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 | #include "qemu/osdep.h" |
26 | #include "qemu-common.h" |
27 | #include "qemu/config-file.h" |
28 | #include "migration/vmstate.h" |
29 | #include "monitor/monitor.h" |
30 | #include "qapi/error.h" |
31 | #include "qapi/qapi-commands-misc.h" |
32 | #include "qapi/qapi-events-run-state.h" |
33 | #include "qapi/qmp/qerror.h" |
34 | #include "qemu/error-report.h" |
35 | #include "qemu/qemu-print.h" |
36 | #include "sysemu/tcg.h" |
37 | #include "sysemu/block-backend.h" |
38 | #include "exec/gdbstub.h" |
39 | #include "sysemu/dma.h" |
40 | #include "sysemu/hw_accel.h" |
41 | #include "sysemu/kvm.h" |
42 | #include "sysemu/hax.h" |
43 | #include "sysemu/hvf.h" |
44 | #include "sysemu/whpx.h" |
45 | #include "exec/exec-all.h" |
46 | |
47 | #include "qemu/thread.h" |
48 | #include "sysemu/cpus.h" |
49 | #include "sysemu/qtest.h" |
50 | #include "qemu/main-loop.h" |
51 | #include "qemu/option.h" |
52 | #include "qemu/bitmap.h" |
53 | #include "qemu/seqlock.h" |
54 | #include "qemu/guest-random.h" |
55 | #include "tcg.h" |
56 | #include "hw/nmi.h" |
57 | #include "sysemu/replay.h" |
58 | #include "sysemu/runstate.h" |
59 | #include "hw/boards.h" |
60 | #include "hw/hw.h" |
61 | |
62 | #ifdef CONFIG_LINUX |
63 | |
64 | #include <sys/prctl.h> |
65 | |
66 | #ifndef PR_MCE_KILL |
67 | #define PR_MCE_KILL 33 |
68 | #endif |
69 | |
70 | #ifndef PR_MCE_KILL_SET |
71 | #define PR_MCE_KILL_SET 1 |
72 | #endif |
73 | |
74 | #ifndef PR_MCE_KILL_EARLY |
75 | #define PR_MCE_KILL_EARLY 1 |
76 | #endif |
77 | |
78 | #endif /* CONFIG_LINUX */ |
79 | |
80 | int64_t max_delay; |
81 | int64_t max_advance; |
82 | |
83 | /* vcpu throttling controls */ |
84 | static QEMUTimer *throttle_timer; |
85 | static unsigned int throttle_percentage; |
86 | |
87 | #define CPU_THROTTLE_PCT_MIN 1 |
88 | #define CPU_THROTTLE_PCT_MAX 99 |
89 | #define CPU_THROTTLE_TIMESLICE_NS 10000000 |
90 | |
91 | bool cpu_is_stopped(CPUState *cpu) |
92 | { |
93 | return cpu->stopped || !runstate_is_running(); |
94 | } |
95 | |
96 | static bool cpu_thread_is_idle(CPUState *cpu) |
97 | { |
98 | if (cpu->stop || cpu->queued_work_first) { |
99 | return false; |
100 | } |
101 | if (cpu_is_stopped(cpu)) { |
102 | return true; |
103 | } |
104 | if (!cpu->halted || cpu_has_work(cpu) || |
105 | kvm_halt_in_kernel()) { |
106 | return false; |
107 | } |
108 | return true; |
109 | } |
110 | |
111 | static bool all_cpu_threads_idle(void) |
112 | { |
113 | CPUState *cpu; |
114 | |
115 | CPU_FOREACH(cpu) { |
116 | if (!cpu_thread_is_idle(cpu)) { |
117 | return false; |
118 | } |
119 | } |
120 | return true; |
121 | } |
122 | |
123 | /***********************************************************/ |
124 | /* guest cycle counter */ |
125 | |
126 | /* Protected by TimersState seqlock */ |
127 | |
128 | static bool icount_sleep = true; |
129 | /* Arbitrarily pick 1MIPS as the minimum allowable speed. */ |
130 | #define MAX_ICOUNT_SHIFT 10 |
131 | |
132 | typedef struct { |
133 | /* Protected by BQL. */ |
134 | int64_t ; |
135 | int64_t ; |
136 | |
137 | /* Protect fields that can be respectively read outside the |
138 | * BQL, and written from multiple threads. |
139 | */ |
140 | QemuSeqLock ; |
141 | QemuSpin ; |
142 | |
143 | int16_t ; |
144 | |
145 | /* Conversion factor from emulated instructions to virtual clock ticks. */ |
146 | int16_t ; |
147 | |
148 | /* Compensate for varying guest execution speed. */ |
149 | int64_t ; |
150 | |
151 | int64_t ; |
152 | int64_t ; |
153 | |
154 | /* Only written by TCG thread */ |
155 | int64_t ; |
156 | |
157 | /* for adjusting icount */ |
158 | QEMUTimer *; |
159 | QEMUTimer *; |
160 | QEMUTimer *; |
161 | } ; |
162 | |
163 | static TimersState timers_state; |
164 | bool mttcg_enabled; |
165 | |
166 | /* |
167 | * We default to false if we know other options have been enabled |
168 | * which are currently incompatible with MTTCG. Otherwise when each |
169 | * guest (target) has been updated to support: |
170 | * - atomic instructions |
171 | * - memory ordering primitives (barriers) |
172 | * they can set the appropriate CONFIG flags in ${target}-softmmu.mak |
173 | * |
174 | * Once a guest architecture has been converted to the new primitives |
175 | * there are two remaining limitations to check. |
176 | * |
177 | * - The guest can't be oversized (e.g. 64 bit guest on 32 bit host) |
178 | * - The host must have a stronger memory order than the guest |
179 | * |
180 | * It may be possible in future to support strong guests on weak hosts |
181 | * but that will require tagging all load/stores in a guest with their |
182 | * implicit memory order requirements which would likely slow things |
183 | * down a lot. |
184 | */ |
185 | |
186 | static bool check_tcg_memory_orders_compatible(void) |
187 | { |
188 | #if defined(TCG_GUEST_DEFAULT_MO) && defined(TCG_TARGET_DEFAULT_MO) |
189 | return (TCG_GUEST_DEFAULT_MO & ~TCG_TARGET_DEFAULT_MO) == 0; |
190 | #else |
191 | return false; |
192 | #endif |
193 | } |
194 | |
195 | static bool default_mttcg_enabled(void) |
196 | { |
197 | if (use_icount || TCG_OVERSIZED_GUEST) { |
198 | return false; |
199 | } else { |
200 | #ifdef TARGET_SUPPORTS_MTTCG |
201 | return check_tcg_memory_orders_compatible(); |
202 | #else |
203 | return false; |
204 | #endif |
205 | } |
206 | } |
207 | |
208 | void qemu_tcg_configure(QemuOpts *opts, Error **errp) |
209 | { |
210 | const char *t = qemu_opt_get(opts, "thread" ); |
211 | if (t) { |
212 | if (strcmp(t, "multi" ) == 0) { |
213 | if (TCG_OVERSIZED_GUEST) { |
214 | error_setg(errp, "No MTTCG when guest word size > hosts" ); |
215 | } else if (use_icount) { |
216 | error_setg(errp, "No MTTCG when icount is enabled" ); |
217 | } else { |
218 | #ifndef TARGET_SUPPORTS_MTTCG |
219 | warn_report("Guest not yet converted to MTTCG - " |
220 | "you may get unexpected results" ); |
221 | #endif |
222 | if (!check_tcg_memory_orders_compatible()) { |
223 | warn_report("Guest expects a stronger memory ordering " |
224 | "than the host provides" ); |
225 | error_printf("This may cause strange/hard to debug errors\n" ); |
226 | } |
227 | mttcg_enabled = true; |
228 | } |
229 | } else if (strcmp(t, "single" ) == 0) { |
230 | mttcg_enabled = false; |
231 | } else { |
232 | error_setg(errp, "Invalid 'thread' setting %s" , t); |
233 | } |
234 | } else { |
235 | mttcg_enabled = default_mttcg_enabled(); |
236 | } |
237 | } |
238 | |
239 | /* The current number of executed instructions is based on what we |
240 | * originally budgeted minus the current state of the decrementing |
241 | * icount counters in extra/u16.low. |
242 | */ |
243 | static int64_t cpu_get_icount_executed(CPUState *cpu) |
244 | { |
245 | return (cpu->icount_budget - |
246 | (cpu_neg(cpu)->icount_decr.u16.low + cpu->icount_extra)); |
247 | } |
248 | |
249 | /* |
250 | * Update the global shared timer_state.qemu_icount to take into |
251 | * account executed instructions. This is done by the TCG vCPU |
252 | * thread so the main-loop can see time has moved forward. |
253 | */ |
254 | static void cpu_update_icount_locked(CPUState *cpu) |
255 | { |
256 | int64_t executed = cpu_get_icount_executed(cpu); |
257 | cpu->icount_budget -= executed; |
258 | |
259 | atomic_set_i64(&timers_state.qemu_icount, |
260 | timers_state.qemu_icount + executed); |
261 | } |
262 | |
263 | /* |
264 | * Update the global shared timer_state.qemu_icount to take into |
265 | * account executed instructions. This is done by the TCG vCPU |
266 | * thread so the main-loop can see time has moved forward. |
267 | */ |
268 | void cpu_update_icount(CPUState *cpu) |
269 | { |
270 | seqlock_write_lock(&timers_state.vm_clock_seqlock, |
271 | &timers_state.vm_clock_lock); |
272 | cpu_update_icount_locked(cpu); |
273 | seqlock_write_unlock(&timers_state.vm_clock_seqlock, |
274 | &timers_state.vm_clock_lock); |
275 | } |
276 | |
277 | static int64_t cpu_get_icount_raw_locked(void) |
278 | { |
279 | CPUState *cpu = current_cpu; |
280 | |
281 | if (cpu && cpu->running) { |
282 | if (!cpu->can_do_io) { |
283 | error_report("Bad icount read" ); |
284 | exit(1); |
285 | } |
286 | /* Take into account what has run */ |
287 | cpu_update_icount_locked(cpu); |
288 | } |
289 | /* The read is protected by the seqlock, but needs atomic64 to avoid UB */ |
290 | return atomic_read_i64(&timers_state.qemu_icount); |
291 | } |
292 | |
293 | static int64_t cpu_get_icount_locked(void) |
294 | { |
295 | int64_t icount = cpu_get_icount_raw_locked(); |
296 | return atomic_read_i64(&timers_state.qemu_icount_bias) + |
297 | cpu_icount_to_ns(icount); |
298 | } |
299 | |
300 | int64_t cpu_get_icount_raw(void) |
301 | { |
302 | int64_t icount; |
303 | unsigned start; |
304 | |
305 | do { |
306 | start = seqlock_read_begin(&timers_state.vm_clock_seqlock); |
307 | icount = cpu_get_icount_raw_locked(); |
308 | } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, start)); |
309 | |
310 | return icount; |
