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296af7c9 BS |
1 | /* |
2 | * QEMU System Emulator | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | ||
25 | /* Needed early for CONFIG_BSD etc. */ | |
26 | #include "config-host.h" | |
27 | ||
28 | #include "monitor.h" | |
29 | #include "sysemu.h" | |
30 | #include "gdbstub.h" | |
31 | #include "dma.h" | |
32 | #include "kvm.h" | |
262ea18e | 33 | #include "exec-all.h" |
296af7c9 BS |
34 | |
35 | #include "cpus.h" | |
a8486bc9 | 36 | #include "compatfd.h" |
296af7c9 | 37 | |
7277e027 BS |
38 | #ifdef SIGRTMIN |
39 | #define SIG_IPI (SIGRTMIN+4) | |
40 | #else | |
41 | #define SIG_IPI SIGUSR1 | |
42 | #endif | |
43 | ||
6d9cb73c JK |
44 | #ifdef CONFIG_LINUX |
45 | ||
46 | #include <sys/prctl.h> | |
47 | ||
c0532a76 MT |
48 | #ifndef PR_MCE_KILL |
49 | #define PR_MCE_KILL 33 | |
50 | #endif | |
51 | ||
6d9cb73c JK |
52 | #ifndef PR_MCE_KILL_SET |
53 | #define PR_MCE_KILL_SET 1 | |
54 | #endif | |
55 | ||
56 | #ifndef PR_MCE_KILL_EARLY | |
57 | #define PR_MCE_KILL_EARLY 1 | |
58 | #endif | |
59 | ||
60 | #endif /* CONFIG_LINUX */ | |
61 | ||
296af7c9 BS |
62 | static CPUState *next_cpu; |
63 | ||
64 | /***********************************************************/ | |
65 | void hw_error(const char *fmt, ...) | |
66 | { | |
67 | va_list ap; | |
68 | CPUState *env; | |
69 | ||
70 | va_start(ap, fmt); | |
71 | fprintf(stderr, "qemu: hardware error: "); | |
72 | vfprintf(stderr, fmt, ap); | |
73 | fprintf(stderr, "\n"); | |
74 | for(env = first_cpu; env != NULL; env = env->next_cpu) { | |
75 | fprintf(stderr, "CPU #%d:\n", env->cpu_index); | |
76 | #ifdef TARGET_I386 | |
77 | cpu_dump_state(env, stderr, fprintf, X86_DUMP_FPU); | |
78 | #else | |
79 | cpu_dump_state(env, stderr, fprintf, 0); | |
80 | #endif | |
81 | } | |
82 | va_end(ap); | |
83 | abort(); | |
84 | } | |
85 | ||
86 | void cpu_synchronize_all_states(void) | |
87 | { | |
88 | CPUState *cpu; | |
89 | ||
90 | for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) { | |
91 | cpu_synchronize_state(cpu); | |
92 | } | |
93 | } | |
94 | ||
95 | void cpu_synchronize_all_post_reset(void) | |
96 | { | |
97 | CPUState *cpu; | |
98 | ||
99 | for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) { | |
100 | cpu_synchronize_post_reset(cpu); | |
101 | } | |
102 | } | |
103 | ||
104 | void cpu_synchronize_all_post_init(void) | |
105 | { | |
106 | CPUState *cpu; | |
107 | ||
108 | for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) { | |
109 | cpu_synchronize_post_init(cpu); | |
110 | } | |
111 | } | |
112 | ||
3ae9501c MT |
113 | int cpu_is_stopped(CPUState *env) |
114 | { | |
115 | return !vm_running || env->stopped; | |
116 | } | |
117 | ||
296af7c9 BS |
118 | static void do_vm_stop(int reason) |
119 | { | |
120 | if (vm_running) { | |
121 | cpu_disable_ticks(); | |
122 | vm_running = 0; | |
123 | pause_all_vcpus(); | |
124 | vm_state_notify(0, reason); | |
55df6f33 MT |
125 | qemu_aio_flush(); |
126 | bdrv_flush_all(); | |
296af7c9 BS |
127 | monitor_protocol_event(QEVENT_STOP, NULL); |
128 | } | |
129 | } | |
130 | ||
131 | static int cpu_can_run(CPUState *env) | |
132 | { | |
133 | if (env->stop) | |
134 | return 0; | |
55274a30 | 135 | if (env->stopped || !vm_running) |
296af7c9 BS |
136 | return 0; |
137 | return 1; | |
138 | } | |
139 | ||
140 | static int cpu_has_work(CPUState *env) | |
141 | { | |
142 | if (env->stop) | |
143 | return 1; | |
e82bcec2 MT |
144 | if (env->queued_work_first) |
145 | return 1; | |
55274a30 | 146 | if (env->stopped || !vm_running) |
296af7c9 BS |
147 | return 0; |
148 | if (!env->halted) | |
149 | return 1; | |
150 | if (qemu_cpu_has_work(env)) | |
151 | return 1; | |
152 | return 0; | |
153 | } | |
154 | ||
472fb0c4 | 155 | static int any_cpu_has_work(void) |
296af7c9 BS |
156 | { |
157 | CPUState *env; | |
158 | ||
159 | for (env = first_cpu; env != NULL; env = env->next_cpu) | |
160 | if (cpu_has_work(env)) | |
161 | return 1; | |
162 | return 0; | |
163 | } | |
164 | ||
3c638d06 JK |
165 | static void cpu_debug_handler(CPUState *env) |
166 | { | |
167 | gdb_set_stop_cpu(env); | |
