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1 | /* | |
2 | * QEMU System Emulator | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | ||
25 | /* Needed early for CONFIG_BSD etc. */ | |
26 | #include "qemu/osdep.h" | |
27 | #include "qemu-common.h" | |
28 | #include "qemu/config-file.h" | |
29 | #include "cpu.h" | |
30 | #include "monitor/monitor.h" | |
31 | #include "qapi/qmp/qerror.h" | |
32 | #include "qemu/error-report.h" | |
33 | #include "sysemu/sysemu.h" | |
34 | #include "sysemu/block-backend.h" | |
35 | #include "exec/gdbstub.h" | |
36 | #include "sysemu/dma.h" | |
37 | #include "sysemu/hw_accel.h" | |
38 | #include "sysemu/kvm.h" | |
39 | #include "sysemu/hax.h" | |
40 | #include "qmp-commands.h" | |
41 | #include "exec/exec-all.h" | |
42 | ||
43 | #include "qemu/thread.h" | |
44 | #include "sysemu/cpus.h" | |
45 | #include "sysemu/qtest.h" | |
46 | #include "qemu/main-loop.h" | |
47 | #include "qemu/bitmap.h" | |
48 | #include "qemu/seqlock.h" | |
49 | #include "tcg.h" | |
50 | #include "qapi-event.h" | |
51 | #include "hw/nmi.h" | |
52 | #include "sysemu/replay.h" | |
53 | ||
54 | #ifdef CONFIG_LINUX | |
55 | ||
56 | #include <sys/prctl.h> | |
57 | ||
58 | #ifndef PR_MCE_KILL | |
59 | #define PR_MCE_KILL 33 | |
60 | #endif | |
61 | ||
62 | #ifndef PR_MCE_KILL_SET | |
63 | #define PR_MCE_KILL_SET 1 | |
64 | #endif | |
65 | ||
66 | #ifndef PR_MCE_KILL_EARLY | |
67 | #define PR_MCE_KILL_EARLY 1 | |
68 | #endif | |
69 | ||
70 | #endif /* CONFIG_LINUX */ | |
71 | ||
72 | int64_t max_delay; | |
73 | int64_t max_advance; | |
74 | ||
75 | /* vcpu throttling controls */ | |
76 | static QEMUTimer *throttle_timer; | |
77 | static unsigned int throttle_percentage; | |
78 | ||
79 | #define CPU_THROTTLE_PCT_MIN 1 | |
80 | #define CPU_THROTTLE_PCT_MAX 99 | |
81 | #define CPU_THROTTLE_TIMESLICE_NS 10000000 | |
82 | ||
83 | bool cpu_is_stopped(CPUState *cpu) | |
84 | { | |
85 | return cpu->stopped || !runstate_is_running(); | |
86 | } | |
87 | ||
88 | static bool cpu_thread_is_idle(CPUState *cpu) | |
89 | { | |
90 | if (cpu->stop || cpu->queued_work_first) { | |
91 | return false; | |
92 | } | |
93 | if (cpu_is_stopped(cpu)) { | |
94 | return true; | |
95 | } | |
96 | if (!cpu->halted || cpu_has_work(cpu) || | |
97 | kvm_halt_in_kernel()) { | |
98 | return false; | |
99 | } | |
100 | return true; | |
101 | } | |
102 | ||
103 | static bool all_cpu_threads_idle(void) | |
104 | { | |
105 | CPUState *cpu; | |
106 | ||
107 | CPU_FOREACH(cpu) { | |
108 | if (!cpu_thread_is_idle(cpu)) { | |
109 | return false; | |
110 | } | |
111 | } | |
112 | return true; | |
113 | } | |
114 | ||
115 | /***********************************************************/ | |
116 | /* guest cycle counter */ | |
117 | ||
118 | /* Protected by TimersState seqlock */ | |
119 | ||
120 | static bool icount_sleep = true; | |
121 | static int64_t vm_clock_warp_start = -1; | |
122 | /* Conversion factor from emulated instructions to virtual clock ticks. */ | |
123 | static int icount_time_shift; | |
124 | /* Arbitrarily pick 1MIPS as the minimum allowable speed. */ | |
125 | #define MAX_ICOUNT_SHIFT 10 | |
126 | ||
127 | static QEMUTimer *icount_rt_timer; | |
128 | static QEMUTimer *icount_vm_timer; | |
129 | static QEMUTimer *icount_warp_timer; | |
130 | ||
131 | typedef struct TimersState { | |
132 | /* Protected by BQL. */ | |
133 | int64_t cpu_ticks_prev; | |
134 | int64_t cpu_ticks_offset; | |
135 | ||
136 | /* cpu_clock_offset can be read out of BQL, so protect it with | |
137 | * this lock. | |
138 | */ | |
139 | QemuSeqLock vm_clock_seqlock; | |
140 | int64_t cpu_clock_offset; | |
141 | int32_t cpu_ticks_enabled; | |
142 | int64_t dummy; | |
143 | ||
144 | /* Compensate for varying guest execution speed. */ | |
145 | int64_t qemu_icount_bias; | |
146 | /* Only written by TCG thread */ | |
147 | int64_t qemu_icount; | |
148 | } TimersState; | |
149 | ||
150 | static TimersState timers_state; | |
151 | bool mttcg_enabled; | |
152 | ||
153 | /* | |
154 | * We default to false if we know other options have been enabled | |
155 | * which are currently incompatible with MTTCG. Otherwise when each | |
156 | * guest (target) has been updated to support: | |
157 | * - atomic instructions | |
158 | * - memory ordering primitives (barriers) | |
159 | * they can set the appropriate CONFIG flags in ${target}-softmmu.mak | |
160 | * | |
161 | * Once a guest architecture has been converted to the new primitives | |
162 | * there are two remaining limitations to check. | |
163 | * | |
164 | * - The guest can't be oversized (e.g. 64 bit guest on 32 bit host) | |
165 | * - The host must have a stronger memory order than the guest | |
166 | * | |
167 | * It may be possible in future to support strong guests on weak hosts | |
168 | * but that will require tagging all load/stores in a guest with their | |
169 | * implicit memory order requirements which would likely slow things | |
170 | * down a lot. | |
171 | */ | |
172 | ||
173 | static bool check_tcg_memory_orders_compatible(void) | |
174 | { | |
175 | #if defined(TCG_GUEST_DEFAULT_MO) && defined(TCG_TARGET_DEFAULT_MO) | |
176 | return (TCG_GUEST_DEFAULT_MO & ~TCG_TARGET_DEFAULT_MO) == 0; | |
177 | #else | |
178 | return false; | |
179 | #endif | |
180 | } | |
181 | ||
182 | static bool default_mttcg_enabled(void) | |
183 | { | |
184 | if (use_icount || TCG_OVERSIZED_GUEST) { | |
185 | return false; | |
186 | } else { | |
187 | #ifdef TARGET_SUPPORTS_MTTCG | |
188 | return check_tcg_memory_orders_compatible(); | |
189 | #else | |
190 | return false; | |
191 | #endif | |
192 | } | |
193 | } | |
194 | ||
195 | void qemu_tcg_configure(QemuOpts *opts, Error **errp) | |
196 | { | |
197 | const char *t = qemu_opt_get(opts, "thread"); | |
198 | if (t) { | |
199 | if (strcmp(t, "multi") == 0) { | |
200 | if (TCG_OVERSIZED_GUEST) { | |
201 | error_setg(errp, "No MTTCG when guest word size > hosts"); | |
202 | } else if (use_icount) { | |
203 | error_setg(errp, "No MTTCG when icount is enabled"); | |
204 | } else { | |
205 | #ifndef TARGET_SUPPORTS_MTTCG | |
206 | error_report("Guest not yet converted to MTTCG - " | |
207 | "you may get unexpected results"); | |
208 | #endif | |
209 | if (!check_tcg_memory_orders_compatible()) { | |
210 | error_report("Guest expects a stronger memory ordering " | |
211 | "than the host provides"); | |
212 | error_printf("This may cause strange/hard to debug errors\n"); | |
213 | } | |
214 | mttcg_enabled = true; | |
215 | } | |
216 | } else if (strcmp(t, "single") == 0) { | |
217 | mttcg_enabled = false; | |
218 | } else { | |
219 | error_setg(errp, "Invalid 'thread' setting %s", t); | |
220 | } | |
221 | } else { | |
222 | mttcg_enabled = default_mttcg_enabled(); | |
223 | } | |
224 | } | |
225 | ||
226 | /* The current number of executed instructions is based on what we | |
227 | * originally budgeted minus the current state of the decrementing | |
228 | * icount counters in extra/u16.low. | |
229 | */ | |
230 | static int64_t cpu_get_icount_executed(CPUState *cpu) | |
231 | { | |
232 | return cpu->icount_budget - (cpu->icount_decr.u16.low + cpu->icount_extra); | |
233 | } | |
234 | ||
235 | /* | |
236 | * Update the global shared timer_state.qemu_icount to take into | |
237 | * account executed instructions. This is done by the TCG vCPU | |
238 | * thread so the main-loop can see time has moved forward. | |
239 | */ | |
240 | void cpu_update_icount(CPUState *cpu) | |
241 | { | |
242 | int64_t executed = cpu_get_icount_executed(cpu); | |
243 | cpu->icount_budget -= executed; | |
244 | ||
245 | #ifdef CONFIG_ATOMIC64 | |
246 | atomic_set__nocheck(&timers_state.qemu_icount, | |
247 | atomic_read__nocheck(&timers_state.qemu_icount) + | |
248 | executed); | |
249 | #else /* FIXME: we need 64bit atomics to do this safely */ | |
250 | timers_state.qemu_icount += executed; | |
251 | #endif | |
252 | } | |
253 | ||
254 | int64_t cpu_get_icount_raw(void) | |
255 | { | |
256 | CPUState *cpu = current_cpu; | |
257 | ||
258 | if (cpu && cpu->running) { | |
259 | if (!cpu->can_do_io) { | |
260 | fprintf(stderr, "Bad icount read\n"); | |
261 | exit(1); | |
262 | } | |
263 | /* Take into account what has run */ | |
