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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" | |
33 | #include "exec-all.h" | |
34 | ||
35 | #include "cpus.h" | |
36 | #include "compatfd.h" | |
37 | #ifdef CONFIG_LINUX | |
38 | #include <sys/prctl.h> | |
39 | #endif | |
40 | ||
41 | #ifdef SIGRTMIN | |
42 | #define SIG_IPI (SIGRTMIN+4) | |
43 | #else | |
44 | #define SIG_IPI SIGUSR1 | |
45 | #endif | |
46 | ||
47 | #ifndef PR_MCE_KILL | |
48 | #define PR_MCE_KILL 33 | |
49 | #endif | |
50 | ||
51 | static CPUState *next_cpu; | |
52 | ||
53 | /***********************************************************/ | |
54 | void hw_error(const char *fmt, ...) | |
55 | { | |
56 | va_list ap; | |
57 | CPUState *env; | |
58 | ||
59 | va_start(ap, fmt); | |
60 | fprintf(stderr, "qemu: hardware error: "); | |
61 | vfprintf(stderr, fmt, ap); | |
62 | fprintf(stderr, "\n"); | |
63 | for(env = first_cpu; env != NULL; env = env->next_cpu) { | |
64 | fprintf(stderr, "CPU #%d:\n", env->cpu_index); | |
65 | #ifdef TARGET_I386 | |
66 | cpu_dump_state(env, stderr, fprintf, X86_DUMP_FPU); | |
67 | #else | |
68 | cpu_dump_state(env, stderr, fprintf, 0); | |
69 | #endif | |
70 | } | |
71 | va_end(ap); | |
72 | abort(); | |
73 | } | |
74 | ||
75 | void cpu_synchronize_all_states(void) | |
76 | { | |
77 | CPUState *cpu; | |
78 | ||
79 | for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) { | |
80 | cpu_synchronize_state(cpu); | |
81 | } | |
82 | } | |
83 | ||
84 | void cpu_synchronize_all_post_reset(void) | |
85 | { | |
86 | CPUState *cpu; | |
87 | ||
88 | for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) { | |
89 | cpu_synchronize_post_reset(cpu); | |
90 | } | |
91 | } | |
92 | ||
93 | void cpu_synchronize_all_post_init(void) | |
94 | { | |
95 | CPUState *cpu; | |
96 | ||
97 | for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) { | |
98 | cpu_synchronize_post_init(cpu); | |
99 | } | |
100 | } | |
101 | ||
102 | int cpu_is_stopped(CPUState *env) | |
103 | { | |
104 | return !vm_running || env->stopped; | |
105 | } | |
106 | ||
107 | static void do_vm_stop(int reason) | |
108 | { | |
109 | if (vm_running) { | |
110 | cpu_disable_ticks(); | |
111 | vm_running = 0; | |
112 | pause_all_vcpus(); | |
113 | vm_state_notify(0, reason); | |
114 | qemu_aio_flush(); | |
115 | bdrv_flush_all(); | |
116 | monitor_protocol_event(QEVENT_STOP, NULL); | |
117 | } | |
118 | } | |
119 | ||
120 | static int cpu_can_run(CPUState *env) | |
121 | { | |
122 | if (env->stop) | |
123 | return 0; | |
124 | if (env->stopped || !vm_running) | |
125 | return 0; | |
126 | return 1; | |
127 | } | |
128 | ||
129 | static int cpu_has_work(CPUState *env) | |
130 | { | |
131 | if (env->stop) | |
132 | return 1; | |
133 | if (env->queued_work_first) | |
134 | return 1; | |
135 | if (env->stopped || !vm_running) | |
136 | return 0; | |
137 | if (!env->halted) | |
138 | return 1; | |
139 | if (qemu_cpu_has_work(env)) | |
140 | return 1; | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static int any_cpu_has_work(void) | |
145 | { | |
146 | CPUState *env; | |
147 | ||
148 | for (env = first_cpu; env != NULL; env = env->next_cpu) | |
149 | if (cpu_has_work(env)) | |
150 | return 1; | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static void cpu_debug_handler(CPUState *env) | |
155 | { | |
156 | gdb_set_stop_cpu(env); | |
157 | debug_requested = EXCP_DEBUG; | |
158 | vm_stop(EXCP_DEBUG); | |
