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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 | ||
34 | #include "qemu-thread.h" | |
35 | #include "cpus.h" | |
36 | ||
37 | #ifndef _WIN32 | |
38 | #include "compatfd.h" | |
39 | #endif | |
40 | ||
41 | #ifdef SIGRTMIN | |
42 | #define SIG_IPI (SIGRTMIN+4) | |
43 | #else | |
44 | #define SIG_IPI SIGUSR1 | |
45 | #endif | |
46 | ||
47 | #ifdef CONFIG_LINUX | |
48 | ||
49 | #include <sys/prctl.h> | |
50 | ||
51 | #ifndef PR_MCE_KILL | |
52 | #define PR_MCE_KILL 33 | |
53 | #endif | |
54 | ||
55 | #ifndef PR_MCE_KILL_SET | |
56 | #define PR_MCE_KILL_SET 1 | |
57 | #endif | |
58 | ||
59 | #ifndef PR_MCE_KILL_EARLY | |
60 | #define PR_MCE_KILL_EARLY 1 | |
61 | #endif | |
62 | ||
63 | #endif /* CONFIG_LINUX */ | |
64 | ||
65 | static CPUState *next_cpu; | |
66 | ||
67 | /***********************************************************/ | |
68 | void hw_error(const char *fmt, ...) | |
69 | { | |
70 | va_list ap; | |
71 | CPUState *env; | |
72 | ||
73 | va_start(ap, fmt); | |
74 | fprintf(stderr, "qemu: hardware error: "); | |
75 | vfprintf(stderr, fmt, ap); | |
76 | fprintf(stderr, "\n"); | |
77 | for(env = first_cpu; env != NULL; env = env->next_cpu) { | |
78 | fprintf(stderr, "CPU #%d:\n", env->cpu_index); | |
79 | #ifdef TARGET_I386 | |
80 | cpu_dump_state(env, stderr, fprintf, X86_DUMP_FPU); | |
81 | #else | |
82 | cpu_dump_state(env, stderr, fprintf, 0); | |
83 | #endif | |
84 | } | |
85 | va_end(ap); | |
86 | abort(); | |
87 | } | |
88 | ||
89 | void cpu_synchronize_all_states(void) | |
90 | { | |
91 | CPUState *cpu; | |
92 | ||
93 | for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) { | |
94 | cpu_synchronize_state(cpu); | |
95 | } | |
96 | } | |
97 | ||
98 | void cpu_synchronize_all_post_reset(void) | |
99 | { | |
100 | CPUState *cpu; | |
101 | ||
102 | for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) { | |
103 | cpu_synchronize_post_reset(cpu); | |
104 | } | |
105 | } | |
106 | ||
107 | void cpu_synchronize_all_post_init(void) | |
108 | { | |
109 | CPUState *cpu; | |
110 | ||
111 | for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) { | |
112 | cpu_synchronize_post_init(cpu); | |
113 | } | |
114 | } | |
115 | ||
116 | int cpu_is_stopped(CPUState *env) | |
117 | { | |
118 | return !runstate_is_running() || env->stopped; | |
119 | } | |
120 | ||
121 | static void do_vm_stop(RunState state) | |
122 | { | |
123 | if (runstate_is_running()) { | |
124 | cpu_disable_ticks(); | |
125 | pause_all_vcpus(); | |
126 | runstate_set(state); | |
127 | vm_state_notify(0, state); | |
128 | qemu_aio_flush(); | |
129 | bdrv_flush_all(); | |
130 | monitor_protocol_event(QEVENT_STOP, NULL); | |
131 | } | |
132 | } | |
133 | ||
134 | static int cpu_can_run(CPUState *env) | |
135 | { | |
136 | if (env->stop) { | |
137 | return 0; | |
138 | } | |
139 | if (env->stopped || !runstate_is_running()) { | |
140 | return 0; | |
141 | } | |
142 | return 1; | |
143 | } | |
144 | ||
145 | static bool cpu_thread_is_idle(CPUState *env) | |
146 | { | |
147 | if (env->stop || env->queued_work_first) { | |
148 | return false; | |
149 | } | |
150 | if (env->stopped || !runstate_is_running()) { | |
151 | return true; | |
152 | } | |
153 | if (!env->halted || qemu_cpu_has_work(env) || | |
154 | (kvm_enabled() && kvm_irqchip_in_kernel())) { | |
155 | return false; | |
156 | } | |
157 | return true; | |
158 | } | |
159 | ||
160 | bool all_cpu_threads_idle(void) | |
161 | { | |
162 | CPUState *env; | |
163 | ||
