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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 "qemu-thread.h" | |
36 | #include "cpus.h" | |
37 | #include "compatfd.h" | |
38 | ||
39 | #ifdef SIGRTMIN | |
40 | #define SIG_IPI (SIGRTMIN+4) | |
41 | #else | |
42 | #define SIG_IPI SIGUSR1 | |
43 | #endif | |
44 | ||
45 | #ifdef CONFIG_LINUX | |
46 | ||
47 | #include <sys/prctl.h> | |
48 | ||
49 | #ifndef PR_MCE_KILL | |
50 | #define PR_MCE_KILL 33 | |
51 | #endif | |
52 | ||
53 | #ifndef PR_MCE_KILL_SET | |
54 | #define PR_MCE_KILL_SET 1 | |
55 | #endif | |
56 | ||
57 | #ifndef PR_MCE_KILL_EARLY | |
58 | #define PR_MCE_KILL_EARLY 1 | |
59 | #endif | |
60 | ||
61 | #endif /* CONFIG_LINUX */ | |
62 | ||
63 | static CPUState *next_cpu; | |
64 | ||
65 | /***********************************************************/ | |
66 | void hw_error(const char *fmt, ...) | |
67 | { | |
68 | va_list ap; | |
69 | CPUState *env; | |
70 | ||
71 | va_start(ap, fmt); | |
72 | fprintf(stderr, "qemu: hardware error: "); | |
73 | vfprintf(stderr, fmt, ap); | |
74 | fprintf(stderr, "\n"); | |
75 | for(env = first_cpu; env != NULL; env = env->next_cpu) { | |
76 | fprintf(stderr, "CPU #%d:\n", env->cpu_index); | |
77 | #ifdef TARGET_I386 | |
78 | cpu_dump_state(env, stderr, fprintf, X86_DUMP_FPU); | |
79 | #else | |
80 | cpu_dump_state(env, stderr, fprintf, 0); | |
81 | #endif | |
82 | } | |
83 | va_end(ap); | |
84 | abort(); | |
85 | } | |
86 | ||
87 | void cpu_synchronize_all_states(void) | |
88 | { | |
89 | CPUState *cpu; | |
90 | ||
91 | for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) { | |
92 | cpu_synchronize_state(cpu); | |
93 | } | |
94 | } | |
95 | ||
96 | void cpu_synchronize_all_post_reset(void) | |
97 | { | |
98 | CPUState *cpu; | |
99 | ||
100 | for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) { | |
101 | cpu_synchronize_post_reset(cpu); | |
102 | } | |
103 | } | |
104 | ||
105 | void cpu_synchronize_all_post_init(void) | |
106 | { | |
107 | CPUState *cpu; | |
108 | ||
109 | for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) { | |
110 | cpu_synchronize_post_init(cpu); | |
111 | } | |
112 | } | |
113 | ||
114 | int cpu_is_stopped(CPUState *env) | |
115 | { | |
116 | return !vm_running || env->stopped; | |
117 | } | |
118 | ||
119 | static void do_vm_stop(int reason) | |
120 | { | |
121 | if (vm_running) { | |
122 | cpu_disable_ticks(); | |
123 | vm_running = 0; | |
124 | pause_all_vcpus(); | |
125 | vm_state_notify(0, reason); | |
126 | qemu_aio_flush(); | |
127 | bdrv_flush_all(); | |
128 | monitor_protocol_event(QEVENT_STOP, NULL); | |
129 | } | |
130 | } | |
131 | ||
132 | static int cpu_can_run(CPUState *env) | |
133 | { | |
134 | if (env->stop) { | |
135 | return 0; | |
136 | } | |
137 | if (env->stopped || !vm_running) { | |
138 | return 0; | |
139 | } | |
140 | return 1; | |
141 | } | |
142 | ||
143 | static bool cpu_thread_is_idle(CPUState *env) | |
144 | { | |
145 | if (env->stop || env->queued_work_first) { | |
146 | return false; | |
147 | } | |
148 | if (env->stopped || !vm_running) { | |
149 | return true; | |
150 | } | |
151 | if (!env->halted || qemu_cpu_has_work(env) || | |
152 | (kvm_enabled() && kvm_irqchip_in_kernel())) { | |
153 | return false; | |
154 | } | |
155 | return true; | |
156 | } | |
157 | ||
158 | static bool all_cpu_threads_idle(void) | |
159 | { | |
160 | CPUState *env; | |
161 | ||
162 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
163 | if (!cpu_thread_is_idle(env)) { | |
164 | return false; | |
165 | } | |
166 | } | |
167 | return true; | |
168 | } | |
169 | ||
170 | static void cpu_handle_guest_debug(CPUState *env) | |
171 | { | |
172 | gdb_set_stop_cpu(env); | |
173 | qemu_system_debug_request(); | |
174 | #ifdef CONFIG_IOTHREAD | |
175 | env->stopped = 1; | |
176 | #endif | |
177 | } | |
178 | ||
179 | #ifdef CONFIG_IOTHREAD | |
180 | static void cpu_signal(int sig) | |
181 | { | |