159 | } | |
160 | ||
161 | #ifndef _WIN32 | |
162 | static int io_thread_fd = -1; | |
163 | ||
164 | static void qemu_event_increment(void) | |
165 | { | |
166 | /* Write 8 bytes to be compatible with eventfd. */ | |
167 | static const uint64_t val = 1; | |
168 | ssize_t ret; | |
169 | ||
170 | if (io_thread_fd == -1) | |
171 | return; | |
172 | ||
173 | do { | |
174 | ret = write(io_thread_fd, &val, sizeof(val)); | |
175 | } while (ret < 0 && errno == EINTR); | |
176 | ||
177 | /* EAGAIN is fine, a read must be pending. */ | |
178 | if (ret < 0 && errno != EAGAIN) { | |
179 | fprintf(stderr, "qemu_event_increment: write() filed: %s\n", | |
180 | strerror(errno)); | |
181 | exit (1); | |
182 | } | |
183 | } | |
184 | ||
185 | static void qemu_event_read(void *opaque) | |
186 | { | |
187 | int fd = (unsigned long)opaque; | |
188 | ssize_t len; | |
189 | char buffer[512]; | |
190 | ||
191 | /* Drain the notify pipe. For eventfd, only 8 bytes will be read. */ | |
192 | do { | |
193 | len = read(fd, buffer, sizeof(buffer)); | |
194 | } while ((len == -1 && errno == EINTR) || len == sizeof(buffer)); | |
195 | } | |
196 | ||
197 | static int qemu_event_init(void) | |
198 | { | |
199 | int err; | |
200 | int fds[2]; | |
201 | ||
202 | err = qemu_eventfd(fds); | |
203 | if (err == -1) | |
204 | return -errno; | |
205 | ||
206 | err = fcntl_setfl(fds[0], O_NONBLOCK); | |
207 | if (err < 0) | |
208 | goto fail; | |
209 | ||
210 | err = fcntl_setfl(fds[1], O_NONBLOCK); | |
211 | if (err < 0) | |
212 | goto fail; | |
213 | ||
214 | qemu_set_fd_handler2(fds[0], NULL, qemu_event_read, NULL, | |
215 | (void *)(unsigned long)fds[0]); | |
216 | ||
217 | io_thread_fd = fds[1]; | |
218 | return 0; | |
219 | ||
220 | fail: | |
221 | close(fds[0]); | |
222 | close(fds[1]); | |
223 | return err; | |
224 | } | |
225 | #else | |
226 | HANDLE qemu_event_handle; | |
227 | ||
228 | static void dummy_event_handler(void *opaque) | |
229 | { | |
230 | } | |
231 | ||
232 | static int qemu_event_init(void) | |
233 | { | |
234 | qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL); | |
235 | if (!qemu_event_handle) { | |
236 | fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError()); | |
237 | return -1; | |
238 | } | |
239 | qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL); | |
240 | return 0; | |
241 | } | |
242 | ||
243 | static void qemu_event_increment(void) | |
244 | { | |
245 | if (!SetEvent(qemu_event_handle)) { | |
246 | fprintf(stderr, "qemu_event_increment: SetEvent failed: %ld\n", | |
247 | GetLastError()); | |
248 | exit (1); | |
249 | } | |
250 | } | |
251 | #endif | |
252 | ||
253 | #ifndef CONFIG_IOTHREAD | |
254 | int qemu_init_main_loop(void) | |
255 | { | |
256 | cpu_set_debug_excp_handler(cpu_debug_handler); | |
257 | ||
258 | return qemu_event_init(); | |
259 | } | |
260 | ||
261 | void qemu_main_loop_start(void) | |
262 | { | |
263 | } | |
264 | ||
265 | void qemu_init_vcpu(void *_env) | |
266 | { | |
267 | CPUState *env = _env; | |
268 | ||
269 | env->nr_cores = smp_cores; | |
270 | env->nr_threads = smp_threads; | |
271 | if (kvm_enabled()) | |
272 | kvm_init_vcpu(env); | |
273 | return; | |
274 | } | |
275 | ||
276 | int qemu_cpu_self(void *env) | |
277 | { | |
278 | return 1; | |
279 | } | |
280 | ||
281 | void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) | |
282 | { | |
283 | func(data); | |
284 | } | |
285 | ||
286 | void resume_all_vcpus(void) | |