164 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
165 | if (!cpu_thread_is_idle(env)) { | |
166 | return false; | |
167 | } | |
168 | } | |
169 | return true; | |
170 | } | |
171 | ||
172 | static void cpu_handle_guest_debug(CPUState *env) | |
173 | { | |
174 | gdb_set_stop_cpu(env); | |
175 | qemu_system_debug_request(); | |
176 | env->stopped = 1; | |
177 | } | |
178 | ||
179 | static void cpu_signal(int sig) | |
180 | { | |
181 | if (cpu_single_env) { | |
182 | cpu_exit(cpu_single_env); | |
183 | } | |
184 | exit_request = 1; | |
185 | } | |
186 | ||
187 | #ifdef CONFIG_LINUX | |
188 | static void sigbus_reraise(void) | |
189 | { | |
190 | sigset_t set; | |
191 | struct sigaction action; | |
192 | ||
193 | memset(&action, 0, sizeof(action)); | |
194 | action.sa_handler = SIG_DFL; | |
195 | if (!sigaction(SIGBUS, &action, NULL)) { | |
196 | raise(SIGBUS); | |
197 | sigemptyset(&set); | |
198 | sigaddset(&set, SIGBUS); | |
199 | sigprocmask(SIG_UNBLOCK, &set, NULL); | |
200 | } | |
201 | perror("Failed to re-raise SIGBUS!\n"); | |
202 | abort(); | |
203 | } | |
204 | ||
205 | static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo, | |
206 | void *ctx) | |
207 | { | |
208 | if (kvm_on_sigbus(siginfo->ssi_code, | |
209 | (void *)(intptr_t)siginfo->ssi_addr)) { | |
210 | sigbus_reraise(); | |
211 | } | |
212 | } | |
213 | ||
214 | static void qemu_init_sigbus(void) | |
215 | { | |
216 | struct sigaction action; | |
217 | ||
218 | memset(&action, 0, sizeof(action)); | |
219 | action.sa_flags = SA_SIGINFO; | |
220 | action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler; | |
221 | sigaction(SIGBUS, &action, NULL); | |
222 | ||
223 | prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0); | |
224 | } | |
225 | ||
226 | static void qemu_kvm_eat_signals(CPUState *env) | |
227 | { | |
228 | struct timespec ts = { 0, 0 }; | |
229 | siginfo_t siginfo; | |
230 | sigset_t waitset; | |
231 | sigset_t chkset; | |
232 | int r; | |
233 | ||
234 | sigemptyset(&waitset); | |
235 | sigaddset(&waitset, SIG_IPI); | |
236 | sigaddset(&waitset, SIGBUS); | |
237 | ||
238 | do { | |
239 | r = sigtimedwait(&waitset, &siginfo, &ts); | |
240 | if (r == -1 && !(errno == EAGAIN || errno == EINTR)) { | |
241 | perror("sigtimedwait"); | |
242 | exit(1); | |
243 | } | |
244 | ||
245 | switch (r) { | |
246 | case SIGBUS: | |
247 | if (kvm_on_sigbus_vcpu(env, siginfo.si_code, siginfo.si_addr)) { | |
248 | sigbus_reraise(); | |
249 | } | |
250 | break; | |
251 | default: | |
252 | break; | |
253 | } | |
254 | ||
255 | r = sigpending(&chkset); | |
256 | if (r == -1) { | |
257 | perror("sigpending"); | |
258 | exit(1); | |
259 | } | |
260 | } while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS)); | |
261 | } | |
262 | ||
263 | #else /* !CONFIG_LINUX */ | |
264 | ||
265 | static void qemu_init_sigbus(void) | |
266 | { | |
267 | } | |
268 | ||
269 | static void qemu_kvm_eat_signals(CPUState *env) | |
270 | { | |
271 | } | |
272 | #endif /* !CONFIG_LINUX */ | |
273 | ||
274 | #ifndef _WIN32 | |
275 | static int io_thread_fd = -1; | |
276 | ||
277 | static void qemu_event_increment(void) | |
278 | { | |
279 | /* Write 8 bytes to be compatible with eventfd. */ | |
280 | static const uint64_t val = 1; | |
281 | ssize_t ret; | |
282 | ||
283 | if (io_thread_fd == -1) { | |
284 | return; | |
285 | } | |
286 | do { | |
287 | ret = write(io_thread_fd, &val, sizeof(val)); | |
288 | } while (ret < 0 && errno == EINTR); | |
289 | ||
290 | /* EAGAIN is fine, a read must be pending. */ | |
