]>
Commit | Line | Data |
---|---|---|
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 | #ifndef _WIN32 | |
55 | #include "qemu/compatfd.h" | |
56 | #endif | |
57 | ||
58 | #ifdef CONFIG_LINUX | |
59 | ||
60 | #include <sys/prctl.h> | |
61 | ||
62 | #ifndef PR_MCE_KILL | |
63 | #define PR_MCE_KILL 33 | |
64 | #endif | |
65 | ||
66 | #ifndef PR_MCE_KILL_SET | |
67 | #define PR_MCE_KILL_SET 1 | |
68 | #endif | |
69 | ||
70 | #ifndef PR_MCE_KILL_EARLY | |
71 | #define PR_MCE_KILL_EARLY 1 | |
72 | #endif | |
73 | ||
74 | #endif /* CONFIG_LINUX */ | |
75 | ||
76 | int64_t max_delay; | |
77 | int64_t max_advance; | |
78 | ||
79 | /* vcpu throttling controls */ | |
80 | static QEMUTimer *throttle_timer; | |
81 | static unsigned int throttle_percentage; | |
82 | ||
83 | #define CPU_THROTTLE_PCT_MIN 1 | |
84 | #define CPU_THROTTLE_PCT_MAX 99 | |
85 | #define CPU_THROTTLE_TIMESLICE_NS 10000000 | |
86 | ||
87 | bool cpu_is_stopped(CPUState *cpu) | |
88 | { | |
89 | return cpu->stopped || !runstate_is_running(); | |
90 | } | |
91 | ||
92 | static bool cpu_thread_is_idle(CPUState *cpu) | |
93 | { | |
94 | if (cpu->stop || cpu->queued_work_first) { | |
95 | return false; | |
96 | } | |
97 | if (cpu_is_stopped(cpu)) { | |
98 | return true; | |
99 | } | |
100 | if (!cpu->halted || cpu_has_work(cpu) || | |
101 | kvm_halt_in_kernel()) { | |
102 | return false; | |
103 | } | |
104 | return true; | |
105 | } | |
106 | ||
107 | static bool all_cpu_threads_idle(void) | |
108 | { | |
109 | CPUState *cpu; | |
110 | ||
111 | CPU_FOREACH(cpu) { | |
112 | if (!cpu_thread_is_idle(cpu)) { | |
113 | return false; | |
114 | } | |
115 | } | |
116 | return true; | |
117 | } | |
118 | ||
119 | /***********************************************************/ | |
120 | /* guest cycle counter */ | |
121 | ||
122 | /* Protected by TimersState seqlock */ | |
123 | ||
124 | static bool icount_sleep = true; | |
125 | static int64_t vm_clock_warp_start = -1; | |
126 | /* Conversion factor from emulated instructions to virtual clock ticks. */ | |
127 | static int icount_time_shift; | |
128 | /* Arbitrarily pick 1MIPS as the minimum allowable speed. */ | |
129 | #define MAX_ICOUNT_SHIFT 10 | |
130 | ||
131 | static QEMUTimer *icount_rt_timer; | |
132 | static QEMUTimer *icount_vm_timer; | |
133 | static QEMUTimer *icount_warp_timer; | |
134 | ||
135 | typedef struct TimersState { | |
136 | /* Protected by BQL. */ | |
137 | int64_t cpu_ticks_prev; | |
138 | int64_t cpu_ticks_offset; | |
139 | ||
140 | /* cpu_clock_offset can be read out of BQL, so protect it with | |
141 | * this lock. | |
142 | */ | |
143 | QemuSeqLock vm_clock_seqlock; | |
144 | int64_t cpu_clock_offset; | |
145 | int32_t cpu_ticks_enabled; | |
146 | int64_t dummy; | |
147 | ||
148 | /* Compensate for varying guest execution speed. */ | |
149 | int64_t qemu_icount_bias; | |
150 | /* Only written by TCG thread */ | |
151 | int64_t qemu_icount; | |
152 | } TimersState; | |
153 | ||
154 | static TimersState timers_state; | |
155 | bool mttcg_enabled; | |
156 | ||
157 | /* | |
158 | * We default to false if we know other options have been enabled | |
159 | * which are currently incompatible with MTTCG. Otherwise when each | |
160 | * guest (target) has been updated to support: | |
161 | * - atomic instructions | |
162 | * - memory ordering primitives (barriers) | |
163 | * they can set the appropriate CONFIG flags in ${target}-softmmu.mak | |
164 | * | |
165 | * Once a guest architecture has been converted to the new primitives | |
166 | * there are two remaining limitations to check. | |
167 | * | |
168 | * - The guest can't be oversized (e.g. 64 bit guest on 32 bit host) | |
169 | * - The host must have a stronger memory order than the guest | |
170 | * | |
171 | * It may be possible in future to support strong guests on weak hosts | |
172 | * but that will require tagging all load/stores in a guest with their | |
173 | * implicit memory order requirements which would likely slow things | |
174 | * down a lot. | |
175 | */ | |
176 | ||
177 | static bool check_tcg_memory_orders_compatible(void) | |
178 | { | |
179 | #if defined(TCG_GUEST_DEFAULT_MO) && defined(TCG_TARGET_DEFAULT_MO) | |
180 | return (TCG_GUEST_DEFAULT_MO & ~TCG_TARGET_DEFAULT_MO) == 0; | |
181 | #else | |
182 | return false; | |
183 | #endif | |
184 | } | |
185 | ||
186 | static bool default_mttcg_enabled(void) | |
187 | { | |
188 | QemuOpts *icount_opts = qemu_find_opts_singleton("icount"); | |
189 | const char *rr = qemu_opt_get(icount_opts, "rr"); | |
190 | ||
191 | if (rr || TCG_OVERSIZED_GUEST) { | |
192 | return false; | |
193 | } else { | |
194 | #ifdef TARGET_SUPPORTS_MTTCG | |
195 | return check_tcg_memory_orders_compatible(); | |
196 | #else | |
197 | return false; | |
198 | #endif | |
199 | } | |
200 | } | |
201 | ||
202 | void qemu_tcg_configure(QemuOpts *opts, Error **errp) | |
203 | { | |
204 | const char *t = qemu_opt_get(opts, "thread"); | |
205 | if (t) { | |
206 | if (strcmp(t, "multi") == 0) { | |
207 | if (TCG_OVERSIZED_GUEST) { | |
208 | error_setg(errp, "No MTTCG when guest word size > hosts"); | |
209 | } else { | |
210 | if (!check_tcg_memory_orders_compatible()) { | |
211 | error_report("Guest expects a stronger memory ordering " | |
212 | "than the host provides"); | |
213 | error_printf("This may cause strange/hard to debug errors"); | |
214 | } | |
215 | mttcg_enabled = true; | |
216 | } | |
217 | } else if (strcmp(t, "single") == 0) { | |
218 | mttcg_enabled = false; | |
219 | } else { | |
220 | error_setg(errp, "Invalid 'thread' setting %s", t); | |
221 | } | |
222 | } else { | |
223 | mttcg_enabled = default_mttcg_enabled(); | |
224 | } | |
225 | } | |
226 | ||
227 | int64_t cpu_get_icount_raw(void) | |
228 | { | |
229 | int64_t icount; | |
230 | CPUState *cpu = current_cpu; | |
231 | ||
232 | icount = timers_state.qemu_icount; | |
233 | if (cpu) { | |
234 | if (!cpu->can_do_io) { | |
235 | fprintf(stderr, "Bad icount read\n"); | |
236 | exit(1); | |
237 | } | |
238 | icount -= (cpu->icount_decr.u16.low + cpu->icount_extra); | |
239 | } | |
240 | return icount; | |
241 | } | |
242 | ||
243 | /* Return the virtual CPU time, based on the instruction counter. */ | |
244 | static int64_t cpu_get_icount_locked(void) | |
245 | { | |
246 | int64_t icount = cpu_get_icount_raw(); | |
247 | return timers_state.qemu_icount_bias + cpu_icount_to_ns(icount); | |
248 | } | |