287 | { | |
288 | } | |
289 | ||
290 | void pause_all_vcpus(void) | |
291 | { | |
292 | } | |
293 | ||
294 | void qemu_cpu_kick(void *env) | |
295 | { | |
296 | return; | |
297 | } | |
298 | ||
299 | void qemu_notify_event(void) | |
300 | { | |
301 | CPUState *env = cpu_single_env; | |
302 | ||
303 | qemu_event_increment (); | |
304 | if (env) { | |
305 | cpu_exit(env); | |
306 | } | |
307 | if (next_cpu && env != next_cpu) { | |
308 | cpu_exit(next_cpu); | |
309 | } | |
310 | } | |
311 | ||
312 | void qemu_mutex_lock_iothread(void) {} | |
313 | void qemu_mutex_unlock_iothread(void) {} | |
314 | ||
315 | void vm_stop(int reason) | |
316 | { | |
317 | do_vm_stop(reason); | |
318 | } | |
319 | ||
320 | #else /* CONFIG_IOTHREAD */ | |
321 | ||
322 | #include "qemu-thread.h" | |
323 | ||
324 | QemuMutex qemu_global_mutex; | |
325 | static QemuMutex qemu_fair_mutex; | |
326 | ||
327 | static QemuThread io_thread; | |
328 | ||
329 | static QemuThread *tcg_cpu_thread; | |
330 | static QemuCond *tcg_halt_cond; | |
331 | ||
332 | static int qemu_system_ready; | |
333 | /* cpu creation */ | |
334 | static QemuCond qemu_cpu_cond; | |
335 | /* system init */ | |
336 | static QemuCond qemu_system_cond; | |
337 | static QemuCond qemu_pause_cond; | |
338 | static QemuCond qemu_work_cond; | |
339 | ||
340 | static void tcg_init_ipi(void); | |
341 | static void kvm_init_ipi(CPUState *env); | |
342 | static sigset_t block_io_signals(void); | |
343 | ||
344 | /* If we have signalfd, we mask out the signals we want to handle and then | |
345 | * use signalfd to listen for them. We rely on whatever the current signal | |
346 | * handler is to dispatch the signals when we receive them. | |
347 | */ | |
348 | static void sigfd_handler(void *opaque) | |
349 | { | |
350 | int fd = (unsigned long) opaque; | |
351 | struct qemu_signalfd_siginfo info; | |
352 | struct sigaction action; | |
353 | ssize_t len; | |
354 | ||
355 | while (1) { | |
356 | do { | |
357 | len = read(fd, &info, sizeof(info)); | |
358 | } while (len == -1 && errno == EINTR); | |
359 | ||
360 | if (len == -1 && errno == EAGAIN) { | |
361 | break; | |
362 | } | |
363 | ||
364 | if (len != sizeof(info)) { | |
365 | printf("read from sigfd returned %zd: %m\n", len); | |
366 | return; | |
367 | } | |
368 | ||
369 | sigaction(info.ssi_signo, NULL, &action); | |
370 | if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) { | |
371 | action.sa_sigaction(info.ssi_signo, | |
372 | (siginfo_t *)&info, NULL); | |
373 | } else if (action.sa_handler) { | |
374 | action.sa_handler(info.ssi_signo); | |
375 | } | |
376 | } | |
377 | } | |
378 | ||
379 | static int qemu_signalfd_init(sigset_t mask) | |
380 | { | |
381 | int sigfd; | |
382 | ||
383 | sigfd = qemu_signalfd(&mask); | |
384 | if (sigfd == -1) { | |
385 | fprintf(stderr, "failed to create signalfd\n"); | |
386 | return -errno; | |
387 | } | |
388 | ||
389 | fcntl_setfl(sigfd, O_NONBLOCK); | |
390 | ||
391 | qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, | |
392 | (void *)(unsigned long) sigfd); | |
393 | ||
394 | return 0; | |
395 | } | |
396 | ||
397 | int qemu_init_main_loop(void) | |
398 | { | |
399 | int ret; | |
400 | sigset_t blocked_signals; | |
401 | ||
402 | cpu_set_debug_excp_handler(cpu_debug_handler); | |
403 | ||
404 | blocked_signals = block_io_signals(); | |
405 | ||
406 | ret = qemu_signalfd_init(blocked_signals); | |