291 | if (ret < 0 && errno != EAGAIN) { | |
292 | fprintf(stderr, "qemu_event_increment: write() failed: %s\n", | |
293 | strerror(errno)); | |
294 | exit (1); | |
295 | } | |
296 | } | |
297 | ||
298 | static void qemu_event_read(void *opaque) | |
299 | { | |
300 | int fd = (intptr_t)opaque; | |
301 | ssize_t len; | |
302 | char buffer[512]; | |
303 | ||
304 | /* Drain the notify pipe. For eventfd, only 8 bytes will be read. */ | |
305 | do { | |
306 | len = read(fd, buffer, sizeof(buffer)); | |
307 | } while ((len == -1 && errno == EINTR) || len == sizeof(buffer)); | |
308 | } | |
309 | ||
310 | static int qemu_event_init(void) | |
311 | { | |
312 | int err; | |
313 | int fds[2]; | |
314 | ||
315 | err = qemu_eventfd(fds); | |
316 | if (err == -1) { | |
317 | return -errno; | |
318 | } | |
319 | err = fcntl_setfl(fds[0], O_NONBLOCK); | |
320 | if (err < 0) { | |
321 | goto fail; | |
322 | } | |
323 | err = fcntl_setfl(fds[1], O_NONBLOCK); | |
324 | if (err < 0) { | |
325 | goto fail; | |
326 | } | |
327 | qemu_set_fd_handler2(fds[0], NULL, qemu_event_read, NULL, | |
328 | (void *)(intptr_t)fds[0]); | |
329 | ||
330 | io_thread_fd = fds[1]; | |
331 | return 0; | |
332 | ||
333 | fail: | |
334 | close(fds[0]); | |
335 | close(fds[1]); | |
336 | return err; | |
337 | } | |
338 | ||
339 | static void dummy_signal(int sig) | |
340 | { | |
341 | } | |
342 | ||
343 | /* If we have signalfd, we mask out the signals we want to handle and then | |
344 | * use signalfd to listen for them. We rely on whatever the current signal | |
345 | * handler is to dispatch the signals when we receive them. | |
346 | */ | |
347 | static void sigfd_handler(void *opaque) | |
348 | { | |
349 | int fd = (intptr_t)opaque; | |
350 | struct qemu_signalfd_siginfo info; | |
351 | struct sigaction action; | |
352 | ssize_t len; | |
353 | ||
354 | while (1) { | |
355 | do { | |
356 | len = read(fd, &info, sizeof(info)); | |
357 | } while (len == -1 && errno == EINTR); | |
358 | ||
359 | if (len == -1 && errno == EAGAIN) { | |
360 | break; | |
361 | } | |
362 | ||
363 | if (len != sizeof(info)) { | |
364 | printf("read from sigfd returned %zd: %m\n", len); | |
365 | return; | |
366 | } | |
367 | ||
368 | sigaction(info.ssi_signo, NULL, &action); | |
369 | if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) { | |
370 | action.sa_sigaction(info.ssi_signo, | |
371 | (siginfo_t *)&info, NULL); | |
372 | } else if (action.sa_handler) { | |
373 | action.sa_handler(info.ssi_signo); | |
374 | } | |
375 | } | |
376 | } | |
377 | ||
378 | static int qemu_signal_init(void) | |
379 | { | |
380 | int sigfd; | |
381 | sigset_t set; | |
382 | ||
383 | /* | |
384 | * SIG_IPI must be blocked in the main thread and must not be caught | |
385 | * by sigwait() in the signal thread. Otherwise, the cpu thread will | |
386 | * not catch it reliably. | |
387 | */ | |
388 | sigemptyset(&set); | |
389 | sigaddset(&set, SIG_IPI); | |
390 | pthread_sigmask(SIG_BLOCK, &set, NULL); | |
391 | ||
392 | sigemptyset(&set); | |
393 | sigaddset(&set, SIGIO); | |
394 | sigaddset(&set, SIGALRM); | |
395 | sigaddset(&set, SIGBUS); | |
396 | pthread_sigmask(SIG_BLOCK, &set, NULL); | |
397 | ||
398 | sigfd = qemu_signalfd(&set); | |
399 | if (sigfd == -1) { | |
400 | fprintf(stderr, "failed to create signalfd\n"); | |
401 | return -errno; | |
402 | } | |
403 | ||
404 | fcntl_setfl(sigfd, O_NONBLOCK); | |
405 | ||
406 | qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, | |
