root / cpus.c @ b7680cb6
History | View | Annotate | Download (25.3 kB)
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 |
|
38 |
#ifdef SIGRTMIN
|
39 |
#define SIG_IPI (SIGRTMIN+4) |
40 |
#else
|
41 |
#define SIG_IPI SIGUSR1
|
42 |
#endif
|
43 |
|
44 |
#ifdef CONFIG_LINUX
|
45 |
|
46 |
#include <sys/prctl.h> |
47 |
|
48 |
#ifndef PR_MCE_KILL
|
49 |
#define PR_MCE_KILL 33 |
50 |
#endif
|
51 |
|
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 |
|
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 |
|
113 |
int cpu_is_stopped(CPUState *env)
|
114 |
{ |
115 |
return !vm_running || env->stopped;
|
116 |
} |
117 |
|
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);
|
125 |
qemu_aio_flush(); |
126 |
bdrv_flush_all(); |
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; |
135 |
} |
136 |
if (env->stopped || !vm_running) {
|
137 |
return 0; |
138 |
} |
139 |
return 1; |
140 |
} |
141 |
|
142 |
static bool cpu_thread_is_idle(CPUState *env) |
143 |
{ |
144 |
if (env->stop || env->queued_work_first) {
|
145 |
return false; |
146 |
} |
147 |
if (env->stopped || !vm_running) {
|
148 |
return true; |
149 |
} |
150 |
if (!env->halted || qemu_cpu_has_work(env)) {
|
151 |
return false; |
152 |
} |
153 |
return true; |
154 |
} |
155 |
|
156 |
static bool all_cpu_threads_idle(void) |
157 |
{ |
158 |
CPUState *env; |
159 |
|
160 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
161 |
if (!cpu_thread_is_idle(env)) {
|
162 |
return false; |
163 |
} |
164 |
} |
165 |
return true; |
166 |
} |
167 |
|
168 |
static CPUDebugExcpHandler *debug_excp_handler;
|
169 |
|
170 |
CPUDebugExcpHandler *cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler) |
171 |
{ |
172 |
CPUDebugExcpHandler *old_handler = debug_excp_handler; |
173 |
|
174 |
debug_excp_handler = handler; |
175 |
return old_handler;
|
176 |
} |
177 |
|
178 |
static void cpu_handle_debug_exception(CPUState *env) |
179 |
{ |
180 |
CPUWatchpoint *wp; |
181 |
|
182 |
if (!env->watchpoint_hit) {
|
183 |
QTAILQ_FOREACH(wp, &env->watchpoints, entry) { |
184 |
wp->flags &= ~BP_WATCHPOINT_HIT; |
185 |
} |
186 |
} |
187 |
if (debug_excp_handler) {
|
188 |
debug_excp_handler(env); |
189 |
} |
190 |
|
191 |
gdb_set_stop_cpu(env); |
192 |
qemu_system_debug_request(); |
193 |
#ifdef CONFIG_IOTHREAD
|
194 |
env->stopped = 1;
|
195 |
#endif
|
196 |
} |
197 |
|
198 |
#ifdef CONFIG_LINUX
|
199 |
static void sigbus_reraise(void) |
200 |
{ |
201 |
sigset_t set; |
202 |
struct sigaction action;
|
203 |
|
204 |
memset(&action, 0, sizeof(action)); |
205 |
action.sa_handler = SIG_DFL; |
206 |
if (!sigaction(SIGBUS, &action, NULL)) { |
207 |
raise(SIGBUS); |
208 |
sigemptyset(&set); |
209 |
sigaddset(&set, SIGBUS); |
210 |
sigprocmask(SIG_UNBLOCK, &set, NULL);
|
211 |
} |
212 |
perror("Failed to re-raise SIGBUS!\n");
|
213 |
abort(); |
214 |
} |
215 |
|
216 |
static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo, |
217 |
void *ctx)
|
218 |
{ |
219 |
if (kvm_on_sigbus(siginfo->ssi_code,
|
220 |
(void *)(intptr_t)siginfo->ssi_addr)) {
|
221 |
sigbus_reraise(); |
222 |
} |
223 |
} |
224 |
|
225 |
static void qemu_init_sigbus(void) |
226 |
{ |
227 |
struct sigaction action;
|
228 |
|
229 |
memset(&action, 0, sizeof(action)); |
230 |
action.sa_flags = SA_SIGINFO; |
231 |
action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler; |
232 |
sigaction(SIGBUS, &action, NULL);
|
233 |