264 | cpu_update_icount(cpu); | |
265 | } | |
266 | #ifdef CONFIG_ATOMIC64 | |
267 | return atomic_read__nocheck(&timers_state.qemu_icount); | |
268 | #else /* FIXME: we need 64bit atomics to do this safely */ | |
269 | return timers_state.qemu_icount; | |
270 | #endif | |
271 | } | |
272 | ||
273 | /* Return the virtual CPU time, based on the instruction counter. */ | |
274 | static int64_t cpu_get_icount_locked(void) | |
275 | { | |
276 | int64_t icount = cpu_get_icount_raw(); | |
277 | return timers_state.qemu_icount_bias + cpu_icount_to_ns(icount); | |
278 | } | |
279 | ||
280 | int64_t cpu_get_icount(void) | |
281 | { | |
282 | int64_t icount; | |
283 | unsigned start; | |
284 | ||
285 | do { | |
286 | start = seqlock_read_begin(&timers_state.vm_clock_seqlock); | |
287 | icount = cpu_get_icount_locked(); | |
288 | } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, start)); | |
289 | ||
290 | return icount; | |
291 | } | |
292 | ||
293 | int64_t cpu_icount_to_ns(int64_t icount) | |
294 | { | |
295 | return icount << icount_time_shift; | |
296 | } | |
297 | ||
298 | /* return the time elapsed in VM between vm_start and vm_stop. Unless | |
299 | * icount is active, cpu_get_ticks() uses units of the host CPU cycle | |
300 | * counter. | |
301 | * | |
302 | * Caller must hold the BQL | |
303 | */ | |
304 | int64_t cpu_get_ticks(void) | |
305 | { | |
306 | int64_t ticks; | |
307 | ||
308 | if (use_icount) { | |
309 | return cpu_get_icount(); | |
310 | } | |
311 | ||
312 | ticks = timers_state.cpu_ticks_offset; | |
313 | if (timers_state.cpu_ticks_enabled) { | |
314 | ticks += cpu_get_host_ticks(); | |
315 | } | |
316 | ||
317 | if (timers_state.cpu_ticks_prev > ticks) { | |
318 | /* Note: non increasing ticks may happen if the host uses | |
319 | software suspend */ | |
320 | timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks; | |
321 | ticks = timers_state.cpu_ticks_prev; | |
322 | } | |
323 | ||
324 | timers_state.cpu_ticks_prev = ticks; | |
325 | return ticks; | |
326 | } | |
327 | ||
328 | static int64_t cpu_get_clock_locked(void) | |
329 | { | |
330 | int64_t time; | |
331 | ||
332 | time = timers_state.cpu_clock_offset; | |
333 | if (timers_state.cpu_ticks_enabled) { | |
334 | time += get_clock(); | |
335 | } | |
336 | ||
337 | return time; | |
338 | } | |
339 | ||
340 | /* Return the monotonic time elapsed in VM, i.e., | |
341 | * the time between vm_start and vm_stop | |
342 | */ | |
343 | int64_t cpu_get_clock(void) | |
344 | { | |
345 | int64_t ti; | |
346 | unsigned start; | |
347 | ||
348 | do { | |
349 | start = seqlock_read_begin(&timers_state.vm_clock_seqlock); | |
350 | ti = cpu_get_clock_locked(); | |
351 | } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, start)); | |
352 | ||
353 | return ti; | |
354 | } | |
355 | ||
356 | /* enable cpu_get_ticks() | |
357 | * Caller must hold BQL which serves as mutex for vm_clock_seqlock. | |
358 | */ | |
359 | void cpu_enable_ticks(void) | |
360 | { | |
361 | /* Here, the really thing protected by seqlock is cpu_clock_offset. */ | |
362 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
363 | if (!timers_state.cpu_ticks_enabled) { | |
364 | timers_state.cpu_ticks_offset -= cpu_get_host_ticks(); | |
365 | timers_state.cpu_clock_offset -= get_clock(); | |
366 | timers_state.cpu_ticks_enabled = 1; | |
367 | } | |
368 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
369 | } | |
370 | ||
371 | /* disable cpu_get_ticks() : the clock is stopped. You must not call | |
372 | * cpu_get_ticks() after that. | |
373 | * Caller must hold BQL which serves as mutex for vm_clock_seqlock. | |
374 | */ | |
375 | void cpu_disable_ticks(void) | |
376 | { | |
377 | /* Here, the really thing protected by seqlock is cpu_clock_offset. */ | |
378 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
379 | if (timers_state.cpu_ticks_enabled) { | |
380 | timers_state.cpu_ticks_offset += cpu_get_host_ticks(); | |
381 | timers_state.cpu_clock_offset = cpu_get_clock_locked(); | |
382 | timers_state.cpu_ticks_enabled = 0; | |
383 | } | |
384 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
385 | } | |
386 | ||
387 | /* Correlation between real and virtual time is always going to be | |
388 | fairly approximate, so ignore small variation. | |
389 | When the guest is idle real and virtual time will be aligned in | |
390 | the IO wait loop. */ | |
391 | #define ICOUNT_WOBBLE (NANOSECONDS_PER_SECOND / 10) | |
392 | ||
393 | static void icount_adjust(void) | |
394 | { | |
395 | int64_t cur_time; | |
396 | int64_t cur_icount; | |
397 | int64_t delta; | |
398 | ||
399 | /* Protected by TimersState mutex. */ | |
400 | static int64_t last_delta; | |
401 | ||
402 | /* If the VM is not running, then do nothing. */ | |
403 | if (!runstate_is_running()) { | |
404 | return; | |
405 | } | |
406 | ||
407 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
408 | cur_time = cpu_get_clock_locked(); | |
409 | cur_icount = cpu_get_icount_locked(); | |
410 | ||
411 | delta = cur_icount - cur_time; | |
412 | /* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */ | |
413 | if (delta > 0 | |
414 | && last_delta + ICOUNT_WOBBLE < delta * 2 | |
415 | && icount_time_shift > 0) { | |
416 | /* The guest is getting too far ahead. Slow time down. */ | |
417 | icount_time_shift--; | |
418 | } | |
419 | if (delta < 0 | |
420 | && last_delta - ICOUNT_WOBBLE > delta * 2 | |
421 | && icount_time_shift < MAX_ICOUNT_SHIFT) { | |
422 | /* The guest is getting too far behind. Speed time up. */ | |
423 | icount_time_shift++; | |
424 | } | |
425 | last_delta = delta; | |
426 | timers_state.qemu_icount_bias = cur_icount | |
427 | - (timers_state.qemu_icount << icount_time_shift); | |
428 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
429 | } | |
430 | ||
431 | static void icount_adjust_rt(void *opaque) | |
432 | { | |
433 | timer_mod(icount_rt_timer, | |
434 | qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL_RT) + 1000); | |
435 | icount_adjust(); | |
436 | } | |
437 | ||
438 | static void icount_adjust_vm(void *opaque) | |
439 | { | |
440 | timer_mod(icount_vm_timer, | |
441 | qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + | |
442 | NANOSECONDS_PER_SECOND / 10); | |
443 | icount_adjust(); | |
444 | } | |
445 | ||
446 | static int64_t qemu_icount_round(int64_t count) | |
447 | { | |
448 | return (count + (1 << icount_time_shift) - 1) >> icount_time_shift; | |
449 | } | |
450 | ||
451 | static void icount_warp_rt(void) | |
452 | { | |
453 | unsigned seq; | |
454 | int64_t warp_start; | |
455 | ||
456 | /* The icount_warp_timer is rescheduled soon after vm_clock_warp_start | |
457 | * changes from -1 to another value, so the race here is okay. | |
458 | */ | |
459 | do { | |
460 | seq = seqlock_read_begin(&timers_state.vm_clock_seqlock); | |
461 | warp_start = vm_clock_warp_start; | |
462 | } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, seq)); | |
463 | ||
464 | if (warp_start == -1) { | |
465 | return; | |
466 | } | |
467 | ||
468 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
469 | if (runstate_is_running()) { | |
470 | int64_t clock = REPLAY_CLOCK(REPLAY_CLOCK_VIRTUAL_RT, | |
471 | cpu_get_clock_locked()); | |
472 | int64_t warp_delta; | |
473 | ||
474 | warp_delta = clock - vm_clock_warp_start; | |
475 | if (use_icount == 2) { | |
476 | /* | |
477 | * In adaptive mode, do not let QEMU_CLOCK_VIRTUAL run too | |
478 | * far ahead of real time. | |
479 | */ | |
480 | int64_t cur_icount = cpu_get_icount_locked(); | |
481 | int64_t delta = clock - cur_icount; | |
482 | warp_delta = MIN(warp_delta, delta); | |
483 | } | |
484 | timers_state.qemu_icount_bias += warp_delta; | |
485 | } | |
486 | vm_clock_warp_start = -1; | |
487 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
488 | ||
489 | if (qemu_clock_expired(QEMU_CLOCK_VIRTUAL)) { | |
490 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); | |
491 | } | |
492 | } | |
493 | ||
494 | static void icount_timer_cb(void *opaque) | |
495 | { | |
496 | /* No need for a checkpoint because the timer already synchronizes | |
497 | * with CHECKPOINT_CLOCK_VIRTUAL_RT. | |
498 | */ | |