407 | (void *)(intptr_t)sigfd); | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | static void qemu_kvm_init_cpu_signals(CPUState *env) | |
413 | { | |
414 | int r; | |
415 | sigset_t set; | |
416 | struct sigaction sigact; | |
417 | ||
418 | memset(&sigact, 0, sizeof(sigact)); | |
419 | sigact.sa_handler = dummy_signal; | |
420 | sigaction(SIG_IPI, &sigact, NULL); | |
421 | ||
422 | pthread_sigmask(SIG_BLOCK, NULL, &set); | |
423 | sigdelset(&set, SIG_IPI); | |
424 | sigdelset(&set, SIGBUS); | |
425 | r = kvm_set_signal_mask(env, &set); | |
426 | if (r) { | |
427 | fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r)); | |
428 | exit(1); | |
429 | } | |
430 | ||
431 | sigdelset(&set, SIG_IPI); | |
432 | sigdelset(&set, SIGBUS); | |
433 | r = kvm_set_signal_mask(env, &set); | |
434 | if (r) { | |
435 | fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r)); | |
436 | exit(1); | |
437 | } | |
438 | } | |
439 | ||
440 | static void qemu_tcg_init_cpu_signals(void) | |
441 | { | |
442 | sigset_t set; | |
443 | struct sigaction sigact; | |
444 | ||
445 | memset(&sigact, 0, sizeof(sigact)); | |
446 | sigact.sa_handler = cpu_signal; | |
447 | sigaction(SIG_IPI, &sigact, NULL); | |
448 | ||
449 | sigemptyset(&set); | |
450 | sigaddset(&set, SIG_IPI); | |
451 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); | |
452 | } | |
453 | ||
454 | #else /* _WIN32 */ | |
455 | ||
456 | HANDLE qemu_event_handle; | |
457 | ||
458 | static void dummy_event_handler(void *opaque) | |
459 | { | |
460 | } | |
461 | ||
462 | static int qemu_event_init(void) | |
463 | { | |
464 | qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL); | |
465 | if (!qemu_event_handle) { | |
466 | fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError()); | |
467 | return -1; | |
468 | } | |
469 | qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL); | |
470 | return 0; | |
471 | } | |
472 | ||
473 | static void qemu_event_increment(void) | |
474 | { | |
475 | if (!SetEvent(qemu_event_handle)) { | |
476 | fprintf(stderr, "qemu_event_increment: SetEvent failed: %ld\n", | |
477 | GetLastError()); | |
478 | exit (1); | |
479 | } | |
480 | } | |
481 | ||
482 | static int qemu_signal_init(void) | |
483 | { | |
484 | return 0; | |
485 | } | |
486 | ||
487 | static void qemu_kvm_init_cpu_signals(CPUState *env) | |
488 | { | |
489 | abort(); | |
490 | } | |
491 | ||
492 | static void qemu_tcg_init_cpu_signals(void) | |
493 | { | |
494 | } | |
495 | #endif /* _WIN32 */ | |
496 | ||
497 | QemuMutex qemu_global_mutex; | |
498 | static QemuCond qemu_io_proceeded_cond; | |
499 | static bool iothread_requesting_mutex; | |
500 | ||
501 | static QemuThread io_thread; | |
502 | ||
503 | static QemuThread *tcg_cpu_thread; | |
504 | static QemuCond *tcg_halt_cond; | |
505 | ||
506 | /* cpu creation */ | |
507 | static QemuCond qemu_cpu_cond; | |
508 | /* system init */ | |
509 | static QemuCond qemu_pause_cond; | |
510 | static QemuCond qemu_work_cond; | |
511 | ||
512 | int qemu_init_main_loop(void) | |
513 | { | |
514 | int ret; | |
515 | ||
516 | qemu_init_sigbus(); | |
517 | ||
518 | ret = qemu_signal_init(); | |
519 | if (ret) { | |
520 | return ret; | |
521 | } | |
522 | ||
523 | /* Note eventfd must be drained before signalfd handlers run */ | |
524 | ret = qemu_event_init(); | |
525 | if (ret) { | |
526 | return ret; | |
527 | } | |
528 | ||
529 | qemu_cond_init(&qemu_cpu_cond); | |
530 | qemu_cond_init(&qemu_pause_cond); | |
531 | qemu_cond_init(&qemu_work_cond); | |