168 | debug_requested = EXCP_DEBUG; | |
169 | vm_stop(EXCP_DEBUG); | |
170 | } | |
171 | ||
6d9cb73c JK |
172 | #ifdef CONFIG_LINUX |
173 | static void sigbus_reraise(void) | |
174 | { | |
175 | sigset_t set; | |
176 | struct sigaction action; | |
177 | ||
178 | memset(&action, 0, sizeof(action)); | |
179 | action.sa_handler = SIG_DFL; | |
180 | if (!sigaction(SIGBUS, &action, NULL)) { | |
181 | raise(SIGBUS); | |
182 | sigemptyset(&set); | |
183 | sigaddset(&set, SIGBUS); | |
184 | sigprocmask(SIG_UNBLOCK, &set, NULL); | |
185 | } | |
186 | perror("Failed to re-raise SIGBUS!\n"); | |
187 | abort(); | |
188 | } | |
189 | ||
190 | static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo, | |
191 | void *ctx) | |
192 | { | |
193 | if (kvm_on_sigbus(siginfo->ssi_code, | |
194 | (void *)(intptr_t)siginfo->ssi_addr)) { | |
195 | sigbus_reraise(); | |
196 | } | |
197 | } | |
198 | ||
199 | static void qemu_init_sigbus(void) | |
200 | { | |
201 | struct sigaction action; | |
202 | ||
203 | memset(&action, 0, sizeof(action)); | |
204 | action.sa_flags = SA_SIGINFO; | |
205 | action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler; | |
206 | sigaction(SIGBUS, &action, NULL); | |
207 | ||
208 | prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0); | |
209 | } | |
210 | ||
211 | #else /* !CONFIG_LINUX */ | |
212 | ||
213 | static void qemu_init_sigbus(void) | |
214 | { | |
215 | } | |
216 | #endif /* !CONFIG_LINUX */ | |
217 | ||
296af7c9 BS |
218 | #ifndef _WIN32 |
219 | static int io_thread_fd = -1; | |
220 | ||
221 | static void qemu_event_increment(void) | |
222 | { | |
223 | /* Write 8 bytes to be compatible with eventfd. */ | |
26a82330 | 224 | static const uint64_t val = 1; |
296af7c9 BS |
225 | ssize_t ret; |
226 | ||
227 | if (io_thread_fd == -1) | |
228 | return; | |
229 | ||
230 | do { | |
231 | ret = write(io_thread_fd, &val, sizeof(val)); | |
232 | } while (ret < 0 && errno == EINTR); | |
233 | ||
234 | /* EAGAIN is fine, a read must be pending. */ | |
235 | if (ret < 0 && errno != EAGAIN) { | |
236 | fprintf(stderr, "qemu_event_increment: write() filed: %s\n", | |
237 | strerror(errno)); | |
238 | exit (1); | |
239 | } | |
240 | } | |
241 | ||
242 | static void qemu_event_read(void *opaque) | |
243 | { | |
244 | int fd = (unsigned long)opaque; | |
245 | ssize_t len; | |
246 | char buffer[512]; | |
247 | ||
248 | /* Drain the notify pipe. For eventfd, only 8 bytes will be read. */ | |
249 | do { | |
250 | len = read(fd, buffer, sizeof(buffer)); | |
251 | } while ((len == -1 && errno == EINTR) || len == sizeof(buffer)); | |
252 | } | |
253 | ||
254 | static int qemu_event_init(void) | |
255 | { | |
256 | int err; | |
257 | int fds[2]; | |
258 | ||
259 | err = qemu_eventfd(fds); | |
260 | if (err == -1) | |
261 | return -errno; | |
262 | ||
263 | err = fcntl_setfl(fds[0], O_NONBLOCK); | |
264 | if (err < 0) | |
265 | goto fail; | |
266 | ||
267 | err = fcntl_setfl(fds[1], O_NONBLOCK); | |
268 | if (err < 0) | |
269 | goto fail; | |
270 | ||
271 | qemu_set_fd_handler2(fds[0], NULL, qemu_event_read, NULL, | |
272 | (void *)(unsigned long)fds[0]); | |
273 | ||
274 | io_thread_fd = fds[1]; | |
275 | return 0; | |
276 | ||
277 | fail: | |
278 | close(fds[0]); | |
279 | close(fds[1]); | |
280 | return err; | |
281 | } | |
55f8d6ac | 282 | |
55f8d6ac JK |
283 | static void dummy_signal(int sig) |
284 | { | |
285 | } | |
55f8d6ac | 286 | |
d0f294ce JK |
287 | /* If we have signalfd, we mask out the signals we want to handle and then |
288 | * use signalfd to listen for them. We rely on whatever the current signal | |
289 | * handler is to dispatch the signals when we receive them. | |
290 | */ | |
291 | static void sigfd_handler(void *opaque) | |
292 | { | |
293 | int fd = (unsigned long) opaque; | |
294 | struct qemu_signalfd_siginfo info; | |
295 | struct sigaction action; | |
296 | ssize_t len; | |
297 | ||
298 | while (1) { | |
299 | do { | |
300 | len = read(fd, &info, sizeof(info)); | |
301 | } while (len == -1 && errno == EINTR); | |
302 | ||
303 | if (len == -1 && errno == EAGAIN) { | |
304 | break; | |
305 | } | |