311 | } |
312 | |
313 | /* Return the virtual CPU time, based on the instruction counter. */ |
314 | int64_t cpu_get_icount(void) |
315 | { |
316 | int64_t icount; |
317 | unsigned start; |
318 | |
319 | do { |
320 | start = seqlock_read_begin(&timers_state.vm_clock_seqlock); |
321 | icount = cpu_get_icount_locked(); |
322 | } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, start)); |
323 | |
324 | return icount; |
325 | } |
326 | |
327 | int64_t cpu_icount_to_ns(int64_t icount) |
328 | { |
329 | return icount << atomic_read(&timers_state.icount_time_shift); |
330 | } |
331 | |
332 | static int64_t cpu_get_ticks_locked(void) |
333 | { |
334 | int64_t ticks = timers_state.cpu_ticks_offset; |
335 | if (timers_state.cpu_ticks_enabled) { |
336 | ticks += cpu_get_host_ticks(); |
337 | } |
338 | |
339 | if (timers_state.cpu_ticks_prev > ticks) { |
340 | /* Non increasing ticks may happen if the host uses software suspend. */ |
341 | timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks; |
342 | ticks = timers_state.cpu_ticks_prev; |
343 | } |
344 | |
345 | timers_state.cpu_ticks_prev = ticks; |
346 | return ticks; |
347 | } |
348 | |
349 | /* return the time elapsed in VM between vm_start and vm_stop. Unless |
350 | * icount is active, cpu_get_ticks() uses units of the host CPU cycle |
351 | * counter. |
352 | */ |
353 | int64_t cpu_get_ticks(void) |
354 | { |
355 | int64_t ticks; |
356 | |
357 | if (use_icount) { |
358 | return cpu_get_icount(); |
359 | } |
360 | |
361 | qemu_spin_lock(&timers_state.vm_clock_lock); |
362 | ticks = cpu_get_ticks_locked(); |
363 | qemu_spin_unlock(&timers_state.vm_clock_lock); |
364 | return ticks; |
365 | } |
366 | |
367 | static int64_t cpu_get_clock_locked(void) |
368 | { |
369 | int64_t time; |
370 | |
371 | time = timers_state.cpu_clock_offset; |
372 | if (timers_state.cpu_ticks_enabled) { |
373 | time += get_clock(); |
374 | } |
375 | |
376 | return time; |
377 | } |
378 | |
379 | /* Return the monotonic time elapsed in VM, i.e., |
380 | * the time between vm_start and vm_stop |
381 | */ |
382 | int64_t cpu_get_clock(void) |
383 | { |
384 | int64_t ti; |
385 | unsigned start; |
386 | |
387 | do { |
388 | start = seqlock_read_begin(&timers_state.vm_clock_seqlock); |
389 | ti = cpu_get_clock_locked(); |
390 | } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, start)); |
391 | |
392 | return ti; |
393 | } |
394 | |
395 | /* enable cpu_get_ticks() |
396 | * Caller must hold BQL which serves as mutex for vm_clock_seqlock. |
397 | */ |
398 | void cpu_enable_ticks(void) |
399 | { |
400 | seqlock_write_lock(&timers_state.vm_clock_seqlock, |
401 | &timers_state.vm_clock_lock); |
402 | if (!timers_state.cpu_ticks_enabled) { |
403 | timers_state.cpu_ticks_offset -= cpu_get_host_ticks(); |
404 | timers_state.cpu_clock_offset -= get_clock(); |
405 | timers_state.cpu_ticks_enabled = 1; |
406 | } |
407 | seqlock_write_unlock(&timers_state.vm_clock_seqlock, |
408 | &timers_state.vm_clock_lock); |
409 | } |
410 | |
411 | /* disable cpu_get_ticks() : the clock is stopped. You must not call |
412 | * cpu_get_ticks() after that. |
413 | * Caller must hold BQL which serves as mutex for vm_clock_seqlock. |
414 | */ |
415 | void cpu_disable_ticks(void) |
416 | { |
417 | seqlock_write_lock(&timers_state.vm_clock_seqlock, |
418 | &timers_state.vm_clock_lock); |
419 | if (timers_state.cpu_ticks_enabled) { |
420 | timers_state.cpu_ticks_offset += cpu_get_host_ticks(); |
421 | timers_state.cpu_clock_offset = cpu_get_clock_locked(); |
422 | timers_state.cpu_ticks_enabled = 0; |
423 | } |
424 | seqlock_write_unlock(&timers_state.vm_clock_seqlock, |
425 | &timers_state.vm_clock_lock); |
426 | } |
427 | |
428 | /* Correlation between real and virtual time is always going to be |
429 | fairly approximate, so ignore small variation. |
430 | When the guest is idle real and virtual time will be aligned in |
431 | the IO wait loop. */ |
432 | #define ICOUNT_WOBBLE (NANOSECONDS_PER_SECOND / 10) |
433 | |
434 | static void icount_adjust(void) |
435 | { |
436 | int64_t cur_time; |
437 | int64_t cur_icount; |
438 | int64_t delta; |
439 | |
440 | /* Protected by TimersState mutex. */ |
441 | static int64_t last_delta; |
442 | |
443 | /* If the VM is not running, then do nothing. */ |
444 | if (!runstate_is_running()) { |
445 | return; |
446 | } |
447 | |
448 | seqlock_write_lock(&timers_state.vm_clock_seqlock, |
449 | &timers_state.vm_clock_lock); |
450 | cur_time = cpu_get_clock_locked(); |
451 | cur_icount = cpu_get_icount_locked(); |
452 | |
453 | delta = cur_icount - cur_time; |
454 | /* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */ |
455 | if (delta > 0 |
456 | && last_delta + ICOUNT_WOBBLE < delta * 2 |
457 | && timers_state.icount_time_shift > 0) { |
458 | /* The guest is getting too far ahead. Slow time down. */ |
459 | atomic_set(&timers_state.icount_time_shift, |
460 | timers_state.icount_time_shift - 1); |
461 | } |
462 | if (delta < 0 |
463 | && last_delta - ICOUNT_WOBBLE > delta * 2 |
464 | && timers_state.icount_time_shift < MAX_ICOUNT_SHIFT) { |
465 | /* The guest is getting too far behind. Speed time up. */ |
466 | atomic_set(&timers_state.icount_time_shift, |
467 | timers_state.icount_time_shift + 1); |
468 | } |
469 | last_delta = delta; |
470 | atomic_set_i64(&timers_state.qemu_icount_bias, |
471 | cur_icount - (timers_state.qemu_icount |
472 | << timers_state.icount_time_shift)); |
473 | seqlock_write_unlock(&timers_state.vm_clock_seqlock, |
474 | &timers_state.vm_clock_lock); |
475 | } |
476 | |
477 | static void icount_adjust_rt(void *opaque) |
478 | { |
479 | timer_mod(timers_state.icount_rt_timer, |
480 | qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL_RT) + 1000); |
481 | icount_adjust(); |
482 | } |
483 | |
484 | static void icount_adjust_vm(void *opaque) |
485 | { |
486 | timer_mod(timers_state.icount_vm_timer, |
487 | qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + |
488 | NANOSECONDS_PER_SECOND / 10); |
489 | icount_adjust(); |
490 | } |
491 | |
492 | static int64_t qemu_icount_round(int64_t count) |
493 | { |
494 | int shift = atomic_read(&timers_state.icount_time_shift); |
495 | return (count + (1 << shift) - 1) >> shift; |
496 | } |
497 | |
498 | static void icount_warp_rt(void) |
499 | { |
500 | unsigned seq; |
501 | int64_t warp_start; |
502 | |
503 | /* The icount_warp_timer is rescheduled soon after vm_clock_warp_start |
504 | * changes from -1 to another value, so the race here is okay. |
505 | */ |
506 | do { |
507 | seq = seqlock_read_begin(&timers_state.vm_clock_seqlock); |
508 | warp_start = timers_state.vm_clock_warp_start; |
509 | } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, seq)); |
510 | |
511 | if (warp_start == -1) { |
512 | return; |
513 | } |
514 | |
515 | seqlock_write_lock(&timers_state.vm_clock_seqlock, |
516 | &timers_state.vm_clock_lock); |
517 | if (runstate_is_running()) { |
518 | int64_t clock = REPLAY_CLOCK_LOCKED(REPLAY_CLOCK_VIRTUAL_RT, |
519 | cpu_get_clock_locked()); |
520 | int64_t warp_delta; |
521 | |
522 | warp_delta = clock - timers_state.vm_clock_warp_start; |
523 | if (use_icount == 2) { |
524 | /* |
525 | * In adaptive mode, do not let QEMU_CLOCK_VIRTUAL run too |
526 | * far ahead of real time. |
527 | */ |
528 | int64_t cur_icount = cpu_get_icount_locked(); |
529 | int64_t delta = clock - cur_icount; |
530 | warp_delta = MIN(warp_delta, delta); |
531 | } |
532 | atomic_set_i64(&timers_state.qemu_icount_bias, |
533 | timers_state.qemu_icount_bias + warp_delta); |
534 | } |
535 | timers_state.vm_clock_warp_start = -1; |
536 | seqlock_write_unlock(&timers_state.vm_clock_seqlock, |
537 | &timers_state.vm_clock_lock); |
538 | |
539 | if (qemu_clock_expired(QEMU_CLOCK_VIRTUAL)) { |
540 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); |
541 | } |
542 | } |
543 | |
544 | static void icount_timer_cb(void *opaque) |
545 | { |
546 | /* No need for a checkpoint because the timer already synchronizes |
547 | * with CHECKPOINT_CLOCK_VIRTUAL_RT. |
548 | */ |
549 | icount_warp_rt(); |
550 | } |
551 | |
552 | void qtest_clock_warp(int64_t dest) |
553 | { |
554 | int64_t clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); |
555 | AioContext *aio_context; |
556 | assert(qtest_enabled()); |
557 | aio_context = qemu_get_aio_context(); |
558 | while (clock < dest) { |
559 | int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL, |
560 | QEMU_TIMER_ATTR_ALL); |
561 | int64_t warp = qemu_soonest_timeout(dest - clock, deadline); |
562 | |
563 | seqlock_write_lock(&timers_state.vm_clock_seqlock, |
564 | &timers_state.vm_clock_lock); |
565 | atomic_set_i64(&timers_state.qemu_icount_bias, |
566 | timers_state.qemu_icount_bias + warp); |
567 | seqlock_write_unlock(&timers_state.vm_clock_seqlock, |
568 | &timers_state.vm_clock_lock); |
569 | |
570 | qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL); |
571 | timerlist_run_timers(aio_context->tlg.tl[QEMU_CLOCK_VIRTUAL]); |