182 | if (cpu_single_env) { | |
183 | cpu_exit(cpu_single_env); | |
184 | } | |
185 | exit_request = 1; | |
186 | } | |
187 | #endif | |
188 | ||
189 | #ifdef CONFIG_LINUX | |
190 | static void sigbus_reraise(void) | |
191 | { | |
192 | sigset_t set; | |
193 | struct sigaction action; | |
194 | ||
195 | memset(&action, 0, sizeof(action)); | |
196 | action.sa_handler = SIG_DFL; | |
197 | if (!sigaction(SIGBUS, &action, NULL)) { | |
198 | raise(SIGBUS); | |
199 | sigemptyset(&set); | |
200 | sigaddset(&set, SIGBUS); | |
201 | sigprocmask(SIG_UNBLOCK, &set, NULL); | |
202 | } | |
203 | perror("Failed to re-raise SIGBUS!\n"); | |
204 | abort(); | |
205 | } | |
206 | ||
207 | static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo, | |
208 | void *ctx) | |
209 | { | |
210 | if (kvm_on_sigbus(siginfo->ssi_code, | |
211 | (void *)(intptr_t)siginfo->ssi_addr)) { | |
212 | sigbus_reraise(); | |
213 | } | |
214 | } | |
215 | ||
216 | static void qemu_init_sigbus(void) | |
217 | { | |
218 | struct sigaction action; | |
219 | ||
220 | memset(&action, 0, sizeof(action)); | |
221 | action.sa_flags = SA_SIGINFO; | |
222 | action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler; | |
223 | sigaction(SIGBUS, &action, NULL); | |
224 | ||
225 | prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0); | |
226 | } | |
227 | ||
228 | static void qemu_kvm_eat_signals(CPUState *env) | |
229 | { | |
230 | struct timespec ts = { 0, 0 }; | |
231 | siginfo_t siginfo; | |
232 | sigset_t waitset; | |
233 | sigset_t chkset; | |
234 | int r; | |
235 | ||
236 | sigemptyset(&waitset); | |
237 | sigaddset(&waitset, SIG_IPI); | |
238 | sigaddset(&waitset, SIGBUS); | |
239 | ||
240 | do { | |
241 | r = sigtimedwait(&waitset, &siginfo, &ts); | |
242 | if (r == -1 && !(errno == EAGAIN || errno == EINTR)) { | |
243 | perror("sigtimedwait"); | |
244 | exit(1); | |
245 | } | |
246 | ||
247 | switch (r) { | |
248 | case SIGBUS: | |
249 | if (kvm_on_sigbus_vcpu(env, siginfo.si_code, siginfo.si_addr)) { | |
250 | sigbus_reraise(); | |
251 | } | |
252 | break; | |
253 | default: | |
254 | break; | |
255 | } | |
256 | ||
257 | r = sigpending(&chkset); | |
258 | if (r == -1) { | |
259 | perror("sigpending"); | |
260 | exit(1); | |
261 | } | |
262 | } while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS)); | |
263 | ||
264 | #ifndef CONFIG_IOTHREAD | |
265 | if (sigismember(&chkset, SIGIO) || sigismember(&chkset, SIGALRM)) { | |
266 | qemu_notify_event(); | |
267 | } | |
268 | #endif | |
269 | } | |
270 | ||
271 | #else /* !CONFIG_LINUX */ | |
272 | ||
273 | static void qemu_init_sigbus(void) | |
274 | { | |
275 | } | |
276 | ||
277 | static void qemu_kvm_eat_signals(CPUState *env) | |
278 | { | |
279 | } | |
280 | #endif /* !CONFIG_LINUX */ | |
281 | ||
282 | #ifndef _WIN32 | |
283 | static int io_thread_fd = -1; | |
284 | ||
285 | static void qemu_event_increment(void) | |
286 | { | |
287 | /* Write 8 bytes to be compatible with eventfd. */ | |
288 | static const uint64_t val = 1; | |
289 | ssize_t ret; | |
290 | ||
291 | if (io_thread_fd == -1) { | |
292 | return; | |
293 | } | |
294 | do { | |
295 | ret = write(io_thread_fd, &val, sizeof(val)); | |
296 | } while (ret < 0 && errno == EINTR); | |
297 | ||
298 | /* EAGAIN is fine, a read must be pending. */ | |
299 | if (ret < 0 && errno != EAGAIN) { | |
300 | fprintf(stderr, "qemu_event_increment: write() filed: %s\n", | |
301 | strerror(errno)); | |
302 | exit (1); | |
303 | } | |
304 | } | |
305 | ||
306 | static void qemu_event_read(void *opaque) | |
307 | { | |
308 | int fd = (intptr_t)opaque; | |
309 | ssize_t len; | |
310 | char buffer[512]; | |
311 | ||
312 | /* Drain the notify pipe. For eventfd, only 8 bytes will be read. */ | |
313 | do { | |
314 | len = read(fd, buffer, sizeof(buffer)); | |
315 | } while ((len == -1 && errno == EINTR) || len == sizeof(buffer)); | |
316 | } | |
317 | ||
318 | static int qemu_event_init(void) | |
319 | { | |