407 | if (ret) | |
408 | return ret; | |
409 | ||
410 | /* Note eventfd must be drained before signalfd handlers run */ | |
411 | ret = qemu_event_init(); | |
412 | if (ret) | |
413 | return ret; | |
414 | ||
415 | qemu_cond_init(&qemu_pause_cond); | |
416 | qemu_cond_init(&qemu_system_cond); | |
417 | qemu_mutex_init(&qemu_fair_mutex); | |
418 | qemu_mutex_init(&qemu_global_mutex); | |
419 | qemu_mutex_lock(&qemu_global_mutex); | |
420 | ||
421 | qemu_thread_self(&io_thread); | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
426 | void qemu_main_loop_start(void) | |
427 | { | |
428 | qemu_system_ready = 1; | |
429 | qemu_cond_broadcast(&qemu_system_cond); | |
430 | } | |
431 | ||
432 | void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) | |
433 | { | |
434 | struct qemu_work_item wi; | |
435 | ||
436 | if (qemu_cpu_self(env)) { | |
437 | func(data); | |
438 | return; | |
439 | } | |
440 | ||
441 | wi.func = func; | |
442 | wi.data = data; | |
443 | if (!env->queued_work_first) | |
444 | env->queued_work_first = &wi; | |
445 | else | |
446 | env->queued_work_last->next = &wi; | |
447 | env->queued_work_last = &wi; | |
448 | wi.next = NULL; | |
449 | wi.done = false; | |
450 | ||
451 | qemu_cpu_kick(env); | |
452 | while (!wi.done) { | |
453 | CPUState *self_env = cpu_single_env; | |
454 | ||
455 | qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex); | |
456 | cpu_single_env = self_env; | |
457 | } | |
458 | } | |
459 | ||
460 | static void flush_queued_work(CPUState *env) | |
461 | { | |
462 | struct qemu_work_item *wi; | |
463 | ||
464 | if (!env->queued_work_first) | |
465 | return; | |
466 | ||
467 | while ((wi = env->queued_work_first)) { | |
468 | env->queued_work_first = wi->next; | |
469 | wi->func(wi->data); | |
470 | wi->done = true; | |
471 | } | |
472 | env->queued_work_last = NULL; | |
473 | qemu_cond_broadcast(&qemu_work_cond); | |
474 | } | |
475 | ||
476 | static void qemu_wait_io_event_common(CPUState *env) | |
477 | { | |
478 | if (env->stop) { | |
479 | env->stop = 0; | |
480 | env->stopped = 1; | |
481 | qemu_cond_signal(&qemu_pause_cond); | |
482 | } | |
483 | flush_queued_work(env); | |
484 | env->thread_kicked = false; | |
485 | } | |
486 | ||
487 | static void qemu_tcg_wait_io_event(void) | |
488 | { | |
489 | CPUState *env; | |
490 | ||
491 | while (!any_cpu_has_work()) | |
492 | qemu_cond_timedwait(tcg_halt_cond, &qemu_global_mutex, 1000); | |
493 | ||
494 | qemu_mutex_unlock(&qemu_global_mutex); | |
495 | ||
496 | /* | |
497 | * Users of qemu_global_mutex can be starved, having no chance | |
498 | * to acquire it since this path will get to it first. | |
499 | * So use another lock to provide fairness. | |
500 | */ | |
501 | qemu_mutex_lock(&qemu_fair_mutex); | |
502 | qemu_mutex_unlock(&qemu_fair_mutex); | |
503 | ||
504 | qemu_mutex_lock(&qemu_global_mutex); | |
505 | ||
506 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
507 | qemu_wait_io_event_common(env); | |
508 | } | |
509 | } | |
510 | ||
511 | static void sigbus_reraise(void) | |
512 | { | |
513 | sigset_t set; | |
514 | struct sigaction action; | |
515 | ||
516 | memset(&action, 0, sizeof(action)); | |
517 | action.sa_handler = SIG_DFL; | |
518 | if (!sigaction(SIGBUS, &action, NULL)) { | |
519 | raise(SIGBUS); | |
520 | sigemptyset(&set); | |
521 | sigaddset(&set, SIGBUS); | |
522 | sigprocmask(SIG_UNBLOCK, &set, NULL); | |
523 | } | |