572 | clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); |
573 | } |
574 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); |
575 | } |
576 | |
577 | void qemu_start_warp_timer(void) |
578 | { |
579 | int64_t clock; |
580 | int64_t deadline; |
581 | |
582 | if (!use_icount) { |
583 | return; |
584 | } |
585 | |
586 | /* Nothing to do if the VM is stopped: QEMU_CLOCK_VIRTUAL timers |
587 | * do not fire, so computing the deadline does not make sense. |
588 | */ |
589 | if (!runstate_is_running()) { |
590 | return; |
591 | } |
592 | |
593 | if (replay_mode != REPLAY_MODE_PLAY) { |
594 | if (!all_cpu_threads_idle()) { |
595 | return; |
596 | } |
597 | |
598 | if (qtest_enabled()) { |
599 | /* When testing, qtest commands advance icount. */ |
600 | return; |
601 | } |
602 | |
603 | replay_checkpoint(CHECKPOINT_CLOCK_WARP_START); |
604 | } else { |
605 | /* warp clock deterministically in record/replay mode */ |
606 | if (!replay_checkpoint(CHECKPOINT_CLOCK_WARP_START)) { |
607 | /* vCPU is sleeping and warp can't be started. |
608 | It is probably a race condition: notification sent |
609 | to vCPU was processed in advance and vCPU went to sleep. |
610 | Therefore we have to wake it up for doing someting. */ |
611 | if (replay_has_checkpoint()) { |
612 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); |
613 | } |
614 | return; |
615 | } |
616 | } |
617 | |
618 | /* We want to use the earliest deadline from ALL vm_clocks */ |
619 | clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT); |
620 | deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL, |
621 | ~QEMU_TIMER_ATTR_EXTERNAL); |
622 | if (deadline < 0) { |
623 | static bool notified; |
624 | if (!icount_sleep && !notified) { |
625 | warn_report("icount sleep disabled and no active timers" ); |
626 | notified = true; |
627 | } |
628 | return; |
629 | } |
630 | |
631 | if (deadline > 0) { |
632 | /* |
633 | * Ensure QEMU_CLOCK_VIRTUAL proceeds even when the virtual CPU goes to |
634 | * sleep. Otherwise, the CPU might be waiting for a future timer |
635 | * interrupt to wake it up, but the interrupt never comes because |
636 | * the vCPU isn't running any insns and thus doesn't advance the |
637 | * QEMU_CLOCK_VIRTUAL. |
638 | */ |
639 | if (!icount_sleep) { |
640 | /* |
641 | * We never let VCPUs sleep in no sleep icount mode. |
642 | * If there is a pending QEMU_CLOCK_VIRTUAL timer we just advance |
643 | * to the next QEMU_CLOCK_VIRTUAL event and notify it. |
644 | * It is useful when we want a deterministic execution time, |
645 | * isolated from host latencies. |
646 | */ |
647 | seqlock_write_lock(&timers_state.vm_clock_seqlock, |
648 | &timers_state.vm_clock_lock); |
649 | atomic_set_i64(&timers_state.qemu_icount_bias, |
650 | timers_state.qemu_icount_bias + deadline); |
651 | seqlock_write_unlock(&timers_state.vm_clock_seqlock, |
652 | &timers_state.vm_clock_lock); |
653 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); |
654 | } else { |
655 | /* |
656 | * We do stop VCPUs and only advance QEMU_CLOCK_VIRTUAL after some |
657 | * "real" time, (related to the time left until the next event) has |
658 | * passed. The QEMU_CLOCK_VIRTUAL_RT clock will do this. |
659 | * This avoids that the warps are visible externally; for example, |
660 | * you will not be sending network packets continuously instead of |
661 | * every 100ms. |
662 | */ |
663 | seqlock_write_lock(&timers_state.vm_clock_seqlock, |
664 | &timers_state.vm_clock_lock); |
665 | if (timers_state.vm_clock_warp_start == -1 |
666 | || timers_state.vm_clock_warp_start > clock) { |
667 | timers_state.vm_clock_warp_start = clock; |
668 | } |
669 | seqlock_write_unlock(&timers_state.vm_clock_seqlock, |
670 | &timers_state.vm_clock_lock); |
671 | timer_mod_anticipate(timers_state.icount_warp_timer, |
672 | clock + deadline); |
673 | } |
674 | } else if (deadline == 0) { |
675 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); |
676 | } |
677 | } |
678 | |
679 | static void qemu_account_warp_timer(void) |
680 | { |
681 | if (!use_icount || !icount_sleep) { |
682 | return; |
683 | } |
684 | |
685 | /* Nothing to do if the VM is stopped: QEMU_CLOCK_VIRTUAL timers |
686 | * do not fire, so computing the deadline does not make sense. |
687 | */ |
688 | if (!runstate_is_running()) { |
689 | return; |
690 | } |
691 | |
692 | /* warp clock deterministically in record/replay mode */ |
693 | if (!replay_checkpoint(CHECKPOINT_CLOCK_WARP_ACCOUNT)) { |
694 | return; |
695 | } |
696 | |
697 | timer_del(timers_state.icount_warp_timer); |
698 | icount_warp_rt(); |
699 | } |
700 | |
701 | static bool icount_state_needed(void *opaque) |
702 | { |
703 | return use_icount; |
704 | } |
705 | |
706 | static bool warp_timer_state_needed(void *opaque) |
707 | { |
708 | TimersState *s = opaque; |
709 | return s->icount_warp_timer != NULL; |
710 | } |
711 | |
712 | static bool adjust_timers_state_needed(void *opaque) |
713 | { |
714 | TimersState *s = opaque; |
715 | return s->icount_rt_timer != NULL; |
716 | } |
717 | |
718 | /* |
719 | * Subsection for warp timer migration is optional, because may not be created |
720 | */ |
721 | static const VMStateDescription icount_vmstate_warp_timer = { |
722 | .name = "timer/icount/warp_timer" , |
723 | .version_id = 1, |
724 | .minimum_version_id = 1, |
725 | .needed = warp_timer_state_needed, |
726 | .fields = (VMStateField[]) { |
727 | VMSTATE_INT64(vm_clock_warp_start, TimersState), |
728 | VMSTATE_TIMER_PTR(icount_warp_timer, TimersState), |
729 | VMSTATE_END_OF_LIST() |
730 | } |
731 | }; |
732 | |
733 | static const VMStateDescription icount_vmstate_adjust_timers = { |
734 | .name = "timer/icount/timers" , |
735 | .version_id = 1, |
736 | .minimum_version_id = 1, |
737 | .needed = adjust_timers_state_needed, |
738 | .fields = (VMStateField[]) { |
739 | VMSTATE_TIMER_PTR(icount_rt_timer, TimersState), |
740 | VMSTATE_TIMER_PTR(icount_vm_timer, TimersState), |
741 | VMSTATE_END_OF_LIST() |
742 | } |
743 | }; |
744 | |
745 | /* |
746 | * This is a subsection for icount migration. |
747 | */ |
748 | static const VMStateDescription icount_vmstate_timers = { |
749 | .name = "timer/icount" , |
750 | .version_id = 1, |
751 | .minimum_version_id = 1, |
752 | .needed = icount_state_needed, |
753 | .fields = (VMStateField[]) { |
754 | VMSTATE_INT64(qemu_icount_bias, TimersState), |
755 | VMSTATE_INT64(qemu_icount, TimersState), |
756 | VMSTATE_END_OF_LIST() |
757 | }, |
758 | .subsections = (const VMStateDescription*[]) { |
759 | &icount_vmstate_warp_timer, |
760 | &icount_vmstate_adjust_timers, |
761 | NULL |
762 | } |
763 | }; |
764 | |
765 | static const VMStateDescription vmstate_timers = { |
766 | .name = "timer" , |
767 | .version_id = 2, |
768 | .minimum_version_id = 1, |
769 | .fields = (VMStateField[]) { |
770 | VMSTATE_INT64(cpu_ticks_offset, TimersState), |
771 | VMSTATE_UNUSED(8), |
772 | VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2), |
773 | VMSTATE_END_OF_LIST() |
774 | }, |
775 | .subsections = (const VMStateDescription*[]) { |
776 | &icount_vmstate_timers, |
777 | NULL |
778 | } |
779 | }; |
780 | |
781 | static void cpu_throttle_thread(CPUState *cpu, run_on_cpu_data opaque) |
782 | { |
783 | double pct; |
784 | double throttle_ratio; |
785 | long sleeptime_ns; |
786 | |
787 | if (!cpu_throttle_get_percentage()) { |
788 | return; |
789 | } |
790 | |
791 | pct = (double)cpu_throttle_get_percentage()/100; |
792 | throttle_ratio = pct / (1 - pct); |
793 | sleeptime_ns = (long)(throttle_ratio * CPU_THROTTLE_TIMESLICE_NS); |
794 | |
795 | qemu_mutex_unlock_iothread(); |
796 | g_usleep(sleeptime_ns / 1000); /* Convert ns to us for usleep call */ |
797 | qemu_mutex_lock_iothread(); |
798 | atomic_set(&cpu->throttle_thread_scheduled, 0); |
799 | } |
800 | |
801 | static void cpu_throttle_timer_tick(void *opaque) |
802 | { |
803 | CPUState *cpu; |
804 | double pct; |
805 | |
806 | /* Stop the timer if needed */ |
807 | if (!cpu_throttle_get_percentage()) { |
808 | return; |
809 | } |
810 | CPU_FOREACH(cpu) { |
811 | if (!atomic_xchg(&cpu->throttle_thread_scheduled, 1)) { |
812 | async_run_on_cpu(cpu, cpu_throttle_thread, |
813 | RUN_ON_CPU_NULL); |
814 | } |
815 | } |
816 | |
817 | pct = (double)cpu_throttle_get_percentage()/100; |
818 | timer_mod(throttle_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT) + |
819 | CPU_THROTTLE_TIMESLICE_NS / (1-pct)); |
820 | } |
821 | |
822 | void cpu_throttle_set(int new_throttle_pct) |
823 | { |
824 | /* Ensure throttle percentage is within valid range */ |
825 | new_throttle_pct = MIN(new_throttle_pct, CPU_THROTTLE_PCT_MAX); |
826 | new_throttle_pct = MAX(new_throttle_pct, CPU_THROTTLE_PCT_MIN); |
827 | |
828 | atomic_set(&throttle_percentage, new_throttle_pct); |
829 | |
830 | timer_mod(throttle_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT) + |
831 | CPU_THROTTLE_TIMESLICE_NS); |
832 | } |
833 | |
834 | void cpu_throttle_stop(void) |