320 | int err; | |
321 | int fds[2]; | |
322 | ||
323 | err = qemu_eventfd(fds); | |
324 | if (err == -1) { | |
325 | return -errno; | |
326 | } | |
327 | err = fcntl_setfl(fds[0], O_NONBLOCK); | |
328 | if (err < 0) { | |
329 | goto fail; | |
330 | } | |
331 | err = fcntl_setfl(fds[1], O_NONBLOCK); | |
332 | if (err < 0) { | |
333 | goto fail; | |
334 | } | |
335 | qemu_set_fd_handler2(fds[0], NULL, qemu_event_read, NULL, | |
336 | (void *)(intptr_t)fds[0]); | |
337 | ||
338 | io_thread_fd = fds[1]; | |
339 | return 0; | |
340 | ||
341 | fail: | |
342 | close(fds[0]); | |
343 | close(fds[1]); | |
344 | return err; | |
345 | } | |
346 | ||
347 | static void dummy_signal(int sig) | |
348 | { | |
349 | } | |
350 | ||
351 | /* If we have signalfd, we mask out the signals we want to handle and then | |
352 | * use signalfd to listen for them. We rely on whatever the current signal | |
353 | * handler is to dispatch the signals when we receive them. | |
354 | */ | |
355 | static void sigfd_handler(void *opaque) | |
356 | { | |
357 | int fd = (intptr_t)opaque; | |
358 | struct qemu_signalfd_siginfo info; | |
359 | struct sigaction action; | |
360 | ssize_t len; | |
361 | ||
362 | while (1) { | |
363 | do { | |
364 | len = read(fd, &info, sizeof(info)); | |
365 | } while (len == -1 && errno == EINTR); | |
366 | ||
367 | if (len == -1 && errno == EAGAIN) { | |
368 | break; | |
369 | } | |
370 | ||
371 | if (len != sizeof(info)) { | |
372 | printf("read from sigfd returned %zd: %m\n", len); | |
373 | return; | |
374 | } | |
375 | ||
376 | sigaction(info.ssi_signo, NULL, &action); | |
377 | if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) { | |
378 | action.sa_sigaction(info.ssi_signo, | |
379 | (siginfo_t *)&info, NULL); | |
380 | } else if (action.sa_handler) { | |
381 | action.sa_handler(info.ssi_signo); | |
382 | } | |
383 | } | |
384 | } | |
385 | ||
386 | static int qemu_signal_init(void) | |
387 | { | |
388 | int sigfd; | |
389 | sigset_t set; | |
390 | ||
391 | #ifdef CONFIG_IOTHREAD | |
392 | /* SIGUSR2 used by posix-aio-compat.c */ | |
393 | sigemptyset(&set); | |
394 | sigaddset(&set, SIGUSR2); | |
395 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); | |
396 | ||
397 | sigemptyset(&set); | |
398 | sigaddset(&set, SIGIO); | |
399 | sigaddset(&set, SIGALRM); | |
400 | sigaddset(&set, SIG_IPI); | |
401 | sigaddset(&set, SIGBUS); | |
402 | pthread_sigmask(SIG_BLOCK, &set, NULL); | |
403 | #else | |
404 | sigemptyset(&set); | |
405 | sigaddset(&set, SIGBUS); | |
406 | if (kvm_enabled()) { | |
407 | /* | |
408 | * We need to process timer signals synchronously to avoid a race | |
409 | * between exit_request check and KVM vcpu entry. | |
410 | */ | |
411 | sigaddset(&set, SIGIO); | |
412 | sigaddset(&set, SIGALRM); | |
413 | } | |
414 | #endif | |
415 | ||
416 | sigfd = qemu_signalfd(&set); | |
417 | if (sigfd == -1) { | |
418 | fprintf(stderr, "failed to create signalfd\n"); | |
419 | return -errno; | |
420 | } | |
421 | ||
422 | fcntl_setfl(sigfd, O_NONBLOCK); | |
423 | ||
424 | qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, | |
425 | (void *)(intptr_t)sigfd); | |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
430 | static void qemu_kvm_init_cpu_signals(CPUState *env) | |
431 | { | |
432 | int r; | |
433 | sigset_t set; | |
434 | struct sigaction sigact; | |
435 | ||
436 | memset(&sigact, 0, sizeof(sigact)); | |
437 | sigact.sa_handler = dummy_signal; | |
438 | sigaction(SIG_IPI, &sigact, NULL); | |
439 | ||
440 | #ifdef CONFIG_IOTHREAD | |
441 | pthread_sigmask(SIG_BLOCK, NULL, &set); | |
442 | sigdelset(&set, SIG_IPI); | |
443 | sigdelset(&set, SIGBUS); | |
444 | r = kvm_set_signal_mask(env, &set); | |
445 | if (r) { | |
446 | fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r)); | |
447 | exit(1); | |
448 | } | |
449 | #else | |
450 | sigemptyset(&set); | |
451 | sigaddset(&set, SIG_IPI); | |
452 | sigaddset(&set, SIGIO); | |