306 | ||
307 | if (len != sizeof(info)) { | |
308 | printf("read from sigfd returned %zd: %m\n", len); | |
309 | return; | |
310 | } | |
311 | ||
312 | sigaction(info.ssi_signo, NULL, &action); | |
313 | if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) { | |
314 | action.sa_sigaction(info.ssi_signo, | |
315 | (siginfo_t *)&info, NULL); | |
316 | } else if (action.sa_handler) { | |
317 | action.sa_handler(info.ssi_signo); | |
318 | } | |
319 | } | |
320 | } | |
321 | ||
322 | static int qemu_signalfd_init(sigset_t mask) | |
323 | { | |
324 | int sigfd; | |
325 | ||
326 | sigfd = qemu_signalfd(&mask); | |
327 | if (sigfd == -1) { | |
328 | fprintf(stderr, "failed to create signalfd\n"); | |
329 | return -errno; | |
330 | } | |
331 | ||
332 | fcntl_setfl(sigfd, O_NONBLOCK); | |
333 | ||
334 | qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, | |
335 | (void *)(unsigned long) sigfd); | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
9a36085b JK |
340 | static void qemu_kvm_eat_signals(CPUState *env) |
341 | { | |
342 | struct timespec ts = { 0, 0 }; | |
343 | siginfo_t siginfo; | |
344 | sigset_t waitset; | |
345 | sigset_t chkset; | |
346 | int r; | |
347 | ||
348 | sigemptyset(&waitset); | |
349 | sigaddset(&waitset, SIG_IPI); | |
350 | sigaddset(&waitset, SIGBUS); | |
351 | ||
352 | do { | |
353 | r = sigtimedwait(&waitset, &siginfo, &ts); | |
354 | if (r == -1 && !(errno == EAGAIN || errno == EINTR)) { | |
355 | perror("sigtimedwait"); | |
356 | exit(1); | |
357 | } | |
358 | ||
359 | switch (r) { | |
9a36085b JK |
360 | case SIGBUS: |
361 | if (kvm_on_sigbus_vcpu(env, siginfo.si_code, siginfo.si_addr)) { | |
362 | sigbus_reraise(); | |
363 | } | |
364 | break; | |
9a36085b JK |
365 | default: |
366 | break; | |
367 | } | |
368 | ||
369 | r = sigpending(&chkset); | |
370 | if (r == -1) { | |
371 | perror("sigpending"); | |
372 | exit(1); | |
373 | } | |
374 | } while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS)); | |
de758970 JK |
375 | |
376 | #ifndef CONFIG_IOTHREAD | |
377 | if (sigismember(&chkset, SIGIO) || sigismember(&chkset, SIGALRM)) { | |
378 | qemu_notify_event(); | |
379 | } | |
380 | #endif | |
9a36085b JK |
381 | } |
382 | ||
55f8d6ac JK |
383 | #else /* _WIN32 */ |
384 | ||
296af7c9 BS |
385 | HANDLE qemu_event_handle; |
386 | ||
387 | static void dummy_event_handler(void *opaque) | |
388 | { | |
389 | } | |
390 | ||
391 | static int qemu_event_init(void) | |
392 | { | |
393 | qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL); | |
394 | if (!qemu_event_handle) { | |
395 | fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError()); | |
396 | return -1; | |
397 | } | |
398 | qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL); | |
399 | return 0; | |
400 | } | |
401 | ||
402 | static void qemu_event_increment(void) | |
403 | { | |
404 | if (!SetEvent(qemu_event_handle)) { | |
405 | fprintf(stderr, "qemu_event_increment: SetEvent failed: %ld\n", | |
406 | GetLastError()); | |
407 | exit (1); | |
408 | } | |
409 | } | |
9a36085b JK |
410 | |
411 | static void qemu_kvm_eat_signals(CPUState *env) | |
412 | { | |
413 | } | |
55f8d6ac | 414 | #endif /* _WIN32 */ |
296af7c9 BS |
415 | |
416 | #ifndef CONFIG_IOTHREAD | |
ff48eb5f JK |
417 | static void qemu_kvm_init_cpu_signals(CPUState *env) |
418 | { | |
419 | #ifndef _WIN32 | |
420 | int r; | |
421 | sigset_t set; | |
422 | struct sigaction sigact; | |
423 | ||
424 | memset(&sigact, 0, sizeof(sigact)); | |
425 | sigact.sa_handler = dummy_signal; | |
426 | sigaction(SIG_IPI, &sigact, NULL); | |
427 | ||
428 | sigemptyset(&set); | |
429 | sigaddset(&set, SIG_IPI); | |
de758970 JK |
430 | sigaddset(&set, SIGIO); |
431 | sigaddset(&set, SIGALRM); | |
ff48eb5f JK |
432 | pthread_sigmask(SIG_BLOCK, &set, NULL); |
433 | ||
434 | pthread_sigmask(SIG_BLOCK, NULL, &set); | |
435 | sigdelset(&set, SIG_IPI); | |
436 | sigdelset(&set, SIGBUS); | |
de758970 JK |
437 | sigdelset(&set, SIGIO); |
438 | sigdelset(&set, SIGALRM); | |
ff48eb5f JK |
439 | r = kvm_set_signal_mask(env, &set); |
440 | if (r) { | |
441 | fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r)); | |