835 | { |
836 | atomic_set(&throttle_percentage, 0); |
837 | } |
838 | |
839 | bool cpu_throttle_active(void) |
840 | { |
841 | return (cpu_throttle_get_percentage() != 0); |
842 | } |
843 | |
844 | int cpu_throttle_get_percentage(void) |
845 | { |
846 | return atomic_read(&throttle_percentage); |
847 | } |
848 | |
849 | void cpu_ticks_init(void) |
850 | { |
851 | seqlock_init(&timers_state.vm_clock_seqlock); |
852 | qemu_spin_init(&timers_state.vm_clock_lock); |
853 | vmstate_register(NULL, 0, &vmstate_timers, &timers_state); |
854 | throttle_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT, |
855 | cpu_throttle_timer_tick, NULL); |
856 | } |
857 | |
858 | void configure_icount(QemuOpts *opts, Error **errp) |
859 | { |
860 | const char *option; |
861 | char *rem_str = NULL; |
862 | |
863 | option = qemu_opt_get(opts, "shift" ); |
864 | if (!option) { |
865 | if (qemu_opt_get(opts, "align" ) != NULL) { |
866 | error_setg(errp, "Please specify shift option when using align" ); |
867 | } |
868 | return; |
869 | } |
870 | |
871 | icount_sleep = qemu_opt_get_bool(opts, "sleep" , true); |
872 | if (icount_sleep) { |
873 | timers_state.icount_warp_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT, |
874 | icount_timer_cb, NULL); |
875 | } |
876 | |
877 | icount_align_option = qemu_opt_get_bool(opts, "align" , false); |
878 | |
879 | if (icount_align_option && !icount_sleep) { |
880 | error_setg(errp, "align=on and sleep=off are incompatible" ); |
881 | } |
882 | if (strcmp(option, "auto" ) != 0) { |
883 | errno = 0; |
884 | timers_state.icount_time_shift = strtol(option, &rem_str, 0); |
885 | if (errno != 0 || *rem_str != '\0' || !strlen(option)) { |
886 | error_setg(errp, "icount: Invalid shift value" ); |
887 | } |
888 | use_icount = 1; |
889 | return; |
890 | } else if (icount_align_option) { |
891 | error_setg(errp, "shift=auto and align=on are incompatible" ); |
892 | } else if (!icount_sleep) { |
893 | error_setg(errp, "shift=auto and sleep=off are incompatible" ); |
894 | } |
895 | |
896 | use_icount = 2; |
897 | |
898 | /* 125MIPS seems a reasonable initial guess at the guest speed. |
899 | It will be corrected fairly quickly anyway. */ |
900 | timers_state.icount_time_shift = 3; |
901 | |
902 | /* Have both realtime and virtual time triggers for speed adjustment. |
903 | The realtime trigger catches emulated time passing too slowly, |
904 | the virtual time trigger catches emulated time passing too fast. |
905 | Realtime triggers occur even when idle, so use them less frequently |
906 | than VM triggers. */ |
907 | timers_state.vm_clock_warp_start = -1; |
908 | timers_state.icount_rt_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL_RT, |
909 | icount_adjust_rt, NULL); |
910 | timer_mod(timers_state.icount_rt_timer, |
911 | qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL_RT) + 1000); |
912 | timers_state.icount_vm_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, |
913 | icount_adjust_vm, NULL); |
914 | timer_mod(timers_state.icount_vm_timer, |
915 | qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + |
916 | NANOSECONDS_PER_SECOND / 10); |
917 | } |
918 | |
919 | /***********************************************************/ |
920 | /* TCG vCPU kick timer |
921 | * |
922 | * The kick timer is responsible for moving single threaded vCPU |
923 | * emulation on to the next vCPU. If more than one vCPU is running a |
924 | * timer event with force a cpu->exit so the next vCPU can get |
925 | * scheduled. |
926 | * |
927 | * The timer is removed if all vCPUs are idle and restarted again once |
928 | * idleness is complete. |
929 | */ |
930 | |
931 | static QEMUTimer *tcg_kick_vcpu_timer; |
932 | static CPUState *tcg_current_rr_cpu; |
933 | |
934 | #define TCG_KICK_PERIOD (NANOSECONDS_PER_SECOND / 10) |
935 | |
936 | static inline int64_t qemu_tcg_next_kick(void) |
937 | { |
938 | return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + TCG_KICK_PERIOD; |
939 | } |
940 | |
941 | /* Kick the currently round-robin scheduled vCPU */ |
942 | static void qemu_cpu_kick_rr_cpu(void) |
943 | { |
944 | CPUState *cpu; |
945 | do { |
946 | cpu = atomic_mb_read(&tcg_current_rr_cpu); |
947 | if (cpu) { |
948 | cpu_exit(cpu); |
949 | } |
950 | } while (cpu != atomic_mb_read(&tcg_current_rr_cpu)); |
951 | } |
952 | |
953 | static void do_nothing(CPUState *cpu, run_on_cpu_data unused) |
954 | { |
955 | } |
956 | |
957 | void qemu_timer_notify_cb(void *opaque, QEMUClockType type) |
958 | { |
959 | if (!use_icount || type != QEMU_CLOCK_VIRTUAL) { |
960 | qemu_notify_event(); |
961 | return; |
962 | } |
963 | |
964 | if (qemu_in_vcpu_thread()) { |
965 | /* A CPU is currently running; kick it back out to the |
966 | * tcg_cpu_exec() loop so it will recalculate its |
967 | * icount deadline immediately. |
968 | */ |
969 | qemu_cpu_kick(current_cpu); |
970 | } else if (first_cpu) { |
971 | /* qemu_cpu_kick is not enough to kick a halted CPU out of |
972 | * qemu_tcg_wait_io_event. async_run_on_cpu, instead, |
973 | * causes cpu_thread_is_idle to return false. This way, |
974 | * handle_icount_deadline can run. |
975 | * If we have no CPUs at all for some reason, we don't |
976 | * need to do anything. |
977 | */ |
978 | async_run_on_cpu(first_cpu, do_nothing, RUN_ON_CPU_NULL); |
979 | } |
980 | } |
981 | |
982 | static void kick_tcg_thread(void *opaque) |
983 | { |
984 | timer_mod(tcg_kick_vcpu_timer, qemu_tcg_next_kick()); |
985 | qemu_cpu_kick_rr_cpu(); |
986 | } |
987 | |
988 | static void start_tcg_kick_timer(void) |
989 | { |
990 | assert(!mttcg_enabled); |
991 | if (!tcg_kick_vcpu_timer && CPU_NEXT(first_cpu)) { |
992 | tcg_kick_vcpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, |
993 | kick_tcg_thread, NULL); |
994 | } |
995 | if (tcg_kick_vcpu_timer && !timer_pending(tcg_kick_vcpu_timer)) { |
996 | timer_mod(tcg_kick_vcpu_timer, qemu_tcg_next_kick()); |
997 | } |
998 | } |
999 | |
1000 | static void stop_tcg_kick_timer(void) |
1001 | { |
1002 | assert(!mttcg_enabled); |
1003 | if (tcg_kick_vcpu_timer && timer_pending(tcg_kick_vcpu_timer)) { |
1004 | timer_del(tcg_kick_vcpu_timer); |
1005 | } |
1006 | } |
1007 | |
1008 | /***********************************************************/ |
1009 | void hw_error(const char *fmt, ...) |
1010 | { |
1011 | va_list ap; |
1012 | CPUState *cpu; |
1013 | |
1014 | va_start(ap, fmt); |
1015 | fprintf(stderr, "qemu: hardware error: " ); |
1016 | vfprintf(stderr, fmt, ap); |
1017 | fprintf(stderr, "\n" ); |
1018 | CPU_FOREACH(cpu) { |
1019 | fprintf(stderr, "CPU #%d:\n" , cpu->cpu_index); |
1020 | cpu_dump_state(cpu, stderr, CPU_DUMP_FPU); |
1021 | } |
1022 | va_end(ap); |
1023 | abort(); |
1024 | } |
1025 | |
1026 | void cpu_synchronize_all_states(void) |
1027 | { |
1028 | CPUState *cpu; |
1029 | |
1030 | CPU_FOREACH(cpu) { |
1031 | cpu_synchronize_state(cpu); |
1032 | /* TODO: move to cpu_synchronize_state() */ |
1033 | if (hvf_enabled()) { |
1034 | hvf_cpu_synchronize_state(cpu); |
1035 | } |
1036 | } |
1037 | } |
1038 | |
1039 | void cpu_synchronize_all_post_reset(void) |
1040 | { |
1041 | CPUState *cpu; |
1042 | |
1043 | CPU_FOREACH(cpu) { |
1044 | cpu_synchronize_post_reset(cpu); |
1045 | /* TODO: move to cpu_synchronize_post_reset() */ |
1046 | if (hvf_enabled()) { |
1047 | hvf_cpu_synchronize_post_reset(cpu); |
1048 | } |
1049 | } |
1050 | } |
1051 | |
1052 | void cpu_synchronize_all_post_init(void) |
1053 | { |
1054 | CPUState *cpu; |
1055 | |
1056 | CPU_FOREACH(cpu) { |
1057 | cpu_synchronize_post_init(cpu); |
1058 | /* TODO: move to cpu_synchronize_post_init() */ |
1059 | if (hvf_enabled()) { |
1060 | hvf_cpu_synchronize_post_init(cpu); |
1061 | } |
1062 | } |
1063 | } |
1064 | |
1065 | void cpu_synchronize_all_pre_loadvm(void) |
1066 | { |
1067 | CPUState *cpu; |
1068 | |
1069 | CPU_FOREACH(cpu) { |
1070 | cpu_synchronize_pre_loadvm(cpu); |
1071 | } |
1072 | } |
1073 | |
1074 | static int do_vm_stop(RunState state, bool send_stop) |
1075 | { |
1076 | int ret = 0; |
1077 | |
1078 | if (runstate_is_running()) { |
1079 | cpu_disable_ticks(); |
1080 | pause_all_vcpus(); |
1081 | runstate_set(state); |
1082 | vm_state_notify(0, state); |
1083 | if (send_stop) { |
1084 | qapi_event_send_stop(); |
1085 | } |
1086 | } |
1087 | |
1088 | bdrv_drain_all(); |
1089 | replay_disable_events(); |
1090 | ret = bdrv_flush_all(); |
1091 | |
1092 | return ret; |
1093 | } |
1094 | |
1095 | /* Special vm_stop() variant for terminating the process. Historically clients |
1096 | * did not expect a QMP STOP event and so we need to retain compatibility. |
1097 | */ |
1098 | int vm_shutdown(void) |
1099 | { |
1100 | return do_vm_stop(RUN_STATE_SHUTDOWN, false); |
1101 | } |
1102 | |
1103 | static bool cpu_can_run(CPUState *cpu) |
1104 | { |
1105 | if (cpu->stop) { |
1106 | return false; |
1107 | } |
1108 | if (cpu_is_stopped(cpu)) { |
1109 | return false; |
1110 | } |
1111 | return true; |
1112 | } |
1113 | |