499 | icount_warp_rt(); | |
500 | } | |
501 | ||
502 | void qtest_clock_warp(int64_t dest) | |
503 | { | |
504 | int64_t clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); | |
505 | AioContext *aio_context; | |
506 | assert(qtest_enabled()); | |
507 | aio_context = qemu_get_aio_context(); | |
508 | while (clock < dest) { | |
509 | int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL); | |
510 | int64_t warp = qemu_soonest_timeout(dest - clock, deadline); | |
511 | ||
512 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
513 | timers_state.qemu_icount_bias += warp; | |
514 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
515 | ||
516 | qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL); | |
517 | timerlist_run_timers(aio_context->tlg.tl[QEMU_CLOCK_VIRTUAL]); | |
518 | clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); | |
519 | } | |
520 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); | |
521 | } | |
522 | ||
523 | void qemu_start_warp_timer(void) | |
524 | { | |
525 | int64_t clock; | |
526 | int64_t deadline; | |
527 | ||
528 | if (!use_icount) { | |
529 | return; | |
530 | } | |
531 | ||
532 | /* Nothing to do if the VM is stopped: QEMU_CLOCK_VIRTUAL timers | |
533 | * do not fire, so computing the deadline does not make sense. | |
534 | */ | |
535 | if (!runstate_is_running()) { | |
536 | return; | |
537 | } | |
538 | ||
539 | /* warp clock deterministically in record/replay mode */ | |
540 | if (!replay_checkpoint(CHECKPOINT_CLOCK_WARP_START)) { | |
541 | return; | |
542 | } | |
543 | ||
544 | if (!all_cpu_threads_idle()) { | |
545 | return; | |
546 | } | |
547 | ||
548 | if (qtest_enabled()) { | |
549 | /* When testing, qtest commands advance icount. */ | |
550 | return; | |
551 | } | |
552 | ||
553 | /* We want to use the earliest deadline from ALL vm_clocks */ | |
554 | clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT); | |
555 | deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL); | |
556 | if (deadline < 0) { | |
557 | static bool notified; | |
558 | if (!icount_sleep && !notified) { | |
559 | error_report("WARNING: icount sleep disabled and no active timers"); | |
560 | notified = true; | |
561 | } | |
562 | return; | |
563 | } | |
564 | ||
565 | if (deadline > 0) { | |
566 | /* | |
567 | * Ensure QEMU_CLOCK_VIRTUAL proceeds even when the virtual CPU goes to | |
568 | * sleep. Otherwise, the CPU might be waiting for a future timer | |
569 | * interrupt to wake it up, but the interrupt never comes because | |
570 | * the vCPU isn't running any insns and thus doesn't advance the | |
571 | * QEMU_CLOCK_VIRTUAL. | |
572 | */ | |
573 | if (!icount_sleep) { | |
574 | /* | |
575 | * We never let VCPUs sleep in no sleep icount mode. | |
576 | * If there is a pending QEMU_CLOCK_VIRTUAL timer we just advance | |
577 | * to the next QEMU_CLOCK_VIRTUAL event and notify it. | |
578 | * It is useful when we want a deterministic execution time, | |
579 | * isolated from host latencies. | |
580 | */ | |
581 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
582 | timers_state.qemu_icount_bias += deadline; | |
583 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
584 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); | |
585 | } else { | |
586 | /* | |
587 | * We do stop VCPUs and only advance QEMU_CLOCK_VIRTUAL after some | |
588 | * "real" time, (related to the time left until the next event) has | |
589 | * passed. The QEMU_CLOCK_VIRTUAL_RT clock will do this. | |
590 | * This avoids that the warps are visible externally; for example, | |
591 | * you will not be sending network packets continuously instead of | |
592 | * every 100ms. | |
593 | */ | |
594 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
595 | if (vm_clock_warp_start == -1 || vm_clock_warp_start > clock) { | |
596 | vm_clock_warp_start = clock; | |
597 | } | |
598 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
599 | timer_mod_anticipate(icount_warp_timer, clock + deadline); | |
600 | } | |
601 | } else if (deadline == 0) { | |
602 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); | |
603 | } | |
604 | } | |
605 | ||
606 | static void qemu_account_warp_timer(void) | |
607 | { | |
608 | if (!use_icount || !icount_sleep) { | |
609 | return; | |
610 | } | |
611 | ||
612 | /* Nothing to do if the VM is stopped: QEMU_CLOCK_VIRTUAL timers | |
613 | * do not fire, so computing the deadline does not make sense. | |
614 | */ | |
615 | if (!runstate_is_running()) { | |
616 | return; | |
617 | } | |
618 | ||
619 | /* warp clock deterministically in record/replay mode */ | |
620 | if (!replay_checkpoint(CHECKPOINT_CLOCK_WARP_ACCOUNT)) { | |
621 | return; | |
622 | } | |
623 | ||
624 | timer_del(icount_warp_timer); | |
625 | icount_warp_rt(); | |
626 | } | |
627 | ||
628 | static bool icount_state_needed(void *opaque) | |
629 | { | |
630 | return use_icount; | |
631 | } | |
632 | ||
633 | /* | |
634 | * This is a subsection for icount migration. | |
635 | */ | |
636 | static const VMStateDescription icount_vmstate_timers = { | |
637 | .name = "timer/icount", | |
638 | .version_id = 1, | |
639 | .minimum_version_id = 1, | |
640 | .needed = icount_state_needed, | |
641 | .fields = (VMStateField[]) { | |
642 | VMSTATE_INT64(qemu_icount_bias, TimersState), | |
643 | VMSTATE_INT64(qemu_icount, TimersState), | |
644 | VMSTATE_END_OF_LIST() | |
645 | } | |
646 | }; | |
647 | ||
648 | static const VMStateDescription vmstate_timers = { | |
649 | .name = "timer", | |
650 | .version_id = 2, | |
651 | .minimum_version_id = 1, | |
652 | .fields = (VMStateField[]) { | |
653 | VMSTATE_INT64(cpu_ticks_offset, TimersState), | |
654 | VMSTATE_INT64(dummy, TimersState), | |
655 | VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2), | |
656 | VMSTATE_END_OF_LIST() | |
657 | }, | |
658 | .subsections = (const VMStateDescription*[]) { | |
659 | &icount_vmstate_timers, | |
660 | NULL | |
661 | } | |
662 | }; | |
663 | ||
664 | static void cpu_throttle_thread(CPUState *cpu, run_on_cpu_data opaque) | |
665 | { | |
666 | double pct; | |
667 | double throttle_ratio; | |
668 | long sleeptime_ns; | |
669 | ||
670 | if (!cpu_throttle_get_percentage()) { | |
671 | return; | |
672 | } | |
673 | ||
674 | pct = (double)cpu_throttle_get_percentage()/100; | |
675 | throttle_ratio = pct / (1 - pct); | |
676 | sleeptime_ns = (long)(throttle_ratio * CPU_THROTTLE_TIMESLICE_NS); | |
677 | ||
678 | qemu_mutex_unlock_iothread(); | |
679 | atomic_set(&cpu->throttle_thread_scheduled, 0); | |
680 | g_usleep(sleeptime_ns / 1000); /* Convert ns to us for usleep call */ | |
681 | qemu_mutex_lock_iothread(); | |
682 | } | |
683 | ||
684 | static void cpu_throttle_timer_tick(void *opaque) | |
685 | { | |
686 | CPUState *cpu; | |
687 | double pct; | |
688 | ||
689 | /* Stop the timer if needed */ | |
690 | if (!cpu_throttle_get_percentage()) { | |
691 | return; | |
692 | } | |
693 | CPU_FOREACH(cpu) { | |
694 | if (!atomic_xchg(&cpu->throttle_thread_scheduled, 1)) { | |
695 | async_run_on_cpu(cpu, cpu_throttle_thread, | |
696 | RUN_ON_CPU_NULL); | |
697 | } | |
698 | } | |
699 | ||
700 | pct = (double)cpu_throttle_get_percentage()/100; | |
701 | timer_mod(throttle_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT) + | |
702 | CPU_THROTTLE_TIMESLICE_NS / (1-pct)); | |
703 | } | |
704 | ||
705 | void cpu_throttle_set(int new_throttle_pct) | |
706 | { | |
707 | /* Ensure throttle percentage is within valid range */ | |
708 | new_throttle_pct = MIN(new_throttle_pct, CPU_THROTTLE_PCT_MAX); | |
709 | new_throttle_pct = MAX(new_throttle_pct, CPU_THROTTLE_PCT_MIN); | |
710 | ||
711 | atomic_set(&throttle_percentage, new_throttle_pct); | |
712 | ||
713 | timer_mod(throttle_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT) + | |
714 | CPU_THROTTLE_TIMESLICE_NS); | |
715 | } | |
716 | ||
717 | void cpu_throttle_stop(void) | |
718 | { | |
719 | atomic_set(&throttle_percentage, 0); | |
720 | } | |
721 | ||
722 | bool cpu_throttle_active(void) | |
723 | { | |
724 | return (cpu_throttle_get_percentage() != 0); | |
725 | } | |
726 | ||
727 | int cpu_throttle_get_percentage(void) | |
728 | { | |
729 | return atomic_read(&throttle_percentage); | |