|
234 |
prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0); |
235 |
} |
236 |
|
237 |
#else /* !CONFIG_LINUX */ |
238 |
|
239 |
static void qemu_init_sigbus(void) |
240 |
{ |
241 |
} |
242 |
#endif /* !CONFIG_LINUX */ |
243 |
|
244 |
#ifndef _WIN32
|
245 |
static int io_thread_fd = -1; |
246 |
|
247 |
static void qemu_event_increment(void) |
248 |
{ |
249 |
/* Write 8 bytes to be compatible with eventfd. */
|
250 |
static const uint64_t val = 1; |
251 |
ssize_t ret; |
252 |
|
253 |
if (io_thread_fd == -1) { |
254 |
return;
|
255 |
} |
256 |
do {
|
257 |
ret = write(io_thread_fd, &val, sizeof(val));
|
258 |
} while (ret < 0 && errno == EINTR); |
259 |
|
260 |
/* EAGAIN is fine, a read must be pending. */
|
261 |
if (ret < 0 && errno != EAGAIN) { |
262 |
fprintf(stderr, "qemu_event_increment: write() filed: %s\n",
|
263 |
strerror(errno)); |
264 |
exit (1);
|
265 |
} |
266 |
} |
267 |
|
268 |
static void qemu_event_read(void *opaque) |
269 |
{ |
270 |
int fd = (unsigned long)opaque; |
271 |
ssize_t len; |
272 |
char buffer[512]; |
273 |
|
274 |
/* Drain the notify pipe. For eventfd, only 8 bytes will be read. */
|
275 |
do {
|
276 |
len = read(fd, buffer, sizeof(buffer));
|
277 |
} while ((len == -1 && errno == EINTR) || len == sizeof(buffer)); |
278 |
} |
279 |
|
280 |
static int qemu_event_init(void) |
281 |
{ |
282 |
int err;
|
283 |
int fds[2]; |
284 |
|
285 |
err = qemu_eventfd(fds); |
286 |
if (err == -1) { |
287 |
return -errno;
|
288 |
} |
289 |
err = fcntl_setfl(fds[0], O_NONBLOCK);
|
290 |
if (err < 0) { |
291 |
goto fail;
|
292 |
} |
293 |
err = fcntl_setfl(fds[1], O_NONBLOCK);
|
294 |
if (err < 0) { |
295 |
goto fail;
|
296 |
} |
297 |
qemu_set_fd_handler2(fds[0], NULL, qemu_event_read, NULL, |
298 |
(void *)(unsigned long)fds[0]); |
299 |
|
300 |
io_thread_fd = fds[1];
|
301 |
return 0; |
302 |
|
303 |
fail:
|
304 |
close(fds[0]);
|
305 |
close(fds[1]);
|
306 |
return err;
|
307 |
} |
308 |
|
309 |
static void dummy_signal(int sig) |
310 |
{ |
311 |
} |
312 |
|
313 |
/* If we have signalfd, we mask out the signals we want to handle and then
|
314 |
* use signalfd to listen for them. We rely on whatever the current signal
|
315 |
* handler is to dispatch the signals when we receive them.
|
316 |
*/
|
317 |
static void sigfd_handler(void *opaque) |
318 |
{ |
319 |
int fd = (unsigned long) opaque; |
320 |
struct qemu_signalfd_siginfo info;
|
321 |
struct sigaction action;
|
322 |
ssize_t len; |
323 |
|
324 |
while (1) { |
325 |
do {
|
326 |
len = read(fd, &info, sizeof(info));
|
327 |
} while (len == -1 && errno == EINTR); |
328 |
|
329 |
if (len == -1 && errno == EAGAIN) { |
330 |
break;
|
331 |
} |
332 |
|
333 |
if (len != sizeof(info)) { |
334 |
printf("read from sigfd returned %zd: %m\n", len);
|
335 |
return;
|
336 |
} |
337 |
|
338 |
sigaction(info.ssi_signo, NULL, &action);
|
339 |
if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) {
|
340 |
action.sa_sigaction(info.ssi_signo, |
341 |
(siginfo_t *)&info, NULL);
|
342 |
} else if (action.sa_handler) { |
343 |
action.sa_handler(info.ssi_signo); |
344 |
} |
345 |
} |
346 |
} |
347 |
|
348 |
static int qemu_signalfd_init(sigset_t mask) |
349 |
{ |
350 |
int sigfd;
|
351 |
|
352 |
sigfd = qemu_signalfd(&mask); |
353 |
if (sigfd == -1) { |
354 |
fprintf(stderr, "failed to create signalfd\n");
|
355 |
return -errno;
|
356 |
} |
357 |
|
358 |