453 | sigaddset(&set, SIGALRM); | |
454 | pthread_sigmask(SIG_BLOCK, &set, NULL); | |
455 | ||
456 | pthread_sigmask(SIG_BLOCK, NULL, &set); | |
457 | sigdelset(&set, SIGIO); | |
458 | sigdelset(&set, SIGALRM); | |
459 | #endif | |
460 | sigdelset(&set, SIG_IPI); | |
461 | sigdelset(&set, SIGBUS); | |
462 | r = kvm_set_signal_mask(env, &set); | |
463 | if (r) { | |
464 | fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r)); | |
465 | exit(1); | |
466 | } | |
467 | } | |
468 | ||
469 | static void qemu_tcg_init_cpu_signals(void) | |
470 | { | |
471 | #ifdef CONFIG_IOTHREAD | |
472 | sigset_t set; | |
473 | struct sigaction sigact; | |
474 | ||
475 | memset(&sigact, 0, sizeof(sigact)); | |
476 | sigact.sa_handler = cpu_signal; | |
477 | sigaction(SIG_IPI, &sigact, NULL); | |
478 | ||
479 | sigemptyset(&set); | |
480 | sigaddset(&set, SIG_IPI); | |
481 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); | |
482 | #endif | |
483 | } | |
484 | ||
485 | #else /* _WIN32 */ | |
486 | ||
487 | HANDLE qemu_event_handle; | |
488 | ||
489 | static void dummy_event_handler(void *opaque) | |
490 | { | |
491 | } | |
492 | ||
493 | static int qemu_event_init(void) | |
494 | { | |
495 | qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL); | |
496 | if (!qemu_event_handle) { | |
497 | fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError()); | |
498 | return -1; | |
499 | } | |
500 | qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL); | |
501 | return 0; | |
502 | } | |
503 | ||
504 | static void qemu_event_increment(void) | |
505 | { | |
506 | if (!SetEvent(qemu_event_handle)) { | |
507 | fprintf(stderr, "qemu_event_increment: SetEvent failed: %ld\n", | |
508 | GetLastError()); | |
509 | exit (1); | |
510 | } | |
511 | } | |
512 | ||
513 | static int qemu_signal_init(void) | |
514 | { | |
515 | return 0; | |
516 | } | |
517 | ||
518 | static void qemu_kvm_init_cpu_signals(CPUState *env) | |
519 | { | |
520 | abort(); | |
521 | } | |
522 | ||
523 | static void qemu_tcg_init_cpu_signals(void) | |
524 | { | |
525 | } | |
526 | #endif /* _WIN32 */ | |
527 | ||
528 | #ifndef CONFIG_IOTHREAD | |
529 | int qemu_init_main_loop(void) | |
530 | { | |
531 | int ret; | |
532 | ||
533 | ret = qemu_signal_init(); | |
534 | if (ret) { | |
535 | return ret; | |
536 | } | |
537 | ||
538 | qemu_init_sigbus(); | |
539 | ||
540 | return qemu_event_init(); | |
541 | } | |
542 | ||
543 | void qemu_main_loop_start(void) | |
544 | { | |
545 | } | |
546 | ||
547 | void qemu_init_vcpu(void *_env) | |
548 | { | |
549 | CPUState *env = _env; | |
550 | int r; | |
551 | ||
552 | env->nr_cores = smp_cores; | |
553 | env->nr_threads = smp_threads; | |
554 | ||
555 | if (kvm_enabled()) { | |
556 | r = kvm_init_vcpu(env); | |
557 | if (r < 0) { | |
558 | fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r)); | |
559 | exit(1); | |
560 | } | |
561 | qemu_kvm_init_cpu_signals(env); | |
562 | } else { | |
563 | qemu_tcg_init_cpu_signals(); | |
564 | } | |
565 | } | |
566 | ||
567 | int qemu_cpu_is_self(void *env) | |
568 | { | |
569 | return 1; | |
570 | } | |
571 | ||
572 | void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) | |
573 | { | |
574 | func(data); | |
575 | } | |
576 | ||
577 | void resume_all_vcpus(void) | |
578 | { | |
579 | } | |
580 | ||
581 | void pause_all_vcpus(void) | |
582 | { | |
583 | } | |
584 | ||
585 | void qemu_cpu_kick(void *env) | |
586 | { | |
587 | } | |
588 | ||
589 | void qemu_cpu_kick_self(void) | |
590 | { | |
591 | #ifndef _WIN32 | |
592 | assert(cpu_single_env); | |
593 | ||
594 | raise(SIG_IPI); | |
595 | #else | |
596 | abort(); | |
597 | #endif | |
598 | } | |
599 | ||
600 | void qemu_notify_event(void) | |
601 | { | |
602 | CPUState *env = cpu_single_env; | |
603 | ||
604 | qemu_event_increment (); | |
605 | if (env) { | |
606 | cpu_exit(env); | |
607 | } | |
608 | if (next_cpu && env != next_cpu) { | |
609 | cpu_exit(next_cpu); | |
610 | } | |