249 | ||
250 | int64_t cpu_get_icount(void) | |
251 | { | |
252 | int64_t icount; | |
253 | unsigned start; | |
254 | ||
255 | do { | |
256 | start = seqlock_read_begin(&timers_state.vm_clock_seqlock); | |
257 | icount = cpu_get_icount_locked(); | |
258 | } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, start)); | |
259 | ||
260 | return icount; | |
261 | } | |
262 | ||
263 | int64_t cpu_icount_to_ns(int64_t icount) | |
264 | { | |
265 | return icount << icount_time_shift; | |
266 | } | |
267 | ||
268 | /* return the time elapsed in VM between vm_start and vm_stop. Unless | |
269 | * icount is active, cpu_get_ticks() uses units of the host CPU cycle | |
270 | * counter. | |
271 | * | |
272 | * Caller must hold the BQL | |
273 | */ | |
274 | int64_t cpu_get_ticks(void) | |
275 | { | |
276 | int64_t ticks; | |
277 | ||
278 | if (use_icount) { | |
279 | return cpu_get_icount(); | |
280 | } | |
281 | ||
282 | ticks = timers_state.cpu_ticks_offset; | |
283 | if (timers_state.cpu_ticks_enabled) { | |
284 | ticks += cpu_get_host_ticks(); | |
285 | } | |
286 | ||
287 | if (timers_state.cpu_ticks_prev > ticks) { | |
288 | /* Note: non increasing ticks may happen if the host uses | |
289 | software suspend */ | |
290 | timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks; | |
291 | ticks = timers_state.cpu_ticks_prev; | |
292 | } | |
293 | ||
294 | timers_state.cpu_ticks_prev = ticks; | |
295 | return ticks; | |
296 | } | |
297 | ||
298 | static int64_t cpu_get_clock_locked(void) | |
299 | { | |
300 | int64_t time; | |
301 | ||
302 | time = timers_state.cpu_clock_offset; | |
303 | if (timers_state.cpu_ticks_enabled) { | |
304 | time += get_clock(); | |
305 | } | |
306 | ||
307 | return time; | |
308 | } | |
309 | ||
310 | /* Return the monotonic time elapsed in VM, i.e., | |
311 | * the time between vm_start and vm_stop | |
312 | */ | |
313 | int64_t cpu_get_clock(void) | |
314 | { | |
315 | int64_t ti; | |
316 | unsigned start; | |
317 | ||
318 | do { | |
319 | start = seqlock_read_begin(&timers_state.vm_clock_seqlock); | |
320 | ti = cpu_get_clock_locked(); | |
321 | } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, start)); | |
322 | ||
323 | return ti; | |
324 | } | |
325 | ||
326 | /* enable cpu_get_ticks() | |
327 | * Caller must hold BQL which serves as mutex for vm_clock_seqlock. | |
328 | */ | |
329 | void cpu_enable_ticks(void) | |
330 | { | |
331 | /* Here, the really thing protected by seqlock is cpu_clock_offset. */ | |
332 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
333 | if (!timers_state.cpu_ticks_enabled) { | |
334 | timers_state.cpu_ticks_offset -= cpu_get_host_ticks(); | |
335 | timers_state.cpu_clock_offset -= get_clock(); | |
336 | timers_state.cpu_ticks_enabled = 1; | |
337 | } | |
338 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
339 | } | |
340 | ||
341 | /* disable cpu_get_ticks() : the clock is stopped. You must not call | |
342 | * cpu_get_ticks() after that. | |
343 | * Caller must hold BQL which serves as mutex for vm_clock_seqlock. | |
344 | */ | |
345 | void cpu_disable_ticks(void) | |
346 | { | |
347 | /* Here, the really thing protected by seqlock is cpu_clock_offset. */ | |
348 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
349 | if (timers_state.cpu_ticks_enabled) { | |
350 | timers_state.cpu_ticks_offset += cpu_get_host_ticks(); | |
351 | timers_state.cpu_clock_offset = cpu_get_clock_locked(); | |
352 | timers_state.cpu_ticks_enabled = 0; | |
353 | } | |
354 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
355 | } | |
356 | ||
357 | /* Correlation between real and virtual time is always going to be | |
358 | fairly approximate, so ignore small variation. | |
359 | When the guest is idle real and virtual time will be aligned in | |
360 | the IO wait loop. */ | |
361 | #define ICOUNT_WOBBLE (NANOSECONDS_PER_SECOND / 10) | |
362 | ||
363 | static void icount_adjust(void) | |
364 | { | |
365 | int64_t cur_time; | |
366 | int64_t cur_icount; | |
367 | int64_t delta; | |
368 | ||
369 | /* Protected by TimersState mutex. */ | |
370 | static int64_t last_delta; | |
371 | ||
372 | /* If the VM is not running, then do nothing. */ | |
373 | if (!runstate_is_running()) { | |
374 | return; | |
375 | } | |
376 | ||
377 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
378 | cur_time = cpu_get_clock_locked(); | |
379 | cur_icount = cpu_get_icount_locked(); | |
380 | ||
381 | delta = cur_icount - cur_time; | |
382 | /* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */ | |
383 | if (delta > 0 | |
384 | && last_delta + ICOUNT_WOBBLE < delta * 2 | |
385 | && icount_time_shift > 0) { | |
386 | /* The guest is getting too far ahead. Slow time down. */ | |
387 | icount_time_shift--; | |
388 | } | |
389 | if (delta < 0 | |
390 | && last_delta - ICOUNT_WOBBLE > delta * 2 | |
391 | && icount_time_shift < MAX_ICOUNT_SHIFT) { | |
392 | /* The guest is getting too far behind. Speed time up. */ | |
393 | icount_time_shift++; | |
394 | } | |
395 | last_delta = delta; | |
396 | timers_state.qemu_icount_bias = cur_icount | |
397 | - (timers_state.qemu_icount << icount_time_shift); | |
398 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
399 | } | |
400 | ||
401 | static void icount_adjust_rt(void *opaque) | |
402 | { | |
403 | timer_mod(icount_rt_timer, | |
404 | qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL_RT) + 1000); | |
405 | icount_adjust(); | |
406 | } | |
407 | ||
408 | static void icount_adjust_vm(void *opaque) | |
409 | { | |
410 | timer_mod(icount_vm_timer, | |
411 | qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + | |
412 | NANOSECONDS_PER_SECOND / 10); | |
413 | icount_adjust(); | |
414 | } | |
415 | ||
416 | static int64_t qemu_icount_round(int64_t count) | |
417 | { | |
418 | return (count + (1 << icount_time_shift) - 1) >> icount_time_shift; | |
419 | } | |
420 | ||
421 | static void icount_warp_rt(void) | |
422 | { | |
423 | unsigned seq; | |
424 | int64_t warp_start; | |
425 | ||
426 | /* The icount_warp_timer is rescheduled soon after vm_clock_warp_start | |
427 | * changes from -1 to another value, so the race here is okay. | |
428 | */ | |
429 | do { | |
430 | seq = seqlock_read_begin(&timers_state.vm_clock_seqlock); | |
431 | warp_start = vm_clock_warp_start; | |
432 | } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, seq)); | |
433 | ||
434 | if (warp_start == -1) { | |
435 | return; | |