532 | qemu_cond_init(&qemu_io_proceeded_cond); | |
533 | qemu_mutex_init(&qemu_global_mutex); | |
534 | qemu_mutex_lock(&qemu_global_mutex); | |
535 | ||
536 | qemu_thread_get_self(&io_thread); | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
541 | void qemu_main_loop_start(void) | |
542 | { | |
543 | resume_all_vcpus(); | |
544 | } | |
545 | ||
546 | void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) | |
547 | { | |
548 | struct qemu_work_item wi; | |
549 | ||
550 | if (qemu_cpu_is_self(env)) { | |
551 | func(data); | |
552 | return; | |
553 | } | |
554 | ||
555 | wi.func = func; | |
556 | wi.data = data; | |
557 | if (!env->queued_work_first) { | |
558 | env->queued_work_first = &wi; | |
559 | } else { | |
560 | env->queued_work_last->next = &wi; | |
561 | } | |
562 | env->queued_work_last = &wi; | |
563 | wi.next = NULL; | |
564 | wi.done = false; | |
565 | ||
566 | qemu_cpu_kick(env); | |
567 | while (!wi.done) { | |
568 | CPUState *self_env = cpu_single_env; | |
569 | ||
570 | qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex); | |
571 | cpu_single_env = self_env; | |
572 | } | |
573 | } | |
574 | ||
575 | static void flush_queued_work(CPUState *env) | |
576 | { | |
577 | struct qemu_work_item *wi; | |
578 | ||
579 | if (!env->queued_work_first) { | |
580 | return; | |
581 | } | |
582 | ||
583 | while ((wi = env->queued_work_first)) { | |
584 | env->queued_work_first = wi->next; | |
585 | wi->func(wi->data); | |
586 | wi->done = true; | |
587 | } | |
588 | env->queued_work_last = NULL; | |
589 | qemu_cond_broadcast(&qemu_work_cond); | |
590 | } | |
591 | ||
592 | static void qemu_wait_io_event_common(CPUState *env) | |
593 | { | |
594 | if (env->stop) { | |
595 | env->stop = 0; | |
596 | env->stopped = 1; | |
597 | qemu_cond_signal(&qemu_pause_cond); | |
598 | } | |
599 | flush_queued_work(env); | |
600 | env->thread_kicked = false; | |
601 | } | |
602 | ||
603 | static void qemu_tcg_wait_io_event(void) | |
604 | { | |
605 | CPUState *env; | |
606 | ||
607 | while (all_cpu_threads_idle()) { | |
608 | /* Start accounting real time to the virtual clock if the CPUs | |
609 | are idle. */ | |
610 | qemu_clock_warp(vm_clock); | |
611 | qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex); | |
612 | } | |
613 | ||
614 | while (iothread_requesting_mutex) { | |
615 | qemu_cond_wait(&qemu_io_proceeded_cond, &qemu_global_mutex); | |
616 | } | |
617 | ||
618 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
619 | qemu_wait_io_event_common(env); | |
620 | } | |
621 | } | |
622 | ||
623 | static void qemu_kvm_wait_io_event(CPUState *env) | |
624 | { | |
625 | while (cpu_thread_is_idle(env)) { | |
626 | qemu_cond_wait(env->halt_cond, &qemu_global_mutex); | |
627 | } | |
628 | ||
629 | qemu_kvm_eat_signals(env); | |
630 | qemu_wait_io_event_common(env); | |
631 | } | |
632 | ||
633 | static void *qemu_kvm_cpu_thread_fn(void *arg) | |
634 | { | |
635 | CPUState *env = arg; | |
636 | int r; | |
637 | ||
638 | qemu_mutex_lock(&qemu_global_mutex); | |
639 | qemu_thread_get_self(env->thread); | |
640 | env->thread_id = qemu_get_thread_id(); | |
641 | ||
642 | r = kvm_init_vcpu(env); | |
643 | if (r < 0) { | |
644 | fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r)); | |
645 | exit(1); | |
646 | } | |
647 | ||
648 | qemu_kvm_init_cpu_signals(env); | |
649 | ||
650 | /* signal CPU creation */ | |
651 | env->created = 1; | |
652 | qemu_cond_signal(&qemu_cpu_cond); | |
653 | ||
654 | while (1) { | |
655 | if (cpu_can_run(env)) { | |