730 | } | |
731 | ||
732 | void cpu_ticks_init(void) | |
733 | { | |
734 | seqlock_init(&timers_state.vm_clock_seqlock); | |
735 | vmstate_register(NULL, 0, &vmstate_timers, &timers_state); | |
736 | throttle_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT, | |
737 | cpu_throttle_timer_tick, NULL); | |
738 | } | |
739 | ||
740 | void configure_icount(QemuOpts *opts, Error **errp) | |
741 | { | |
742 | const char *option; | |
743 | char *rem_str = NULL; | |
744 | ||
745 | option = qemu_opt_get(opts, "shift"); | |
746 | if (!option) { | |
747 | if (qemu_opt_get(opts, "align") != NULL) { | |
748 | error_setg(errp, "Please specify shift option when using align"); | |
749 | } | |
750 | return; | |
751 | } | |
752 | ||
753 | icount_sleep = qemu_opt_get_bool(opts, "sleep", true); | |
754 | if (icount_sleep) { | |
755 | icount_warp_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT, | |
756 | icount_timer_cb, NULL); | |
757 | } | |
758 | ||
759 | icount_align_option = qemu_opt_get_bool(opts, "align", false); | |
760 | ||
761 | if (icount_align_option && !icount_sleep) { | |
762 | error_setg(errp, "align=on and sleep=off are incompatible"); | |
763 | } | |
764 | if (strcmp(option, "auto") != 0) { | |
765 | errno = 0; | |
766 | icount_time_shift = strtol(option, &rem_str, 0); | |
767 | if (errno != 0 || *rem_str != '\0' || !strlen(option)) { | |
768 | error_setg(errp, "icount: Invalid shift value"); | |
769 | } | |
770 | use_icount = 1; | |
771 | return; | |
772 | } else if (icount_align_option) { | |
773 | error_setg(errp, "shift=auto and align=on are incompatible"); | |
774 | } else if (!icount_sleep) { | |
775 | error_setg(errp, "shift=auto and sleep=off are incompatible"); | |
776 | } | |
777 | ||
778 | use_icount = 2; | |
779 | ||
780 | /* 125MIPS seems a reasonable initial guess at the guest speed. | |
781 | It will be corrected fairly quickly anyway. */ | |
782 | icount_time_shift = 3; | |
783 | ||
784 | /* Have both realtime and virtual time triggers for speed adjustment. | |
785 | The realtime trigger catches emulated time passing too slowly, | |
786 | the virtual time trigger catches emulated time passing too fast. | |
787 | Realtime triggers occur even when idle, so use them less frequently | |
788 | than VM triggers. */ | |
789 | icount_rt_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL_RT, | |
790 | icount_adjust_rt, NULL); | |
791 | timer_mod(icount_rt_timer, | |
792 | qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL_RT) + 1000); | |
793 | icount_vm_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, | |
794 | icount_adjust_vm, NULL); | |
795 | timer_mod(icount_vm_timer, | |
796 | qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + | |
797 | NANOSECONDS_PER_SECOND / 10); | |
798 | } | |
799 | ||
800 | /***********************************************************/ | |
801 | /* TCG vCPU kick timer | |
802 | * | |
803 | * The kick timer is responsible for moving single threaded vCPU | |
804 | * emulation on to the next vCPU. If more than one vCPU is running a | |
805 | * timer event with force a cpu->exit so the next vCPU can get | |
806 | * scheduled. | |
807 | * | |
808 | * The timer is removed if all vCPUs are idle and restarted again once | |
809 | * idleness is complete. | |
810 | */ | |
811 | ||
812 | static QEMUTimer *tcg_kick_vcpu_timer; | |
813 | static CPUState *tcg_current_rr_cpu; | |
814 | ||
815 | #define TCG_KICK_PERIOD (NANOSECONDS_PER_SECOND / 10) | |
816 | ||
817 | static inline int64_t qemu_tcg_next_kick(void) | |
818 | { | |
819 | return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + TCG_KICK_PERIOD; | |
820 | } | |
821 | ||
822 | /* Kick the currently round-robin scheduled vCPU */ | |
823 | static void qemu_cpu_kick_rr_cpu(void) | |
824 | { | |
825 | CPUState *cpu; | |
826 | do { | |
827 | cpu = atomic_mb_read(&tcg_current_rr_cpu); | |
828 | if (cpu) { | |
829 | cpu_exit(cpu); | |
830 | } | |
831 | } while (cpu != atomic_mb_read(&tcg_current_rr_cpu)); | |
832 | } | |
833 | ||
834 | static void do_nothing(CPUState *cpu, run_on_cpu_data unused) | |
835 | { | |
836 | } | |
837 | ||
838 | void qemu_timer_notify_cb(void *opaque, QEMUClockType type) | |
839 | { | |
840 | if (!use_icount || type != QEMU_CLOCK_VIRTUAL) { | |
841 | qemu_notify_event(); | |
842 | return; | |
843 | } | |
844 | ||
845 | if (!qemu_in_vcpu_thread() && first_cpu) { | |
846 | /* qemu_cpu_kick is not enough to kick a halted CPU out of | |
847 | * qemu_tcg_wait_io_event. async_run_on_cpu, instead, | |
848 | * causes cpu_thread_is_idle to return false. This way, | |
849 | * handle_icount_deadline can run. | |
850 | */ | |
851 | async_run_on_cpu(first_cpu, do_nothing, RUN_ON_CPU_NULL); | |
852 | } | |
853 | } | |
854 | ||
855 | static void kick_tcg_thread(void *opaque) | |
856 | { | |
857 | timer_mod(tcg_kick_vcpu_timer, qemu_tcg_next_kick()); | |
858 | qemu_cpu_kick_rr_cpu(); | |
859 | } | |
860 | ||
861 | static void start_tcg_kick_timer(void) | |
862 | { | |
863 | if (!mttcg_enabled && !tcg_kick_vcpu_timer && CPU_NEXT(first_cpu)) { | |
864 | tcg_kick_vcpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, | |
865 | kick_tcg_thread, NULL); | |
866 | timer_mod(tcg_kick_vcpu_timer, qemu_tcg_next_kick()); | |
867 | } | |
868 | } | |
869 | ||
870 | static void stop_tcg_kick_timer(void) | |
871 | { | |
872 | if (tcg_kick_vcpu_timer) { | |
873 | timer_del(tcg_kick_vcpu_timer); | |
874 | tcg_kick_vcpu_timer = NULL; | |
875 | } | |
876 | } | |
877 | ||
878 | /***********************************************************/ | |
879 | void hw_error(const char *fmt, ...) | |
880 | { | |
881 | va_list ap; | |
882 | CPUState *cpu; | |
883 | ||
884 | va_start(ap, fmt); | |
885 | fprintf(stderr, "qemu: hardware error: "); | |
886 | vfprintf(stderr, fmt, ap); | |
887 | fprintf(stderr, "\n"); | |
888 | CPU_FOREACH(cpu) { | |
889 | fprintf(stderr, "CPU #%d:\n", cpu->cpu_index); | |
890 | cpu_dump_state(cpu, stderr, fprintf, CPU_DUMP_FPU); | |
891 | } | |
892 | va_end(ap); | |
893 | abort(); | |
894 | } | |
895 | ||
896 | void cpu_synchronize_all_states(void) | |
897 | { | |
898 | CPUState *cpu; | |
899 | ||
900 | CPU_FOREACH(cpu) { | |
901 | cpu_synchronize_state(cpu); | |
902 | } | |
903 | } | |
904 | ||
905 | void cpu_synchronize_all_post_reset(void) | |
906 | { | |
907 | CPUState *cpu; | |
908 | ||
909 | CPU_FOREACH(cpu) { | |
910 | cpu_synchronize_post_reset(cpu); | |
911 | } | |
912 | } | |
913 | ||
914 | void cpu_synchronize_all_post_init(void) | |
915 | { | |
916 | CPUState *cpu; | |
917 | ||
918 | CPU_FOREACH(cpu) { | |
919 | cpu_synchronize_post_init(cpu); | |
920 | } | |
921 | } | |
922 | ||
923 | static int do_vm_stop(RunState state) | |
924 | { | |
925 | int ret = 0; | |
926 | ||
927 | if (runstate_is_running()) { | |
928 | cpu_disable_ticks(); | |
929 | pause_all_vcpus(); | |
930 | runstate_set(state); | |
931 | vm_state_notify(0, state); | |
932 | qapi_event_send_stop(&error_abort); | |
933 | } | |
934 | ||
935 | bdrv_drain_all(); | |
936 | replay_disable_events(); | |
937 | ret = bdrv_flush_all(); | |
938 | ||
939 | return ret; | |
940 | } | |
941 | ||
942 | static bool cpu_can_run(CPUState *cpu) | |
943 | { | |
944 | if (cpu->stop) { | |
945 | return false; | |
946 | } | |
947 | if (cpu_is_stopped(cpu)) { | |
948 | return false; | |
949 | } | |
950 | return true; | |
951 | } | |
952 | ||
953 | static void cpu_handle_guest_debug(CPUState *cpu) | |
954 | { | |
955 | gdb_set_stop_cpu(cpu); | |
956 | qemu_system_debug_request(); | |
957 | cpu->stopped = true; | |
958 | } | |
959 | ||
960 | #ifdef CONFIG_LINUX | |
961 | static void sigbus_reraise(void) | |
962 | { | |
963 | sigset_t set; | |
964 | struct sigaction action; | |
965 | ||
966 | memset(&action, 0, sizeof(action)); | |
967 | action.sa_handler = SIG_DFL; | |
968 | if (!sigaction(SIGBUS, &action, NULL)) { | |
969 | raise(SIGBUS); | |
970 | sigemptyset(&set); | |
971 | sigaddset(&set, SIGBUS); | |
972 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); | |
973 | } | |
974 | perror("Failed to re-raise SIGBUS!\n"); | |
975 | abort(); | |
976 | } | |
977 | ||
978 | static void sigbus_handler(int n, siginfo_t *siginfo, void *ctx) | |