fcntl_setfl(sigfd, O_NONBLOCK); |
359 |
|
360 |
qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, |
361 |
(void *)(unsigned long) sigfd); |
362 |
|
363 |
return 0; |
364 |
} |
365 |
|
366 |
static void qemu_kvm_eat_signals(CPUState *env) |
367 |
{ |
368 |
struct timespec ts = { 0, 0 }; |
369 |
siginfo_t siginfo; |
370 |
sigset_t waitset; |
371 |
sigset_t chkset; |
372 |
int r;
|
373 |
|
374 |
sigemptyset(&waitset); |
375 |
sigaddset(&waitset, SIG_IPI); |
376 |
sigaddset(&waitset, SIGBUS); |
377 |
|
378 |
do {
|
379 |
r = sigtimedwait(&waitset, &siginfo, &ts); |
380 |
if (r == -1 && !(errno == EAGAIN || errno == EINTR)) { |
381 |
perror("sigtimedwait");
|
382 |
exit(1);
|
383 |
} |
384 |
|
385 |
switch (r) {
|
386 |
case SIGBUS:
|
387 |
if (kvm_on_sigbus_vcpu(env, siginfo.si_code, siginfo.si_addr)) {
|
388 |
sigbus_reraise(); |
389 |
} |
390 |
break;
|
391 |
default:
|
392 |
break;
|
393 |
} |
394 |
|
395 |
r = sigpending(&chkset); |
396 |
if (r == -1) { |
397 |
perror("sigpending");
|
398 |
exit(1);
|
399 |
} |
400 |
} while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
|
401 |
|
402 |
#ifndef CONFIG_IOTHREAD
|
403 |
if (sigismember(&chkset, SIGIO) || sigismember(&chkset, SIGALRM)) {
|
404 |
qemu_notify_event(); |
405 |
} |
406 |
#endif
|
407 |
} |
408 |
|
409 |
#else /* _WIN32 */ |
410 |
|
411 |
HANDLE qemu_event_handle; |
412 |
|
413 |
static void dummy_event_handler(void *opaque) |
414 |
{ |
415 |
} |
416 |
|
417 |
static int qemu_event_init(void) |
418 |
{ |
419 |
qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL); |
420 |
if (!qemu_event_handle) {
|
421 |
fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError());
|
422 |
return -1; |
423 |
} |
424 |
qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL);
|
425 |
return 0; |
426 |
} |
427 |
|
428 |
static void qemu_event_increment(void) |
429 |
{ |
430 |
if (!SetEvent(qemu_event_handle)) {
|
431 |
fprintf(stderr, "qemu_event_increment: SetEvent failed: %ld\n",
|
432 |
GetLastError()); |
433 |
exit (1);
|
434 |
} |
435 |
} |
436 |
|
437 |
static void qemu_kvm_eat_signals(CPUState *env) |
438 |
{ |
439 |
} |
440 |
#endif /* _WIN32 */ |
441 |
|
442 |
#ifndef CONFIG_IOTHREAD
|
443 |
static void qemu_kvm_init_cpu_signals(CPUState *env) |
444 |
{ |
445 |
#ifndef _WIN32
|
446 |
int r;
|
447 |
sigset_t set; |
448 |
struct sigaction sigact;
|
449 |
|
450 |
memset(&sigact, 0, sizeof(sigact)); |
451 |
sigact.sa_handler = dummy_signal; |
452 |
sigaction(SIG_IPI, &sigact, NULL);
|
453 |
|
454 |
sigemptyset(&set); |
455 |
sigaddset(&set, SIG_IPI); |
456 |
sigaddset(&set, SIGIO); |
457 |
sigaddset(&set, SIGALRM); |
458 |
pthread_sigmask(SIG_BLOCK, &set, NULL);
|
459 |
|
460 |
pthread_sigmask(SIG_BLOCK, NULL, &set);
|
461 |
sigdelset(&set, SIG_IPI); |
462 |
sigdelset(&set, SIGBUS); |
463 |
sigdelset(&set, SIGIO); |
464 |
sigdelset(&set, SIGALRM); |
465 |
r = kvm_set_signal_mask(env, &set); |
466 |
if (r) {
|
467 |
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
|
468 |
exit(1);
|
469 |
} |
470 |
#endif
|
471 |
} |
472 |
|
473 |
#ifndef _WIN32
|
474 |
static sigset_t block_synchronous_signals(void) |
475 |
{ |
476 |
sigset_t set; |
477 |
|
478 |
sigemptyset(&set); |
479 |
sigaddset(&set, SIGBUS); |
480 |
if (kvm_enabled()) {
|
481 |
/*
|
482 |
* We need to process timer signals synchronously to avoid a race
|
483 |
* between exit_request check and KVM vcpu entry.
