
| 531 | { |
| 532 | sigset_t oldmask, newmask; |
| 533 | struct sigaction sig_action; |
| 534 | int saved_errno; |
| 535 | pid_t pid; |
| 536 | |
| 537 | /* |
| 538 | * Need to block signals now, so that child process can safely |
| 539 | * kill off caller's signal handlers without a race. |
| 540 | */ |
| 541 | sigfillset(&newmask); |
| 542 | if (pthread_sigmask(SIG_SETMASK, &newmask, &oldmask) != 0) { |
| 543 | error_setg_errno(errp, errno, |
| 544 | "cannot block signals"); |
| 545 | return -1; |
| 546 | } |
| 547 | |
| 548 | pid = fork(); |
| 549 | saved_errno = errno; |
| 550 | |
| 551 | if (pid < 0) { |
| 552 | /* attempt to restore signal mask, but ignore failure, to |
| 553 | * avoid obscuring the fork failure */ |
| 554 | (void)pthread_sigmask(SIG_SETMASK, &oldmask, NULL); |
| 555 | error_setg_errno(errp, saved_errno, |
| 556 | "cannot fork child process"); |
| 557 | errno = saved_errno; |
| 558 | return -1; |
| 559 | } else if (pid) { |
| 560 | /* parent process */ |
| 561 | |
| 562 | /* Restore our original signal mask now that the child is |
| 563 | * safely running. Only documented failures are EFAULT (not |
| 564 | * possible, since we are using just-grabbed mask) or EINVAL |
| 565 | * (not possible, since we are using correct arguments). */ |
| 566 | (void)pthread_sigmask(SIG_SETMASK, &oldmask, NULL); |
| 567 | } else { |
| 568 | /* child process */ |
| 569 | size_t i; |
| 570 | |
| 571 | /* Clear out all signal handlers from parent so nothing |
| 572 | * unexpected can happen in our child once we unblock |
| 573 | * signals */ |
| 574 | sig_action.sa_handler = SIG_DFL; |
| 575 | sig_action.sa_flags = 0; |
| 576 | sigemptyset(&sig_action.sa_mask); |
| 577 | |
| 578 | for (i = 1; i < NSIG; i++) { |
| 579 | /* Only possible errors are EFAULT or EINVAL The former |
| 580 | * won't happen, the latter we expect, so no need to check |
| 581 | * return value */ |
| 582 | (void)sigaction(i, &sig_action, NULL); |
| 583 | } |
| 584 | |
| 585 | /* Unmask all signals in child, since we've no idea what the |
| 586 | * caller's done with their signal mask and don't want to |
| 587 | * propagate that to children */ |
| 588 | sigemptyset(&newmask); |
| 589 | if (pthread_sigmask(SIG_SETMASK, &newmask, NULL) != 0) { |
| 590 | Error *local_err = NULL; |
| 591 | error_setg_errno(&local_err, errno, |
| 592 | "cannot unblock signals"); |
| 593 | error_report_err(local_err); |
| 594 | _exit(1); |
| 595 | } |
| 596 | } |
| 597 | return pid; |
| 598 | } |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 599 | |
| 600 | void *qemu_alloc_stack(size_t *sz) |
| 601 | { |
| 602 | void *ptr, *guardpage; |
Brad Smith | fc3d1ba | 2018-10-19 08:52:39 -0400 | [diff] [blame] | 603 | int flags; |
Peter Lieven | 7d992e4 | 2016-09-27 11:58:45 +0200 | [diff] [blame] | 604 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 605 | void *ptr2; |
| 606 | #endif |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 607 | size_t pagesz = getpagesize(); |
| 608 | #ifdef _SC_THREAD_STACK_MIN |
| 609 | /* avoid stacks smaller than _SC_THREAD_STACK_MIN */ |
| 610 | long min_stack_sz = sysconf(_SC_THREAD_STACK_MIN); |
| 611 | *sz = MAX(MAX(min_stack_sz, 0), *sz); |
| 612 | #endif |
| 613 | /* adjust stack size to a multiple of the page size */ |
| 614 | *sz = ROUND_UP(*sz, pagesz); |
| 615 | /* allocate one extra page for the guard page */ |
| 616 | *sz += pagesz; |
| 617 | |
Brad Smith | fc3d1ba | 2018-10-19 08:52:39 -0400 | [diff] [blame] | 618 | flags = MAP_PRIVATE | MAP_ANONYMOUS; |
| 619 | #if defined(MAP_STACK) && defined(__OpenBSD__) |
| 620 | /* Only enable MAP_STACK on OpenBSD. Other OS's such as |
| 621 | * Linux/FreeBSD/NetBSD have a flag with the same name |
| 622 | * but have differing functionality. OpenBSD will SEGV |
| 623 | * if it spots execution with a stack pointer pointing |
| 624 | * at memory that was not allocated with MAP_STACK. |
| 625 | */ |
| 626 | flags |= MAP_STACK; |
| 627 | #endif |
| 628 | |