442 | exit(1); | |
443 | } | |
444 | #endif | |
445 | } | |
446 | ||
de758970 JK |
447 | #ifndef _WIN32 |
448 | static sigset_t block_synchronous_signals(void) | |
449 | { | |
450 | sigset_t set; | |
451 | ||
452 | sigemptyset(&set); | |
6d9cb73c | 453 | sigaddset(&set, SIGBUS); |
de758970 JK |
454 | if (kvm_enabled()) { |
455 | /* | |
456 | * We need to process timer signals synchronously to avoid a race | |
457 | * between exit_request check and KVM vcpu entry. | |
458 | */ | |
459 | sigaddset(&set, SIGIO); | |
460 | sigaddset(&set, SIGALRM); | |
461 | } | |
462 | ||
463 | return set; | |
464 | } | |
465 | #endif | |
466 | ||
296af7c9 BS |
467 | int qemu_init_main_loop(void) |
468 | { | |
d0f294ce JK |
469 | #ifndef _WIN32 |
470 | sigset_t blocked_signals; | |
471 | int ret; | |
472 | ||
de758970 | 473 | blocked_signals = block_synchronous_signals(); |
d0f294ce JK |
474 | |
475 | ret = qemu_signalfd_init(blocked_signals); | |
476 | if (ret) { | |
477 | return ret; | |
478 | } | |
479 | #endif | |
3c638d06 JK |
480 | cpu_set_debug_excp_handler(cpu_debug_handler); |
481 | ||
6d9cb73c JK |
482 | qemu_init_sigbus(); |
483 | ||
296af7c9 BS |
484 | return qemu_event_init(); |
485 | } | |
486 | ||
7277e027 BS |
487 | void qemu_main_loop_start(void) |
488 | { | |
489 | } | |
490 | ||
296af7c9 BS |
491 | void qemu_init_vcpu(void *_env) |
492 | { | |
493 | CPUState *env = _env; | |
84b4915d | 494 | int r; |
296af7c9 BS |
495 | |
496 | env->nr_cores = smp_cores; | |
497 | env->nr_threads = smp_threads; | |
84b4915d JK |
498 | |
499 | if (kvm_enabled()) { | |
500 | r = kvm_init_vcpu(env); | |
501 | if (r < 0) { | |
502 | fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r)); | |
503 | exit(1); | |
504 | } | |
ff48eb5f | 505 | qemu_kvm_init_cpu_signals(env); |
84b4915d | 506 | } |
296af7c9 BS |
507 | } |
508 | ||
509 | int qemu_cpu_self(void *env) | |
510 | { | |
511 | return 1; | |
512 | } | |
513 | ||
e82bcec2 MT |
514 | void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
515 | { | |
516 | func(data); | |
517 | } | |
518 | ||
296af7c9 BS |
519 | void resume_all_vcpus(void) |
520 | { | |
521 | } | |
522 | ||
523 | void pause_all_vcpus(void) | |
524 | { | |
525 | } | |
526 | ||
527 | void qemu_cpu_kick(void *env) | |
528 | { | |
529 | return; | |
530 | } | |
531 | ||
46d62fac JK |
532 | void qemu_cpu_kick_self(void) |
533 | { | |
534 | #ifndef _WIN32 | |
535 | assert(cpu_single_env); | |
536 | ||
537 | raise(SIG_IPI); | |
538 | #else | |
539 | abort(); | |
540 | #endif | |
541 | } | |
542 | ||
296af7c9 BS |
543 | void qemu_notify_event(void) |
544 | { | |
545 | CPUState *env = cpu_single_env; | |
546 | ||
547 | qemu_event_increment (); | |
548 | if (env) { | |
549 | cpu_exit(env); | |
550 | } | |
551 | if (next_cpu && env != next_cpu) { | |
552 | cpu_exit(next_cpu); | |
553 | } | |
38145df2 | 554 | exit_request = 1; |
296af7c9 BS |
555 | } |
556 | ||
557 | void qemu_mutex_lock_iothread(void) {} | |
558 | void qemu_mutex_unlock_iothread(void) {} | |
559 | ||
b4a3d965 JK |
560 | void cpu_stop_current(void) |
561 | { | |
562 | } | |
563 | ||
296af7c9 BS |
564 | void vm_stop(int reason) |
565 | { | |
566 | do_vm_stop(reason); | |
567 | } | |
568 | ||
569 | #else /* CONFIG_IOTHREAD */ | |
570 | ||
571 | #include "qemu-thread.h" | |
572 | ||
573 | QemuMutex qemu_global_mutex; | |
574 | static QemuMutex qemu_fair_mutex; | |
575 | ||
576 | static QemuThread io_thread; | |
577 | ||
578 | static QemuThread *tcg_cpu_thread; | |
579 | static QemuCond *tcg_halt_cond; | |
580 | ||
581 | static int qemu_system_ready; | |
582 | /* cpu creation */ | |
583 | static QemuCond qemu_cpu_cond; | |
584 | /* system init */ | |
585 | static QemuCond qemu_system_cond; | |
586 | static QemuCond qemu_pause_cond; | |
e82bcec2 | 587 | static QemuCond qemu_work_cond; |
296af7c9 | 588 | |
55f8d6ac JK |
589 | static void cpu_signal(int sig) |
590 | { | |
591 | if (cpu_single_env) { | |
592 | cpu_exit(cpu_single_env); | |
593 | } | |
594 | exit_request = 1; | |
595 | } | |
596 | ||
597 | static void qemu_kvm_init_cpu_signals(CPUState *env) | |