|
484 |
*/
|
485 |
sigaddset(&set, SIGIO); |
486 |
sigaddset(&set, SIGALRM); |
487 |
} |
488 |
|
489 |
return set;
|
490 |
} |
491 |
#endif
|
492 |
|
493 |
int qemu_init_main_loop(void) |
494 |
{ |
495 |
#ifndef _WIN32
|
496 |
sigset_t blocked_signals; |
497 |
int ret;
|
498 |
|
499 |
blocked_signals = block_synchronous_signals(); |
500 |
|
501 |
ret = qemu_signalfd_init(blocked_signals); |
502 |
if (ret) {
|
503 |
return ret;
|
504 |
} |
505 |
#endif
|
506 |
|
507 |
qemu_init_sigbus(); |
508 |
|
509 |
return qemu_event_init();
|
510 |
} |
511 |
|
512 |
void qemu_main_loop_start(void) |
513 |
{ |
514 |
} |
515 |
|
516 |
void qemu_init_vcpu(void *_env) |
517 |
{ |
518 |
CPUState *env = _env; |
519 |
int r;
|
520 |
|
521 |
env->nr_cores = smp_cores; |
522 |
env->nr_threads = smp_threads; |
523 |
|
524 |
if (kvm_enabled()) {
|
525 |
r = kvm_init_vcpu(env); |
526 |
if (r < 0) { |
527 |
fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
|
528 |
exit(1);
|
529 |
} |
530 |
qemu_kvm_init_cpu_signals(env); |
531 |
} |
532 |
} |
533 |
|
534 |
int qemu_cpu_is_self(void *env) |
535 |
{ |
536 |
return 1; |
537 |
} |
538 |
|
539 |
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
540 |
{ |
541 |
func(data); |
542 |
} |
543 |
|
544 |
void resume_all_vcpus(void) |
545 |
{ |
546 |
} |
547 |
|
548 |
void pause_all_vcpus(void) |
549 |
{ |
550 |
} |
551 |
|
552 |
void qemu_cpu_kick(void *env) |
553 |
{ |
554 |
} |
555 |
|
556 |
void qemu_cpu_kick_self(void) |
557 |
{ |
558 |
#ifndef _WIN32
|
559 |
assert(cpu_single_env); |
560 |
|
561 |
raise(SIG_IPI); |
562 |
#else
|
563 |
abort(); |
564 |
#endif
|
565 |
} |
566 |
|
567 |
void qemu_notify_event(void) |
568 |
{ |
569 |
CPUState *env = cpu_single_env; |
570 |
|
571 |
qemu_event_increment (); |
572 |
if (env) {
|
573 |
cpu_exit(env); |
574 |
} |
575 |
if (next_cpu && env != next_cpu) {
|
576 |
cpu_exit(next_cpu); |
577 |
} |
578 |
exit_request = 1;
|
579 |
} |
580 |
|
581 |
void qemu_mutex_lock_iothread(void) {} |
582 |
void qemu_mutex_unlock_iothread(void) {} |
583 |
|
584 |
void cpu_stop_current(void) |
585 |
{ |
586 |
} |
587 |
|
588 |
void vm_stop(int reason) |
589 |
{ |
590 |
do_vm_stop(reason); |
591 |
} |
592 |
|
593 |
#else /* CONFIG_IOTHREAD */ |
594 |
|
595 |
#include "qemu-thread.h" |
596 |
|
597 |
QemuMutex qemu_global_mutex; |
598 |
static QemuMutex qemu_fair_mutex;
|
599 |
|
600 |
static QemuThread io_thread;
|
601 |
|
602 |
static QemuThread *tcg_cpu_thread;
|
603 |
static QemuCond *tcg_halt_cond;
|
604 |
|
605 |
static int qemu_system_ready; |
606 |
/* cpu creation */
|
607 |
static QemuCond qemu_cpu_cond;
|
608 |
/* system init */
|
609 |
static QemuCond qemu_system_cond;
|
610 |
static QemuCond qemu_pause_cond;
|
611 |
static QemuCond qemu_work_cond;
|
612 |
|
613 |
static void cpu_signal(int sig) |
614 |
{ |
615 |
if (cpu_single_env) {
|
616 |
cpu_exit(cpu_single_env); |
617 |
} |
618 |
exit_request = 1;
|
619 |
} |
620 |
|
621 |
static void qemu_kvm_init_cpu_signals(CPUState *env) |
622 |
{ |
623 |
int r;
|
624 |
sigset_t set; |
625 |
struct sigaction sigact;
|
626 |
|
627 |
memset(&sigact, 0, sizeof(sigact)); |
628 |
sigact.sa_handler = dummy_signal; |
629 |
sigaction(SIG_IPI, &sigact, NULL);
|
630 |
|
631 |
pthread_sigmask(SIG_BLOCK, NULL, &set);
|
632 |
sigdelset(&set, SIG_IPI); |
633 |
sigdelset(&set, SIGBUS); |
634 |
r = kvm_set_signal_mask(env, &set); |
635 |
if (r) {
|
636 |
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
|
637 |
exit(1);
|
638 |
} |
639 |
} |
640 |
|
641 |
static void qemu_tcg_init_cpu_signals(void) |
642 |
{ |
643 |
sigset_t set; |
644 |
struct sigaction sigact;
|
645 |
|
646 |
memset(&sigact, 0, sizeof(sigact)); |
647 |