436 | } | |
437 | ||
438 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
439 | if (runstate_is_running()) { | |
440 | int64_t clock = REPLAY_CLOCK(REPLAY_CLOCK_VIRTUAL_RT, | |
441 | cpu_get_clock_locked()); | |
442 | int64_t warp_delta; | |
443 | ||
444 | warp_delta = clock - vm_clock_warp_start; | |
445 | if (use_icount == 2) { | |
446 | /* | |
447 | * In adaptive mode, do not let QEMU_CLOCK_VIRTUAL run too | |
448 | * far ahead of real time. | |
449 | */ | |
450 | int64_t cur_icount = cpu_get_icount_locked(); | |
451 | int64_t delta = clock - cur_icount; | |
452 | warp_delta = MIN(warp_delta, delta); | |
453 | } | |
454 | timers_state.qemu_icount_bias += warp_delta; | |
455 | } | |
456 | vm_clock_warp_start = -1; | |
457 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
458 | ||
459 | if (qemu_clock_expired(QEMU_CLOCK_VIRTUAL)) { | |
460 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); | |
461 | } | |
462 | } | |
463 | ||
464 | static void icount_timer_cb(void *opaque) | |
465 | { | |
466 | /* No need for a checkpoint because the timer already synchronizes | |
467 | * with CHECKPOINT_CLOCK_VIRTUAL_RT. | |
468 | */ | |
469 | icount_warp_rt(); | |
470 | } | |
471 | ||
472 | void qtest_clock_warp(int64_t dest) | |
473 | { | |
474 | int64_t clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); | |
475 | AioContext *aio_context; | |
476 | assert(qtest_enabled()); | |
477 | aio_context = qemu_get_aio_context(); | |
478 | while (clock < dest) { | |
479 | int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL); | |
480 | int64_t warp = qemu_soonest_timeout(dest - clock, deadline); | |
481 | ||
482 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
483 | timers_state.qemu_icount_bias += warp; | |
484 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
485 | ||
486 | qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL); | |
487 | timerlist_run_timers(aio_context->tlg.tl[QEMU_CLOCK_VIRTUAL]); | |
488 | clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); | |
489 | } | |
490 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); | |
491 | } | |
492 | ||
493 | void qemu_start_warp_timer(void) | |
494 | { | |
495 | int64_t clock; | |
496 | int64_t deadline; | |
497 | ||
498 | if (!use_icount) { | |
499 | return; | |
500 | } | |
501 | ||
502 | /* Nothing to do if the VM is stopped: QEMU_CLOCK_VIRTUAL timers | |
503 | * do not fire, so computing the deadline does not make sense. | |
504 | */ | |
505 | if (!runstate_is_running()) { | |
506 | return; | |
507 | } | |
508 | ||
509 | /* warp clock deterministically in record/replay mode */ | |
510 | if (!replay_checkpoint(CHECKPOINT_CLOCK_WARP_START)) { | |
511 | return; | |
512 | } | |
513 | ||
514 | if (!all_cpu_threads_idle()) { | |
515 | return; | |
516 | } | |
517 | ||
518 | if (qtest_enabled()) { | |
519 | /* When testing, qtest commands advance icount. */ | |
520 | return; | |
521 | } | |
522 | ||
523 | /* We want to use the earliest deadline from ALL vm_clocks */ | |
524 | clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT); | |
525 | deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL); | |
526 | if (deadline < 0) { | |
527 | static bool notified; | |
528 | if (!icount_sleep && !notified) { | |
529 | error_report("WARNING: icount sleep disabled and no active timers"); | |
530 | notified = true; | |
531 | } | |
532 | return; | |
533 | } | |
534 | ||
535 | if (deadline > 0) { | |
536 | /* | |
537 | * Ensure QEMU_CLOCK_VIRTUAL proceeds even when the virtual CPU goes to | |
538 | * sleep. Otherwise, the CPU might be waiting for a future timer | |
539 | * interrupt to wake it up, but the interrupt never comes because | |
540 | * the vCPU isn't running any insns and thus doesn't advance the | |
541 | * QEMU_CLOCK_VIRTUAL. | |
542 | */ | |
543 | if (!icount_sleep) { | |
544 | /* | |
545 | * We never let VCPUs sleep in no sleep icount mode. | |
546 | * If there is a pending QEMU_CLOCK_VIRTUAL timer we just advance | |
547 | * to the next QEMU_CLOCK_VIRTUAL event and notify it. | |
548 | * It is useful when we want a deterministic execution time, | |
549 | * isolated from host latencies. | |
550 | */ | |
551 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
552 | timers_state.qemu_icount_bias += deadline; | |
553 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
554 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); | |
555 | } else { | |
556 | /* | |
557 | * We do stop VCPUs and only advance QEMU_CLOCK_VIRTUAL after some | |
558 | * "real" time, (related to the time left until the next event) has | |
559 | * passed. The QEMU_CLOCK_VIRTUAL_RT clock will do this. | |
560 | * This avoids that the warps are visible externally; for example, | |
561 | * you will not be sending network packets continuously instead of | |
562 | * every 100ms. | |
563 | */ | |
564 | seqlock_write_begin(&timers_state.vm_clock_seqlock); | |
565 | if (vm_clock_warp_start == -1 || vm_clock_warp_start > clock) { | |
566 | vm_clock_warp_start = clock; | |
567 | } | |
568 | seqlock_write_end(&timers_state.vm_clock_seqlock); | |
569 | timer_mod_anticipate(icount_warp_timer, clock + deadline); | |
570 | } | |
571 | } else if (deadline == 0) { | |
572 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); | |
573 | } | |
574 | } | |
575 | ||
576 | static void qemu_account_warp_timer(void) | |
577 | { | |
578 | if (!use_icount || !icount_sleep) { | |
579 | return; | |
580 | } | |
581 | ||
582 | /* Nothing to do if the VM is stopped: QEMU_CLOCK_VIRTUAL timers | |
583 | * do not fire, so computing the deadline does not make sense. | |
584 | */ | |
585 | if (!runstate_is_running()) { | |
586 | return; | |
587 | } | |
588 | ||
589 | /* warp clock deterministically in record/replay mode */ | |
590 | if (!replay_checkpoint(CHECKPOINT_CLOCK_WARP_ACCOUNT)) { | |
591 | return; | |
592 | } | |
593 | ||
594 | timer_del(icount_warp_timer); | |
595 | icount_warp_rt(); | |
596 | } | |
597 | ||
598 | static bool icount_state_needed(void *opaque) | |
599 | { | |
600 | return use_icount; | |
601 | } | |
602 | ||
603 | /* | |
604 | * This is a subsection for icount migration. | |
605 | */ | |
606 | static const VMStateDescription icount_vmstate_timers = { | |
607 | .name = "timer/icount", | |
608 | .version_id = 1, | |
609 | .minimum_version_id = 1, | |
610 | .needed = icount_state_needed, | |
611 | .fields = (VMStateField[]) { | |