1114 | static void cpu_handle_guest_debug(CPUState *cpu) |
1115 | { |
1116 | gdb_set_stop_cpu(cpu); |
1117 | qemu_system_debug_request(); |
1118 | cpu->stopped = true; |
1119 | } |
1120 | |
1121 | #ifdef CONFIG_LINUX |
1122 | static void sigbus_reraise(void) |
1123 | { |
1124 | sigset_t set; |
1125 | struct sigaction action; |
1126 | |
1127 | memset(&action, 0, sizeof(action)); |
1128 | action.sa_handler = SIG_DFL; |
1129 | if (!sigaction(SIGBUS, &action, NULL)) { |
1130 | raise(SIGBUS); |
1131 | sigemptyset(&set); |
1132 | sigaddset(&set, SIGBUS); |
1133 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); |
1134 | } |
1135 | perror("Failed to re-raise SIGBUS!\n" ); |
1136 | abort(); |
1137 | } |
1138 | |
1139 | static void sigbus_handler(int n, siginfo_t *siginfo, void *ctx) |
1140 | { |
1141 | if (siginfo->si_code != BUS_MCEERR_AO && siginfo->si_code != BUS_MCEERR_AR) { |
1142 | sigbus_reraise(); |
1143 | } |
1144 | |
1145 | if (current_cpu) { |
1146 | /* Called asynchronously in VCPU thread. */ |
1147 | if (kvm_on_sigbus_vcpu(current_cpu, siginfo->si_code, siginfo->si_addr)) { |
1148 | sigbus_reraise(); |
1149 | } |
1150 | } else { |
1151 | /* Called synchronously (via signalfd) in main thread. */ |
1152 | if (kvm_on_sigbus(siginfo->si_code, siginfo->si_addr)) { |
1153 | sigbus_reraise(); |
1154 | } |
1155 | } |
1156 | } |
1157 | |
1158 | static void qemu_init_sigbus(void) |
1159 | { |
1160 | struct sigaction action; |
1161 | |
1162 | memset(&action, 0, sizeof(action)); |
1163 | action.sa_flags = SA_SIGINFO; |
1164 | action.sa_sigaction = sigbus_handler; |
1165 | sigaction(SIGBUS, &action, NULL); |
1166 | |
1167 | prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0); |
1168 | } |
1169 | #else /* !CONFIG_LINUX */ |
1170 | static void qemu_init_sigbus(void) |
1171 | { |
1172 | } |
1173 | #endif /* !CONFIG_LINUX */ |
1174 | |
1175 | static QemuMutex qemu_global_mutex; |
1176 | |
1177 | static QemuThread io_thread; |
1178 | |
1179 | /* cpu creation */ |
1180 | static QemuCond qemu_cpu_cond; |
1181 | /* system init */ |
1182 | static QemuCond qemu_pause_cond; |
1183 | |
1184 | void qemu_init_cpu_loop(void) |
1185 | { |
1186 | qemu_init_sigbus(); |
1187 | qemu_cond_init(&qemu_cpu_cond); |
1188 | qemu_cond_init(&qemu_pause_cond); |
1189 | qemu_mutex_init(&qemu_global_mutex); |
1190 | |
1191 | qemu_thread_get_self(&io_thread); |
1192 | } |
1193 | |
1194 | void run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data) |
1195 | { |
1196 | do_run_on_cpu(cpu, func, data, &qemu_global_mutex); |
1197 | } |
1198 | |
1199 | static void qemu_kvm_destroy_vcpu(CPUState *cpu) |
1200 | { |
1201 | if (kvm_destroy_vcpu(cpu) < 0) { |
1202 | error_report("kvm_destroy_vcpu failed" ); |
1203 | exit(EXIT_FAILURE); |
1204 | } |
1205 | } |
1206 | |
1207 | static void qemu_tcg_destroy_vcpu(CPUState *cpu) |
1208 | { |
1209 | } |
1210 | |
1211 | static void qemu_cpu_stop(CPUState *cpu, bool exit) |
1212 | { |
1213 | g_assert(qemu_cpu_is_self(cpu)); |
1214 | cpu->stop = false; |
1215 | cpu->stopped = true; |
1216 | if (exit) { |
1217 | cpu_exit(cpu); |
1218 | } |
1219 | qemu_cond_broadcast(&qemu_pause_cond); |
1220 | } |
1221 | |
1222 | static void qemu_wait_io_event_common(CPUState *cpu) |
1223 | { |
1224 | atomic_mb_set(&cpu->thread_kicked, false); |
1225 | if (cpu->stop) { |
1226 | qemu_cpu_stop(cpu, false); |
1227 | } |
1228 | process_queued_cpu_work(cpu); |
1229 | } |
1230 | |
1231 | static void qemu_tcg_rr_wait_io_event(void) |
1232 | { |
1233 | CPUState *cpu; |
1234 | |
1235 | while (all_cpu_threads_idle()) { |
1236 | stop_tcg_kick_timer(); |
1237 | qemu_cond_wait(first_cpu->halt_cond, &qemu_global_mutex); |
1238 | } |
1239 | |
1240 | start_tcg_kick_timer(); |
1241 | |
1242 | CPU_FOREACH(cpu) { |
1243 | qemu_wait_io_event_common(cpu); |
1244 | } |
1245 | } |
1246 | |
1247 | static void qemu_wait_io_event(CPUState *cpu) |
1248 | { |
1249 | while (cpu_thread_is_idle(cpu)) { |
1250 | qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex); |
1251 | } |
1252 | |
1253 | #ifdef _WIN32 |
1254 | /* Eat dummy APC queued by qemu_cpu_kick_thread. */ |
1255 | if (!tcg_enabled()) { |
1256 | SleepEx(0, TRUE); |
1257 | } |
1258 | #endif |
1259 | qemu_wait_io_event_common(cpu); |
1260 | } |
1261 | |
1262 | static void *qemu_kvm_cpu_thread_fn(void *arg) |
1263 | { |
1264 | CPUState *cpu = arg; |
1265 | int r; |
1266 | |
1267 | rcu_register_thread(); |
1268 | |
1269 | qemu_mutex_lock_iothread(); |
1270 | qemu_thread_get_self(cpu->thread); |
1271 | cpu->thread_id = qemu_get_thread_id(); |
1272 | cpu->can_do_io = 1; |
1273 | current_cpu = cpu; |
1274 | |
1275 | r = kvm_init_vcpu(cpu); |
1276 | if (r < 0) { |
1277 | error_report("kvm_init_vcpu failed: %s" , strerror(-r)); |
1278 | exit(1); |
1279 | } |
1280 | |
1281 | kvm_init_cpu_signals(cpu); |
1282 | |
1283 | /* signal CPU creation */ |
1284 | cpu->created = true; |
1285 | qemu_cond_signal(&qemu_cpu_cond); |
1286 | qemu_guest_random_seed_thread_part2(cpu->random_seed); |
1287 | |
1288 | do { |
1289 | if (cpu_can_run(cpu)) { |
1290 | r = kvm_cpu_exec(cpu); |
1291 | if (r == EXCP_DEBUG) { |
1292 | cpu_handle_guest_debug(cpu); |
1293 | } |
1294 | } |
1295 | qemu_wait_io_event(cpu); |
1296 | } while (!cpu->unplug || cpu_can_run(cpu)); |
1297 | |
1298 | qemu_kvm_destroy_vcpu(cpu); |
1299 | cpu->created = false; |
1300 | qemu_cond_signal(&qemu_cpu_cond); |
1301 | qemu_mutex_unlock_iothread(); |
1302 | rcu_unregister_thread(); |
1303 | return NULL; |
1304 | } |
1305 | |
1306 | static void *qemu_dummy_cpu_thread_fn(void *arg) |
1307 | { |
1308 | #ifdef _WIN32 |
1309 | error_report("qtest is not supported under Windows" ); |
1310 | exit(1); |
1311 | #else |
1312 | CPUState *cpu = arg; |
1313 | sigset_t waitset; |
1314 | int r; |
1315 | |
1316 | rcu_register_thread(); |
1317 | |
1318 | qemu_mutex_lock_iothread(); |
1319 | qemu_thread_get_self(cpu->thread); |
1320 | cpu->thread_id = qemu_get_thread_id(); |
1321 | cpu->can_do_io = 1; |
1322 | current_cpu = cpu; |
1323 | |
1324 | sigemptyset(&waitset); |
1325 | sigaddset(&waitset, SIG_IPI); |
1326 | |
1327 | /* signal CPU creation */ |
1328 | cpu->created = true; |
1329 | qemu_cond_signal(&qemu_cpu_cond); |
1330 | qemu_guest_random_seed_thread_part2(cpu->random_seed); |
1331 | |
1332 | do { |
1333 | qemu_mutex_unlock_iothread(); |
1334 | do { |
1335 | int sig; |
1336 | r = sigwait(&waitset, &sig); |
1337 | } while (r == -1 && (errno == EAGAIN || errno == EINTR)); |
1338 | if (r == -1) { |
1339 | perror("sigwait" ); |
1340 | exit(1); |
1341 | } |
1342 | qemu_mutex_lock_iothread(); |
1343 | qemu_wait_io_event(cpu); |
1344 | } while (!cpu->unplug); |
1345 | |
1346 | qemu_mutex_unlock_iothread(); |
1347 | rcu_unregister_thread(); |
1348 | return NULL; |
1349 | #endif |
1350 | } |
1351 | |
1352 | static int64_t tcg_get_icount_limit(void) |
1353 | { |
1354 | int64_t deadline; |
1355 | |
1356 | if (replay_mode != REPLAY_MODE_PLAY) { |
1357 | /* |
1358 | * Include all the timers, because they may need an attention. |
1359 | * Too long CPU execution may create unnecessary delay in UI. |
1360 | */ |
1361 | deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL, |
1362 | QEMU_TIMER_ATTR_ALL); |
1363 | |
1364 | /* Maintain prior (possibly buggy) behaviour where if no deadline |
1365 | * was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than |
1366 | * INT32_MAX nanoseconds ahead, we still use INT32_MAX |
1367 | * nanoseconds. |
1368 | */ |
1369 | if ((deadline < 0) || (deadline > INT32_MAX)) { |
1370 | deadline = INT32_MAX; |
1371 | } |
1372 | |
1373 | return qemu_icount_round(deadline); |
1374 | } else { |
1375 | return replay_get_instructions(); |
1376 | } |
1377 | } |
1378 | |
1379 | static void handle_icount_deadline(void) |
1380 | { |
1381 | assert(qemu_in_vcpu_thread()); |
1382 | if (use_icount) { |
1383 | int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL, |
1384 | QEMU_TIMER_ATTR_ALL); |
1385 | |
1386 | if (deadline == 0) { |
1387 | /* Wake up other AioContexts. */ |
1388 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); |
1389 | qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL); |
1390 | } |
1391 | } |
1392 | } |
1393 | |
1394 | static void prepare_icount_for_run(CPUState *cpu) |
1395 | { |
1396 | if (use_icount) { |
1397 | int insns_left; |
1398 | |
1399 | /* These should always be cleared by process_icount_data after |
1400 | * each vCPU execution. However u16.high can be raised |
1401 | * asynchronously by cpu_exit/cpu_interrupt/tcg_handle_interrupt |
1402 | */ |
1403 | g_assert(cpu_neg(cpu)->icount_decr.u16.low == 0); |
1404 | g_assert(cpu->icount_extra == 0); |
1405 | |
1406 | cpu->icount_budget = tcg_get_icount_limit(); |
1407 | insns_left = MIN(0xffff, cpu->icount_budget); |
1408 | cpu_neg(cpu)->icount_decr.u16.low = insns_left; |
1409 | cpu->icount_extra = cpu->icount_budget - insns_left; |
1410 | |
1411 | replay_mutex_lock(); |
1412 | } |
1413 | } |
1414 | |
1415 | static void process_icount_data(CPUState *cpu) |