sigact.sa_handler = cpu_signal; |
648 |
sigaction(SIG_IPI, &sigact, NULL);
|
649 |
|
650 |
sigemptyset(&set); |
651 |
sigaddset(&set, SIG_IPI); |
652 |
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
|
653 |
} |
654 |
|
655 |
static sigset_t block_io_signals(void) |
656 |
{ |
657 |
sigset_t set; |
658 |
|
659 |
/* SIGUSR2 used by posix-aio-compat.c */
|
660 |
sigemptyset(&set); |
661 |
sigaddset(&set, SIGUSR2); |
662 |
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
|
663 |
|
664 |
sigemptyset(&set); |
665 |
sigaddset(&set, SIGIO); |
666 |
sigaddset(&set, SIGALRM); |
667 |
sigaddset(&set, SIG_IPI); |
668 |
sigaddset(&set, SIGBUS); |
669 |
pthread_sigmask(SIG_BLOCK, &set, NULL);
|
670 |
|
671 |
return set;
|
672 |
} |
673 |
|
674 |
int qemu_init_main_loop(void) |
675 |
{ |
676 |
int ret;
|
677 |
sigset_t blocked_signals; |
678 |
|
679 |
qemu_init_sigbus(); |
680 |
|
681 |
blocked_signals = block_io_signals(); |
682 |
|
683 |
ret = qemu_signalfd_init(blocked_signals); |
684 |
if (ret) {
|
685 |
return ret;
|
686 |
} |
687 |
|
688 |
/* Note eventfd must be drained before signalfd handlers run */
|
689 |
ret = qemu_event_init(); |
690 |
if (ret) {
|
691 |
return ret;
|
692 |
} |
693 |
|
694 |
qemu_cond_init(&qemu_cpu_cond); |
695 |
qemu_cond_init(&qemu_system_cond); |
696 |
qemu_cond_init(&qemu_pause_cond); |
697 |
qemu_cond_init(&qemu_work_cond); |
698 |
qemu_mutex_init(&qemu_fair_mutex); |
699 |
qemu_mutex_init(&qemu_global_mutex); |
700 |
qemu_mutex_lock(&qemu_global_mutex); |
701 |
|
702 |
qemu_thread_get_self(&io_thread); |
703 |
|
704 |
return 0; |
705 |
} |
706 |
|
707 |
void qemu_main_loop_start(void) |
708 |
{ |
709 |
qemu_system_ready = 1;
|
710 |
qemu_cond_broadcast(&qemu_system_cond); |
711 |
} |
712 |
|
713 |
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data) |
714 |
{ |
715 |
struct qemu_work_item wi;
|
716 |
|
717 |
if (qemu_cpu_is_self(env)) {
|
718 |
func(data); |
719 |
return;
|
720 |
} |
721 |
|
722 |
wi.func = func; |
723 |
wi.data = data; |
724 |
if (!env->queued_work_first) {
|
725 |
env->queued_work_first = &wi; |
726 |
} else {
|
727 |
env->queued_work_last->next = &wi; |
728 |
} |
729 |
env->queued_work_last = &wi; |
730 |
wi.next = NULL;
|
731 |
wi.done = false;
|
732 |
|
733 |
qemu_cpu_kick(env); |
734 |
while (!wi.done) {
|
735 |
CPUState *self_env = cpu_single_env; |
736 |
|
737 |
qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex); |
738 |
cpu_single_env = self_env; |
739 |
} |
740 |
} |
741 |
|
742 |
static void flush_queued_work(CPUState *env) |
743 |
{ |
744 |
struct qemu_work_item *wi;
|
745 |
|
746 |
if (!env->queued_work_first) {
|
747 |
return;
|
748 |
} |
749 |
|
750 |
while ((wi = env->queued_work_first)) {
|
751 |
env->queued_work_first = wi->next; |
752 |
wi->func(wi->data); |
753 |
wi->done = true;
|
754 |
} |
755 |
env->queued_work_last = NULL;
|
756 |
qemu_cond_broadcast(&qemu_work_cond); |
757 |
} |
758 |
|
759 |
static void qemu_wait_io_event_common(CPUState *env) |
760 |
{ |
761 |
if (env->stop) {
|
762 |
env->stop = 0;
|
763 |
env->stopped = 1;
|
764 |
qemu_cond_signal(&qemu_pause_cond); |
765 |
} |
766 |
flush_queued_work(env); |
767 |
env->thread_kicked = false;
|
768 |
} |
769 |
|
770 |
static void qemu_tcg_wait_io_event(void) |
771 |
{ |
772 |
CPUState *env; |
773 |
|
774 |
while (all_cpu_threads_idle()) {
|
775 |
qemu_cond_timedwait(tcg_halt_cond, &qemu_global_mutex, 1000);
|
776 |
} |
777 |
|
778 |
qemu_mutex_unlock(&qemu_global_mutex); |
779 |
|
780 |
/*
|
781 |
* Users of qemu_global_mutex can be starved, having no chance
|
782 |
* to acquire it since this path will get to it first.
|
783 |
* So use another lock to provide fairness.