598 | { | |
599 | int r; | |
600 | sigset_t set; | |
601 | struct sigaction sigact; | |
602 | ||
603 | memset(&sigact, 0, sizeof(sigact)); | |
604 | sigact.sa_handler = dummy_signal; | |
605 | sigaction(SIG_IPI, &sigact, NULL); | |
606 | ||
607 | pthread_sigmask(SIG_BLOCK, NULL, &set); | |
608 | sigdelset(&set, SIG_IPI); | |
609 | sigdelset(&set, SIGBUS); | |
610 | r = kvm_set_signal_mask(env, &set); | |
611 | if (r) { | |
612 | fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r)); | |
613 | exit(1); | |
614 | } | |
615 | } | |
616 | ||
617 | static void qemu_tcg_init_cpu_signals(void) | |
618 | { | |
619 | sigset_t set; | |
620 | struct sigaction sigact; | |
621 | ||
622 | memset(&sigact, 0, sizeof(sigact)); | |
623 | sigact.sa_handler = cpu_signal; | |
624 | sigaction(SIG_IPI, &sigact, NULL); | |
625 | ||
626 | sigemptyset(&set); | |
627 | sigaddset(&set, SIG_IPI); | |
628 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); | |
629 | } | |
630 | ||
55f8d6ac JK |
631 | static sigset_t block_io_signals(void) |
632 | { | |
633 | sigset_t set; | |
55f8d6ac JK |
634 | |
635 | /* SIGUSR2 used by posix-aio-compat.c */ | |
636 | sigemptyset(&set); | |
637 | sigaddset(&set, SIGUSR2); | |
638 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); | |
639 | ||
640 | sigemptyset(&set); | |
641 | sigaddset(&set, SIGIO); | |
642 | sigaddset(&set, SIGALRM); | |
643 | sigaddset(&set, SIG_IPI); | |
644 | sigaddset(&set, SIGBUS); | |
645 | pthread_sigmask(SIG_BLOCK, &set, NULL); | |
646 | ||
55f8d6ac JK |
647 | return set; |
648 | } | |
649 | ||
296af7c9 BS |
650 | int qemu_init_main_loop(void) |
651 | { | |
652 | int ret; | |
a8486bc9 | 653 | sigset_t blocked_signals; |
296af7c9 | 654 | |
3c638d06 JK |
655 | cpu_set_debug_excp_handler(cpu_debug_handler); |
656 | ||
6d9cb73c JK |
657 | qemu_init_sigbus(); |
658 | ||
a8486bc9 MT |
659 | blocked_signals = block_io_signals(); |
660 | ||
661 | ret = qemu_signalfd_init(blocked_signals); | |
662 | if (ret) | |
663 | return ret; | |
664 | ||
665 | /* Note eventfd must be drained before signalfd handlers run */ | |
296af7c9 BS |
666 | ret = qemu_event_init(); |
667 | if (ret) | |
668 | return ret; | |
669 | ||
670 | qemu_cond_init(&qemu_pause_cond); | |
f8ca7b43 | 671 | qemu_cond_init(&qemu_system_cond); |
296af7c9 BS |
672 | qemu_mutex_init(&qemu_fair_mutex); |
673 | qemu_mutex_init(&qemu_global_mutex); | |
674 | qemu_mutex_lock(&qemu_global_mutex); | |
675 | ||
296af7c9 BS |
676 | qemu_thread_self(&io_thread); |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
7277e027 BS |
681 | void qemu_main_loop_start(void) |
682 | { | |
683 | qemu_system_ready = 1; | |
684 | qemu_cond_broadcast(&qemu_system_cond); | |
685 | } | |
686 | ||
e82bcec2 MT |
687 | void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
688 | { | |
689 | struct qemu_work_item wi; | |
690 | ||
691 | if (qemu_cpu_self(env)) { | |
692 | func(data); | |
693 | return; | |
694 | } | |
695 | ||
696 | wi.func = func; | |
697 | wi.data = data; | |
698 | if (!env->queued_work_first) | |
699 | env->queued_work_first = &wi; | |
700 | else | |
701 | env->queued_work_last->next = &wi; | |
702 | env->queued_work_last = &wi; | |
703 | wi.next = NULL; | |
704 | wi.done = false; | |
705 | ||
706 | qemu_cpu_kick(env); | |
707 | while (!wi.done) { | |
708 | CPUState *self_env = cpu_single_env; | |
709 | ||
710 | qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex); | |
711 | cpu_single_env = self_env; | |
712 | } | |
713 | } | |
714 | ||
715 | static void flush_queued_work(CPUState *env) | |
716 | { | |
717 | struct qemu_work_item *wi; | |
718 | ||
719 | if (!env->queued_work_first) | |
720 | return; | |
721 | ||
722 | while ((wi = env->queued_work_first)) { | |
723 | env->queued_work_first = wi->next; | |
724 | wi->func(wi->data); | |
725 | wi->done = true; | |
726 | } | |
727 | env->queued_work_last = NULL; | |
728 | qemu_cond_broadcast(&qemu_work_cond); | |
729 | } | |
730 | ||
296af7c9 BS |
731 | static void qemu_wait_io_event_common(CPUState *env) |
732 | { | |
733 | if (env->stop) { | |
734 | env->stop = 0; | |
735 | env->stopped = 1; | |