612 | VMSTATE_INT64(qemu_icount_bias, TimersState), | |
613 | VMSTATE_INT64(qemu_icount, TimersState), | |
614 | VMSTATE_END_OF_LIST() | |
615 | } | |
616 | }; | |
617 | ||
618 | static const VMStateDescription vmstate_timers = { | |
619 | .name = "timer", | |
620 | .version_id = 2, | |
621 | .minimum_version_id = 1, | |
622 | .fields = (VMStateField[]) { | |
623 | VMSTATE_INT64(cpu_ticks_offset, TimersState), | |
624 | VMSTATE_INT64(dummy, TimersState), | |
625 | VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2), | |
626 | VMSTATE_END_OF_LIST() | |
627 | }, | |
628 | .subsections = (const VMStateDescription*[]) { | |
629 | &icount_vmstate_timers, | |
630 | NULL | |
631 | } | |
632 | }; | |
633 | ||
634 | static void cpu_throttle_thread(CPUState *cpu, run_on_cpu_data opaque) | |
635 | { | |
636 | double pct; | |
637 | double throttle_ratio; | |
638 | long sleeptime_ns; | |
639 | ||
640 | if (!cpu_throttle_get_percentage()) { | |
641 | return; | |
642 | } | |
643 | ||
644 | pct = (double)cpu_throttle_get_percentage()/100; | |
645 | throttle_ratio = pct / (1 - pct); | |
646 | sleeptime_ns = (long)(throttle_ratio * CPU_THROTTLE_TIMESLICE_NS); | |
647 | ||
648 | qemu_mutex_unlock_iothread(); | |
649 | atomic_set(&cpu->throttle_thread_scheduled, 0); | |
650 | g_usleep(sleeptime_ns / 1000); /* Convert ns to us for usleep call */ | |
651 | qemu_mutex_lock_iothread(); | |
652 | } | |
653 | ||
654 | static void cpu_throttle_timer_tick(void *opaque) | |
655 | { | |
656 | CPUState *cpu; | |
657 | double pct; | |
658 | ||
659 | /* Stop the timer if needed */ | |
660 | if (!cpu_throttle_get_percentage()) { | |
661 | return; | |
662 | } | |
663 | CPU_FOREACH(cpu) { | |
664 | if (!atomic_xchg(&cpu->throttle_thread_scheduled, 1)) { | |
665 | async_run_on_cpu(cpu, cpu_throttle_thread, | |
666 | RUN_ON_CPU_NULL); | |
667 | } | |
668 | } | |
669 | ||
670 | pct = (double)cpu_throttle_get_percentage()/100; | |
671 | timer_mod(throttle_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT) + | |
672 | CPU_THROTTLE_TIMESLICE_NS / (1-pct)); | |
673 | } | |
674 | ||
675 | void cpu_throttle_set(int new_throttle_pct) | |
676 | { | |
677 | /* Ensure throttle percentage is within valid range */ | |
678 | new_throttle_pct = MIN(new_throttle_pct, CPU_THROTTLE_PCT_MAX); | |
679 | new_throttle_pct = MAX(new_throttle_pct, CPU_THROTTLE_PCT_MIN); | |
680 | ||
681 | atomic_set(&throttle_percentage, new_throttle_pct); | |
682 | ||
683 | timer_mod(throttle_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT) + | |
684 | CPU_THROTTLE_TIMESLICE_NS); | |
685 | } | |
686 | ||
687 | void cpu_throttle_stop(void) | |
688 | { | |
689 | atomic_set(&throttle_percentage, 0); | |
690 | } | |
691 | ||
692 | bool cpu_throttle_active(void) | |
693 | { | |
694 | return (cpu_throttle_get_percentage() != 0); | |
695 | } | |
696 | ||
697 | int cpu_throttle_get_percentage(void) | |
698 | { | |
699 | return atomic_read(&throttle_percentage); | |
700 | } | |
701 | ||
702 | void cpu_ticks_init(void) | |
703 | { | |
704 | seqlock_init(&timers_state.vm_clock_seqlock); | |
705 | vmstate_register(NULL, 0, &vmstate_timers, &timers_state); | |
706 | throttle_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT, | |
707 | cpu_throttle_timer_tick, NULL); | |
708 | } | |
709 | ||
710 | void configure_icount(QemuOpts *opts, Error **errp) | |
711 | { | |
712 | const char *option; | |
713 | char *rem_str = NULL; | |
714 | ||
715 | option = qemu_opt_get(opts, "shift"); | |
716 | if (!option) { | |
717 | if (qemu_opt_get(opts, "align") != NULL) { | |
718 | error_setg(errp, "Please specify shift option when using align"); | |
719 | } | |
720 | return; | |
721 | } | |
722 | ||
723 | icount_sleep = qemu_opt_get_bool(opts, "sleep", true); | |
724 | if (icount_sleep) { | |
725 | icount_warp_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT, | |
726 | icount_timer_cb, NULL); | |
727 | } | |
728 | ||
729 | icount_align_option = qemu_opt_get_bool(opts, "align", false); | |
730 | ||
731 | if (icount_align_option && !icount_sleep) { | |
732 | error_setg(errp, "align=on and sleep=off are incompatible"); | |
733 | } | |
734 | if (strcmp(option, "auto") != 0) { | |
735 | errno = 0; | |
736 | icount_time_shift = strtol(option, &rem_str, 0); | |
737 | if (errno != 0 || *rem_str != '\0' || !strlen(option)) { | |
738 | error_setg(errp, "icount: Invalid shift value"); | |
739 | } | |
740 | use_icount = 1; | |
741 | return; | |
742 | } else if (icount_align_option) { | |
743 | error_setg(errp, "shift=auto and align=on are incompatible"); | |
744 | } else if (!icount_sleep) { | |
745 | error_setg(errp, "shift=auto and sleep=off are incompatible"); | |
746 | } | |
747 | ||
748 | use_icount = 2; | |
749 | ||
750 | /* 125MIPS seems a reasonable initial guess at the guest speed. | |
751 | It will be corrected fairly quickly anyway. */ | |
752 | icount_time_shift = 3; | |
753 | ||
754 | /* Have both realtime and virtual time triggers for speed adjustment. | |
755 | The realtime trigger catches emulated time passing too slowly, | |
756 | the virtual time trigger catches emulated time passing too fast. | |
757 | Realtime triggers occur even when idle, so use them less frequently | |
758 | than VM triggers. */ | |
759 | icount_rt_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL_RT, | |
760 | icount_adjust_rt, NULL); | |
761 | timer_mod(icount_rt_timer, | |
762 | qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL_RT) + 1000); | |
763 | icount_vm_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, | |
764 | icount_adjust_vm, NULL); | |
765 | timer_mod(icount_vm_timer, | |
766 | qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + | |
767 | NANOSECONDS_PER_SECOND / 10); | |
768 | } | |
769 | ||
770 | /***********************************************************/ | |
771 | /* TCG vCPU kick timer | |
772 | * | |
773 | * The kick timer is responsible for moving single threaded vCPU | |
774 | * emulation on to the next vCPU. If more than one vCPU is running a | |
775 | * timer event with force a cpu->exit so the next vCPU can get | |
776 | * scheduled. | |
777 | * | |
778 | * The timer is removed if all vCPUs are idle and restarted again once | |
779 | * idleness is complete. | |
780 | */ | |
781 | ||
782 | static QEMUTimer *tcg_kick_vcpu_timer; | |
783 | static CPUState *tcg_current_rr_cpu; | |
784 | ||
785 | #define TCG_KICK_PERIOD (NANOSECONDS_PER_SECOND / 10) | |