|
784 |
*/
|
785 |
qemu_mutex_lock(&qemu_fair_mutex); |
786 |
qemu_mutex_unlock(&qemu_fair_mutex); |
787 |
|
788 |
qemu_mutex_lock(&qemu_global_mutex); |
789 |
|
790 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
791 |
qemu_wait_io_event_common(env); |
792 |
} |
793 |
} |
794 |
|
795 |
static void qemu_kvm_wait_io_event(CPUState *env) |
796 |
{ |
797 |
while (cpu_thread_is_idle(env)) {
|
798 |
qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000);
|
799 |
} |
800 |
|
801 |
qemu_kvm_eat_signals(env); |
802 |
qemu_wait_io_event_common(env); |
803 |
} |
804 |
|
805 |
static void *qemu_kvm_cpu_thread_fn(void *arg) |
806 |
{ |
807 |
CPUState *env = arg; |
808 |
int r;
|
809 |
|
810 |
qemu_mutex_lock(&qemu_global_mutex); |
811 |
qemu_thread_get_self(env->thread); |
812 |
|
813 |
r = kvm_init_vcpu(env); |
814 |
if (r < 0) { |
815 |
fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
|
816 |
exit(1);
|
817 |
} |
818 |
|
819 |
qemu_kvm_init_cpu_signals(env); |
820 |
|
821 |
/* signal CPU creation */
|
822 |
env->created = 1;
|
823 |
qemu_cond_signal(&qemu_cpu_cond); |
824 |
|
825 |
/* and wait for machine initialization */
|
826 |
while (!qemu_system_ready) {
|
827 |
qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
|
828 |
} |
829 |
|
830 |
while (1) { |
831 |
if (cpu_can_run(env)) {
|
832 |
r = kvm_cpu_exec(env); |
833 |
if (r == EXCP_DEBUG) {
|
834 |
cpu_handle_debug_exception(env); |
835 |
} |
836 |
} |
837 |
qemu_kvm_wait_io_event(env); |
838 |
} |
839 |
|
840 |
return NULL; |
841 |
} |
842 |
|
843 |
static void *qemu_tcg_cpu_thread_fn(void *arg) |
844 |
{ |
845 |
CPUState *env = arg; |
846 |
|
847 |
qemu_tcg_init_cpu_signals(); |
848 |
qemu_thread_get_self(env->thread); |
849 |
|
850 |
/* signal CPU creation */
|
851 |
qemu_mutex_lock(&qemu_global_mutex); |
852 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
853 |
env->created = 1;
|
854 |
} |
855 |
qemu_cond_signal(&qemu_cpu_cond); |
856 |
|
857 |
/* and wait for machine initialization */
|
858 |
while (!qemu_system_ready) {
|
859 |
qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
|
860 |
} |
861 |
|
862 |
while (1) { |
863 |
cpu_exec_all(); |
864 |
qemu_tcg_wait_io_event(); |
865 |
} |
866 |
|
867 |
return NULL; |
868 |
} |
869 |
|
870 |
void qemu_cpu_kick(void *_env) |
871 |
{ |
872 |
CPUState *env = _env; |
873 |
|
874 |
qemu_cond_broadcast(env->halt_cond); |
875 |
if (!env->thread_kicked) {
|
876 |
qemu_thread_signal(env->thread, SIG_IPI); |
877 |
env->thread_kicked = true;
|
878 |
} |
879 |
} |
880 |
|
881 |
void qemu_cpu_kick_self(void) |
882 |
{ |
883 |
assert(cpu_single_env); |
884 |
|
885 |
if (!cpu_single_env->thread_kicked) {
|
886 |
qemu_thread_signal(cpu_single_env->thread, SIG_IPI); |
887 |
cpu_single_env->thread_kicked = true;
|
888 |
} |
889 |
} |
890 |
|
891 |
int qemu_cpu_is_self(void *_env) |
892 |
{ |
893 |
CPUState *env = _env; |
894 |
|
895 |
return qemu_thread_is_self(env->thread);
|
896 |
} |
897 |
|
898 |
void qemu_mutex_lock_iothread(void) |
899 |
{ |
900 |
if (kvm_enabled()) {
|
901 |
qemu_mutex_lock(&qemu_global_mutex); |
902 |
} else {
|
903 |
qemu_mutex_lock(&qemu_fair_mutex); |
904 |
if (qemu_mutex_trylock(&qemu_global_mutex)) {
|
905 |
qemu_thread_signal(tcg_cpu_thread, SIG_IPI); |
906 |