979 | { | |
980 | if (siginfo->si_code != BUS_MCEERR_AO && siginfo->si_code != BUS_MCEERR_AR) { | |
981 | sigbus_reraise(); | |
982 | } | |
983 | ||
984 | if (current_cpu) { | |
985 | /* Called asynchronously in VCPU thread. */ | |
986 | if (kvm_on_sigbus_vcpu(current_cpu, siginfo->si_code, siginfo->si_addr)) { | |
987 | sigbus_reraise(); | |
988 | } | |
989 | } else { | |
990 | /* Called synchronously (via signalfd) in main thread. */ | |
991 | if (kvm_on_sigbus(siginfo->si_code, siginfo->si_addr)) { | |
992 | sigbus_reraise(); | |
993 | } | |
994 | } | |
995 | } | |
996 | ||
997 | static void qemu_init_sigbus(void) | |
998 | { | |
999 | struct sigaction action; | |
1000 | ||
1001 | memset(&action, 0, sizeof(action)); | |
1002 | action.sa_flags = SA_SIGINFO; | |
1003 | action.sa_sigaction = sigbus_handler; | |
1004 | sigaction(SIGBUS, &action, NULL); | |
1005 | ||
1006 | prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0); | |
1007 | } | |
1008 | #else /* !CONFIG_LINUX */ | |
1009 | static void qemu_init_sigbus(void) | |
1010 | { | |
1011 | } | |
1012 | #endif /* !CONFIG_LINUX */ | |
1013 | ||
1014 | static QemuMutex qemu_global_mutex; | |
1015 | ||
1016 | static QemuThread io_thread; | |
1017 | ||
1018 | /* cpu creation */ | |
1019 | static QemuCond qemu_cpu_cond; | |
1020 | /* system init */ | |
1021 | static QemuCond qemu_pause_cond; | |
1022 | ||
1023 | void qemu_init_cpu_loop(void) | |
1024 | { | |
1025 | qemu_init_sigbus(); | |
1026 | qemu_cond_init(&qemu_cpu_cond); | |
1027 | qemu_cond_init(&qemu_pause_cond); | |
1028 | qemu_mutex_init(&qemu_global_mutex); | |
1029 | ||
1030 | qemu_thread_get_self(&io_thread); | |
1031 | } | |
1032 | ||
1033 | void run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data) | |
1034 | { | |
1035 | do_run_on_cpu(cpu, func, data, &qemu_global_mutex); | |
1036 | } | |
1037 | ||
1038 | static void qemu_kvm_destroy_vcpu(CPUState *cpu) | |
1039 | { | |
1040 | if (kvm_destroy_vcpu(cpu) < 0) { | |
1041 | error_report("kvm_destroy_vcpu failed"); | |
1042 | exit(EXIT_FAILURE); | |
1043 | } | |
1044 | } | |
1045 | ||
1046 | static void qemu_tcg_destroy_vcpu(CPUState *cpu) | |
1047 | { | |
1048 | } | |
1049 | ||
1050 | static void qemu_wait_io_event_common(CPUState *cpu) | |
1051 | { | |
1052 | atomic_mb_set(&cpu->thread_kicked, false); | |
1053 | if (cpu->stop) { | |
1054 | cpu->stop = false; | |
1055 | cpu->stopped = true; | |
1056 | qemu_cond_broadcast(&qemu_pause_cond); | |
1057 | } | |
1058 | process_queued_cpu_work(cpu); | |
1059 | } | |
1060 | ||
1061 | static bool qemu_tcg_should_sleep(CPUState *cpu) | |
1062 | { | |
1063 | if (mttcg_enabled) { | |
1064 | return cpu_thread_is_idle(cpu); | |
1065 | } else { | |
1066 | return all_cpu_threads_idle(); | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | static void qemu_tcg_wait_io_event(CPUState *cpu) | |
1071 | { | |
1072 | while (qemu_tcg_should_sleep(cpu)) { | |
1073 | stop_tcg_kick_timer(); | |
1074 | qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex); | |
1075 | } | |
1076 | ||
1077 | start_tcg_kick_timer(); | |
1078 | ||
1079 | qemu_wait_io_event_common(cpu); | |
1080 | } | |
1081 | ||
1082 | static void qemu_kvm_wait_io_event(CPUState *cpu) | |
1083 | { | |
1084 | while (cpu_thread_is_idle(cpu)) { | |
1085 | qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex); | |
1086 | } | |
1087 | ||
1088 | qemu_wait_io_event_common(cpu); | |
1089 | } | |
1090 | ||
1091 | static void *qemu_kvm_cpu_thread_fn(void *arg) | |
1092 | { | |
1093 | CPUState *cpu = arg; | |
1094 | int r; | |
1095 | ||
1096 | rcu_register_thread(); | |
1097 | ||
1098 | qemu_mutex_lock_iothread(); | |
1099 | qemu_thread_get_self(cpu->thread); | |
1100 | cpu->thread_id = qemu_get_thread_id(); | |
1101 | cpu->can_do_io = 1; | |
1102 | current_cpu = cpu; | |
1103 | ||
1104 | r = kvm_init_vcpu(cpu); | |
1105 | if (r < 0) { | |
1106 | fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r)); | |
1107 | exit(1); | |
1108 | } | |
1109 | ||
1110 | kvm_init_cpu_signals(cpu); | |
1111 | ||
1112 | /* signal CPU creation */ | |
1113 | cpu->created = true; | |
1114 | qemu_cond_signal(&qemu_cpu_cond); | |
1115 | ||
1116 | do { | |
1117 | if (cpu_can_run(cpu)) { | |
1118 | r = kvm_cpu_exec(cpu); | |
1119 | if (r == EXCP_DEBUG) { | |
1120 | cpu_handle_guest_debug(cpu); | |
1121 | } | |
1122 | } | |
1123 | qemu_kvm_wait_io_event(cpu); | |
1124 | } while (!cpu->unplug || cpu_can_run(cpu)); | |
1125 | ||
1126 | qemu_kvm_destroy_vcpu(cpu); | |
1127 | cpu->created = false; | |
1128 | qemu_cond_signal(&qemu_cpu_cond); | |
1129 | qemu_mutex_unlock_iothread(); | |
1130 | return NULL; | |
1131 | } | |
1132 | ||
1133 | static void *qemu_dummy_cpu_thread_fn(void *arg) | |
1134 | { | |
1135 | #ifdef _WIN32 | |
1136 | fprintf(stderr, "qtest is not supported under Windows\n"); | |
1137 | exit(1); | |
1138 | #else | |
1139 | CPUState *cpu = arg; | |
1140 | sigset_t waitset; | |
1141 | int r; | |
1142 | ||
1143 | rcu_register_thread(); | |
1144 | ||
1145 | qemu_mutex_lock_iothread(); | |
1146 | qemu_thread_get_self(cpu->thread); | |
1147 | cpu->thread_id = qemu_get_thread_id(); | |
1148 | cpu->can_do_io = 1; | |
1149 | current_cpu = cpu; | |
1150 | ||
1151 | sigemptyset(&waitset); | |
1152 | sigaddset(&waitset, SIG_IPI); | |
1153 | ||
1154 | /* signal CPU creation */ | |
1155 | cpu->created = true; | |
1156 | qemu_cond_signal(&qemu_cpu_cond); | |
1157 | ||
1158 | while (1) { | |
1159 | qemu_mutex_unlock_iothread(); | |
1160 | do { | |
1161 | int sig; | |
1162 | r = sigwait(&waitset, &sig); | |
1163 | } while (r == -1 && (errno == EAGAIN || errno == EINTR)); | |
1164 | if (r == -1) { | |
1165 | perror("sigwait"); | |
1166 | exit(1); | |
1167 | } | |
1168 | qemu_mutex_lock_iothread(); | |
1169 | qemu_wait_io_event_common(cpu); | |
1170 | } | |
1171 | ||
1172 | return NULL; | |
1173 | #endif | |
1174 | } | |
1175 | ||
1176 | static int64_t tcg_get_icount_limit(void) | |
1177 | { | |
1178 | int64_t deadline; | |
1179 | ||
1180 | if (replay_mode != REPLAY_MODE_PLAY) { | |
1181 | deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL); | |
1182 | ||
1183 | /* Maintain prior (possibly buggy) behaviour where if no deadline | |
1184 | * was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than | |
1185 | * INT32_MAX nanoseconds ahead, we still use INT32_MAX | |
1186 | * nanoseconds. | |
1187 | */ | |
1188 | if ((deadline < 0) || (deadline > INT32_MAX)) { | |
1189 | deadline = INT32_MAX; | |
1190 | } | |
1191 | ||
1192 | return qemu_icount_round(deadline); | |
1193 | } else { | |
1194 | return replay_get_instructions(); | |
1195 | } | |
1196 | } | |
1197 | ||
1198 | static void handle_icount_deadline(void) | |
1199 | { | |
1200 | assert(qemu_in_vcpu_thread()); | |
1201 | if (use_icount) { | |
1202 | int64_t deadline = | |
1203 | qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL); | |
1204 | ||
1205 | if (deadline == 0) { | |
1206 | /* Wake up other AioContexts. */ | |
1207 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); | |
1208 | qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL); | |
1209 | } | |
1210 | } | |
1211 | } | |
1212 | ||
1213 | static void prepare_icount_for_run(CPUState *cpu) | |
1214 | { | |
1215 | if (use_icount) { | |
1216 | int insns_left; | |
1217 | ||
1218 | /* These should always be cleared by process_icount_data after | |
1219 | * each vCPU execution. However u16.high can be raised | |
1220 | * asynchronously by cpu_exit/cpu_interrupt/tcg_handle_interrupt | |
1221 | */ | |
1222 | g_assert(cpu->icount_decr.u16.low == 0); | |
1223 | g_assert(cpu->icount_extra == 0); | |
1224 | ||
1225 | cpu->icount_budget = tcg_get_icount_limit(); | |
1226 | insns_left = MIN(0xffff, cpu->icount_budget); | |
1227 | cpu->icount_decr.u16.low = insns_left; | |
1228 | cpu->icount_extra = cpu->icount_budget - insns_left; | |
1229 | } | |
1230 | } | |
1231 | ||
1232 | static void process_icount_data(CPUState *cpu) | |
1233 | { | |
1234 | if (use_icount) { | |
1235 | /* Account for executed instructions */ | |
1236 | cpu_update_icount(cpu); | |
1237 | ||
1238 | /* Reset the counters */ | |
1239 | cpu->icount_decr.u16.low = 0; | |
1240 | cpu->icount_extra = 0; | |