1416 | { |
1417 | if (use_icount) { |
1418 | /* Account for executed instructions */ |
1419 | cpu_update_icount(cpu); |
1420 | |
1421 | /* Reset the counters */ |
1422 | cpu_neg(cpu)->icount_decr.u16.low = 0; |
1423 | cpu->icount_extra = 0; |
1424 | cpu->icount_budget = 0; |
1425 | |
1426 | replay_account_executed_instructions(); |
1427 | |
1428 | replay_mutex_unlock(); |
1429 | } |
1430 | } |
1431 | |
1432 | |
1433 | static int tcg_cpu_exec(CPUState *cpu) |
1434 | { |
1435 | int ret; |
1436 | #ifdef CONFIG_PROFILER |
1437 | int64_t ti; |
1438 | #endif |
1439 | |
1440 | assert(tcg_enabled()); |
1441 | #ifdef CONFIG_PROFILER |
1442 | ti = profile_getclock(); |
1443 | #endif |
1444 | cpu_exec_start(cpu); |
1445 | ret = cpu_exec(cpu); |
1446 | cpu_exec_end(cpu); |
1447 | #ifdef CONFIG_PROFILER |
1448 | atomic_set(&tcg_ctx->prof.cpu_exec_time, |
1449 | tcg_ctx->prof.cpu_exec_time + profile_getclock() - ti); |
1450 | #endif |
1451 | return ret; |
1452 | } |
1453 | |
1454 | /* Destroy any remaining vCPUs which have been unplugged and have |
1455 | * finished running |
1456 | */ |
1457 | static void deal_with_unplugged_cpus(void) |
1458 | { |
1459 | CPUState *cpu; |
1460 | |
1461 | CPU_FOREACH(cpu) { |
1462 | if (cpu->unplug && !cpu_can_run(cpu)) { |
1463 | qemu_tcg_destroy_vcpu(cpu); |
1464 | cpu->created = false; |
1465 | qemu_cond_signal(&qemu_cpu_cond); |
1466 | break; |
1467 | } |
1468 | } |
1469 | } |
1470 | |
1471 | /* Single-threaded TCG |
1472 | * |
1473 | * In the single-threaded case each vCPU is simulated in turn. If |
1474 | * there is more than a single vCPU we create a simple timer to kick |
1475 | * the vCPU and ensure we don't get stuck in a tight loop in one vCPU. |
1476 | * This is done explicitly rather than relying on side-effects |
1477 | * elsewhere. |
1478 | */ |
1479 | |
1480 | static void *qemu_tcg_rr_cpu_thread_fn(void *arg) |
1481 | { |
1482 | CPUState *cpu = arg; |
1483 | |
1484 | assert(tcg_enabled()); |
1485 | rcu_register_thread(); |
1486 | tcg_register_thread(); |
1487 | |
1488 | qemu_mutex_lock_iothread(); |
1489 | qemu_thread_get_self(cpu->thread); |
1490 | |
1491 | cpu->thread_id = qemu_get_thread_id(); |
1492 | cpu->created = true; |
1493 | cpu->can_do_io = 1; |
1494 | qemu_cond_signal(&qemu_cpu_cond); |
1495 | qemu_guest_random_seed_thread_part2(cpu->random_seed); |
1496 | |
1497 | /* wait for initial kick-off after machine start */ |
1498 | while (first_cpu->stopped) { |
1499 | qemu_cond_wait(first_cpu->halt_cond, &qemu_global_mutex); |
1500 | |
1501 | /* process any pending work */ |
1502 | CPU_FOREACH(cpu) { |
1503 | current_cpu = cpu; |
1504 | qemu_wait_io_event_common(cpu); |
1505 | } |
1506 | } |
1507 | |
1508 | start_tcg_kick_timer(); |
1509 | |
1510 | cpu = first_cpu; |
1511 | |
1512 | /* process any pending work */ |
1513 | cpu->exit_request = 1; |
1514 | |
1515 | while (1) { |
1516 | qemu_mutex_unlock_iothread(); |
1517 | replay_mutex_lock(); |
1518 | qemu_mutex_lock_iothread(); |
1519 | /* Account partial waits to QEMU_CLOCK_VIRTUAL. */ |
1520 | qemu_account_warp_timer(); |
1521 | |
1522 | /* Run the timers here. This is much more efficient than |
1523 | * waking up the I/O thread and waiting for completion. |
1524 | */ |
1525 | handle_icount_deadline(); |
1526 | |
1527 | replay_mutex_unlock(); |
1528 | |
1529 | if (!cpu) { |
1530 | cpu = first_cpu; |
1531 | } |
1532 | |
1533 | while (cpu && !cpu->queued_work_first && !cpu->exit_request) { |
1534 | |
1535 | atomic_mb_set(&tcg_current_rr_cpu, cpu); |
1536 | current_cpu = cpu; |
1537 | |
1538 | qemu_clock_enable(QEMU_CLOCK_VIRTUAL, |
1539 | (cpu->singlestep_enabled & SSTEP_NOTIMER) == 0); |
1540 | |
1541 | if (cpu_can_run(cpu)) { |
1542 | int r; |
1543 | |
1544 | qemu_mutex_unlock_iothread(); |
1545 | prepare_icount_for_run(cpu); |
1546 | |
1547 | r = tcg_cpu_exec(cpu); |
1548 | |
1549 | process_icount_data(cpu); |
1550 | qemu_mutex_lock_iothread(); |
1551 | |
1552 | if (r == EXCP_DEBUG) { |
1553 | cpu_handle_guest_debug(cpu); |
1554 | break; |
1555 | } else if (r == EXCP_ATOMIC) { |
1556 | qemu_mutex_unlock_iothread(); |
1557 | cpu_exec_step_atomic(cpu); |
1558 | qemu_mutex_lock_iothread(); |
1559 | break; |
1560 | } |
1561 | } else if (cpu->stop) { |
1562 | if (cpu->unplug) { |
1563 | cpu = CPU_NEXT(cpu); |
1564 | } |
1565 | break; |
1566 | } |
1567 | |
1568 | cpu = CPU_NEXT(cpu); |
1569 | } /* while (cpu && !cpu->exit_request).. */ |
1570 | |
1571 | /* Does not need atomic_mb_set because a spurious wakeup is okay. */ |
1572 | atomic_set(&tcg_current_rr_cpu, NULL); |
1573 | |
1574 | if (cpu && cpu->exit_request) { |
1575 | atomic_mb_set(&cpu->exit_request, 0); |
1576 | } |
1577 | |
1578 | if (use_icount && all_cpu_threads_idle()) { |
1579 | /* |
1580 | * When all cpus are sleeping (e.g in WFI), to avoid a deadlock |
1581 | * in the main_loop, wake it up in order to start the warp timer. |
1582 | */ |
1583 | qemu_notify_event(); |
1584 | } |
1585 | |
1586 | qemu_tcg_rr_wait_io_event(); |
1587 | deal_with_unplugged_cpus(); |
1588 | } |
1589 | |
1590 | rcu_unregister_thread(); |
1591 | return NULL; |
1592 | } |
1593 | |
1594 | static void *qemu_hax_cpu_thread_fn(void *arg) |
1595 | { |
1596 | CPUState *cpu = arg; |
1597 | int r; |
1598 | |
1599 | rcu_register_thread(); |
1600 | qemu_mutex_lock_iothread(); |
1601 | qemu_thread_get_self(cpu->thread); |
1602 | |
1603 | cpu->thread_id = qemu_get_thread_id(); |
1604 | cpu->created = true; |
1605 | current_cpu = cpu; |
1606 | |
1607 | hax_init_vcpu(cpu); |
1608 | qemu_cond_signal(&qemu_cpu_cond); |
1609 | qemu_guest_random_seed_thread_part2(cpu->random_seed); |
1610 | |
1611 | do { |
1612 | if (cpu_can_run(cpu)) { |
1613 | r = hax_smp_cpu_exec(cpu); |
1614 | if (r == EXCP_DEBUG) { |
1615 | cpu_handle_guest_debug(cpu); |
1616 | } |
1617 | } |
1618 | |
1619 | qemu_wait_io_event(cpu); |
1620 | } while (!cpu->unplug || cpu_can_run(cpu)); |
1621 | rcu_unregister_thread(); |
1622 | return NULL; |
1623 | } |
1624 | |
1625 | /* The HVF-specific vCPU thread function. This one should only run when the host |
1626 | * CPU supports the VMX "unrestricted guest" feature. */ |
1627 | static void *qemu_hvf_cpu_thread_fn(void *arg) |
1628 | { |
1629 | CPUState *cpu = arg; |
1630 | |
1631 | int r; |
1632 | |
1633 | assert(hvf_enabled()); |
1634 | |
1635 | rcu_register_thread(); |
1636 | |
1637 | qemu_mutex_lock_iothread(); |
1638 | qemu_thread_get_self(cpu->thread); |
1639 | |
1640 | cpu->thread_id = qemu_get_thread_id(); |
1641 | cpu->can_do_io = 1; |
1642 | current_cpu = cpu; |
1643 | |
1644 | hvf_init_vcpu(cpu); |
1645 | |
1646 | /* signal CPU creation */ |
1647 | cpu->created = true; |
1648 | qemu_cond_signal(&qemu_cpu_cond); |
1649 | qemu_guest_random_seed_thread_part2(cpu->random_seed); |
1650 | |
1651 | do { |
1652 | if (cpu_can_run(cpu)) { |
1653 | r = hvf_vcpu_exec(cpu); |
1654 | if (r == EXCP_DEBUG) { |
1655 | cpu_handle_guest_debug(cpu); |
1656 | } |
1657 | } |
1658 | qemu_wait_io_event(cpu); |
1659 | } while (!cpu->unplug || cpu_can_run(cpu)); |
1660 | |
1661 | hvf_vcpu_destroy(cpu); |
1662 | cpu->created = false; |
1663 | qemu_cond_signal(&qemu_cpu_cond); |
1664 | qemu_mutex_unlock_iothread(); |
1665 | rcu_unregister_thread(); |
1666 | return NULL; |
1667 | } |
1668 | |
1669 | static void *qemu_whpx_cpu_thread_fn(void *arg) |
1670 | { |
1671 | CPUState *cpu = arg; |
1672 | int r; |
1673 | |
1674 | rcu_register_thread(); |
1675 | |
1676 | qemu_mutex_lock_iothread(); |
1677 | qemu_thread_get_self(cpu->thread); |
1678 | cpu->thread_id = qemu_get_thread_id(); |
1679 | current_cpu = cpu; |
1680 | |
1681 | r = whpx_init_vcpu(cpu); |
1682 | if (r < 0) { |
1683 | fprintf(stderr, "whpx_init_vcpu failed: %s\n" , strerror(-r)); |
1684 | exit(1); |
1685 | } |
1686 | |
1687 | /* signal CPU creation */ |
1688 | cpu->created = true; |
1689 | qemu_cond_signal(&qemu_cpu_cond); |
1690 | qemu_guest_random_seed_thread_part2(cpu->random_seed); |
1691 | |
1692 | do { |
1693 | if (cpu_can_run(cpu)) { |
1694 | r = whpx_vcpu_exec(cpu); |
1695 | if (r == EXCP_DEBUG) { |
1696 | cpu_handle_guest_debug(cpu); |
1697 | } |
1698 | } |
1699 | while (cpu_thread_is_idle(cpu)) { |
1700 | qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex); |
1701 | } |
1702 | qemu_wait_io_event_common(cpu); |
1703 | } while (!cpu->unplug || cpu_can_run(cpu)); |
1704 | |
1705 | whpx_destroy_vcpu(cpu); |
1706 | cpu->created = false; |
1707 | qemu_cond_signal(&qemu_cpu_cond); |
1708 | qemu_mutex_unlock_iothread(); |
1709 | rcu_unregister_thread(); |
1710 | return NULL; |
1711 | } |
1712 | |
1713 | #ifdef _WIN32 |
1714 | static void CALLBACK dummy_apc_func(ULONG_PTR unused) |
1715 | { |
1716 | } |
1717 | #endif |
1718 | |
1719 | /* Multi-threaded TCG |
1720 | * |
1721 | * In the multi-threaded case each vCPU has its own thread. The TLS |
1722 | * variable current_cpu can be used deep in the code to find the |
1723 | * current CPUState for a given thread. |
1724 | */ |
1725 | |