611 | exit_request = 1; | |
612 | } | |
613 | ||
614 | void qemu_mutex_lock_iothread(void) {} | |
615 | void qemu_mutex_unlock_iothread(void) {} | |
616 | ||
617 | void cpu_stop_current(void) | |
618 | { | |
619 | } | |
620 | ||
621 | void vm_stop(int reason) | |
622 | { | |
623 | do_vm_stop(reason); | |
624 | } | |
625 | ||
626 | #else /* CONFIG_IOTHREAD */ | |
627 | ||
628 | QemuMutex qemu_global_mutex; | |
629 | static QemuMutex qemu_fair_mutex; | |
630 | ||
631 | static QemuThread io_thread; | |
632 | ||
633 | static QemuThread *tcg_cpu_thread; | |
634 | static QemuCond *tcg_halt_cond; | |
635 | ||
636 | static int qemu_system_ready; | |
637 | /* cpu creation */ | |
638 | static QemuCond qemu_cpu_cond; | |
639 | /* system init */ | |
640 | static QemuCond qemu_system_cond; | |
641 | static QemuCond qemu_pause_cond; | |
642 | static QemuCond qemu_work_cond; | |
643 | ||
644 | int qemu_init_main_loop(void) | |
645 | { | |
646 | int ret; | |
647 | ||
648 | qemu_init_sigbus(); | |
649 | ||
650 | ret = qemu_signal_init(); | |
651 | if (ret) { | |
652 | return ret; | |
653 | } | |
654 | ||
655 | /* Note eventfd must be drained before signalfd handlers run */ | |
656 | ret = qemu_event_init(); | |
657 | if (ret) { | |
658 | return ret; | |
659 | } | |
660 | ||
661 | qemu_cond_init(&qemu_cpu_cond); | |
662 | qemu_cond_init(&qemu_system_cond); | |
663 | qemu_cond_init(&qemu_pause_cond); | |
664 | qemu_cond_init(&qemu_work_cond); | |
665 | qemu_mutex_init(&qemu_fair_mutex); | |
666 | qemu_mutex_init(&qemu_global_mutex); | |
667 | qemu_mutex_lock(&qemu_global_mutex); | |
668 | ||
669 | qemu_thread_get_self(&io_thread); | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | void qemu_main_loop_start(void) | |
675 | { | |
676 | qemu_system_ready = 1; | |
677 | qemu_cond_broadcast(&qemu_system_cond); | |
678 | } | |
679 | ||
680 | void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) | |
681 | { | |
682 | struct qemu_work_item wi; | |
683 | ||
684 | if (qemu_cpu_is_self(env)) { | |
685 | func(data); | |
686 | return; | |
687 | } | |
688 | ||
689 | wi.func = func; | |
690 | wi.data = data; | |
691 | if (!env->queued_work_first) { | |
692 | env->queued_work_first = &wi; | |
693 | } else { | |
694 | env->queued_work_last->next = &wi; | |
695 | } | |
696 | env->queued_work_last = &wi; | |
697 | wi.next = NULL; | |
698 | wi.done = false; | |
699 | ||
700 | qemu_cpu_kick(env); | |
701 | while (!wi.done) { | |
702 | CPUState *self_env = cpu_single_env; | |
703 | ||
704 | qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex); | |
705 | cpu_single_env = self_env; | |
706 | } | |
707 | } | |
708 | ||
709 | static void flush_queued_work(CPUState *env) | |
710 | { | |
711 | struct qemu_work_item *wi; | |
712 | ||
713 | if (!env->queued_work_first) { | |
714 | return; | |
715 | } | |
716 | ||
717 | while ((wi = env->queued_work_first)) { | |
718 | env->queued_work_first = wi->next; | |
719 | wi->func(wi->data); | |
720 | wi->done = true; | |
721 | } | |
722 | env->queued_work_last = NULL; | |
723 | qemu_cond_broadcast(&qemu_work_cond); | |
724 | } | |
725 | ||
726 | static void qemu_wait_io_event_common(CPUState *env) | |
727 | { | |
728 | if (env->stop) { | |
729 | env->stop = 0; | |
730 | env->stopped = 1; | |
731 | qemu_cond_signal(&qemu_pause_cond); | |
732 | } | |
733 | flush_queued_work(env); | |
734 | env->thread_kicked = false; | |
735 | } | |
736 | ||
737 | static void qemu_tcg_wait_io_event(void) | |
738 | { | |
739 | CPUState *env; | |
740 | ||
741 | while (all_cpu_threads_idle()) { | |
742 | qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex); | |
743 | } | |
744 | ||
745 | qemu_mutex_unlock(&qemu_global_mutex); | |
746 | ||
747 | /* | |
748 | * Users of qemu_global_mutex can be starved, having no chance | |
749 | * to acquire it since this path will get to it first. | |
750 | * So use another lock to provide fairness. | |
751 | */ | |