656 | r = kvm_cpu_exec(env); | |
657 | if (r == EXCP_DEBUG) { | |
658 | cpu_handle_guest_debug(env); | |
659 | } | |
660 | } | |
661 | qemu_kvm_wait_io_event(env); | |
662 | } | |
663 | ||
664 | return NULL; | |
665 | } | |
666 | ||
667 | static void *qemu_tcg_cpu_thread_fn(void *arg) | |
668 | { | |
669 | CPUState *env = arg; | |
670 | ||
671 | qemu_tcg_init_cpu_signals(); | |
672 | qemu_thread_get_self(env->thread); | |
673 | ||
674 | /* signal CPU creation */ | |
675 | qemu_mutex_lock(&qemu_global_mutex); | |
676 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
677 | env->thread_id = qemu_get_thread_id(); | |
678 | env->created = 1; | |
679 | } | |
680 | qemu_cond_signal(&qemu_cpu_cond); | |
681 | ||
682 | /* wait for initial kick-off after machine start */ | |
683 | while (first_cpu->stopped) { | |
684 | qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex); | |
685 | } | |
686 | ||
687 | while (1) { | |
688 | cpu_exec_all(); | |
689 | if (use_icount && qemu_next_icount_deadline() <= 0) { | |
690 | qemu_notify_event(); | |
691 | } | |
692 | qemu_tcg_wait_io_event(); | |
693 | } | |
694 | ||
695 | return NULL; | |
696 | } | |
697 | ||
698 | static void qemu_cpu_kick_thread(CPUState *env) | |
699 | { | |
700 | #ifndef _WIN32 | |
701 | int err; | |
702 | ||
703 | err = pthread_kill(env->thread->thread, SIG_IPI); | |
704 | if (err) { | |
705 | fprintf(stderr, "qemu:%s: %s", __func__, strerror(err)); | |
706 | exit(1); | |
707 | } | |
708 | #else /* _WIN32 */ | |
709 | if (!qemu_cpu_is_self(env)) { | |
710 | SuspendThread(env->thread->thread); | |
711 | cpu_signal(0); | |
712 | ResumeThread(env->thread->thread); | |
713 | } | |
714 | #endif | |
715 | } | |
716 | ||
717 | void qemu_cpu_kick(void *_env) | |
718 | { | |
719 | CPUState *env = _env; | |
720 | ||
721 | qemu_cond_broadcast(env->halt_cond); | |
722 | if (kvm_enabled() && !env->thread_kicked) { | |
723 | qemu_cpu_kick_thread(env); | |
724 | env->thread_kicked = true; | |
725 | } | |
726 | } | |
727 | ||
728 | void qemu_cpu_kick_self(void) | |
729 | { | |
730 | #ifndef _WIN32 | |
731 | assert(cpu_single_env); | |
732 | ||
733 | if (!cpu_single_env->thread_kicked) { | |
734 | qemu_cpu_kick_thread(cpu_single_env); | |
735 | cpu_single_env->thread_kicked = true; | |
736 | } | |
737 | #else | |
738 | abort(); | |
739 | #endif | |
740 | } | |
741 | ||
742 | int qemu_cpu_is_self(void *_env) | |
743 | { | |
744 | CPUState *env = _env; | |
745 | ||
746 | return qemu_thread_is_self(env->thread); | |
747 | } | |
748 | ||
749 | void qemu_mutex_lock_iothread(void) | |
750 | { | |
751 | if (kvm_enabled()) { | |
752 | qemu_mutex_lock(&qemu_global_mutex); | |
753 | } else { | |
754 | iothread_requesting_mutex = true; | |
755 | if (qemu_mutex_trylock(&qemu_global_mutex)) { | |
756 | qemu_cpu_kick_thread(first_cpu); | |
757 | qemu_mutex_lock(&qemu_global_mutex); | |
758 | } | |
759 | iothread_requesting_mutex = false; | |
760 | qemu_cond_broadcast(&qemu_io_proceeded_cond); | |
761 | } | |
762 | } | |
763 | ||
764 | void qemu_mutex_unlock_iothread(void) | |
765 | { | |
766 | qemu_mutex_unlock(&qemu_global_mutex); | |
767 | } | |
768 | ||
769 | static int all_vcpus_paused(void) | |
770 | { | |
771 | CPUState *penv = first_cpu; | |
772 | ||
773 | while (penv) { | |
774 | if (!penv->stopped) { | |
775 | return 0; | |
776 | } | |
777 | penv = (CPUState *)penv->next_cpu; | |
778 | } | |
779 | ||
780 | return 1; | |
781 | } | |
782 | ||
783 | void pause_all_vcpus(void) | |
784 | { | |
785 | CPUState *penv = first_cpu; | |