1241 | cpu->icount_budget = 0; | |
1242 | ||
1243 | replay_account_executed_instructions(); | |
1244 | } | |
1245 | } | |
1246 | ||
1247 | ||
1248 | static int tcg_cpu_exec(CPUState *cpu) | |
1249 | { | |
1250 | int ret; | |
1251 | #ifdef CONFIG_PROFILER | |
1252 | int64_t ti; | |
1253 | #endif | |
1254 | ||
1255 | #ifdef CONFIG_PROFILER | |
1256 | ti = profile_getclock(); | |
1257 | #endif | |
1258 | qemu_mutex_unlock_iothread(); | |
1259 | cpu_exec_start(cpu); | |
1260 | ret = cpu_exec(cpu); | |
1261 | cpu_exec_end(cpu); | |
1262 | qemu_mutex_lock_iothread(); | |
1263 | #ifdef CONFIG_PROFILER | |
1264 | tcg_time += profile_getclock() - ti; | |
1265 | #endif | |
1266 | return ret; | |
1267 | } | |
1268 | ||
1269 | /* Destroy any remaining vCPUs which have been unplugged and have | |
1270 | * finished running | |
1271 | */ | |
1272 | static void deal_with_unplugged_cpus(void) | |
1273 | { | |
1274 | CPUState *cpu; | |
1275 | ||
1276 | CPU_FOREACH(cpu) { | |
1277 | if (cpu->unplug && !cpu_can_run(cpu)) { | |
1278 | qemu_tcg_destroy_vcpu(cpu); | |
1279 | cpu->created = false; | |
1280 | qemu_cond_signal(&qemu_cpu_cond); | |
1281 | break; | |
1282 | } | |
1283 | } | |
1284 | } | |
1285 | ||
1286 | /* Single-threaded TCG | |
1287 | * | |
1288 | * In the single-threaded case each vCPU is simulated in turn. If | |
1289 | * there is more than a single vCPU we create a simple timer to kick | |
1290 | * the vCPU and ensure we don't get stuck in a tight loop in one vCPU. | |
1291 | * This is done explicitly rather than relying on side-effects | |
1292 | * elsewhere. | |
1293 | */ | |
1294 | ||
1295 | static void *qemu_tcg_rr_cpu_thread_fn(void *arg) | |
1296 | { | |
1297 | CPUState *cpu = arg; | |
1298 | ||
1299 | rcu_register_thread(); | |
1300 | ||
1301 | qemu_mutex_lock_iothread(); | |
1302 | qemu_thread_get_self(cpu->thread); | |
1303 | ||
1304 | CPU_FOREACH(cpu) { | |
1305 | cpu->thread_id = qemu_get_thread_id(); | |
1306 | cpu->created = true; | |
1307 | cpu->can_do_io = 1; | |
1308 | } | |
1309 | qemu_cond_signal(&qemu_cpu_cond); | |
1310 | ||
1311 | /* wait for initial kick-off after machine start */ | |
1312 | while (first_cpu->stopped) { | |
1313 | qemu_cond_wait(first_cpu->halt_cond, &qemu_global_mutex); | |
1314 | ||
1315 | /* process any pending work */ | |
1316 | CPU_FOREACH(cpu) { | |
1317 | current_cpu = cpu; | |
1318 | qemu_wait_io_event_common(cpu); | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | start_tcg_kick_timer(); | |
1323 | ||
1324 | cpu = first_cpu; | |
1325 | ||
1326 | /* process any pending work */ | |
1327 | cpu->exit_request = 1; | |
1328 | ||
1329 | while (1) { | |
1330 | /* Account partial waits to QEMU_CLOCK_VIRTUAL. */ | |
1331 | qemu_account_warp_timer(); | |
1332 | ||
1333 | /* Run the timers here. This is much more efficient than | |
1334 | * waking up the I/O thread and waiting for completion. | |
1335 | */ | |
1336 | handle_icount_deadline(); | |
1337 | ||
1338 | if (!cpu) { | |
1339 | cpu = first_cpu; | |
1340 | } | |
1341 | ||
1342 | while (cpu && !cpu->queued_work_first && !cpu->exit_request) { | |
1343 | ||
1344 | atomic_mb_set(&tcg_current_rr_cpu, cpu); | |
1345 | current_cpu = cpu; | |
1346 | ||
1347 | qemu_clock_enable(QEMU_CLOCK_VIRTUAL, | |
1348 | (cpu->singlestep_enabled & SSTEP_NOTIMER) == 0); | |
1349 | ||
1350 | if (cpu_can_run(cpu)) { | |
1351 | int r; | |
1352 | ||
1353 | prepare_icount_for_run(cpu); | |
1354 | ||
1355 | r = tcg_cpu_exec(cpu); | |
1356 | ||
1357 | process_icount_data(cpu); | |
1358 | ||
1359 | if (r == EXCP_DEBUG) { | |
1360 | cpu_handle_guest_debug(cpu); | |
1361 | break; | |
1362 | } else if (r == EXCP_ATOMIC) { | |
1363 | qemu_mutex_unlock_iothread(); | |
1364 | cpu_exec_step_atomic(cpu); | |
1365 | qemu_mutex_lock_iothread(); | |
1366 | break; | |
1367 | } | |
1368 | } else if (cpu->stop) { | |
1369 | if (cpu->unplug) { | |
1370 | cpu = CPU_NEXT(cpu); | |
1371 | } | |
1372 | break; | |
1373 | } | |
1374 | ||
1375 | cpu = CPU_NEXT(cpu); | |
1376 | } /* while (cpu && !cpu->exit_request).. */ | |
1377 | ||
1378 | /* Does not need atomic_mb_set because a spurious wakeup is okay. */ | |
1379 | atomic_set(&tcg_current_rr_cpu, NULL); | |
1380 | ||
1381 | if (cpu && cpu->exit_request) { | |
1382 | atomic_mb_set(&cpu->exit_request, 0); | |
1383 | } | |
1384 | ||
1385 | qemu_tcg_wait_io_event(cpu ? cpu : QTAILQ_FIRST(&cpus)); | |
1386 | deal_with_unplugged_cpus(); | |
1387 | } | |
1388 | ||
1389 | return NULL; | |
1390 | } | |
1391 | ||
1392 | static void *qemu_hax_cpu_thread_fn(void *arg) | |
1393 | { | |
1394 | CPUState *cpu = arg; | |
1395 | int r; | |
1396 | ||
1397 | qemu_mutex_lock_iothread(); | |
1398 | qemu_thread_get_self(cpu->thread); | |
1399 | ||
1400 | cpu->thread_id = qemu_get_thread_id(); | |
1401 | cpu->created = true; | |
1402 | cpu->halted = 0; | |
1403 | current_cpu = cpu; | |
1404 | ||
1405 | hax_init_vcpu(cpu); | |
1406 | qemu_cond_signal(&qemu_cpu_cond); | |
1407 | ||
1408 | while (1) { | |
1409 | if (cpu_can_run(cpu)) { | |
1410 | r = hax_smp_cpu_exec(cpu); | |
1411 | if (r == EXCP_DEBUG) { | |
1412 | cpu_handle_guest_debug(cpu); | |
1413 | } | |
1414 | } | |
1415 | ||
1416 | while (cpu_thread_is_idle(cpu)) { | |
1417 | qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex); | |
1418 | } | |
1419 | #ifdef _WIN32 | |
1420 | SleepEx(0, TRUE); | |
1421 | #endif | |
1422 | qemu_wait_io_event_common(cpu); | |
1423 | } | |
1424 | return NULL; | |
1425 | } | |
1426 | ||
1427 | #ifdef _WIN32 | |
1428 | static void CALLBACK dummy_apc_func(ULONG_PTR unused) | |
1429 | { | |
1430 | } | |
1431 | #endif | |
1432 | ||
1433 | /* Multi-threaded TCG | |
1434 | * | |
1435 | * In the multi-threaded case each vCPU has its own thread. The TLS | |
1436 | * variable current_cpu can be used deep in the code to find the | |
1437 | * current CPUState for a given thread. | |
1438 | */ | |
1439 | ||
1440 | static void *qemu_tcg_cpu_thread_fn(void *arg) | |
1441 | { | |
1442 | CPUState *cpu = arg; | |
1443 | ||
1444 | g_assert(!use_icount); | |
1445 | ||
1446 | rcu_register_thread(); | |
1447 | ||
1448 | qemu_mutex_lock_iothread(); | |
1449 | qemu_thread_get_self(cpu->thread); | |
1450 | ||
1451 | cpu->thread_id = qemu_get_thread_id(); | |
1452 | cpu->created = true; | |
1453 | cpu->can_do_io = 1; | |
1454 | current_cpu = cpu; | |
1455 | qemu_cond_signal(&qemu_cpu_cond); | |
1456 | ||
1457 | /* process any pending work */ | |
1458 | cpu->exit_request = 1; | |
1459 | ||
1460 | while (1) { | |
1461 | if (cpu_can_run(cpu)) { | |
1462 | int r; | |
1463 | r = tcg_cpu_exec(cpu); | |
1464 | switch (r) { | |
1465 | case EXCP_DEBUG: | |
1466 | cpu_handle_guest_debug(cpu); | |
1467 | break; | |
1468 | case EXCP_HALTED: | |
1469 | /* during start-up the vCPU is reset and the thread is | |
1470 | * kicked several times. If we don't ensure we go back | |
1471 | * to sleep in the halted state we won't cleanly | |
1472 | * start-up when the vCPU is enabled. | |
1473 | * | |
1474 | * cpu->halted should ensure we sleep in wait_io_event | |
1475 | */ | |
1476 | g_assert(cpu->halted); | |
1477 | break; | |
1478 | case EXCP_ATOMIC: | |
1479 | qemu_mutex_unlock_iothread(); | |
1480 | cpu_exec_step_atomic(cpu); | |
1481 | qemu_mutex_lock_iothread(); | |
1482 | default: | |
1483 | /* Ignore everything else? */ | |
1484 | break; | |
1485 | } | |
1486 | } | |
1487 | ||
1488 | atomic_mb_set(&cpu->exit_request, 0); | |
1489 | qemu_tcg_wait_io_event(cpu); | |
1490 | } | |
1491 | ||
1492 | return NULL; | |
1493 | } | |
1494 | ||
1495 | static void qemu_cpu_kick_thread(CPUState *cpu) | |
1496 | { | |
1497 | #ifndef _WIN32 | |
1498 | int err; | |
1499 | ||
1500 | if (cpu->thread_kicked) { | |
1501 | return; | |
1502 | } | |
1503 | cpu->thread_kicked = true; | |
1504 | err = pthread_kill(cpu->thread->thread, SIG_IPI); | |
1505 | if (err) { | |
1506 | fprintf(stderr, "qemu:%s: %s", __func__, strerror(err)); | |
1507 | exit(1); | |
1508 | } | |
1509 | #else /* _WIN32 */ | |
1510 | if (!qemu_cpu_is_self(cpu)) { | |
1511 | if (!QueueUserAPC(dummy_apc_func, cpu->hThread, 0)) { | |
1512 | fprintf(stderr, "%s: QueueUserAPC failed with error %lu\n", | |
1513 | __func__, GetLastError()); | |