| 629 | ptr = mmap(NULL, *sz, PROT_READ | PROT_WRITE, flags, -1, 0); |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 630 | if (ptr == MAP_FAILED) { |
Eduardo Habkost | e916a6e | 2017-08-29 18:20:53 -0300 | [diff] [blame] | 631 | perror("failed to allocate memory for stack"); |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 632 | abort(); |
| 633 | } |
| 634 | |
| 635 | #if defined(HOST_IA64) |
| 636 | /* separate register stack */ |
| 637 | guardpage = ptr + (((*sz - pagesz) / 2) & ~pagesz); |
| 638 | #elif defined(HOST_HPPA) |
| 639 | /* stack grows up */ |
| 640 | guardpage = ptr + *sz - pagesz; |
| 641 | #else |
| 642 | /* stack grows down */ |
| 643 | guardpage = ptr; |
| 644 | #endif |
| 645 | if (mprotect(guardpage, pagesz, PROT_NONE) != 0) { |
Eduardo Habkost | e916a6e | 2017-08-29 18:20:53 -0300 | [diff] [blame] | 646 | perror("failed to set up stack guard page"); |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 647 | abort(); |
| 648 | } |
| 649 | |
Peter Lieven | 7d992e4 | 2016-09-27 11:58:45 +0200 | [diff] [blame] | 650 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 651 | for (ptr2 = ptr + pagesz; ptr2 < ptr + *sz; ptr2 += sizeof(uint32_t)) { |
| 652 | *(uint32_t *)ptr2 = 0xdeadbeaf; |
| 653 | } |
| 654 | #endif |
| 655 | |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 656 | return ptr; |
| 657 | } |
| 658 | |
Peter Lieven | 7d992e4 | 2016-09-27 11:58:45 +0200 | [diff] [blame] | 659 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 660 | static __thread unsigned int max_stack_usage; |
| 661 | #endif |
| 662 | |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 663 | void qemu_free_stack(void *stack, size_t sz) |
| 664 | { |
Peter Lieven | 7d992e4 | 2016-09-27 11:58:45 +0200 | [diff] [blame] | 665 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 666 | unsigned int usage; |
| 667 | void *ptr; |
| 668 | |
| 669 | for (ptr = stack + getpagesize(); ptr < stack + sz; |
| 670 | ptr += sizeof(uint32_t)) { |
| 671 | if (*(uint32_t *)ptr != 0xdeadbeaf) { |
| 672 | break; |
| 673 | } |
| 674 | } |
| 675 | usage = sz - (uintptr_t) (ptr - stack); |
| 676 | if (usage > max_stack_usage) { |
| 677 | error_report("thread %d max stack usage increased from %u to %u", |
| 678 | qemu_get_thread_id(), max_stack_usage, usage); |
| 679 | max_stack_usage = usage; |
| 680 | } |
| 681 | #endif |
| 682 | |
Peter Lieven | 8737d9e | 2016-09-27 11:58:40 +0200 | [diff] [blame] | 683 | munmap(stack, sz); |
| 684 | } |
Paolo Bonzini | d98d407 | 2017-02-08 13:22:12 +0100 | [diff] [blame] | 685 | |
| 686 | void sigaction_invoke(struct sigaction *action, |
| 687 | struct qemu_signalfd_siginfo *info) |
| 688 | { |
Peter Maydell | 02ffa03 | 2017-07-20 17:32:21 +0100 | [diff] [blame] | 689 | siginfo_t si = {}; |
Paolo Bonzini | d98d407 | 2017-02-08 13:22:12 +0100 | [diff] [blame] | 690 | si.si_signo = info->ssi_signo; |
| 691 | si.si_errno = info->ssi_errno; |
| 692 | si.si_code = info->ssi_code; |
| 693 | |
| 694 | /* Convert the minimal set of fields defined by POSIX. |
| 695 | * Positive si_code values are reserved for kernel-generated |
| 696 | * signals, where the valid siginfo fields are determined by |
| 697 | * the signal number. But according to POSIX, it is unspecified |
| 698 | * whether SI_USER and SI_QUEUE have values less than or equal to |
| 699 | * zero. |
| 700 | */ |
| 701 | if (info->ssi_code == SI_USER || info->ssi_code == SI_QUEUE || |
| 702 | info->ssi_code <= 0) { |
| 703 | /* SIGTERM, etc. */ |
| 704 | si.si_pid = info->ssi_pid; |
| 705 | si.si_uid = info->ssi_uid; |
| 706 | } else if (info->ssi_signo == SIGILL || info->ssi_signo == SIGFPE || |
| 707 | info->ssi_signo == SIGSEGV || info->ssi_signo == SIGBUS) { |
| 708 | si.si_addr = (void *)(uintptr_t)info->ssi_addr; |
| 709 | } else if (info->ssi_signo == SIGCHLD) { |
| 710 | si.si_pid = info->ssi_pid; |
| 711 | si.si_status = info->ssi_status; |
| 712 | si.si_uid = info->ssi_uid; |
Paolo Bonzini | d98d407 | 2017-02-08 13:22:12 +0100 | [diff] [blame] | 713 | } |
| 714 | action->sa_sigaction(info->ssi_signo, &si, NULL); |
| 715 | } |