786 | ||
787 | while (penv) { | |
788 | penv->stop = 1; | |
789 | qemu_cpu_kick(penv); | |
790 | penv = (CPUState *)penv->next_cpu; | |
791 | } | |
792 | ||
793 | while (!all_vcpus_paused()) { | |
794 | qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex); | |
795 | penv = first_cpu; | |
796 | while (penv) { | |
797 | qemu_cpu_kick(penv); | |
798 | penv = (CPUState *)penv->next_cpu; | |
799 | } | |
800 | } | |
801 | } | |
802 | ||
803 | void resume_all_vcpus(void) | |
804 | { | |
805 | CPUState *penv = first_cpu; | |
806 | ||
807 | while (penv) { | |
808 | penv->stop = 0; | |
809 | penv->stopped = 0; | |
810 | qemu_cpu_kick(penv); | |
811 | penv = (CPUState *)penv->next_cpu; | |
812 | } | |
813 | } | |
814 | ||
815 | static void qemu_tcg_init_vcpu(void *_env) | |
816 | { | |
817 | CPUState *env = _env; | |
818 | ||
819 | /* share a single thread for all cpus with TCG */ | |
820 | if (!tcg_cpu_thread) { | |
821 | env->thread = g_malloc0(sizeof(QemuThread)); | |
822 | env->halt_cond = g_malloc0(sizeof(QemuCond)); | |
823 | qemu_cond_init(env->halt_cond); | |
824 | tcg_halt_cond = env->halt_cond; | |
825 | qemu_thread_create(env->thread, qemu_tcg_cpu_thread_fn, env); | |
826 | while (env->created == 0) { | |
827 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
828 | } | |
829 | tcg_cpu_thread = env->thread; | |
830 | } else { | |
831 | env->thread = tcg_cpu_thread; | |
832 | env->halt_cond = tcg_halt_cond; | |
833 | } | |
834 | } | |
835 | ||
836 | static void qemu_kvm_start_vcpu(CPUState *env) | |
837 | { | |
838 | env->thread = g_malloc0(sizeof(QemuThread)); | |
839 | env->halt_cond = g_malloc0(sizeof(QemuCond)); | |
840 | qemu_cond_init(env->halt_cond); | |
841 | qemu_thread_create(env->thread, qemu_kvm_cpu_thread_fn, env); | |
842 | while (env->created == 0) { | |
843 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
844 | } | |
845 | } | |
846 | ||
847 | void qemu_init_vcpu(void *_env) | |
848 | { | |
849 | CPUState *env = _env; | |
850 | ||
851 | env->nr_cores = smp_cores; | |
852 | env->nr_threads = smp_threads; | |
853 | env->stopped = 1; | |
854 | if (kvm_enabled()) { | |
855 | qemu_kvm_start_vcpu(env); | |
856 | } else { | |
857 | qemu_tcg_init_vcpu(env); | |
858 | } | |
859 | } | |
860 | ||
861 | void qemu_notify_event(void) | |
862 | { | |
863 | qemu_event_increment(); | |
864 | } | |
865 | ||
866 | void cpu_stop_current(void) | |
867 | { | |
868 | if (cpu_single_env) { | |
869 | cpu_single_env->stop = 0; | |
870 | cpu_single_env->stopped = 1; | |
871 | cpu_exit(cpu_single_env); | |
872 | qemu_cond_signal(&qemu_pause_cond); | |
873 | } | |
874 | } | |
875 | ||
876 | void vm_stop(RunState state) | |
877 | { | |
878 | if (!qemu_thread_is_self(&io_thread)) { | |
879 | qemu_system_vmstop_request(state); | |
880 | /* | |
881 | * FIXME: should not return to device code in case | |
882 | * vm_stop() has been requested. | |
883 | */ | |
884 | cpu_stop_current(); | |
885 | return; | |
886 | } | |
887 | do_vm_stop(state); | |
888 | } | |
889 | ||
890 | static int tcg_cpu_exec(CPUState *env) | |
891 | { | |
892 | int ret; | |
893 | #ifdef CONFIG_PROFILER | |
894 | int64_t ti; | |
895 | #endif | |
896 | ||
897 | #ifdef CONFIG_PROFILER | |
898 | ti = profile_getclock(); | |
899 | #endif | |
900 | if (use_icount) { | |
901 | int64_t count; | |
902 | int decr; | |
903 | qemu_icount -= (env->icount_decr.u16.low + env->icount_extra); | |
904 | env->icount_decr.u16.low = 0; | |
905 | env->icount_extra = 0; | |