qemu_mutex_lock(&qemu_global_mutex); |
907 |
} |
908 |
qemu_mutex_unlock(&qemu_fair_mutex); |
909 |
} |
910 |
} |
911 |
|
912 |
void qemu_mutex_unlock_iothread(void) |
913 |
{ |
914 |
qemu_mutex_unlock(&qemu_global_mutex); |
915 |
} |
916 |
|
917 |
static int all_vcpus_paused(void) |
918 |
{ |
919 |
CPUState *penv = first_cpu; |
920 |
|
921 |
while (penv) {
|
922 |
if (!penv->stopped) {
|
923 |
return 0; |
924 |
} |
925 |
penv = (CPUState *)penv->next_cpu; |
926 |
} |
927 |
|
928 |
return 1; |
929 |
} |
930 |
|
931 |
void pause_all_vcpus(void) |
932 |
{ |
933 |
CPUState *penv = first_cpu; |
934 |
|
935 |
while (penv) {
|
936 |
penv->stop = 1;
|
937 |
qemu_cpu_kick(penv); |
938 |
penv = (CPUState *)penv->next_cpu; |
939 |
} |
940 |
|
941 |
while (!all_vcpus_paused()) {
|
942 |
qemu_cond_timedwait(&qemu_pause_cond, &qemu_global_mutex, 100);
|
943 |
penv = first_cpu; |
944 |
while (penv) {
|
945 |
qemu_cpu_kick(penv); |
946 |
penv = (CPUState *)penv->next_cpu; |
947 |
} |
948 |
} |
949 |
} |
950 |
|
951 |
void resume_all_vcpus(void) |
952 |
{ |
953 |
CPUState *penv = first_cpu; |
954 |
|
955 |
while (penv) {
|
956 |
penv->stop = 0;
|
957 |
penv->stopped = 0;
|
958 |
qemu_cpu_kick(penv); |
959 |
penv = (CPUState *)penv->next_cpu; |
960 |
} |
961 |
} |
962 |
|
963 |
static void qemu_tcg_init_vcpu(void *_env) |
964 |
{ |
965 |
CPUState *env = _env; |
966 |
|
967 |
/* share a single thread for all cpus with TCG */
|
968 |
if (!tcg_cpu_thread) {
|
969 |
env->thread = qemu_mallocz(sizeof(QemuThread));
|
970 |
env->halt_cond = qemu_mallocz(sizeof(QemuCond));
|
971 |
qemu_cond_init(env->halt_cond); |
972 |
qemu_thread_create(env->thread, qemu_tcg_cpu_thread_fn, env); |
973 |
while (env->created == 0) { |
974 |
qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
|
975 |
} |
976 |
tcg_cpu_thread = env->thread; |
977 |
tcg_halt_cond = env->halt_cond; |
978 |
} else {
|
979 |
env->thread = tcg_cpu_thread; |
980 |
env->halt_cond = tcg_halt_cond; |
981 |
} |
982 |
} |
983 |
|
984 |
static void qemu_kvm_start_vcpu(CPUState *env) |
985 |
{ |
986 |
env->thread = qemu_mallocz(sizeof(QemuThread));
|
987 |
env->halt_cond = qemu_mallocz(sizeof(QemuCond));
|
988 |
qemu_cond_init(env->halt_cond); |
989 |
qemu_thread_create(env->thread, qemu_kvm_cpu_thread_fn, env); |
990 |
while (env->created == 0) { |
991 |
qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
|
992 |
} |
993 |
} |
994 |
|
995 |
void qemu_init_vcpu(void *_env) |
996 |
{ |
997 |
CPUState *env = _env; |
998 |
|
999 |
env->nr_cores = smp_cores; |
1000 |
env->nr_threads = smp_threads; |
1001 |
if (kvm_enabled()) {
|
1002 |
qemu_kvm_start_vcpu(env); |
1003 |
} else {
|
1004 |
qemu_tcg_init_vcpu(env); |
1005 |
} |
1006 |
} |
1007 |
|
1008 |
void qemu_notify_event(void) |
1009 |
{ |
1010 |
qemu_event_increment(); |
1011 |
} |
1012 |
|
1013 |
void cpu_stop_current(void) |
1014 |
{ |
1015 |
if (cpu_single_env) {
|
1016 |
cpu_single_env->stopped = 1;
|
1017 |
cpu_exit(cpu_single_env); |
1018 |
} |
1019 |
} |
1020 |
|
1021 |
void vm_stop(int reason) |
1022 |
{ |
1023 |
if (!qemu_thread_is_self(&io_thread)) {
|
1024 |
qemu_system_vmstop_request(reason); |
1025 |
/*
|
1026 |
* FIXME: should not return to device code in case
|
1027 |
* vm_stop() has been requested.