736 | qemu_cond_signal(&qemu_pause_cond); | |
737 | } | |
e82bcec2 | 738 | flush_queued_work(env); |
aa2c364b | 739 | env->thread_kicked = false; |
296af7c9 BS |
740 | } |
741 | ||
6cabe1f3 | 742 | static void qemu_tcg_wait_io_event(void) |
296af7c9 | 743 | { |
6cabe1f3 JK |
744 | CPUState *env; |
745 | ||
472fb0c4 | 746 | while (!any_cpu_has_work()) |
6cabe1f3 | 747 | qemu_cond_timedwait(tcg_halt_cond, &qemu_global_mutex, 1000); |
296af7c9 BS |
748 | |
749 | qemu_mutex_unlock(&qemu_global_mutex); | |
750 | ||
751 | /* | |
752 | * Users of qemu_global_mutex can be starved, having no chance | |
753 | * to acquire it since this path will get to it first. | |
754 | * So use another lock to provide fairness. | |
755 | */ | |
756 | qemu_mutex_lock(&qemu_fair_mutex); | |
757 | qemu_mutex_unlock(&qemu_fair_mutex); | |
758 | ||
759 | qemu_mutex_lock(&qemu_global_mutex); | |
6cabe1f3 JK |
760 | |
761 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
762 | qemu_wait_io_event_common(env); | |
763 | } | |
296af7c9 BS |
764 | } |
765 | ||
296af7c9 BS |
766 | static void qemu_kvm_wait_io_event(CPUState *env) |
767 | { | |
768 | while (!cpu_has_work(env)) | |
769 | qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000); | |
770 | ||
5db5bdac | 771 | qemu_kvm_eat_signals(env); |
296af7c9 BS |
772 | qemu_wait_io_event_common(env); |
773 | } | |
774 | ||
775 | static int qemu_cpu_exec(CPUState *env); | |
776 | ||
777 | static void *kvm_cpu_thread_fn(void *arg) | |
778 | { | |
779 | CPUState *env = arg; | |
84b4915d | 780 | int r; |
296af7c9 | 781 | |
6164e6d6 | 782 | qemu_mutex_lock(&qemu_global_mutex); |
296af7c9 | 783 | qemu_thread_self(env->thread); |
d31ae052 | 784 | |
84b4915d JK |
785 | r = kvm_init_vcpu(env); |
786 | if (r < 0) { | |
787 | fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r)); | |
788 | exit(1); | |
789 | } | |
296af7c9 | 790 | |
55f8d6ac | 791 | qemu_kvm_init_cpu_signals(env); |
296af7c9 BS |
792 | |
793 | /* signal CPU creation */ | |
296af7c9 BS |
794 | env->created = 1; |
795 | qemu_cond_signal(&qemu_cpu_cond); | |
796 | ||
797 | /* and wait for machine initialization */ | |
798 | while (!qemu_system_ready) | |
799 | qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100); | |
800 | ||
801 | while (1) { | |
802 | if (cpu_can_run(env)) | |
803 | qemu_cpu_exec(env); | |
804 | qemu_kvm_wait_io_event(env); | |
805 | } | |
806 | ||
807 | return NULL; | |
808 | } | |
809 | ||
810 | static void *tcg_cpu_thread_fn(void *arg) | |
811 | { | |
812 | CPUState *env = arg; | |
813 | ||
55f8d6ac | 814 | qemu_tcg_init_cpu_signals(); |
296af7c9 BS |
815 | qemu_thread_self(env->thread); |
816 | ||
817 | /* signal CPU creation */ | |
818 | qemu_mutex_lock(&qemu_global_mutex); | |
819 | for (env = first_cpu; env != NULL; env = env->next_cpu) | |
820 | env->created = 1; | |
821 | qemu_cond_signal(&qemu_cpu_cond); | |
822 | ||
823 | /* and wait for machine initialization */ | |
824 | while (!qemu_system_ready) | |
825 | qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100); | |
826 | ||
827 | while (1) { | |
472fb0c4 | 828 | cpu_exec_all(); |
6cabe1f3 | 829 | qemu_tcg_wait_io_event(); |
296af7c9 BS |
830 | } |
831 | ||
832 | return NULL; | |
833 | } | |
834 | ||
835 | void qemu_cpu_kick(void *_env) | |
836 | { | |
837 | CPUState *env = _env; | |
838 | qemu_cond_broadcast(env->halt_cond); | |
aa2c364b JK |
839 | if (!env->thread_kicked) { |
840 | qemu_thread_signal(env->thread, SIG_IPI); | |
841 | env->thread_kicked = true; | |
842 | } | |
296af7c9 BS |
843 | } |
844 | ||
46d62fac JK |
845 | void qemu_cpu_kick_self(void) |
846 | { | |
847 | assert(cpu_single_env); | |
848 | ||
849 | if (!cpu_single_env->thread_kicked) { | |
850 | qemu_thread_signal(cpu_single_env->thread, SIG_IPI); | |
851 | cpu_single_env->thread_kicked = true; | |
852 | } | |
853 | } | |
854 | ||
296af7c9 BS |
855 | int qemu_cpu_self(void *_env) |
856 | { | |
857 | CPUState *env = _env; | |
858 | QemuThread this; | |
859 | ||
860 | qemu_thread_self(&this); | |
861 | ||
862 | return qemu_thread_equal(&this, env->thread); | |
863 | } | |
864 | ||