906 | count = qemu_icount_round(qemu_next_icount_deadline()); | |
907 | qemu_icount += count; | |
908 | decr = (count > 0xffff) ? 0xffff : count; | |
909 | count -= decr; | |
910 | env->icount_decr.u16.low = decr; | |
911 | env->icount_extra = count; | |
912 | } | |
913 | ret = cpu_exec(env); | |
914 | #ifdef CONFIG_PROFILER | |
915 | qemu_time += profile_getclock() - ti; | |
916 | #endif | |
917 | if (use_icount) { | |
918 | /* Fold pending instructions back into the | |
919 | instruction counter, and clear the interrupt flag. */ | |
920 | qemu_icount -= (env->icount_decr.u16.low | |
921 | + env->icount_extra); | |
922 | env->icount_decr.u32 = 0; | |
923 | env->icount_extra = 0; | |
924 | } | |
925 | return ret; | |
926 | } | |
927 | ||
928 | bool cpu_exec_all(void) | |
929 | { | |
930 | int r; | |
931 | ||
932 | /* Account partial waits to the vm_clock. */ | |
933 | qemu_clock_warp(vm_clock); | |
934 | ||
935 | if (next_cpu == NULL) { | |
936 | next_cpu = first_cpu; | |
937 | } | |
938 | for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) { | |
939 | CPUState *env = next_cpu; | |
940 | ||
941 | qemu_clock_enable(vm_clock, | |
942 | (env->singlestep_enabled & SSTEP_NOTIMER) == 0); | |
943 | ||
944 | if (cpu_can_run(env)) { | |
945 | if (kvm_enabled()) { | |
946 | r = kvm_cpu_exec(env); | |
947 | qemu_kvm_eat_signals(env); | |
948 | } else { | |
949 | r = tcg_cpu_exec(env); | |
950 | } | |
951 | if (r == EXCP_DEBUG) { | |
952 | cpu_handle_guest_debug(env); | |
953 | break; | |
954 | } | |
955 | } else if (env->stop || env->stopped) { | |
956 | break; | |
957 | } | |
958 | } | |
959 | exit_request = 0; | |
960 | return !all_cpu_threads_idle(); | |
961 | } | |
962 | ||
963 | void set_numa_modes(void) | |
964 | { | |
965 | CPUState *env; | |
966 | int i; | |
967 | ||
968 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
969 | for (i = 0; i < nb_numa_nodes; i++) { | |
970 | if (node_cpumask[i] & (1 << env->cpu_index)) { | |
971 | env->numa_node = i; | |
972 | } | |
973 | } | |
974 | } | |
975 | } | |
976 | ||
977 | void set_cpu_log(const char *optarg) | |
978 | { | |
979 | int mask; | |
980 | const CPULogItem *item; | |
981 | ||
982 | mask = cpu_str_to_log_mask(optarg); | |
983 | if (!mask) { | |
984 | printf("Log items (comma separated):\n"); | |
985 | for (item = cpu_log_items; item->mask != 0; item++) { | |
986 | printf("%-10s %s\n", item->name, item->help); | |
987 | } | |
988 | exit(1); | |
989 | } | |
990 | cpu_set_log(mask); | |
991 | } | |
992 | ||
993 | void set_cpu_log_filename(const char *optarg) | |
994 | { | |
995 | cpu_set_log_filename(optarg); | |
996 | } | |
997 | ||
998 | /* Return the virtual CPU time, based on the instruction counter. */ | |
999 | int64_t cpu_get_icount(void) | |
1000 | { | |
1001 | int64_t icount; | |
1002 | CPUState *env = cpu_single_env;; | |
1003 | ||
1004 | icount = qemu_icount; | |
1005 | if (env) { | |
1006 | if (!can_do_io(env)) { | |
1007 | fprintf(stderr, "Bad clock read\n"); | |
1008 | } | |
1009 | icount -= (env->icount_decr.u16.low + env->icount_extra); | |
1010 | } | |
1011 | return qemu_icount_bias + (icount << icount_time_shift); | |
1012 | } | |
1013 | ||
1014 | void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) | |
1015 | { | |
1016 | /* XXX: implement xxx_cpu_list for targets that still miss it */ | |
1017 | #if defined(cpu_list_id) | |
1018 | cpu_list_id(f, cpu_fprintf, optarg); | |
1019 | #elif defined(cpu_list) | |
1020 | cpu_list(f, cpu_fprintf); /* deprecated */ | |
1021 | #endif | |
1022 | } |