1514 | exit(1); | |
1515 | } | |
1516 | } | |
1517 | #endif | |
1518 | } | |
1519 | ||
1520 | void qemu_cpu_kick(CPUState *cpu) | |
1521 | { | |
1522 | qemu_cond_broadcast(cpu->halt_cond); | |
1523 | if (tcg_enabled()) { | |
1524 | cpu_exit(cpu); | |
1525 | /* NOP unless doing single-thread RR */ | |
1526 | qemu_cpu_kick_rr_cpu(); | |
1527 | } else { | |
1528 | if (hax_enabled()) { | |
1529 | /* | |
1530 | * FIXME: race condition with the exit_request check in | |
1531 | * hax_vcpu_hax_exec | |
1532 | */ | |
1533 | cpu->exit_request = 1; | |
1534 | } | |
1535 | qemu_cpu_kick_thread(cpu); | |
1536 | } | |
1537 | } | |
1538 | ||
1539 | void qemu_cpu_kick_self(void) | |
1540 | { | |
1541 | assert(current_cpu); | |
1542 | qemu_cpu_kick_thread(current_cpu); | |
1543 | } | |
1544 | ||
1545 | bool qemu_cpu_is_self(CPUState *cpu) | |
1546 | { | |
1547 | return qemu_thread_is_self(cpu->thread); | |
1548 | } | |
1549 | ||
1550 | bool qemu_in_vcpu_thread(void) | |
1551 | { | |
1552 | return current_cpu && qemu_cpu_is_self(current_cpu); | |
1553 | } | |
1554 | ||
1555 | static __thread bool iothread_locked = false; | |
1556 | ||
1557 | bool qemu_mutex_iothread_locked(void) | |
1558 | { | |
1559 | return iothread_locked; | |
1560 | } | |
1561 | ||
1562 | void qemu_mutex_lock_iothread(void) | |
1563 | { | |
1564 | g_assert(!qemu_mutex_iothread_locked()); | |
1565 | qemu_mutex_lock(&qemu_global_mutex); | |
1566 | iothread_locked = true; | |
1567 | } | |
1568 | ||
1569 | void qemu_mutex_unlock_iothread(void) | |
1570 | { | |
1571 | g_assert(qemu_mutex_iothread_locked()); | |
1572 | iothread_locked = false; | |
1573 | qemu_mutex_unlock(&qemu_global_mutex); | |
1574 | } | |
1575 | ||
1576 | static bool all_vcpus_paused(void) | |
1577 | { | |
1578 | CPUState *cpu; | |
1579 | ||
1580 | CPU_FOREACH(cpu) { | |
1581 | if (!cpu->stopped) { | |
1582 | return false; | |
1583 | } | |
1584 | } | |
1585 | ||
1586 | return true; | |
1587 | } | |
1588 | ||
1589 | void pause_all_vcpus(void) | |
1590 | { | |
1591 | CPUState *cpu; | |
1592 | ||
1593 | qemu_clock_enable(QEMU_CLOCK_VIRTUAL, false); | |
1594 | CPU_FOREACH(cpu) { | |
1595 | cpu->stop = true; | |
1596 | qemu_cpu_kick(cpu); | |
1597 | } | |
1598 | ||
1599 | if (qemu_in_vcpu_thread()) { | |
1600 | cpu_stop_current(); | |
1601 | } | |
1602 | ||
1603 | while (!all_vcpus_paused()) { | |
1604 | qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex); | |
1605 | CPU_FOREACH(cpu) { | |
1606 | qemu_cpu_kick(cpu); | |
1607 | } | |
1608 | } | |
1609 | } | |
1610 | ||
1611 | void cpu_resume(CPUState *cpu) | |
1612 | { | |
1613 | cpu->stop = false; | |
1614 | cpu->stopped = false; | |
1615 | qemu_cpu_kick(cpu); | |
1616 | } | |
1617 | ||
1618 | void resume_all_vcpus(void) | |
1619 | { | |
1620 | CPUState *cpu; | |
1621 | ||
1622 | qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true); | |
1623 | CPU_FOREACH(cpu) { | |
1624 | cpu_resume(cpu); | |
1625 | } | |
1626 | } | |
1627 | ||
1628 | void cpu_remove(CPUState *cpu) | |
1629 | { | |
1630 | cpu->stop = true; | |
1631 | cpu->unplug = true; | |
1632 | qemu_cpu_kick(cpu); | |
1633 | } | |
1634 | ||
1635 | void cpu_remove_sync(CPUState *cpu) | |
1636 | { | |
1637 | cpu_remove(cpu); | |
1638 | while (cpu->created) { | |
1639 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
1640 | } | |
1641 | } | |
1642 | ||
1643 | /* For temporary buffers for forming a name */ | |
1644 | #define VCPU_THREAD_NAME_SIZE 16 | |
1645 | ||
1646 | static void qemu_tcg_init_vcpu(CPUState *cpu) | |
1647 | { | |
1648 | char thread_name[VCPU_THREAD_NAME_SIZE]; | |
1649 | static QemuCond *single_tcg_halt_cond; | |
1650 | static QemuThread *single_tcg_cpu_thread; | |
1651 | ||
1652 | if (qemu_tcg_mttcg_enabled() || !single_tcg_cpu_thread) { | |
1653 | cpu->thread = g_malloc0(sizeof(QemuThread)); | |
1654 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); | |
1655 | qemu_cond_init(cpu->halt_cond); | |
1656 | ||
1657 | if (qemu_tcg_mttcg_enabled()) { | |
1658 | /* create a thread per vCPU with TCG (MTTCG) */ | |
1659 | parallel_cpus = true; | |
1660 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/TCG", | |
1661 | cpu->cpu_index); | |
1662 | ||
1663 | qemu_thread_create(cpu->thread, thread_name, qemu_tcg_cpu_thread_fn, | |
1664 | cpu, QEMU_THREAD_JOINABLE); | |
1665 | ||
1666 | } else { | |
1667 | /* share a single thread for all cpus with TCG */ | |
1668 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "ALL CPUs/TCG"); | |
1669 | qemu_thread_create(cpu->thread, thread_name, | |
1670 | qemu_tcg_rr_cpu_thread_fn, | |
1671 | cpu, QEMU_THREAD_JOINABLE); | |
1672 | ||
1673 | single_tcg_halt_cond = cpu->halt_cond; | |
1674 | single_tcg_cpu_thread = cpu->thread; | |
1675 | } | |
1676 | #ifdef _WIN32 | |
1677 | cpu->hThread = qemu_thread_get_handle(cpu->thread); | |
1678 | #endif | |
1679 | while (!cpu->created) { | |
1680 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
1681 | } | |
1682 | } else { | |
1683 | /* For non-MTTCG cases we share the thread */ | |
1684 | cpu->thread = single_tcg_cpu_thread; | |
1685 | cpu->halt_cond = single_tcg_halt_cond; | |
1686 | } | |
1687 | } | |
1688 | ||
1689 | static void qemu_hax_start_vcpu(CPUState *cpu) | |
1690 | { | |
1691 | char thread_name[VCPU_THREAD_NAME_SIZE]; | |
1692 | ||
1693 | cpu->thread = g_malloc0(sizeof(QemuThread)); | |
1694 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); | |
1695 | qemu_cond_init(cpu->halt_cond); | |
1696 | ||
1697 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/HAX", | |
1698 | cpu->cpu_index); | |
1699 | qemu_thread_create(cpu->thread, thread_name, qemu_hax_cpu_thread_fn, | |
1700 | cpu, QEMU_THREAD_JOINABLE); | |
1701 | #ifdef _WIN32 | |
1702 | cpu->hThread = qemu_thread_get_handle(cpu->thread); | |
1703 | #endif | |
1704 | while (!cpu->created) { | |
1705 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
1706 | } | |
1707 | } | |
1708 | ||
1709 | static void qemu_kvm_start_vcpu(CPUState *cpu) | |
1710 | { | |
1711 | char thread_name[VCPU_THREAD_NAME_SIZE]; | |
1712 | ||
1713 | cpu->thread = g_malloc0(sizeof(QemuThread)); | |
1714 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); | |
1715 | qemu_cond_init(cpu->halt_cond); | |
1716 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/KVM", | |
1717 | cpu->cpu_index); | |
1718 | qemu_thread_create(cpu->thread, thread_name, qemu_kvm_cpu_thread_fn, | |
1719 | cpu, QEMU_THREAD_JOINABLE); | |
1720 | while (!cpu->created) { | |
1721 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
1722 | } | |
1723 | } | |
1724 | ||
1725 | static void qemu_dummy_start_vcpu(CPUState *cpu) | |
1726 | { | |
1727 | char thread_name[VCPU_THREAD_NAME_SIZE]; | |
1728 | ||
1729 | cpu->thread = g_malloc0(sizeof(QemuThread)); | |
1730 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); | |
1731 | qemu_cond_init(cpu->halt_cond); | |
1732 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY", | |
1733 | cpu->cpu_index); | |
1734 | qemu_thread_create(cpu->thread, thread_name, qemu_dummy_cpu_thread_fn, cpu, | |
1735 | QEMU_THREAD_JOINABLE); | |
1736 | while (!cpu->created) { | |
1737 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
1738 | } | |
1739 | } | |
1740 | ||
1741 | void qemu_init_vcpu(CPUState *cpu) | |
1742 | { | |
1743 | cpu->nr_cores = smp_cores; | |
1744 | cpu->nr_threads = smp_threads; | |
1745 | cpu->stopped = true; | |
1746 | ||
1747 | if (!cpu->as) { | |
1748 | /* If the target cpu hasn't set up any address spaces itself, | |
1749 | * give it the default one. | |
1750 | */ | |
1751 | AddressSpace *as = address_space_init_shareable(cpu->memory, | |
1752 | "cpu-memory"); | |
1753 | cpu->num_ases = 1; | |
1754 | cpu_address_space_init(cpu, as, 0); | |
1755 | } | |
1756 | ||
1757 | if (kvm_enabled()) { | |
1758 | qemu_kvm_start_vcpu(cpu); | |
1759 | } else if (hax_enabled()) { | |
1760 | qemu_hax_start_vcpu(cpu); | |
1761 | } else if (tcg_enabled()) { | |
1762 | qemu_tcg_init_vcpu(cpu); | |
1763 | } else { | |
1764 | qemu_dummy_start_vcpu(cpu); | |
1765 | } | |
1766 | } | |
1767 | ||
1768 | void cpu_stop_current(void) | |
1769 | { | |
1770 | if (current_cpu) { | |
1771 | current_cpu->stop = false; | |