786 | ||
787 | static inline int64_t qemu_tcg_next_kick(void) | |
788 | { | |
789 | return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + TCG_KICK_PERIOD; | |
790 | } | |
791 | ||
792 | /* Kick the currently round-robin scheduled vCPU */ | |
793 | static void qemu_cpu_kick_rr_cpu(void) | |
794 | { | |
795 | CPUState *cpu; | |
796 | do { | |
797 | cpu = atomic_mb_read(&tcg_current_rr_cpu); | |
798 | if (cpu) { | |
799 | cpu_exit(cpu); | |
800 | } | |
801 | } while (cpu != atomic_mb_read(&tcg_current_rr_cpu)); | |
802 | } | |
803 | ||
804 | static void kick_tcg_thread(void *opaque) | |
805 | { | |
806 | timer_mod(tcg_kick_vcpu_timer, qemu_tcg_next_kick()); | |
807 | qemu_cpu_kick_rr_cpu(); | |
808 | } | |
809 | ||
810 | static void start_tcg_kick_timer(void) | |
811 | { | |
812 | if (!mttcg_enabled && !tcg_kick_vcpu_timer && CPU_NEXT(first_cpu)) { | |
813 | tcg_kick_vcpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, | |
814 | kick_tcg_thread, NULL); | |
815 | timer_mod(tcg_kick_vcpu_timer, qemu_tcg_next_kick()); | |
816 | } | |
817 | } | |
818 | ||
819 | static void stop_tcg_kick_timer(void) | |
820 | { | |
821 | if (tcg_kick_vcpu_timer) { | |
822 | timer_del(tcg_kick_vcpu_timer); | |
823 | tcg_kick_vcpu_timer = NULL; | |
824 | } | |
825 | } | |
826 | ||
827 | /***********************************************************/ | |
828 | void hw_error(const char *fmt, ...) | |
829 | { | |
830 | va_list ap; | |
831 | CPUState *cpu; | |
832 | ||
833 | va_start(ap, fmt); | |
834 | fprintf(stderr, "qemu: hardware error: "); | |
835 | vfprintf(stderr, fmt, ap); | |
836 | fprintf(stderr, "\n"); | |
837 | CPU_FOREACH(cpu) { | |
838 | fprintf(stderr, "CPU #%d:\n", cpu->cpu_index); | |
839 | cpu_dump_state(cpu, stderr, fprintf, CPU_DUMP_FPU); | |
840 | } | |
841 | va_end(ap); | |
842 | abort(); | |
843 | } | |
844 | ||
845 | void cpu_synchronize_all_states(void) | |
846 | { | |
847 | CPUState *cpu; | |
848 | ||
849 | CPU_FOREACH(cpu) { | |
850 | cpu_synchronize_state(cpu); | |
851 | } | |
852 | } | |
853 | ||
854 | void cpu_synchronize_all_post_reset(void) | |
855 | { | |
856 | CPUState *cpu; | |
857 | ||
858 | CPU_FOREACH(cpu) { | |
859 | cpu_synchronize_post_reset(cpu); | |
860 | } | |
861 | } | |
862 | ||
863 | void cpu_synchronize_all_post_init(void) | |
864 | { | |
865 | CPUState *cpu; | |
866 | ||
867 | CPU_FOREACH(cpu) { | |
868 | cpu_synchronize_post_init(cpu); | |
869 | } | |
870 | } | |
871 | ||
872 | static int do_vm_stop(RunState state) | |
873 | { | |
874 | int ret = 0; | |
875 | ||
876 | if (runstate_is_running()) { | |
877 | cpu_disable_ticks(); | |
878 | pause_all_vcpus(); | |
879 | runstate_set(state); | |
880 | vm_state_notify(0, state); | |
881 | qapi_event_send_stop(&error_abort); | |
882 | } | |
883 | ||
884 | bdrv_drain_all(); | |
885 | replay_disable_events(); | |
886 | ret = bdrv_flush_all(); | |
887 | ||
888 | return ret; | |
889 | } | |
890 | ||
891 | static bool cpu_can_run(CPUState *cpu) | |
892 | { | |
893 | if (cpu->stop) { | |
894 | return false; | |
895 | } | |
896 | if (cpu_is_stopped(cpu)) { | |
897 | return false; | |
898 | } | |
899 | return true; | |
900 | } | |
901 | ||
902 | static void cpu_handle_guest_debug(CPUState *cpu) | |
903 | { | |
904 | gdb_set_stop_cpu(cpu); | |
905 | qemu_system_debug_request(); | |
906 | cpu->stopped = true; | |
907 | } | |
908 | ||
909 | #ifdef CONFIG_LINUX | |
910 | static void sigbus_reraise(void) | |
911 | { | |
912 | sigset_t set; | |
913 | struct sigaction action; | |
914 | ||
915 | memset(&action, 0, sizeof(action)); | |
916 | action.sa_handler = SIG_DFL; | |
917 | if (!sigaction(SIGBUS, &action, NULL)) { | |
918 | raise(SIGBUS); | |
919 | sigemptyset(&set); | |
920 | sigaddset(&set, SIGBUS); | |
921 | pthread_sigmask(SIG_UNBLOCK, &set, NULL); | |
922 | } | |
923 | perror("Failed to re-raise SIGBUS!\n"); | |
924 | abort(); | |
925 | } | |
926 | ||
927 | static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo, | |
928 | void *ctx) | |
929 | { | |
930 | if (kvm_on_sigbus(siginfo->ssi_code, | |
931 | (void *)(intptr_t)siginfo->ssi_addr)) { | |
932 | sigbus_reraise(); | |
933 | } | |
934 | } | |
935 | ||
936 | static void qemu_init_sigbus(void) | |
937 | { | |
938 | struct sigaction action; | |
939 | ||
940 | memset(&action, 0, sizeof(action)); | |
941 | action.sa_flags = SA_SIGINFO; | |
942 | action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler; | |
943 | sigaction(SIGBUS, &action, NULL); | |
944 | ||
945 | prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0); | |
946 | } | |
947 | ||
948 | static void qemu_kvm_eat_signals(CPUState *cpu) | |
949 | { | |
950 | struct timespec ts = { 0, 0 }; | |
951 | siginfo_t siginfo; | |
952 | sigset_t waitset; | |
953 | sigset_t chkset; | |
954 | int r; | |
955 | ||
956 | sigemptyset(&waitset); | |
957 | sigaddset(&waitset, SIG_IPI); | |
958 | sigaddset(&waitset, SIGBUS); | |
959 | ||
960 | do { | |
961 | r = sigtimedwait(&waitset, &siginfo, &ts); | |
962 | if (r == -1 && !(errno == EAGAIN || errno == EINTR)) { | |
963 | perror("sigtimedwait"); | |
964 | exit(1); | |
965 | } | |
966 | ||
967 | switch (r) { | |
968 | case SIGBUS: | |
969 | if (kvm_on_sigbus_vcpu(cpu, siginfo.si_code, siginfo.si_addr)) { | |
970 | sigbus_reraise(); | |
971 | } | |
972 | break; | |
973 | default: | |
974 | break; | |
975 | } | |
976 | ||
977 | r = sigpending(&chkset); | |
978 | if (r == -1) { | |
979 | perror("sigpending"); | |
980 | exit(1); | |
981 | } | |
982 | } while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS)); | |
983 | } | |
984 | ||
985 | #else /* !CONFIG_LINUX */ | |
986 | ||
987 | static void qemu_init_sigbus(void) | |
988 | { | |
989 | } | |
990 | ||
991 | static void qemu_kvm_eat_signals(CPUState *cpu) | |
992 | { | |
993 | } | |
994 | #endif /* !CONFIG_LINUX */ | |
995 | ||
996 | #ifndef _WIN32 | |
997 | static void dummy_signal(int sig) | |
998 | { | |
999 | } | |
1000 | ||
1001 | static void qemu_kvm_init_cpu_signals(CPUState *cpu) | |
1002 | { | |
1003 | int r; | |
1004 | sigset_t set; | |
1005 | struct sigaction sigact; | |
1006 | ||
1007 | memset(&sigact, 0, sizeof(sigact)); | |
1008 | sigact.sa_handler = dummy_signal; | |
1009 | sigaction(SIG_IPI, &sigact, NULL); | |
1010 | ||
1011 | pthread_sigmask(SIG_BLOCK, NULL, &set); | |
1012 | sigdelset(&set, SIG_IPI); | |
1013 | sigdelset(&set, SIGBUS); | |
1014 | r = kvm_set_signal_mask(cpu, &set); | |
1015 | if (r) { | |