524 | perror("Failed to re-raise SIGBUS!\n"); | |
525 | abort(); | |
526 | } | |
527 | ||
528 | static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo, | |
529 | void *ctx) | |
530 | { | |
531 | #if defined(TARGET_I386) | |
532 | if (kvm_on_sigbus(siginfo->ssi_code, (void *)(intptr_t)siginfo->ssi_addr)) | |
533 | #endif | |
534 | sigbus_reraise(); | |
535 | } | |
536 | ||
537 | static void qemu_kvm_eat_signal(CPUState *env, int timeout) | |
538 | { | |
539 | struct timespec ts; | |
540 | int r, e; | |
541 | siginfo_t siginfo; | |
542 | sigset_t waitset; | |
543 | sigset_t chkset; | |
544 | ||
545 | ts.tv_sec = timeout / 1000; | |
546 | ts.tv_nsec = (timeout % 1000) * 1000000; | |
547 | ||
548 | sigemptyset(&waitset); | |
549 | sigaddset(&waitset, SIG_IPI); | |
550 | sigaddset(&waitset, SIGBUS); | |
551 | ||
552 | do { | |
553 | qemu_mutex_unlock(&qemu_global_mutex); | |
554 | ||
555 | r = sigtimedwait(&waitset, &siginfo, &ts); | |
556 | e = errno; | |
557 | ||
558 | qemu_mutex_lock(&qemu_global_mutex); | |
559 | ||
560 | if (r == -1 && !(e == EAGAIN || e == EINTR)) { | |
561 | fprintf(stderr, "sigtimedwait: %s\n", strerror(e)); | |
562 | exit(1); | |
563 | } | |
564 | ||
565 | switch (r) { | |
566 | case SIGBUS: | |
567 | #ifdef TARGET_I386 | |
568 | if (kvm_on_sigbus_vcpu(env, siginfo.si_code, siginfo.si_addr)) | |
569 | #endif | |
570 | sigbus_reraise(); | |
571 | break; | |
572 | default: | |
573 | break; | |
574 | } | |
575 | ||
576 | r = sigpending(&chkset); | |
577 | if (r == -1) { | |
578 | fprintf(stderr, "sigpending: %s\n", strerror(e)); | |
579 | exit(1); | |
580 | } | |
581 | } while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS)); | |
582 | } | |
583 | ||
584 | static void qemu_kvm_wait_io_event(CPUState *env) | |
585 | { | |
586 | while (!cpu_has_work(env)) | |
587 | qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000); | |
588 | ||
589 | qemu_kvm_eat_signal(env, 0); | |
590 | qemu_wait_io_event_common(env); | |
591 | } | |
592 | ||
593 | static int qemu_cpu_exec(CPUState *env); | |
594 | ||
595 | static void *kvm_cpu_thread_fn(void *arg) | |
596 | { | |
597 | CPUState *env = arg; | |
598 | ||
599 | qemu_mutex_lock(&qemu_global_mutex); | |
600 | qemu_thread_self(env->thread); | |
601 | if (kvm_enabled()) | |
602 | kvm_init_vcpu(env); | |
603 | ||
604 | kvm_init_ipi(env); | |
605 | ||
606 | /* signal CPU creation */ | |
607 | env->created = 1; | |
608 | qemu_cond_signal(&qemu_cpu_cond); | |
609 | ||
610 | /* and wait for machine initialization */ | |
611 | while (!qemu_system_ready) | |
612 | qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100); | |
613 | ||
614 | while (1) { | |
615 | if (cpu_can_run(env)) | |
616 | qemu_cpu_exec(env); | |
617 | qemu_kvm_wait_io_event(env); | |
618 | } | |
619 | ||
620 | return NULL; | |
621 | } | |
622 | ||
623 | static void *tcg_cpu_thread_fn(void *arg) | |
624 | { | |
625 | CPUState *env = arg; | |
626 | ||
627 | tcg_init_ipi(); | |
628 | qemu_thread_self(env->thread); | |
629 | ||
630 | /* signal CPU creation */ | |
631 | qemu_mutex_lock(&qemu_global_mutex); | |
632 | for (env = first_cpu; env != NULL; env = env->next_cpu) | |
633 | env->created = 1; | |
634 | qemu_cond_signal(&qemu_cpu_cond); | |
635 | ||
636 | /* and wait for machine initialization */ | |
637 | while (!qemu_system_ready) | |
638 | qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100); | |
639 | ||
640 | while (1) { | |