1772 | current_cpu->stopped = true; | |
1773 | cpu_exit(current_cpu); | |
1774 | qemu_cond_broadcast(&qemu_pause_cond); | |
1775 | } | |
1776 | } | |
1777 | ||
1778 | int vm_stop(RunState state) | |
1779 | { | |
1780 | if (qemu_in_vcpu_thread()) { | |
1781 | qemu_system_vmstop_request_prepare(); | |
1782 | qemu_system_vmstop_request(state); | |
1783 | /* | |
1784 | * FIXME: should not return to device code in case | |
1785 | * vm_stop() has been requested. | |
1786 | */ | |
1787 | cpu_stop_current(); | |
1788 | return 0; | |
1789 | } | |
1790 | ||
1791 | return do_vm_stop(state); | |
1792 | } | |
1793 | ||
1794 | /** | |
1795 | * Prepare for (re)starting the VM. | |
1796 | * Returns -1 if the vCPUs are not to be restarted (e.g. if they are already | |
1797 | * running or in case of an error condition), 0 otherwise. | |
1798 | */ | |
1799 | int vm_prepare_start(void) | |
1800 | { | |
1801 | RunState requested; | |
1802 | int res = 0; | |
1803 | ||
1804 | qemu_vmstop_requested(&requested); | |
1805 | if (runstate_is_running() && requested == RUN_STATE__MAX) { | |
1806 | return -1; | |
1807 | } | |
1808 | ||
1809 | /* Ensure that a STOP/RESUME pair of events is emitted if a | |
1810 | * vmstop request was pending. The BLOCK_IO_ERROR event, for | |
1811 | * example, according to documentation is always followed by | |
1812 | * the STOP event. | |
1813 | */ | |
1814 | if (runstate_is_running()) { | |
1815 | qapi_event_send_stop(&error_abort); | |
1816 | res = -1; | |
1817 | } else { | |
1818 | replay_enable_events(); | |
1819 | cpu_enable_ticks(); | |
1820 | runstate_set(RUN_STATE_RUNNING); | |
1821 | vm_state_notify(1, RUN_STATE_RUNNING); | |
1822 | } | |
1823 | ||
1824 | /* We are sending this now, but the CPUs will be resumed shortly later */ | |
1825 | qapi_event_send_resume(&error_abort); | |
1826 | return res; | |
1827 | } | |
1828 | ||
1829 | void vm_start(void) | |
1830 | { | |
1831 | if (!vm_prepare_start()) { | |
1832 | resume_all_vcpus(); | |
1833 | } | |
1834 | } | |
1835 | ||
1836 | /* does a state transition even if the VM is already stopped, | |
1837 | current state is forgotten forever */ | |
1838 | int vm_stop_force_state(RunState state) | |
1839 | { | |
1840 | if (runstate_is_running()) { | |
1841 | return vm_stop(state); | |
1842 | } else { | |
1843 | runstate_set(state); | |
1844 | ||
1845 | bdrv_drain_all(); | |
1846 | /* Make sure to return an error if the flush in a previous vm_stop() | |
1847 | * failed. */ | |
1848 | return bdrv_flush_all(); | |
1849 | } | |
1850 | } | |
1851 | ||
1852 | void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) | |
1853 | { | |
1854 | /* XXX: implement xxx_cpu_list for targets that still miss it */ | |
1855 | #if defined(cpu_list) | |
1856 | cpu_list(f, cpu_fprintf); | |
1857 | #endif | |
1858 | } | |
1859 | ||
1860 | CpuInfoList *qmp_query_cpus(Error **errp) | |
1861 | { | |
1862 | CpuInfoList *head = NULL, *cur_item = NULL; | |
1863 | CPUState *cpu; | |
1864 | ||
1865 | CPU_FOREACH(cpu) { | |
1866 | CpuInfoList *info; | |
1867 | #if defined(TARGET_I386) | |
1868 | X86CPU *x86_cpu = X86_CPU(cpu); | |
1869 | CPUX86State *env = &x86_cpu->env; | |
1870 | #elif defined(TARGET_PPC) | |
1871 | PowerPCCPU *ppc_cpu = POWERPC_CPU(cpu); | |
1872 | CPUPPCState *env = &ppc_cpu->env; | |
1873 | #elif defined(TARGET_SPARC) | |
1874 | SPARCCPU *sparc_cpu = SPARC_CPU(cpu); | |
1875 | CPUSPARCState *env = &sparc_cpu->env; | |
1876 | #elif defined(TARGET_MIPS) | |
1877 | MIPSCPU *mips_cpu = MIPS_CPU(cpu); | |
1878 | CPUMIPSState *env = &mips_cpu->env; | |
1879 | #elif defined(TARGET_TRICORE) | |
1880 | TriCoreCPU *tricore_cpu = TRICORE_CPU(cpu); | |
1881 | CPUTriCoreState *env = &tricore_cpu->env; | |
1882 | #endif | |
1883 | ||
1884 | cpu_synchronize_state(cpu); | |
1885 | ||
1886 | info = g_malloc0(sizeof(*info)); | |
1887 | info->value = g_malloc0(sizeof(*info->value)); | |
1888 | info->value->CPU = cpu->cpu_index; | |
1889 | info->value->current = (cpu == first_cpu); | |
1890 | info->value->halted = cpu->halted; | |
1891 | info->value->qom_path = object_get_canonical_path(OBJECT(cpu)); | |
1892 | info->value->thread_id = cpu->thread_id; | |
1893 | #if defined(TARGET_I386) | |
1894 | info->value->arch = CPU_INFO_ARCH_X86; | |
1895 | info->value->u.x86.pc = env->eip + env->segs[R_CS].base; | |
1896 | #elif defined(TARGET_PPC) | |
1897 | info->value->arch = CPU_INFO_ARCH_PPC; | |
1898 | info->value->u.ppc.nip = env->nip; | |
1899 | #elif defined(TARGET_SPARC) | |
1900 | info->value->arch = CPU_INFO_ARCH_SPARC; | |
1901 | info->value->u.q_sparc.pc = env->pc; | |
1902 | info->value->u.q_sparc.npc = env->npc; | |
1903 | #elif defined(TARGET_MIPS) | |
1904 | info->value->arch = CPU_INFO_ARCH_MIPS; | |
1905 | info->value->u.q_mips.PC = env->active_tc.PC; | |
1906 | #elif defined(TARGET_TRICORE) | |
1907 | info->value->arch = CPU_INFO_ARCH_TRICORE; | |
1908 | info->value->u.tricore.PC = env->PC; | |
1909 | #else | |
1910 | info->value->arch = CPU_INFO_ARCH_OTHER; | |
1911 | #endif | |
1912 | ||
1913 | /* XXX: waiting for the qapi to support GSList */ | |
1914 | if (!cur_item) { | |
1915 | head = cur_item = info; | |
1916 | } else { | |
1917 | cur_item->next = info; | |
1918 | cur_item = info; | |
1919 | } | |
1920 | } | |
1921 | ||
1922 | return head; | |
1923 | } | |
1924 | ||
1925 | void qmp_memsave(int64_t addr, int64_t size, const char *filename, | |
1926 | bool has_cpu, int64_t cpu_index, Error **errp) | |
1927 | { | |
1928 | FILE *f; | |
1929 | uint32_t l; | |
1930 | CPUState *cpu; | |
1931 | uint8_t buf[1024]; | |
1932 | int64_t orig_addr = addr, orig_size = size; | |
1933 | ||
1934 | if (!has_cpu) { | |
1935 | cpu_index = 0; | |
1936 | } | |
1937 | ||
1938 | cpu = qemu_get_cpu(cpu_index); | |
1939 | if (cpu == NULL) { | |
1940 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index", | |
1941 | "a CPU number"); | |
1942 | return; | |
1943 | } | |
1944 | ||
1945 | f = fopen(filename, "wb"); | |
1946 | if (!f) { | |
1947 | error_setg_file_open(errp, errno, filename); | |
1948 | return; | |
1949 | } | |
1950 | ||
1951 | while (size != 0) { | |
1952 | l = sizeof(buf); | |
1953 | if (l > size) | |
1954 | l = size; | |
1955 | if (cpu_memory_rw_debug(cpu, addr, buf, l, 0) != 0) { | |
1956 | error_setg(errp, "Invalid addr 0x%016" PRIx64 "/size %" PRId64 | |
1957 | " specified", orig_addr, orig_size); | |
1958 | goto exit; | |
1959 | } | |
1960 | if (fwrite(buf, 1, l, f) != l) { | |
1961 | error_setg(errp, QERR_IO_ERROR); | |
1962 | goto exit; | |
1963 | } | |
1964 | addr += l; | |
1965 | size -= l; | |
1966 | } | |
1967 | ||
1968 | exit: | |
1969 | fclose(f); | |
1970 | } | |
1971 | ||
1972 | void qmp_pmemsave(int64_t addr, int64_t size, const char *filename, | |
1973 | Error **errp) | |
1974 | { | |
1975 | FILE *f; | |
1976 | uint32_t l; | |
1977 | uint8_t buf[1024]; | |
1978 | ||
1979 | f = fopen(filename, "wb"); | |
1980 | if (!f) { | |
1981 | error_setg_file_open(errp, errno, filename); | |
1982 | return; | |
1983 | } | |
1984 | ||
1985 | while (size != 0) { | |
1986 | l = sizeof(buf); | |
1987 | if (l > size) | |
1988 | l = size; | |
1989 | cpu_physical_memory_read(addr, buf, l); | |
1990 | if (fwrite(buf, 1, l, f) != l) { | |
1991 | error_setg(errp, QERR_IO_ERROR); | |
1992 | goto exit; | |
1993 | } | |
1994 | addr += l; | |
1995 | size -= l; | |
1996 | } | |
1997 | ||
1998 | exit: | |
1999 | fclose(f); | |
2000 | } | |
2001 | ||
2002 | void qmp_inject_nmi(Error **errp) | |
2003 | { | |
2004 | nmi_monitor_handle(monitor_get_cpu_index(), errp); | |
2005 | } | |
2006 | ||
2007 | void dump_drift_info(FILE *f, fprintf_function cpu_fprintf) | |
2008 | { | |
2009 | if (!use_icount) { | |
2010 | return; | |
2011 | } | |
2012 | ||
2013 | cpu_fprintf(f, "Host - Guest clock %"PRIi64" ms\n", | |
2014 | (cpu_get_clock() - cpu_get_icount())/SCALE_MS); | |
2015 | if (icount_align_option) { | |
2016 | cpu_fprintf(f, "Max guest delay %"PRIi64" ms\n", -max_delay/SCALE_MS); | |
2017 | cpu_fprintf(f, "Max guest advance %"PRIi64" ms\n", max_advance/SCALE_MS); | |
2018 | } else { | |
2019 | cpu_fprintf(f, "Max guest delay NA\n"); | |
2020 | cpu_fprintf(f, "Max guest advance NA\n"); | |
2021 | } | |
2022 | } |