1016 | fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r)); | |
1017 | exit(1); | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | #else /* _WIN32 */ | |
1022 | static void qemu_kvm_init_cpu_signals(CPUState *cpu) | |
1023 | { | |
1024 | abort(); | |
1025 | } | |
1026 | #endif /* _WIN32 */ | |
1027 | ||
1028 | static QemuMutex qemu_global_mutex; | |
1029 | ||
1030 | static QemuThread io_thread; | |
1031 | ||
1032 | /* cpu creation */ | |
1033 | static QemuCond qemu_cpu_cond; | |
1034 | /* system init */ | |
1035 | static QemuCond qemu_pause_cond; | |
1036 | ||
1037 | void qemu_init_cpu_loop(void) | |
1038 | { | |
1039 | qemu_init_sigbus(); | |
1040 | qemu_cond_init(&qemu_cpu_cond); | |
1041 | qemu_cond_init(&qemu_pause_cond); | |
1042 | qemu_mutex_init(&qemu_global_mutex); | |
1043 | ||
1044 | qemu_thread_get_self(&io_thread); | |
1045 | } | |
1046 | ||
1047 | void run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data) | |
1048 | { | |
1049 | do_run_on_cpu(cpu, func, data, &qemu_global_mutex); | |
1050 | } | |
1051 | ||
1052 | static void qemu_kvm_destroy_vcpu(CPUState *cpu) | |
1053 | { | |
1054 | if (kvm_destroy_vcpu(cpu) < 0) { | |
1055 | error_report("kvm_destroy_vcpu failed"); | |
1056 | exit(EXIT_FAILURE); | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | static void qemu_tcg_destroy_vcpu(CPUState *cpu) | |
1061 | { | |
1062 | } | |
1063 | ||
1064 | static void qemu_wait_io_event_common(CPUState *cpu) | |
1065 | { | |
1066 | atomic_mb_set(&cpu->thread_kicked, false); | |
1067 | if (cpu->stop) { | |
1068 | cpu->stop = false; | |
1069 | cpu->stopped = true; | |
1070 | qemu_cond_broadcast(&qemu_pause_cond); | |
1071 | } | |
1072 | process_queued_cpu_work(cpu); | |
1073 | } | |
1074 | ||
1075 | static bool qemu_tcg_should_sleep(CPUState *cpu) | |
1076 | { | |
1077 | if (mttcg_enabled) { | |
1078 | return cpu_thread_is_idle(cpu); | |
1079 | } else { | |
1080 | return all_cpu_threads_idle(); | |
1081 | } | |
1082 | } | |
1083 | ||
1084 | static void qemu_tcg_wait_io_event(CPUState *cpu) | |
1085 | { | |
1086 | while (qemu_tcg_should_sleep(cpu)) { | |
1087 | stop_tcg_kick_timer(); | |
1088 | qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex); | |
1089 | } | |
1090 | ||
1091 | start_tcg_kick_timer(); | |
1092 | ||
1093 | qemu_wait_io_event_common(cpu); | |
1094 | } | |
1095 | ||
1096 | static void qemu_kvm_wait_io_event(CPUState *cpu) | |
1097 | { | |
1098 | while (cpu_thread_is_idle(cpu)) { | |
1099 | qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex); | |
1100 | } | |
1101 | ||
1102 | qemu_kvm_eat_signals(cpu); | |
1103 | qemu_wait_io_event_common(cpu); | |
1104 | } | |
1105 | ||
1106 | static void *qemu_kvm_cpu_thread_fn(void *arg) | |
1107 | { | |
1108 | CPUState *cpu = arg; | |
1109 | int r; | |
1110 | ||
1111 | rcu_register_thread(); | |
1112 | ||
1113 | qemu_mutex_lock_iothread(); | |
1114 | qemu_thread_get_self(cpu->thread); | |
1115 | cpu->thread_id = qemu_get_thread_id(); | |
1116 | cpu->can_do_io = 1; | |
1117 | current_cpu = cpu; | |
1118 | ||
1119 | r = kvm_init_vcpu(cpu); | |
1120 | if (r < 0) { | |
1121 | fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r)); | |
1122 | exit(1); | |
1123 | } | |
1124 | ||
1125 | qemu_kvm_init_cpu_signals(cpu); | |
1126 | ||
1127 | /* signal CPU creation */ | |
1128 | cpu->created = true; | |
1129 | qemu_cond_signal(&qemu_cpu_cond); | |
1130 | ||
1131 | do { | |
1132 | if (cpu_can_run(cpu)) { | |
1133 | r = kvm_cpu_exec(cpu); | |
1134 | if (r == EXCP_DEBUG) { | |
1135 | cpu_handle_guest_debug(cpu); | |
1136 | } | |
1137 | } | |
1138 | qemu_kvm_wait_io_event(cpu); | |
1139 | } while (!cpu->unplug || cpu_can_run(cpu)); | |
1140 | ||
1141 | qemu_kvm_destroy_vcpu(cpu); | |
1142 | cpu->created = false; | |
1143 | qemu_cond_signal(&qemu_cpu_cond); | |
1144 | qemu_mutex_unlock_iothread(); | |
1145 | return NULL; | |
1146 | } | |
1147 | ||
1148 | static void *qemu_dummy_cpu_thread_fn(void *arg) | |
1149 | { | |
1150 | #ifdef _WIN32 | |
1151 | fprintf(stderr, "qtest is not supported under Windows\n"); | |
1152 | exit(1); | |
1153 | #else | |
1154 | CPUState *cpu = arg; | |
1155 | sigset_t waitset; | |
1156 | int r; | |
1157 | ||
1158 | rcu_register_thread(); | |
1159 | ||
1160 | qemu_mutex_lock_iothread(); | |
1161 | qemu_thread_get_self(cpu->thread); | |
1162 | cpu->thread_id = qemu_get_thread_id(); | |
1163 | cpu->can_do_io = 1; | |
1164 | current_cpu = cpu; | |
1165 | ||
1166 | sigemptyset(&waitset); | |
1167 | sigaddset(&waitset, SIG_IPI); | |
1168 | ||
1169 | /* signal CPU creation */ | |
1170 | cpu->created = true; | |
1171 | qemu_cond_signal(&qemu_cpu_cond); | |
1172 | ||
1173 | while (1) { | |
1174 | qemu_mutex_unlock_iothread(); | |
1175 | do { | |
1176 | int sig; | |
1177 | r = sigwait(&waitset, &sig); | |
1178 | } while (r == -1 && (errno == EAGAIN || errno == EINTR)); | |
1179 | if (r == -1) { | |
1180 | perror("sigwait"); | |
1181 | exit(1); | |
1182 | } | |
1183 | qemu_mutex_lock_iothread(); | |
1184 | qemu_wait_io_event_common(cpu); | |
1185 | } | |
1186 | ||
1187 | return NULL; | |
1188 | #endif | |
1189 | } | |
1190 | ||
1191 | static int64_t tcg_get_icount_limit(void) | |
1192 | { | |
1193 | int64_t deadline; | |
1194 | ||
1195 | if (replay_mode != REPLAY_MODE_PLAY) { | |
1196 | deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL); | |
1197 | ||
1198 | /* Maintain prior (possibly buggy) behaviour where if no deadline | |
1199 | * was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than | |
1200 | * INT32_MAX nanoseconds ahead, we still use INT32_MAX | |
1201 | * nanoseconds. | |
1202 | */ | |
1203 | if ((deadline < 0) || (deadline > INT32_MAX)) { | |
1204 | deadline = INT32_MAX; | |
1205 | } | |
1206 | ||
1207 | return qemu_icount_round(deadline); | |
1208 | } else { | |
1209 | return replay_get_instructions(); | |
1210 | } | |
1211 | } | |
1212 | ||
1213 | static void handle_icount_deadline(void) | |
1214 | { | |
1215 | if (use_icount) { | |
1216 | int64_t deadline = | |
1217 | qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL); | |
1218 | ||
1219 | if (deadline == 0) { | |
1220 | qemu_clock_notify(QEMU_CLOCK_VIRTUAL); | |
1221 | } | |
1222 | } | |
1223 | } | |
1224 | ||
1225 | static int tcg_cpu_exec(CPUState *cpu) | |
1226 | { | |
1227 | int ret; | |
1228 | #ifdef CONFIG_PROFILER | |
1229 | int64_t ti; | |
1230 | #endif | |
1231 | ||
1232 | #ifdef CONFIG_PROFILER | |