296af7c9 BS |
865 | void qemu_mutex_lock_iothread(void) |
866 | { | |
867 | if (kvm_enabled()) { | |
296af7c9 | 868 | qemu_mutex_lock(&qemu_global_mutex); |
1a28cac3 MT |
869 | } else { |
870 | qemu_mutex_lock(&qemu_fair_mutex); | |
871 | if (qemu_mutex_trylock(&qemu_global_mutex)) { | |
872 | qemu_thread_signal(tcg_cpu_thread, SIG_IPI); | |
873 | qemu_mutex_lock(&qemu_global_mutex); | |
874 | } | |
875 | qemu_mutex_unlock(&qemu_fair_mutex); | |
876 | } | |
296af7c9 BS |
877 | } |
878 | ||
879 | void qemu_mutex_unlock_iothread(void) | |
880 | { | |
881 | qemu_mutex_unlock(&qemu_global_mutex); | |
882 | } | |
883 | ||
884 | static int all_vcpus_paused(void) | |
885 | { | |
886 | CPUState *penv = first_cpu; | |
887 | ||
888 | while (penv) { | |
889 | if (!penv->stopped) | |
890 | return 0; | |
891 | penv = (CPUState *)penv->next_cpu; | |
892 | } | |
893 | ||
894 | return 1; | |
895 | } | |
896 | ||
897 | void pause_all_vcpus(void) | |
898 | { | |
899 | CPUState *penv = first_cpu; | |
900 | ||
901 | while (penv) { | |
902 | penv->stop = 1; | |
296af7c9 BS |
903 | qemu_cpu_kick(penv); |
904 | penv = (CPUState *)penv->next_cpu; | |
905 | } | |
906 | ||
907 | while (!all_vcpus_paused()) { | |
908 | qemu_cond_timedwait(&qemu_pause_cond, &qemu_global_mutex, 100); | |
909 | penv = first_cpu; | |
910 | while (penv) { | |
1fbb22e5 | 911 | qemu_cpu_kick(penv); |
296af7c9 BS |
912 | penv = (CPUState *)penv->next_cpu; |
913 | } | |
914 | } | |
915 | } | |
916 | ||
917 | void resume_all_vcpus(void) | |
918 | { | |
919 | CPUState *penv = first_cpu; | |
920 | ||
921 | while (penv) { | |
922 | penv->stop = 0; | |
923 | penv->stopped = 0; | |
296af7c9 BS |
924 | qemu_cpu_kick(penv); |
925 | penv = (CPUState *)penv->next_cpu; | |
926 | } | |
927 | } | |
928 | ||
929 | static void tcg_init_vcpu(void *_env) | |
930 | { | |
931 | CPUState *env = _env; | |
932 | /* share a single thread for all cpus with TCG */ | |
933 | if (!tcg_cpu_thread) { | |
934 | env->thread = qemu_mallocz(sizeof(QemuThread)); | |
935 | env->halt_cond = qemu_mallocz(sizeof(QemuCond)); | |
936 | qemu_cond_init(env->halt_cond); | |
937 | qemu_thread_create(env->thread, tcg_cpu_thread_fn, env); | |
938 | while (env->created == 0) | |
939 | qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100); | |
940 | tcg_cpu_thread = env->thread; | |
941 | tcg_halt_cond = env->halt_cond; | |
942 | } else { | |
943 | env->thread = tcg_cpu_thread; | |
944 | env->halt_cond = tcg_halt_cond; | |
945 | } | |
946 | } | |
947 | ||
948 | static void kvm_start_vcpu(CPUState *env) | |
949 | { | |
950 | env->thread = qemu_mallocz(sizeof(QemuThread)); | |
951 | env->halt_cond = qemu_mallocz(sizeof(QemuCond)); | |
952 | qemu_cond_init(env->halt_cond); | |
953 | qemu_thread_create(env->thread, kvm_cpu_thread_fn, env); | |
954 | while (env->created == 0) | |
955 | qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100); | |
956 | } | |
957 | ||
958 | void qemu_init_vcpu(void *_env) | |
959 | { | |
960 | CPUState *env = _env; | |
961 | ||
962 | env->nr_cores = smp_cores; | |
963 | env->nr_threads = smp_threads; | |
964 | if (kvm_enabled()) | |
965 | kvm_start_vcpu(env); | |
966 | else | |
967 | tcg_init_vcpu(env); | |
968 | } | |
969 | ||
970 | void qemu_notify_event(void) | |
971 | { | |
972 | qemu_event_increment(); | |
973 | } | |
974 | ||
975 | static void qemu_system_vmstop_request(int reason) | |
976 | { | |
977 | vmstop_requested = reason; | |
978 | qemu_notify_event(); | |
979 | } | |
980 | ||
b4a3d965 JK |
981 | void cpu_stop_current(void) |
982 | { | |
983 | if (cpu_single_env) { | |
984 | cpu_single_env->stopped = 1; | |
985 | cpu_exit(cpu_single_env); | |
986 | } | |
987 | } | |
988 | ||
296af7c9 BS |
989 | void vm_stop(int reason) |
990 | { | |
991 | QemuThread me; | |
992 | qemu_thread_self(&me); | |
993 | ||
994 | if (!qemu_thread_equal(&me, &io_thread)) { | |
995 | qemu_system_vmstop_request(reason); | |
996 | /* | |
997 | * FIXME: should not return to device code in case | |
998 | * vm_stop() has been requested. | |
999 | */ | |
b4a3d965 | 1000 | cpu_stop_current(); |
296af7c9 BS |
1001 | return; |