|
1028 |
*/
|
1029 |
cpu_stop_current(); |
1030 |
return;
|
1031 |
} |
1032 |
do_vm_stop(reason); |
1033 |
} |
1034 |
|
1035 |
#endif
|
1036 |
|
1037 |
static int tcg_cpu_exec(CPUState *env) |
1038 |
{ |
1039 |
int ret;
|
1040 |
#ifdef CONFIG_PROFILER
|
1041 |
int64_t ti; |
1042 |
#endif
|
1043 |
|
1044 |
#ifdef CONFIG_PROFILER
|
1045 |
ti = profile_getclock(); |
1046 |
#endif
|
1047 |
if (use_icount) {
|
1048 |
int64_t count; |
1049 |
int decr;
|
1050 |
qemu_icount -= (env->icount_decr.u16.low + env->icount_extra); |
1051 |
env->icount_decr.u16.low = 0;
|
1052 |
env->icount_extra = 0;
|
1053 |
count = qemu_icount_round (qemu_next_deadline()); |
1054 |
qemu_icount += count; |
1055 |
decr = (count > 0xffff) ? 0xffff : count; |
1056 |
count -= decr; |
1057 |
env->icount_decr.u16.low = decr; |
1058 |
env->icount_extra = count; |
1059 |
} |
1060 |
ret = cpu_exec(env); |
1061 |
#ifdef CONFIG_PROFILER
|
1062 |
qemu_time += profile_getclock() - ti; |
1063 |
#endif
|
1064 |
if (use_icount) {
|
1065 |
/* Fold pending instructions back into the
|
1066 |
instruction counter, and clear the interrupt flag. */
|
1067 |
qemu_icount -= (env->icount_decr.u16.low |
1068 |
+ env->icount_extra); |
1069 |
env->icount_decr.u32 = 0;
|
1070 |
env->icount_extra = 0;
|
1071 |
} |
1072 |
return ret;
|
1073 |
} |
1074 |
|
1075 |
bool cpu_exec_all(void) |
1076 |
{ |
1077 |
int r;
|
1078 |
|
1079 |
if (next_cpu == NULL) { |
1080 |
next_cpu = first_cpu; |
1081 |
} |
1082 |
for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) { |
1083 |
CPUState *env = next_cpu; |
1084 |
|
1085 |
qemu_clock_enable(vm_clock, |
1086 |
(env->singlestep_enabled & SSTEP_NOTIMER) == 0);
|
1087 |
|
1088 |
if (qemu_alarm_pending()) {
|
1089 |
break;
|
1090 |
} |
1091 |
if (cpu_can_run(env)) {
|
1092 |
if (kvm_enabled()) {
|
1093 |
r = kvm_cpu_exec(env); |
1094 |
qemu_kvm_eat_signals(env); |
1095 |
} else {
|
1096 |
r = tcg_cpu_exec(env); |
1097 |
} |
1098 |
if (r == EXCP_DEBUG) {
|
1099 |
cpu_handle_debug_exception(env); |
1100 |
break;
|
1101 |
} |
1102 |
} else if (env->stop) { |
1103 |
break;
|
1104 |
} |
1105 |
} |
1106 |
exit_request = 0;
|
1107 |
return !all_cpu_threads_idle();
|
1108 |
} |
1109 |
|
1110 |
void set_numa_modes(void) |
1111 |
{ |
1112 |
CPUState *env; |
1113 |
int i;
|
1114 |
|
1115 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
1116 |
for (i = 0; i < nb_numa_nodes; i++) { |
1117 |
if (node_cpumask[i] & (1 << env->cpu_index)) { |
1118 |
env->numa_node = i; |
1119 |
} |
1120 |
} |
1121 |
} |
1122 |
} |
1123 |
|
1124 |
void set_cpu_log(const char *optarg) |
1125 |
{ |
1126 |
int mask;
|
1127 |
const CPULogItem *item;
|
1128 |
|
1129 |
mask = cpu_str_to_log_mask(optarg); |
1130 |
if (!mask) {
|
1131 |
printf("Log items (comma separated):\n");
|
1132 |
for (item = cpu_log_items; item->mask != 0; item++) { |
1133 |
printf("%-10s %s\n", item->name, item->help);
|
1134 |
} |
1135 |
exit(1);
|
1136 |
} |
1137 |
cpu_set_log(mask); |
1138 |
} |
1139 |
|
1140 |
/* Return the virtual CPU time, based on the instruction counter. */
|
1141 |
int64_t cpu_get_icount(void)
|
1142 |
{ |
1143 |
int64_t icount; |
1144 |
CPUState *env = cpu_single_env;; |
1145 |
|
1146 |
icount = qemu_icount; |
1147 |
if (env) {
|
1148 |
if (!can_do_io(env)) {
|
1149 |
fprintf(stderr, "Bad clock read\n");
|
1150 |
} |
1151 |
icount -= (env->icount_decr.u16.low + env->icount_extra); |
1152 |
} |
1153 |
return qemu_icount_bias + (icount << icount_time_shift);
|
1154 |
} |
1155 |
|
1156 |
void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) |
1157 |
{ |
1158 |
/* XXX: implement xxx_cpu_list for targets that still miss it */
|
1159 |
#if defined(cpu_list_id)
|
1160 |
cpu_list_id(f, cpu_fprintf, optarg); |
1161 |
#elif defined(cpu_list)
|
1162 |
cpu_list(f, cpu_fprintf); /* deprecated */
|
1163 |
#endif
|
1164 |
} |