1233 | ti = profile_getclock(); | |
1234 | #endif | |
1235 | if (use_icount) { | |
1236 | int64_t count; | |
1237 | int decr; | |
1238 | timers_state.qemu_icount -= (cpu->icount_decr.u16.low | |
1239 | + cpu->icount_extra); | |
1240 | cpu->icount_decr.u16.low = 0; | |
1241 | cpu->icount_extra = 0; | |
1242 | count = tcg_get_icount_limit(); | |
1243 | timers_state.qemu_icount += count; | |
1244 | decr = (count > 0xffff) ? 0xffff : count; | |
1245 | count -= decr; | |
1246 | cpu->icount_decr.u16.low = decr; | |
1247 | cpu->icount_extra = count; | |
1248 | } | |
1249 | qemu_mutex_unlock_iothread(); | |
1250 | cpu_exec_start(cpu); | |
1251 | ret = cpu_exec(cpu); | |
1252 | cpu_exec_end(cpu); | |
1253 | qemu_mutex_lock_iothread(); | |
1254 | #ifdef CONFIG_PROFILER | |
1255 | tcg_time += profile_getclock() - ti; | |
1256 | #endif | |
1257 | if (use_icount) { | |
1258 | /* Fold pending instructions back into the | |
1259 | instruction counter, and clear the interrupt flag. */ | |
1260 | timers_state.qemu_icount -= (cpu->icount_decr.u16.low | |
1261 | + cpu->icount_extra); | |
1262 | cpu->icount_decr.u32 = 0; | |
1263 | cpu->icount_extra = 0; | |
1264 | replay_account_executed_instructions(); | |
1265 | } | |
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 | if (!cpu) { | |
1334 | cpu = first_cpu; | |
1335 | } | |
1336 | ||
1337 | while (cpu && !cpu->queued_work_first && !cpu->exit_request) { | |
1338 | ||
1339 | atomic_mb_set(&tcg_current_rr_cpu, cpu); | |
1340 | current_cpu = cpu; | |
1341 | ||
1342 | qemu_clock_enable(QEMU_CLOCK_VIRTUAL, | |
1343 | (cpu->singlestep_enabled & SSTEP_NOTIMER) == 0); | |
1344 | ||
1345 | if (cpu_can_run(cpu)) { | |
1346 | int r; | |
1347 | r = tcg_cpu_exec(cpu); | |
1348 | if (r == EXCP_DEBUG) { | |
1349 | cpu_handle_guest_debug(cpu); | |
1350 | break; | |
1351 | } else if (r == EXCP_ATOMIC) { | |
1352 | qemu_mutex_unlock_iothread(); | |
1353 | cpu_exec_step_atomic(cpu); | |
1354 | qemu_mutex_lock_iothread(); | |
1355 | break; | |
1356 | } | |
1357 | } else if (cpu->stop) { | |
1358 | if (cpu->unplug) { | |
1359 | cpu = CPU_NEXT(cpu); | |
1360 | } | |
1361 | break; | |
1362 | } | |
1363 | ||
1364 | cpu = CPU_NEXT(cpu); | |
1365 | } /* while (cpu && !cpu->exit_request).. */ | |
1366 | ||
1367 | /* Does not need atomic_mb_set because a spurious wakeup is okay. */ | |
1368 | atomic_set(&tcg_current_rr_cpu, NULL); | |
1369 | ||
1370 | if (cpu && cpu->exit_request) { | |
1371 | atomic_mb_set(&cpu->exit_request, 0); | |
1372 | } | |
1373 | ||
1374 | handle_icount_deadline(); | |
1375 | ||
1376 | qemu_tcg_wait_io_event(cpu ? cpu : QTAILQ_FIRST(&cpus)); | |
1377 | deal_with_unplugged_cpus(); | |
1378 | } | |
1379 | ||
1380 | return NULL; | |
1381 | } | |
1382 | ||
1383 | static void *qemu_hax_cpu_thread_fn(void *arg) | |
1384 | { | |
1385 | CPUState *cpu = arg; | |
1386 | int r; | |
1387 | qemu_thread_get_self(cpu->thread); | |
1388 | qemu_mutex_lock(&qemu_global_mutex); | |
1389 | ||
1390 | cpu->thread_id = qemu_get_thread_id(); | |
1391 | cpu->created = true; | |
1392 | cpu->halted = 0; | |
1393 | current_cpu = cpu; | |
1394 | ||
1395 | hax_init_vcpu(cpu); | |
1396 | qemu_cond_signal(&qemu_cpu_cond); | |
1397 | ||
1398 | while (1) { | |
1399 | if (cpu_can_run(cpu)) { | |
1400 | r = hax_smp_cpu_exec(cpu); | |
1401 | if (r == EXCP_DEBUG) { | |
1402 | cpu_handle_guest_debug(cpu); | |
1403 | } | |
1404 | } | |
1405 | ||
1406 | while (cpu_thread_is_idle(cpu)) { | |
1407 | qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex); | |
1408 | } | |
1409 | #ifdef _WIN32 | |
1410 | SleepEx(0, TRUE); | |
1411 | #endif | |
1412 | qemu_wait_io_event_common(cpu); | |
1413 | } | |
1414 | return NULL; | |
1415 | } | |
1416 | ||
1417 | #ifdef _WIN32 | |
1418 | static void CALLBACK dummy_apc_func(ULONG_PTR unused) | |
1419 | { | |
1420 | } | |
1421 | #endif | |
1422 | ||
1423 | /* Multi-threaded TCG | |
1424 | * | |
1425 | * In the multi-threaded case each vCPU has its own thread. The TLS | |
1426 | * variable current_cpu can be used deep in the code to find the | |
1427 | * current CPUState for a given thread. | |
1428 | */ | |
1429 | ||
1430 | static void *qemu_tcg_cpu_thread_fn(void *arg) | |
1431 | { | |
1432 | CPUState *cpu = arg; | |
1433 | ||
1434 | rcu_register_thread(); | |
1435 | ||
1436 | qemu_mutex_lock_iothread(); | |
1437 | qemu_thread_get_self(cpu->thread); | |
1438 | ||
1439 | cpu->thread_id = qemu_get_thread_id(); | |
1440 | cpu->created = true; | |
1441 | cpu->can_do_io = 1; | |
1442 | current_cpu = cpu; | |
1443 | qemu_cond_signal(&qemu_cpu_cond); | |
1444 | ||
1445 | /* process any pending work */ | |
1446 | cpu->exit_request = 1; | |
1447 | ||
1448 | while (1) { | |
1449 | if (cpu_can_run(cpu)) { | |
1450 | int r; | |
1451 | r = tcg_cpu_exec(cpu); | |
1452 | switch (r) { | |
1453 | case EXCP_DEBUG: | |
1454 | cpu_handle_guest_debug(cpu); | |
1455 | break; | |
1456 | case EXCP_HALTED: | |
1457 | /* during start-up the vCPU is reset and the thread is | |
1458 | * kicked several times. If we don't ensure we go back | |
1459 | * to sleep in the halted state we won't cleanly | |
1460 | * start-up when the vCPU is enabled. | |
1461 | * | |
1462 | * cpu->halted should ensure we sleep in wait_io_event | |
1463 | */ | |
1464 | g_assert(cpu->halted); | |
1465 | break; | |
1466 | case EXCP_ATOMIC: | |
1467 | qemu_mutex_unlock_iothread(); | |
1468 | cpu_exec_step_atomic(cpu); | |
1469 | qemu_mutex_lock_iothread(); | |
1470 | default: | |
1471 | /* Ignore everything else? */ | |
1472 | break; | |
1473 | } | |
1474 | } | |
1475 | ||
1476 | handle_icount_deadline(); | |
1477 | ||
1478 | atomic_mb_set(&cpu->exit_request, 0); | |
1479 | qemu_tcg_wait_io_event(cpu); | |
1480 | } | |
1481 | ||
1482 | return NULL; | |
1483 | } | |
1484 | ||
1485 | static void qemu_cpu_kick_thread(CPUState *cpu) | |
1486 | { | |
1487 | #ifndef _WIN32 | |
1488 | int err; | |
1489 | ||
1490 | if (cpu->thread_kicked) { | |
1491 | return; | |
1492 | } | |
1493 | cpu->thread_kicked = true; | |
1494 | err = pthread_kill(cpu->thread->thread, SIG_IPI); | |
1495 | if (err) { | |
1496 | fprintf(stderr, "qemu:%s: %s", __func__, strerror(err)); | |
1497 | exit(1); | |
1498 | } | |
1499 | #else /* _WIN32 */ | |
1500 | if (!qemu_cpu_is_self(cpu)) { | |
1501 | if (!QueueUserAPC(dummy_apc_func, cpu->hThread, 0)) { | |
1502 | fprintf(stderr, "%s: QueueUserAPC failed with error %lu\n", | |