641 | cpu_exec_all(); | |
642 | qemu_tcg_wait_io_event(); | |
643 | } | |
644 | ||
645 | return NULL; | |
646 | } | |
647 | ||
648 | void qemu_cpu_kick(void *_env) | |
649 | { | |
650 | CPUState *env = _env; | |
651 | qemu_cond_broadcast(env->halt_cond); | |
652 | if (!env->thread_kicked) { | |
653 | qemu_thread_signal(env->thread, SIG_IPI); | |
654 | env->thread_kicked = true; | |
655 | } | |
656 | } | |
657 | ||
658 | int qemu_cpu_self(void *_env) | |
659 | { | |
660 | CPUState *env = _env; | |
661 | QemuThread this; | |
662 | ||
663 | qemu_thread_self(&this); | |
664 | ||
665 | return qemu_thread_equal(&this, env->thread); | |
666 | } | |
667 | ||
668 | static void cpu_signal(int sig) | |
669 | { | |
670 | if (cpu_single_env) | |
671 | cpu_exit(cpu_single_env); | |
672 | exit_request = 1; | |
673 | } | |
674 | ||
675 | static void tcg_init_ipi(void) | |
676 | { | |
677 | sigset_t set; | |
678 | struct sigaction sigact; | |
679 | ||
680 | memset(&sigact, 0, sizeof(sigact)); | |
681 | sigact.sa_handler = cpu_signal; | |
682 | sigaction(SIG_IPI, &sigact, NULL); | |
683 | ||
684 | sigemptyset(&set); | |
685 | sigaddset(&set, SIG_IPI); | |
686 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); | |
687 | } | |
688 | ||
689 | static void dummy_signal(int sig) | |
690 | { | |
691 | } | |
692 | ||
693 | static void kvm_init_ipi(CPUState *env) | |
694 | { | |
695 | int r; | |
696 | sigset_t set; | |
697 | struct sigaction sigact; | |
698 | ||
699 | memset(&sigact, 0, sizeof(sigact)); | |
700 | sigact.sa_handler = dummy_signal; | |
701 | sigaction(SIG_IPI, &sigact, NULL); | |
702 | ||
703 | pthread_sigmask(SIG_BLOCK, NULL, &set); | |
704 | sigdelset(&set, SIG_IPI); | |
705 | sigdelset(&set, SIGBUS); | |
706 | r = kvm_set_signal_mask(env, &set); | |
707 | if (r) { | |
708 | fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(r)); | |
709 | exit(1); | |
710 | } | |
711 | } | |
712 | ||
713 | static sigset_t block_io_signals(void) | |
714 | { | |
715 | sigset_t set; | |
716 | struct sigaction action; | |
717 | ||
718 | /* SIGUSR2 used by posix-aio-compat.c */ | |
719 | sigemptyset(&set); | |
720 | sigaddset(&set, SIGUSR2); | |
721 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); | |
722 | ||
723 | sigemptyset(&set); | |
724 | sigaddset(&set, SIGIO); | |
725 | sigaddset(&set, SIGALRM); | |
726 | sigaddset(&set, SIG_IPI); | |
727 | sigaddset(&set, SIGBUS); | |
728 | pthread_sigmask(SIG_BLOCK, &set, NULL); | |
729 | ||
730 | memset(&action, 0, sizeof(action)); | |
731 | action.sa_flags = SA_SIGINFO; | |
732 | action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler; | |
733 | sigaction(SIGBUS, &action, NULL); | |
734 | prctl(PR_MCE_KILL, 1, 1, 0, 0); | |
735 | ||
736 | return set; | |
737 | } | |
738 | ||
739 | void qemu_mutex_lock_iothread(void) | |
740 | { | |
741 | if (kvm_enabled()) { | |
742 | qemu_mutex_lock(&qemu_global_mutex); | |
743 | } else { | |
744 | qemu_mutex_lock(&qemu_fair_mutex); | |
745 | if (qemu_mutex_trylock(&qemu_global_mutex)) { | |
746 | qemu_thread_signal(tcg_cpu_thread, SIG_IPI); | |
747 | qemu_mutex_lock(&qemu_global_mutex); | |
748 | } | |
749 | qemu_mutex_unlock(&qemu_fair_mutex); | |
750 | } | |
751 | } | |
752 | ||
753 | void qemu_mutex_unlock_iothread(void) | |
754 | { | |
755 | qemu_mutex_unlock(&qemu_global_mutex); | |
756 | } | |
757 | ||
758 | static int all_vcpus_paused(void) | |
759 | { | |
760 | CPUState *penv = first_cpu; | |