1726 | static void *qemu_tcg_cpu_thread_fn(void *arg) |
1727 | { |
1728 | CPUState *cpu = arg; |
1729 | |
1730 | assert(tcg_enabled()); |
1731 | g_assert(!use_icount); |
1732 | |
1733 | rcu_register_thread(); |
1734 | tcg_register_thread(); |
1735 | |
1736 | qemu_mutex_lock_iothread(); |
1737 | qemu_thread_get_self(cpu->thread); |
1738 | |
1739 | cpu->thread_id = qemu_get_thread_id(); |
1740 | cpu->created = true; |
1741 | cpu->can_do_io = 1; |
1742 | current_cpu = cpu; |
1743 | qemu_cond_signal(&qemu_cpu_cond); |
1744 | qemu_guest_random_seed_thread_part2(cpu->random_seed); |
1745 | |
1746 | /* process any pending work */ |
1747 | cpu->exit_request = 1; |
1748 | |
1749 | do { |
1750 | if (cpu_can_run(cpu)) { |
1751 | int r; |
1752 | qemu_mutex_unlock_iothread(); |
1753 | r = tcg_cpu_exec(cpu); |
1754 | qemu_mutex_lock_iothread(); |
1755 | switch (r) { |
1756 | case EXCP_DEBUG: |
1757 | cpu_handle_guest_debug(cpu); |
1758 | break; |
1759 | case EXCP_HALTED: |
1760 | /* during start-up the vCPU is reset and the thread is |
1761 | * kicked several times. If we don't ensure we go back |
1762 | * to sleep in the halted state we won't cleanly |
1763 | * start-up when the vCPU is enabled. |
1764 | * |
1765 | * cpu->halted should ensure we sleep in wait_io_event |
1766 | */ |
1767 | g_assert(cpu->halted); |
1768 | break; |
1769 | case EXCP_ATOMIC: |
1770 | qemu_mutex_unlock_iothread(); |
1771 | cpu_exec_step_atomic(cpu); |
1772 | qemu_mutex_lock_iothread(); |
1773 | default: |
1774 | /* Ignore everything else? */ |
1775 | break; |
1776 | } |
1777 | } |
1778 | |
1779 | atomic_mb_set(&cpu->exit_request, 0); |
1780 | qemu_wait_io_event(cpu); |
1781 | } while (!cpu->unplug || cpu_can_run(cpu)); |
1782 | |
1783 | qemu_tcg_destroy_vcpu(cpu); |
1784 | cpu->created = false; |
1785 | qemu_cond_signal(&qemu_cpu_cond); |
1786 | qemu_mutex_unlock_iothread(); |
1787 | rcu_unregister_thread(); |
1788 | return NULL; |
1789 | } |
1790 | |
1791 | static void qemu_cpu_kick_thread(CPUState *cpu) |
1792 | { |
1793 | #ifndef _WIN32 |
1794 | int err; |
1795 | |
1796 | if (cpu->thread_kicked) { |
1797 | return; |
1798 | } |
1799 | cpu->thread_kicked = true; |
1800 | err = pthread_kill(cpu->thread->thread, SIG_IPI); |
1801 | if (err && err != ESRCH) { |
1802 | fprintf(stderr, "qemu:%s: %s" , __func__, strerror(err)); |
1803 | exit(1); |
1804 | } |
1805 | #else /* _WIN32 */ |
1806 | if (!qemu_cpu_is_self(cpu)) { |
1807 | if (whpx_enabled()) { |
1808 | whpx_vcpu_kick(cpu); |
1809 | } else if (!QueueUserAPC(dummy_apc_func, cpu->hThread, 0)) { |
1810 | fprintf(stderr, "%s: QueueUserAPC failed with error %lu\n" , |
1811 | __func__, GetLastError()); |
1812 | exit(1); |
1813 | } |
1814 | } |
1815 | #endif |
1816 | } |
1817 | |
1818 | void qemu_cpu_kick(CPUState *cpu) |
1819 | { |
1820 | qemu_cond_broadcast(cpu->halt_cond); |
1821 | if (tcg_enabled()) { |
1822 | cpu_exit(cpu); |
1823 | /* NOP unless doing single-thread RR */ |
1824 | qemu_cpu_kick_rr_cpu(); |
1825 | } else { |
1826 | if (hax_enabled()) { |
1827 | /* |
1828 | * FIXME: race condition with the exit_request check in |
1829 | * hax_vcpu_hax_exec |
1830 | */ |
1831 | cpu->exit_request = 1; |
1832 | } |
1833 | qemu_cpu_kick_thread(cpu); |
1834 | } |
1835 | } |
1836 | |
1837 | void qemu_cpu_kick_self(void) |
1838 | { |
1839 | assert(current_cpu); |
1840 | qemu_cpu_kick_thread(current_cpu); |
1841 | } |
1842 | |
1843 | bool qemu_cpu_is_self(CPUState *cpu) |
1844 | { |
1845 | return qemu_thread_is_self(cpu->thread); |
1846 | } |
1847 | |
1848 | bool qemu_in_vcpu_thread(void) |
1849 | { |
1850 | return current_cpu && qemu_cpu_is_self(current_cpu); |
1851 | } |
1852 | |
1853 | static __thread bool iothread_locked = false; |
1854 | |
1855 | bool qemu_mutex_iothread_locked(void) |
1856 | { |
1857 | return iothread_locked; |
1858 | } |
1859 | |
1860 | /* |
1861 | * The BQL is taken from so many places that it is worth profiling the |
1862 | * callers directly, instead of funneling them all through a single function. |
1863 | */ |
1864 | void qemu_mutex_lock_iothread_impl(const char *file, int line) |
1865 | { |
1866 | QemuMutexLockFunc bql_lock = atomic_read(&qemu_bql_mutex_lock_func); |
1867 | |
1868 | g_assert(!qemu_mutex_iothread_locked()); |
1869 | bql_lock(&qemu_global_mutex, file, line); |
1870 | iothread_locked = true; |
1871 | } |
1872 | |
1873 | void qemu_mutex_unlock_iothread(void) |
1874 | { |
1875 | g_assert(qemu_mutex_iothread_locked()); |
1876 | iothread_locked = false; |
1877 | qemu_mutex_unlock(&qemu_global_mutex); |
1878 | } |
1879 | |
1880 | static bool all_vcpus_paused(void) |
1881 | { |
1882 | CPUState *cpu; |
1883 | |
1884 | CPU_FOREACH(cpu) { |
1885 | if (!cpu->stopped) { |
1886 | return false; |
1887 | } |
1888 | } |
1889 | |
1890 | return true; |
1891 | } |
1892 | |
1893 | void pause_all_vcpus(void) |
1894 | { |
1895 | CPUState *cpu; |
1896 | |
1897 | qemu_clock_enable(QEMU_CLOCK_VIRTUAL, false); |
1898 | CPU_FOREACH(cpu) { |
1899 | if (qemu_cpu_is_self(cpu)) { |
1900 | qemu_cpu_stop(cpu, true); |
1901 | } else { |
1902 | cpu->stop = true; |
1903 | qemu_cpu_kick(cpu); |
1904 | } |
1905 | } |
1906 | |
1907 | /* We need to drop the replay_lock so any vCPU threads woken up |
1908 | * can finish their replay tasks |
1909 | */ |
1910 | replay_mutex_unlock(); |
1911 | |
1912 | while (!all_vcpus_paused()) { |
1913 | qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex); |
1914 | CPU_FOREACH(cpu) { |
1915 | qemu_cpu_kick(cpu); |
1916 | } |
1917 | } |
1918 | |
1919 | qemu_mutex_unlock_iothread(); |
1920 | replay_mutex_lock(); |
1921 | qemu_mutex_lock_iothread(); |
1922 | } |
1923 | |
1924 | void cpu_resume(CPUState *cpu) |
1925 | { |
1926 | cpu->stop = false; |
1927 | cpu->stopped = false; |
1928 | qemu_cpu_kick(cpu); |
1929 | } |
1930 | |
1931 | void resume_all_vcpus(void) |
1932 | { |
1933 | CPUState *cpu; |
1934 | |
1935 | qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true); |
1936 | CPU_FOREACH(cpu) { |
1937 | cpu_resume(cpu); |
1938 | } |
1939 | } |
1940 | |
1941 | void cpu_remove_sync(CPUState *cpu) |
1942 | { |
1943 | cpu->stop = true; |
1944 | cpu->unplug = true; |
1945 | qemu_cpu_kick(cpu); |
1946 | qemu_mutex_unlock_iothread(); |
1947 | qemu_thread_join(cpu->thread); |
1948 | qemu_mutex_lock_iothread(); |
1949 | } |
1950 | |
1951 | /* For temporary buffers for forming a name */ |
1952 | #define VCPU_THREAD_NAME_SIZE 16 |
1953 | |
1954 | static void qemu_tcg_init_vcpu(CPUState *cpu) |
1955 | { |
1956 | char thread_name[VCPU_THREAD_NAME_SIZE]; |
1957 | static QemuCond *single_tcg_halt_cond; |
1958 | static QemuThread *single_tcg_cpu_thread; |
1959 | static int tcg_region_inited; |
1960 | |
1961 | assert(tcg_enabled()); |
1962 | /* |
1963 | * Initialize TCG regions--once. Now is a good time, because: |
1964 | * (1) TCG's init context, prologue and target globals have been set up. |
1965 | * (2) qemu_tcg_mttcg_enabled() works now (TCG init code runs before the |
1966 | * -accel flag is processed, so the check doesn't work then). |
1967 | */ |
1968 | if (!tcg_region_inited) { |
1969 | tcg_region_inited = 1; |
1970 | tcg_region_init(); |
1971 | } |
1972 | |
1973 | if (qemu_tcg_mttcg_enabled() || !single_tcg_cpu_thread) { |
1974 | cpu->thread = g_malloc0(sizeof(QemuThread)); |
1975 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); |
1976 | qemu_cond_init(cpu->halt_cond); |
1977 | |
1978 | if (qemu_tcg_mttcg_enabled()) { |
1979 | /* create a thread per vCPU with TCG (MTTCG) */ |
1980 | parallel_cpus = true; |
1981 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/TCG" , |
1982 | cpu->cpu_index); |
1983 | |
1984 | qemu_thread_create(cpu->thread, thread_name, qemu_tcg_cpu_thread_fn, |
1985 | cpu, QEMU_THREAD_JOINABLE); |
1986 | |
1987 | } else { |
1988 | /* share a single thread for all cpus with TCG */ |
1989 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "ALL CPUs/TCG" ); |
1990 | qemu_thread_create(cpu->thread, thread_name, |
1991 | qemu_tcg_rr_cpu_thread_fn, |
1992 | cpu, QEMU_THREAD_JOINABLE); |
1993 | |
1994 | single_tcg_halt_cond = cpu->halt_cond; |
1995 | single_tcg_cpu_thread = cpu->thread; |
1996 | } |
1997 | #ifdef _WIN32 |
1998 | cpu->hThread = qemu_thread_get_handle(cpu->thread); |
1999 | #endif |
2000 | } else { |
2001 | /* For non-MTTCG cases we share the thread */ |
2002 | cpu->thread = single_tcg_cpu_thread; |
2003 | cpu->halt_cond = single_tcg_halt_cond; |
2004 | cpu->thread_id = first_cpu->thread_id; |
2005 | cpu->can_do_io = 1; |
2006 | cpu->created = true; |
2007 | } |
2008 | } |
2009 | |
2010 | static void qemu_hax_start_vcpu(CPUState *cpu) |
2011 | { |
2012 | char thread_name[VCPU_THREAD_NAME_SIZE]; |
2013 | |
2014 | cpu->thread = g_malloc0(sizeof(QemuThread)); |
2015 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); |
2016 | qemu_cond_init(cpu->halt_cond); |
2017 | |
2018 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/HAX" , |
2019 | cpu->cpu_index); |
2020 | qemu_thread_create(cpu->thread, thread_name, qemu_hax_cpu_thread_fn, |