752 | qemu_mutex_lock(&qemu_fair_mutex); | |
753 | qemu_mutex_unlock(&qemu_fair_mutex); | |
754 | ||
755 | qemu_mutex_lock(&qemu_global_mutex); | |
756 | ||
757 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
758 | qemu_wait_io_event_common(env); | |
759 | } | |
760 | } | |
761 | ||
762 | static void qemu_kvm_wait_io_event(CPUState *env) | |
763 | { | |
764 | while (cpu_thread_is_idle(env)) { | |
765 | qemu_cond_wait(env->halt_cond, &qemu_global_mutex); | |
766 | } | |
767 | ||
768 | qemu_kvm_eat_signals(env); | |
769 | qemu_wait_io_event_common(env); | |
770 | } | |
771 | ||
772 | static void *qemu_kvm_cpu_thread_fn(void *arg) | |
773 | { | |
774 | CPUState *env = arg; | |
775 | int r; | |
776 | ||
777 | qemu_mutex_lock(&qemu_global_mutex); | |
778 | qemu_thread_get_self(env->thread); | |
779 | env->thread_id = qemu_get_thread_id(); | |
780 | ||
781 | r = kvm_init_vcpu(env); | |
782 | if (r < 0) { | |
783 | fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r)); | |
784 | exit(1); | |
785 | } | |
786 | ||
787 | qemu_kvm_init_cpu_signals(env); | |
788 | ||
789 | /* signal CPU creation */ | |
790 | env->created = 1; | |
791 | qemu_cond_signal(&qemu_cpu_cond); | |
792 | ||
793 | /* and wait for machine initialization */ | |
794 | while (!qemu_system_ready) { | |
795 | qemu_cond_wait(&qemu_system_cond, &qemu_global_mutex); | |
796 | } | |
797 | ||
798 | while (1) { | |
799 | if (cpu_can_run(env)) { | |
800 | r = kvm_cpu_exec(env); | |
801 | if (r == EXCP_DEBUG) { | |
802 | cpu_handle_guest_debug(env); | |
803 | } | |
804 | } | |
805 | qemu_kvm_wait_io_event(env); | |
806 | } | |
807 | ||
808 | return NULL; | |
809 | } | |
810 | ||
811 | static void *qemu_tcg_cpu_thread_fn(void *arg) | |
812 | { | |
813 | CPUState *env = arg; | |
814 | ||
815 | qemu_tcg_init_cpu_signals(); | |
816 | qemu_thread_get_self(env->thread); | |
817 | ||
818 | /* signal CPU creation */ | |
819 | qemu_mutex_lock(&qemu_global_mutex); | |
820 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
821 | env->thread_id = qemu_get_thread_id(); | |
822 | env->created = 1; | |
823 | } | |
824 | qemu_cond_signal(&qemu_cpu_cond); | |
825 | ||
826 | /* and wait for machine initialization */ | |
827 | while (!qemu_system_ready) { | |
828 | qemu_cond_wait(&qemu_system_cond, &qemu_global_mutex); | |
829 | } | |
830 | ||
831 | while (1) { | |
832 | cpu_exec_all(); | |
833 | qemu_tcg_wait_io_event(); | |
834 | } | |
835 | ||
836 | return NULL; | |
837 | } | |
838 | ||
839 | static void qemu_cpu_kick_thread(CPUState *env) | |
840 | { | |
841 | #ifndef _WIN32 | |
842 | int err; | |
843 | ||
844 | err = pthread_kill(env->thread->thread, SIG_IPI); | |
845 | if (err) { | |
846 | fprintf(stderr, "qemu:%s: %s", __func__, strerror(err)); | |
847 | exit(1); | |
848 | } | |
849 | #else /* _WIN32 */ | |
850 | if (!qemu_cpu_is_self(env)) { | |
851 | SuspendThread(env->thread->thread); | |
852 | cpu_signal(0); | |
853 | ResumeThread(env->thread->thread); | |
854 | } | |
855 | #endif | |
856 | } | |
857 | ||
858 | void qemu_cpu_kick(void *_env) | |
859 | { | |
860 | CPUState *env = _env; | |
861 | ||
862 | qemu_cond_broadcast(env->halt_cond); | |
863 | if (!env->thread_kicked) { | |
864 | qemu_cpu_kick_thread(env); | |
865 | env->thread_kicked = true; | |
866 | } | |
867 | } | |
868 | ||
869 | void qemu_cpu_kick_self(void) | |
870 | { | |
871 | #ifndef _WIN32 | |
872 | assert(cpu_single_env); | |
873 | ||
874 | if (!cpu_single_env->thread_kicked) { | |
875 | qemu_cpu_kick_thread(cpu_single_env); | |
876 | cpu_single_env->thread_kicked = true; | |
877 | } | |
878 | #else | |
879 | abort(); | |
880 | #endif | |
881 | } | |
882 | ||
883 | int qemu_cpu_is_self(void *_env) | |
884 | { | |
885 | CPUState *env = _env; | |
886 | ||
887 | return qemu_thread_is_self(env->thread); | |
888 | } | |
889 | ||
890 | void qemu_mutex_lock_iothread(void) | |
891 | { | |
892 | if (kvm_enabled()) { | |
893 | qemu_mutex_lock(&qemu_global_mutex); | |