1002 | } | |
1003 | do_vm_stop(reason); | |
1004 | } | |
1005 | ||
1006 | #endif | |
1007 | ||
1008 | static int qemu_cpu_exec(CPUState *env) | |
1009 | { | |
1010 | int ret; | |
1011 | #ifdef CONFIG_PROFILER | |
1012 | int64_t ti; | |
1013 | #endif | |
1014 | ||
1015 | #ifdef CONFIG_PROFILER | |
1016 | ti = profile_getclock(); | |
1017 | #endif | |
1018 | if (use_icount) { | |
1019 | int64_t count; | |
1020 | int decr; | |
1021 | qemu_icount -= (env->icount_decr.u16.low + env->icount_extra); | |
1022 | env->icount_decr.u16.low = 0; | |
1023 | env->icount_extra = 0; | |
1024 | count = qemu_icount_round (qemu_next_deadline()); | |
1025 | qemu_icount += count; | |
1026 | decr = (count > 0xffff) ? 0xffff : count; | |
1027 | count -= decr; | |
1028 | env->icount_decr.u16.low = decr; | |
1029 | env->icount_extra = count; | |
1030 | } | |
1031 | ret = cpu_exec(env); | |
1032 | #ifdef CONFIG_PROFILER | |
1033 | qemu_time += profile_getclock() - ti; | |
1034 | #endif | |
1035 | if (use_icount) { | |
1036 | /* Fold pending instructions back into the | |
1037 | instruction counter, and clear the interrupt flag. */ | |
1038 | qemu_icount -= (env->icount_decr.u16.low | |
1039 | + env->icount_extra); | |
1040 | env->icount_decr.u32 = 0; | |
1041 | env->icount_extra = 0; | |
1042 | } | |
1043 | return ret; | |
1044 | } | |
1045 | ||
472fb0c4 | 1046 | bool cpu_exec_all(void) |
296af7c9 | 1047 | { |
9a36085b JK |
1048 | int r; |
1049 | ||
296af7c9 BS |
1050 | if (next_cpu == NULL) |
1051 | next_cpu = first_cpu; | |
c629a4bc | 1052 | for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) { |
345f4426 | 1053 | CPUState *env = next_cpu; |
296af7c9 BS |
1054 | |
1055 | qemu_clock_enable(vm_clock, | |
345f4426 | 1056 | (env->singlestep_enabled & SSTEP_NOTIMER) == 0); |
296af7c9 BS |
1057 | |
1058 | if (qemu_alarm_pending()) | |
1059 | break; | |
3c638d06 | 1060 | if (cpu_can_run(env)) { |
9a36085b JK |
1061 | r = qemu_cpu_exec(env); |
1062 | if (kvm_enabled()) { | |
1063 | qemu_kvm_eat_signals(env); | |
1064 | } | |
1065 | if (r == EXCP_DEBUG) { | |
3c638d06 JK |
1066 | break; |
1067 | } | |
1068 | } else if (env->stop) { | |
296af7c9 BS |
1069 | break; |
1070 | } | |
1071 | } | |
c629a4bc | 1072 | exit_request = 0; |
472fb0c4 | 1073 | return any_cpu_has_work(); |
296af7c9 BS |
1074 | } |
1075 | ||
1076 | void set_numa_modes(void) | |
1077 | { | |
1078 | CPUState *env; | |
1079 | int i; | |
1080 | ||
1081 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
1082 | for (i = 0; i < nb_numa_nodes; i++) { | |
1083 | if (node_cpumask[i] & (1 << env->cpu_index)) { | |
1084 | env->numa_node = i; | |
1085 | } | |
1086 | } | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | void set_cpu_log(const char *optarg) | |
1091 | { | |
1092 | int mask; | |
1093 | const CPULogItem *item; | |
1094 | ||
1095 | mask = cpu_str_to_log_mask(optarg); | |
1096 | if (!mask) { | |
1097 | printf("Log items (comma separated):\n"); | |
1098 | for (item = cpu_log_items; item->mask != 0; item++) { | |
1099 | printf("%-10s %s\n", item->name, item->help); | |
1100 | } | |
1101 | exit(1); | |
1102 | } | |
1103 | cpu_set_log(mask); | |
1104 | } | |
29e922b6 BS |
1105 | |
1106 | /* Return the virtual CPU time, based on the instruction counter. */ | |
1107 | int64_t cpu_get_icount(void) | |
1108 | { | |
1109 | int64_t icount; | |
1110 | CPUState *env = cpu_single_env;; | |
1111 | ||
1112 | icount = qemu_icount; | |
1113 | if (env) { | |
1114 | if (!can_do_io(env)) { | |
1115 | fprintf(stderr, "Bad clock read\n"); | |
1116 | } | |
1117 | icount -= (env->icount_decr.u16.low + env->icount_extra); | |
1118 | } | |
1119 | return qemu_icount_bias + (icount << icount_time_shift); | |
1120 | } | |
262353cb | 1121 | |
9a78eead | 1122 | void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) |
262353cb BS |
1123 | { |
1124 | /* XXX: implement xxx_cpu_list for targets that still miss it */ | |
1125 | #if defined(cpu_list_id) | |
1126 | cpu_list_id(f, cpu_fprintf, optarg); | |
1127 | #elif defined(cpu_list) | |
1128 | cpu_list(f, cpu_fprintf); /* deprecated */ | |
1129 | #endif | |
1130 | } |