2021 | cpu, QEMU_THREAD_JOINABLE); |
2022 | #ifdef _WIN32 |
2023 | cpu->hThread = qemu_thread_get_handle(cpu->thread); |
2024 | #endif |
2025 | } |
2026 | |
2027 | static void qemu_kvm_start_vcpu(CPUState *cpu) |
2028 | { |
2029 | char thread_name[VCPU_THREAD_NAME_SIZE]; |
2030 | |
2031 | cpu->thread = g_malloc0(sizeof(QemuThread)); |
2032 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); |
2033 | qemu_cond_init(cpu->halt_cond); |
2034 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/KVM" , |
2035 | cpu->cpu_index); |
2036 | qemu_thread_create(cpu->thread, thread_name, qemu_kvm_cpu_thread_fn, |
2037 | cpu, QEMU_THREAD_JOINABLE); |
2038 | } |
2039 | |
2040 | static void qemu_hvf_start_vcpu(CPUState *cpu) |
2041 | { |
2042 | char thread_name[VCPU_THREAD_NAME_SIZE]; |
2043 | |
2044 | /* HVF currently does not support TCG, and only runs in |
2045 | * unrestricted-guest mode. */ |
2046 | assert(hvf_enabled()); |
2047 | |
2048 | cpu->thread = g_malloc0(sizeof(QemuThread)); |
2049 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); |
2050 | qemu_cond_init(cpu->halt_cond); |
2051 | |
2052 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/HVF" , |
2053 | cpu->cpu_index); |
2054 | qemu_thread_create(cpu->thread, thread_name, qemu_hvf_cpu_thread_fn, |
2055 | cpu, QEMU_THREAD_JOINABLE); |
2056 | } |
2057 | |
2058 | static void qemu_whpx_start_vcpu(CPUState *cpu) |
2059 | { |
2060 | char thread_name[VCPU_THREAD_NAME_SIZE]; |
2061 | |
2062 | cpu->thread = g_malloc0(sizeof(QemuThread)); |
2063 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); |
2064 | qemu_cond_init(cpu->halt_cond); |
2065 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/WHPX" , |
2066 | cpu->cpu_index); |
2067 | qemu_thread_create(cpu->thread, thread_name, qemu_whpx_cpu_thread_fn, |
2068 | cpu, QEMU_THREAD_JOINABLE); |
2069 | #ifdef _WIN32 |
2070 | cpu->hThread = qemu_thread_get_handle(cpu->thread); |
2071 | #endif |
2072 | } |
2073 | |
2074 | static void qemu_dummy_start_vcpu(CPUState *cpu) |
2075 | { |
2076 | char thread_name[VCPU_THREAD_NAME_SIZE]; |
2077 | |
2078 | cpu->thread = g_malloc0(sizeof(QemuThread)); |
2079 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); |
2080 | qemu_cond_init(cpu->halt_cond); |
2081 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY" , |
2082 | cpu->cpu_index); |
2083 | qemu_thread_create(cpu->thread, thread_name, qemu_dummy_cpu_thread_fn, cpu, |
2084 | QEMU_THREAD_JOINABLE); |
2085 | } |
2086 | |
2087 | void qemu_init_vcpu(CPUState *cpu) |
2088 | { |
2089 | MachineState *ms = MACHINE(qdev_get_machine()); |
2090 | |
2091 | cpu->nr_cores = ms->smp.cores; |
2092 | cpu->nr_threads = ms->smp.threads; |
2093 | cpu->stopped = true; |
2094 | cpu->random_seed = qemu_guest_random_seed_thread_part1(); |
2095 | |
2096 | if (!cpu->as) { |
2097 | /* If the target cpu hasn't set up any address spaces itself, |
2098 | * give it the default one. |
2099 | */ |
2100 | cpu->num_ases = 1; |
2101 | cpu_address_space_init(cpu, 0, "cpu-memory" , cpu->memory); |
2102 | } |
2103 | |
2104 | if (kvm_enabled()) { |
2105 | qemu_kvm_start_vcpu(cpu); |
2106 | } else if (hax_enabled()) { |
2107 | qemu_hax_start_vcpu(cpu); |
2108 | } else if (hvf_enabled()) { |
2109 | qemu_hvf_start_vcpu(cpu); |
2110 | } else if (tcg_enabled()) { |
2111 | qemu_tcg_init_vcpu(cpu); |
2112 | } else if (whpx_enabled()) { |
2113 | qemu_whpx_start_vcpu(cpu); |
2114 | } else { |
2115 | qemu_dummy_start_vcpu(cpu); |
2116 | } |
2117 | |
2118 | while (!cpu->created) { |
2119 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); |
2120 | } |
2121 | } |
2122 | |
2123 | void cpu_stop_current(void) |
2124 | { |
2125 | if (current_cpu) { |
2126 | current_cpu->stop = true; |
2127 | cpu_exit(current_cpu); |
2128 | } |
2129 | } |
2130 | |
2131 | int vm_stop(RunState state) |
2132 | { |
2133 | if (qemu_in_vcpu_thread()) { |
2134 | qemu_system_vmstop_request_prepare(); |
2135 | qemu_system_vmstop_request(state); |
2136 | /* |
2137 | * FIXME: should not return to device code in case |
2138 | * vm_stop() has been requested. |
2139 | */ |
2140 | cpu_stop_current(); |
2141 | return 0; |
2142 | } |
2143 | |
2144 | return do_vm_stop(state, true); |
2145 | } |
2146 | |
2147 | /** |
2148 | * Prepare for (re)starting the VM. |
2149 | * Returns -1 if the vCPUs are not to be restarted (e.g. if they are already |
2150 | * running or in case of an error condition), 0 otherwise. |
2151 | */ |
2152 | int vm_prepare_start(void) |
2153 | { |
2154 | RunState requested; |
2155 | |
2156 | qemu_vmstop_requested(&requested); |
2157 | if (runstate_is_running() && requested == RUN_STATE__MAX) { |
2158 | return -1; |
2159 | } |
2160 | |
2161 | /* Ensure that a STOP/RESUME pair of events is emitted if a |
2162 | * vmstop request was pending. The BLOCK_IO_ERROR event, for |
2163 | * example, according to documentation is always followed by |
2164 | * the STOP event. |
2165 | */ |
2166 | if (runstate_is_running()) { |
2167 | qapi_event_send_stop(); |
2168 | qapi_event_send_resume(); |
2169 | return -1; |
2170 | } |
2171 | |
2172 | /* We are sending this now, but the CPUs will be resumed shortly later */ |
2173 | qapi_event_send_resume(); |
2174 | |
2175 | replay_enable_events(); |
2176 | cpu_enable_ticks(); |
2177 | runstate_set(RUN_STATE_RUNNING); |
2178 | vm_state_notify(1, RUN_STATE_RUNNING); |
2179 | return 0; |
2180 | } |
2181 | |
2182 | void vm_start(void) |
2183 | { |
2184 | if (!vm_prepare_start()) { |
2185 | resume_all_vcpus(); |
2186 | } |
2187 | } |
2188 | |
2189 | /* does a state transition even if the VM is already stopped, |
2190 | current state is forgotten forever */ |
2191 | int vm_stop_force_state(RunState state) |
2192 | { |
2193 | if (runstate_is_running()) { |
2194 | return vm_stop(state); |
2195 | } else { |
2196 | runstate_set(state); |
2197 | |
2198 | bdrv_drain_all(); |
2199 | /* Make sure to return an error if the flush in a previous vm_stop() |
2200 | * failed. */ |
2201 | return bdrv_flush_all(); |
2202 | } |
2203 | } |
2204 | |
2205 | void list_cpus(const char *optarg) |
2206 | { |
2207 | /* XXX: implement xxx_cpu_list for targets that still miss it */ |
2208 | #if defined(cpu_list) |
2209 | cpu_list(); |
2210 | #endif |
2211 | } |
2212 | |
2213 | void qmp_memsave(int64_t addr, int64_t size, const char *filename, |
2214 | bool has_cpu, int64_t cpu_index, Error **errp) |
2215 | { |
2216 | FILE *f; |
2217 | uint32_t l; |
2218 | CPUState *cpu; |
2219 | uint8_t buf[1024]; |
2220 | int64_t orig_addr = addr, orig_size = size; |
2221 | |
2222 | if (!has_cpu) { |
2223 | cpu_index = 0; |
2224 | } |
2225 | |
2226 | cpu = qemu_get_cpu(cpu_index); |
2227 | if (cpu == NULL) { |
2228 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index" , |
2229 | "a CPU number" ); |
2230 | return; |
2231 | } |
2232 | |
2233 | f = fopen(filename, "wb" ); |
2234 | if (!f) { |
2235 | error_setg_file_open(errp, errno, filename); |
2236 | return; |
2237 | } |
2238 | |
2239 | while (size != 0) { |
2240 | l = sizeof(buf); |
2241 | if (l > size) |
2242 | l = size; |
2243 | if (cpu_memory_rw_debug(cpu, addr, buf, l, 0) != 0) { |
2244 | error_setg(errp, "Invalid addr 0x%016" PRIx64 "/size %" PRId64 |
2245 | " specified" , orig_addr, orig_size); |
2246 | goto exit; |
2247 | } |
2248 | if (fwrite(buf, 1, l, f) != l) { |
2249 | error_setg(errp, QERR_IO_ERROR); |
2250 | goto exit; |
2251 | } |
2252 | addr += l; |
2253 | size -= l; |
2254 | } |
2255 | |
2256 | exit: |
2257 | fclose(f); |
2258 | } |
2259 | |
2260 | void qmp_pmemsave(int64_t addr, int64_t size, const char *filename, |
2261 | Error **errp) |
2262 | { |
2263 | FILE *f; |
2264 | uint32_t l; |
2265 | uint8_t buf[1024]; |
2266 | |
2267 | f = fopen(filename, "wb" ); |
2268 | if (!f) { |
2269 | error_setg_file_open(errp, errno, filename); |
2270 | return; |
2271 | } |
2272 | |
2273 | while (size != 0) { |
2274 | l = sizeof(buf); |
2275 | if (l > size) |
2276 | l = size; |
2277 | cpu_physical_memory_read(addr, buf, l); |
2278 | if (fwrite(buf, 1, l, f) != l) { |
2279 | error_setg(errp, QERR_IO_ERROR); |
2280 | goto exit; |
2281 | } |
2282 | addr += l; |
2283 | size -= l; |
2284 | } |
2285 | |
2286 | exit: |
2287 | fclose(f); |
2288 | } |
2289 | |
2290 | void qmp_inject_nmi(Error **errp) |
2291 | { |
2292 | nmi_monitor_handle(monitor_get_cpu_index(), errp); |
2293 | } |
2294 | |
2295 | void dump_drift_info(void) |
2296 | { |
2297 | if (!use_icount) { |
2298 | return; |
2299 | } |
2300 | |
2301 | qemu_printf("Host - Guest clock %" PRIi64" ms\n" , |
2302 | (cpu_get_clock() - cpu_get_icount())/SCALE_MS); |
2303 | if (icount_align_option) { |
2304 | qemu_printf("Max guest delay %" PRIi64" ms\n" , |
2305 | -max_delay / SCALE_MS); |
2306 | qemu_printf("Max guest advance %" PRIi64" ms\n" , |
2307 | max_advance / SCALE_MS); |
2308 | } else { |
2309 | qemu_printf("Max guest delay NA\n" ); |
2310 | qemu_printf("Max guest advance NA\n" ); |
2311 | } |
2312 | } |
2313 | |