894 | } else { | |
895 | qemu_mutex_lock(&qemu_fair_mutex); | |
896 | if (qemu_mutex_trylock(&qemu_global_mutex)) { | |
897 | qemu_cpu_kick_thread(first_cpu); | |
898 | qemu_mutex_lock(&qemu_global_mutex); | |
899 | } | |
900 | qemu_mutex_unlock(&qemu_fair_mutex); | |
901 | } | |
902 | } | |
903 | ||
904 | void qemu_mutex_unlock_iothread(void) | |
905 | { | |
906 | qemu_mutex_unlock(&qemu_global_mutex); | |
907 | } | |
908 | ||
909 | static int all_vcpus_paused(void) | |
910 | { | |
911 | CPUState *penv = first_cpu; | |
912 | ||
913 | while (penv) { | |
914 | if (!penv->stopped) { | |
915 | return 0; | |
916 | } | |
917 | penv = (CPUState *)penv->next_cpu; | |
918 | } | |
919 | ||
920 | return 1; | |
921 | } | |
922 | ||
923 | void pause_all_vcpus(void) | |
924 | { | |
925 | CPUState *penv = first_cpu; | |
926 | ||
927 | while (penv) { | |
928 | penv->stop = 1; | |
929 | qemu_cpu_kick(penv); | |
930 | penv = (CPUState *)penv->next_cpu; | |
931 | } | |
932 | ||
933 | while (!all_vcpus_paused()) { | |
934 | qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex); | |
935 | penv = first_cpu; | |
936 | while (penv) { | |
937 | qemu_cpu_kick(penv); | |
938 | penv = (CPUState *)penv->next_cpu; | |
939 | } | |
940 | } | |
941 | } | |
942 | ||
943 | void resume_all_vcpus(void) | |
944 | { | |
945 | CPUState *penv = first_cpu; | |
946 | ||
947 | while (penv) { | |
948 | penv->stop = 0; | |
949 | penv->stopped = 0; | |
950 | qemu_cpu_kick(penv); | |
951 | penv = (CPUState *)penv->next_cpu; | |
952 | } | |
953 | } | |
954 | ||
955 | static void qemu_tcg_init_vcpu(void *_env) | |
956 | { | |
957 | CPUState *env = _env; | |
958 | ||
959 | /* share a single thread for all cpus with TCG */ | |
960 | if (!tcg_cpu_thread) { | |
961 | env->thread = qemu_mallocz(sizeof(QemuThread)); | |
962 | env->halt_cond = qemu_mallocz(sizeof(QemuCond)); | |
963 | qemu_cond_init(env->halt_cond); | |
964 | qemu_thread_create(env->thread, qemu_tcg_cpu_thread_fn, env); | |
965 | while (env->created == 0) { | |
966 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
967 | } | |
968 | tcg_cpu_thread = env->thread; | |
969 | tcg_halt_cond = env->halt_cond; | |
970 | } else { | |
971 | env->thread = tcg_cpu_thread; | |
972 | env->halt_cond = tcg_halt_cond; | |
973 | } | |
974 | } | |
975 | ||
976 | static void qemu_kvm_start_vcpu(CPUState *env) | |
977 | { | |
978 | env->thread = qemu_mallocz(sizeof(QemuThread)); | |
979 | env->halt_cond = qemu_mallocz(sizeof(QemuCond)); | |
980 | qemu_cond_init(env->halt_cond); | |
981 | qemu_thread_create(env->thread, qemu_kvm_cpu_thread_fn, env); | |
982 | while (env->created == 0) { | |
983 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
984 | } | |
985 | } | |
986 | ||
987 | void qemu_init_vcpu(void *_env) | |
988 | { | |
989 | CPUState *env = _env; | |
990 | ||
991 | env->nr_cores = smp_cores; | |
992 | env->nr_threads = smp_threads; | |
993 | if (kvm_enabled()) { | |
994 | qemu_kvm_start_vcpu(env); | |
995 | } else { | |
996 | qemu_tcg_init_vcpu(env); | |
997 | } | |
998 | } | |
999 | ||
1000 | void qemu_notify_event(void) | |
1001 | { | |
1002 | qemu_event_increment(); | |
1003 | } | |
1004 | ||
1005 | void cpu_stop_current(void) | |
1006 | { | |
1007 | if (cpu_single_env) { | |
1008 | cpu_single_env->stop = 0; | |
1009 | cpu_single_env->stopped = 1; | |
1010 | cpu_exit(cpu_single_env); | |
1011 | qemu_cond_signal(&qemu_pause_cond); | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | void vm_stop(int reason) | |
1016 | { | |
1017 | if (!qemu_thread_is_self(&io_thread)) { | |
1018 | qemu_system_vmstop_request(reason); | |
1019 | /* | |
1020 | * FIXME: should not return to device code in case | |
1021 | * vm_stop() has been requested. | |
1022 | */ | |
1023 | cpu_stop_current(); | |
1024 | return; | |
1025 | } | |
1026 | do_vm_stop(reason); | |
1027 | } | |
1028 | ||
1029 | #endif | |
1030 | ||
1031 | static int tcg_cpu_exec(CPUState *env) | |