761 | ||
762 | while (penv) { | |
763 | if (!penv->stopped) | |
764 | return 0; | |
765 | penv = (CPUState *)penv->next_cpu; | |
766 | } | |
767 | ||
768 | return 1; | |
769 | } | |
770 | ||
771 | void pause_all_vcpus(void) | |
772 | { | |
773 | CPUState *penv = first_cpu; | |
774 | ||
775 | while (penv) { | |
776 | penv->stop = 1; | |
777 | qemu_cpu_kick(penv); | |
778 | penv = (CPUState *)penv->next_cpu; | |
779 | } | |
780 | ||
781 | while (!all_vcpus_paused()) { | |
782 | qemu_cond_timedwait(&qemu_pause_cond, &qemu_global_mutex, 100); | |
783 | penv = first_cpu; | |
784 | while (penv) { | |
785 | qemu_cpu_kick(penv); | |
786 | penv = (CPUState *)penv->next_cpu; | |
787 | } | |
788 | } | |
789 | } | |
790 | ||
791 | void resume_all_vcpus(void) | |
792 | { | |
793 | CPUState *penv = first_cpu; | |
794 | ||
795 | while (penv) { | |
796 | penv->stop = 0; | |
797 | penv->stopped = 0; | |
798 | qemu_cpu_kick(penv); | |
799 | penv = (CPUState *)penv->next_cpu; | |
800 | } | |
801 | } | |
802 | ||
803 | static void tcg_init_vcpu(void *_env) | |
804 | { | |
805 | CPUState *env = _env; | |
806 | /* share a single thread for all cpus with TCG */ | |
807 | if (!tcg_cpu_thread) { | |
808 | env->thread = qemu_mallocz(sizeof(QemuThread)); | |
809 | env->halt_cond = qemu_mallocz(sizeof(QemuCond)); | |
810 | qemu_cond_init(env->halt_cond); | |
811 | qemu_thread_create(env->thread, tcg_cpu_thread_fn, env); | |
812 | while (env->created == 0) | |
813 | qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100); | |
814 | tcg_cpu_thread = env->thread; | |
815 | tcg_halt_cond = env->halt_cond; | |
816 | } else { | |
817 | env->thread = tcg_cpu_thread; | |
818 | env->halt_cond = tcg_halt_cond; | |
819 | } | |
820 | } | |
821 | ||
822 | static void kvm_start_vcpu(CPUState *env) | |
823 | { | |
824 | env->thread = qemu_mallocz(sizeof(QemuThread)); | |
825 | env->halt_cond = qemu_mallocz(sizeof(QemuCond)); | |
826 | qemu_cond_init(env->halt_cond); | |
827 | qemu_thread_create(env->thread, kvm_cpu_thread_fn, env); | |
828 | while (env->created == 0) | |
829 | qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100); | |
830 | } | |
831 | ||
832 | void qemu_init_vcpu(void *_env) | |
833 | { | |
834 | CPUState *env = _env; | |
835 | ||
836 | env->nr_cores = smp_cores; | |
837 | env->nr_threads = smp_threads; | |
838 | if (kvm_enabled()) | |
839 | kvm_start_vcpu(env); | |
840 | else | |
841 | tcg_init_vcpu(env); | |
842 | } | |
843 | ||
844 | void qemu_notify_event(void) | |
845 | { | |
846 | qemu_event_increment(); | |
847 | } | |
848 | ||
849 | static void qemu_system_vmstop_request(int reason) | |
850 | { | |
851 | vmstop_requested = reason; | |
852 | qemu_notify_event(); | |
853 | } | |
854 | ||
855 | void vm_stop(int reason) | |
856 | { | |
857 | QemuThread me; | |
858 | qemu_thread_self(&me); | |
859 | ||
860 | if (!qemu_thread_equal(&me, &io_thread)) { | |
861 | qemu_system_vmstop_request(reason); | |
862 | /* | |
863 | * FIXME: should not return to device code in case | |
864 | * vm_stop() has been requested. | |
865 | */ | |
866 | if (cpu_single_env) { | |
867 | cpu_exit(cpu_single_env); | |
868 | cpu_single_env->stop = 1; | |
869 | } | |
870 | return; | |
871 | } | |
872 | do_vm_stop(reason); | |
873 | } | |
874 | ||
875 | #endif | |
876 | ||
877 | static int qemu_cpu_exec(CPUState *env) | |
878 | { | |
879 | int ret; | |
880 | #ifdef CONFIG_PROFILER | |