1032 | { | |
1033 | int ret; | |
1034 | #ifdef CONFIG_PROFILER | |
1035 | int64_t ti; | |
1036 | #endif | |
1037 | ||
1038 | #ifdef CONFIG_PROFILER | |
1039 | ti = profile_getclock(); | |
1040 | #endif | |
1041 | if (use_icount) { | |
1042 | int64_t count; | |
1043 | int decr; | |
1044 | qemu_icount -= (env->icount_decr.u16.low + env->icount_extra); | |
1045 | env->icount_decr.u16.low = 0; | |
1046 | env->icount_extra = 0; | |
1047 | count = qemu_icount_round (qemu_next_deadline()); | |
1048 | qemu_icount += count; | |
1049 | decr = (count > 0xffff) ? 0xffff : count; | |
1050 | count -= decr; | |
1051 | env->icount_decr.u16.low = decr; | |
1052 | env->icount_extra = count; | |
1053 | } | |
1054 | ret = cpu_exec(env); | |
1055 | #ifdef CONFIG_PROFILER | |
1056 | qemu_time += profile_getclock() - ti; | |
1057 | #endif | |
1058 | if (use_icount) { | |
1059 | /* Fold pending instructions back into the | |
1060 | instruction counter, and clear the interrupt flag. */ | |
1061 | qemu_icount -= (env->icount_decr.u16.low | |
1062 | + env->icount_extra); | |
1063 | env->icount_decr.u32 = 0; | |
1064 | env->icount_extra = 0; | |
1065 | } | |
1066 | return ret; | |
1067 | } | |
1068 | ||
1069 | bool cpu_exec_all(void) | |
1070 | { | |
1071 | int r; | |
1072 | ||
1073 | if (next_cpu == NULL) { | |
1074 | next_cpu = first_cpu; | |
1075 | } | |
1076 | for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) { | |
1077 | CPUState *env = next_cpu; | |
1078 | ||
1079 | qemu_clock_enable(vm_clock, | |
1080 | (env->singlestep_enabled & SSTEP_NOTIMER) == 0); | |
1081 | ||
1082 | #ifndef CONFIG_IOTHREAD | |
1083 | if (qemu_alarm_pending()) { | |
1084 | break; | |
1085 | } | |
1086 | #endif | |
1087 | if (cpu_can_run(env)) { | |
1088 | if (kvm_enabled()) { | |
1089 | r = kvm_cpu_exec(env); | |
1090 | qemu_kvm_eat_signals(env); | |
1091 | } else { | |
1092 | r = tcg_cpu_exec(env); | |
1093 | } | |
1094 | if (r == EXCP_DEBUG) { | |
1095 | cpu_handle_guest_debug(env); | |
1096 | break; | |
1097 | } | |
1098 | } else if (env->stop || env->stopped) { | |
1099 | break; | |
1100 | } | |
1101 | } | |
1102 | exit_request = 0; | |
1103 | return !all_cpu_threads_idle(); | |
1104 | } | |
1105 | ||
1106 | void set_numa_modes(void) | |
1107 | { | |
1108 | CPUState *env; | |
1109 | int i; | |
1110 | ||
1111 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
1112 | for (i = 0; i < nb_numa_nodes; i++) { | |
1113 | if (node_cpumask[i] & (1 << env->cpu_index)) { | |
1114 | env->numa_node = i; | |
1115 | } | |
1116 | } | |
1117 | } | |
1118 | } | |
1119 | ||
1120 | void set_cpu_log(const char *optarg) | |
1121 | { | |
1122 | int mask; | |
1123 | const CPULogItem *item; | |
1124 | ||
1125 | mask = cpu_str_to_log_mask(optarg); | |
1126 | if (!mask) { | |
1127 | printf("Log items (comma separated):\n"); | |
1128 | for (item = cpu_log_items; item->mask != 0; item++) { | |
1129 | printf("%-10s %s\n", item->name, item->help); | |
1130 | } | |
1131 | exit(1); | |
1132 | } | |
1133 | cpu_set_log(mask); | |
1134 | } | |
1135 | ||
1136 | /* Return the virtual CPU time, based on the instruction counter. */ | |
1137 | int64_t cpu_get_icount(void) | |
1138 | { | |
1139 | int64_t icount; | |
1140 | CPUState *env = cpu_single_env;; | |
1141 | ||
1142 | icount = qemu_icount; | |
1143 | if (env) { | |
1144 | if (!can_do_io(env)) { | |
1145 | fprintf(stderr, "Bad clock read\n"); | |
1146 | } | |
1147 | icount -= (env->icount_decr.u16.low + env->icount_extra); | |
1148 | } | |
1149 | return qemu_icount_bias + (icount << icount_time_shift); | |
1150 | } | |
1151 | ||
1152 | void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) | |
1153 | { | |
1154 | /* XXX: implement xxx_cpu_list for targets that still miss it */ | |
1155 | #if defined(cpu_list_id) | |
1156 | cpu_list_id(f, cpu_fprintf, optarg); | |
1157 | #elif defined(cpu_list) | |
1158 | cpu_list(f, cpu_fprintf); /* deprecated */ | |
1159 | #endif | |
1160 | } |