881 | int64_t ti; | |
882 | #endif | |
883 | ||
884 | #ifdef CONFIG_PROFILER | |
885 | ti = profile_getclock(); | |
886 | #endif | |
887 | if (use_icount) { | |
888 | int64_t count; | |
889 | int decr; | |
890 | qemu_icount -= (env->icount_decr.u16.low + env->icount_extra); | |
891 | env->icount_decr.u16.low = 0; | |
892 | env->icount_extra = 0; | |
893 | count = qemu_icount_round (qemu_next_deadline()); | |
894 | qemu_icount += count; | |
895 | decr = (count > 0xffff) ? 0xffff : count; | |
896 | count -= decr; | |
897 | env->icount_decr.u16.low = decr; | |
898 | env->icount_extra = count; | |
899 | } | |
900 | ret = cpu_exec(env); | |
901 | #ifdef CONFIG_PROFILER | |
902 | qemu_time += profile_getclock() - ti; | |
903 | #endif | |
904 | if (use_icount) { | |
905 | /* Fold pending instructions back into the | |
906 | instruction counter, and clear the interrupt flag. */ | |
907 | qemu_icount -= (env->icount_decr.u16.low | |
908 | + env->icount_extra); | |
909 | env->icount_decr.u32 = 0; | |
910 | env->icount_extra = 0; | |
911 | } | |
912 | return ret; | |
913 | } | |
914 | ||
915 | bool cpu_exec_all(void) | |
916 | { | |
917 | if (next_cpu == NULL) | |
918 | next_cpu = first_cpu; | |
919 | for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) { | |
920 | CPUState *env = next_cpu; | |
921 | ||
922 | qemu_clock_enable(vm_clock, | |
923 | (env->singlestep_enabled & SSTEP_NOTIMER) == 0); | |
924 | ||
925 | if (qemu_alarm_pending()) | |
926 | break; | |
927 | if (cpu_can_run(env)) { | |
928 | if (qemu_cpu_exec(env) == EXCP_DEBUG) { | |
929 | break; | |
930 | } | |
931 | } else if (env->stop) { | |
932 | break; | |
933 | } | |
934 | } | |
935 | exit_request = 0; | |
936 | return any_cpu_has_work(); | |
937 | } | |
938 | ||
939 | void set_numa_modes(void) | |
940 | { | |
941 | CPUState *env; | |
942 | int i; | |
943 | ||
944 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
945 | for (i = 0; i < nb_numa_nodes; i++) { | |
946 | if (node_cpumask[i] & (1 << env->cpu_index)) { | |
947 | env->numa_node = i; | |
948 | } | |
949 | } | |
950 | } | |
951 | } | |
952 | ||
953 | void set_cpu_log(const char *optarg) | |
954 | { | |
955 | int mask; | |
956 | const CPULogItem *item; | |
957 | ||
958 | mask = cpu_str_to_log_mask(optarg); | |
959 | if (!mask) { | |
960 | printf("Log items (comma separated):\n"); | |
961 | for (item = cpu_log_items; item->mask != 0; item++) { | |
962 | printf("%-10s %s\n", item->name, item->help); | |
963 | } | |
964 | exit(1); | |
965 | } | |
966 | cpu_set_log(mask); | |
967 | } | |
968 | ||
969 | /* Return the virtual CPU time, based on the instruction counter. */ | |
970 | int64_t cpu_get_icount(void) | |
971 | { | |
972 | int64_t icount; | |
973 | CPUState *env = cpu_single_env;; | |
974 | ||
975 | icount = qemu_icount; | |
976 | if (env) { | |
977 | if (!can_do_io(env)) { | |
978 | fprintf(stderr, "Bad clock read\n"); | |
979 | } | |
980 | icount -= (env->icount_decr.u16.low + env->icount_extra); | |
981 | } | |
982 | return qemu_icount_bias + (icount << icount_time_shift); | |
983 | } | |
984 | ||
985 | void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) | |
986 | { | |
987 | /* XXX: implement xxx_cpu_list for targets that still miss it */ | |
988 | #if defined(cpu_list_id) | |
989 | cpu_list_id(f, cpu_fprintf, optarg); | |
990 | #elif defined(cpu_list) | |
991 | cpu_list(f, cpu_fprintf); /* deprecated */ | |
992 | #endif | |
993 | } |