1503 | __func__, GetLastError()); | |
1504 | exit(1); | |
1505 | } | |
1506 | } | |
1507 | #endif | |
1508 | } | |
1509 | ||
1510 | void qemu_cpu_kick(CPUState *cpu) | |
1511 | { | |
1512 | qemu_cond_broadcast(cpu->halt_cond); | |
1513 | if (tcg_enabled()) { | |
1514 | cpu_exit(cpu); | |
1515 | /* NOP unless doing single-thread RR */ | |
1516 | qemu_cpu_kick_rr_cpu(); | |
1517 | } else { | |
1518 | if (hax_enabled()) { | |
1519 | /* | |
1520 | * FIXME: race condition with the exit_request check in | |
1521 | * hax_vcpu_hax_exec | |
1522 | */ | |
1523 | cpu->exit_request = 1; | |
1524 | } | |
1525 | qemu_cpu_kick_thread(cpu); | |
1526 | } | |
1527 | } | |
1528 | ||
1529 | void qemu_cpu_kick_self(void) | |
1530 | { | |
1531 | assert(current_cpu); | |
1532 | qemu_cpu_kick_thread(current_cpu); | |
1533 | } | |
1534 | ||
1535 | bool qemu_cpu_is_self(CPUState *cpu) | |
1536 | { | |
1537 | return qemu_thread_is_self(cpu->thread); | |
1538 | } | |
1539 | ||
1540 | bool qemu_in_vcpu_thread(void) | |
1541 | { | |
1542 | return current_cpu && qemu_cpu_is_self(current_cpu); | |
1543 | } | |
1544 | ||
1545 | static __thread bool iothread_locked = false; | |
1546 | ||
1547 | bool qemu_mutex_iothread_locked(void) | |
1548 | { | |
1549 | return iothread_locked; | |
1550 | } | |
1551 | ||
1552 | void qemu_mutex_lock_iothread(void) | |
1553 | { | |
1554 | g_assert(!qemu_mutex_iothread_locked()); | |
1555 | qemu_mutex_lock(&qemu_global_mutex); | |
1556 | iothread_locked = true; | |
1557 | } | |
1558 | ||
1559 | void qemu_mutex_unlock_iothread(void) | |
1560 | { | |
1561 | g_assert(qemu_mutex_iothread_locked()); | |
1562 | iothread_locked = false; | |
1563 | qemu_mutex_unlock(&qemu_global_mutex); | |
1564 | } | |
1565 | ||
1566 | static bool all_vcpus_paused(void) | |
1567 | { | |
1568 | CPUState *cpu; | |
1569 | ||
1570 | CPU_FOREACH(cpu) { | |
1571 | if (!cpu->stopped) { | |
1572 | return false; | |
1573 | } | |
1574 | } | |
1575 | ||
1576 | return true; | |
1577 | } | |
1578 | ||
1579 | void pause_all_vcpus(void) | |
1580 | { | |
1581 | CPUState *cpu; | |
1582 | ||
1583 | qemu_clock_enable(QEMU_CLOCK_VIRTUAL, false); | |
1584 | CPU_FOREACH(cpu) { | |
1585 | cpu->stop = true; | |
1586 | qemu_cpu_kick(cpu); | |
1587 | } | |
1588 | ||
1589 | if (qemu_in_vcpu_thread()) { | |
1590 | cpu_stop_current(); | |
1591 | } | |
1592 | ||
1593 | while (!all_vcpus_paused()) { | |
1594 | qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex); | |
1595 | CPU_FOREACH(cpu) { | |
1596 | qemu_cpu_kick(cpu); | |
1597 | } | |
1598 | } | |
1599 | } | |
1600 | ||
1601 | void cpu_resume(CPUState *cpu) | |
1602 | { | |
1603 | cpu->stop = false; | |
1604 | cpu->stopped = false; | |
1605 | qemu_cpu_kick(cpu); | |
1606 | } | |
1607 | ||
1608 | void resume_all_vcpus(void) | |
1609 | { | |
1610 | CPUState *cpu; | |
1611 | ||
1612 | qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true); | |
1613 | CPU_FOREACH(cpu) { | |
1614 | cpu_resume(cpu); | |
1615 | } | |
1616 | } | |
1617 | ||
1618 | void cpu_remove(CPUState *cpu) | |
1619 | { | |
1620 | cpu->stop = true; | |
1621 | cpu->unplug = true; | |
1622 | qemu_cpu_kick(cpu); | |
1623 | } | |
1624 | ||
1625 | void cpu_remove_sync(CPUState *cpu) | |
1626 | { | |
1627 | cpu_remove(cpu); | |
1628 | while (cpu->created) { | |
1629 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
1630 | } | |
1631 | } | |
1632 | ||
1633 | /* For temporary buffers for forming a name */ | |
1634 | #define VCPU_THREAD_NAME_SIZE 16 | |
1635 | ||
1636 | static void qemu_tcg_init_vcpu(CPUState *cpu) | |
1637 | { | |
1638 | char thread_name[VCPU_THREAD_NAME_SIZE]; | |
1639 | static QemuCond *single_tcg_halt_cond; | |
1640 | static QemuThread *single_tcg_cpu_thread; | |
1641 | ||
1642 | if (qemu_tcg_mttcg_enabled() || !single_tcg_cpu_thread) { | |
1643 | cpu->thread = g_malloc0(sizeof(QemuThread)); | |
1644 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); | |
1645 | qemu_cond_init(cpu->halt_cond); | |
1646 | ||
1647 | if (qemu_tcg_mttcg_enabled()) { | |
1648 | /* create a thread per vCPU with TCG (MTTCG) */ | |
1649 | parallel_cpus = true; | |
1650 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/TCG", | |
1651 | cpu->cpu_index); | |
1652 | ||
1653 | qemu_thread_create(cpu->thread, thread_name, qemu_tcg_cpu_thread_fn, | |
1654 | cpu, QEMU_THREAD_JOINABLE); | |
1655 | ||
1656 | } else { | |
1657 | /* share a single thread for all cpus with TCG */ | |
1658 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "ALL CPUs/TCG"); | |
1659 | qemu_thread_create(cpu->thread, thread_name, | |
1660 | qemu_tcg_rr_cpu_thread_fn, | |
1661 | cpu, QEMU_THREAD_JOINABLE); | |
1662 | ||
1663 | single_tcg_halt_cond = cpu->halt_cond; | |
1664 | single_tcg_cpu_thread = cpu->thread; | |
1665 | } | |
1666 | #ifdef _WIN32 | |
1667 | cpu->hThread = qemu_thread_get_handle(cpu->thread); | |
1668 | #endif | |
1669 | while (!cpu->created) { | |
1670 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
1671 | } | |
1672 | } else { | |
1673 | /* For non-MTTCG cases we share the thread */ | |
1674 | cpu->thread = single_tcg_cpu_thread; | |
1675 | cpu->halt_cond = single_tcg_halt_cond; | |
1676 | } | |
1677 | } | |
1678 | ||
1679 | static void qemu_hax_start_vcpu(CPUState *cpu) | |
1680 | { | |
1681 | char thread_name[VCPU_THREAD_NAME_SIZE]; | |
1682 | ||
1683 | cpu->thread = g_malloc0(sizeof(QemuThread)); | |
1684 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); | |
1685 | qemu_cond_init(cpu->halt_cond); | |
1686 | ||
1687 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/HAX", | |
1688 | cpu->cpu_index); | |
1689 | qemu_thread_create(cpu->thread, thread_name, qemu_hax_cpu_thread_fn, | |
1690 | cpu, QEMU_THREAD_JOINABLE); | |
1691 | #ifdef _WIN32 | |
1692 | cpu->hThread = qemu_thread_get_handle(cpu->thread); | |
1693 | #endif | |
1694 | while (!cpu->created) { | |
1695 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
1696 | } | |
1697 | } | |
1698 | ||
1699 | static void qemu_kvm_start_vcpu(CPUState *cpu) | |
1700 | { | |
1701 | char thread_name[VCPU_THREAD_NAME_SIZE]; | |
1702 | ||
1703 | cpu->thread = g_malloc0(sizeof(QemuThread)); | |
1704 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); | |
1705 | qemu_cond_init(cpu->halt_cond); | |
1706 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/KVM", | |
1707 | cpu->cpu_index); | |
1708 | qemu_thread_create(cpu->thread, thread_name, qemu_kvm_cpu_thread_fn, | |
1709 | cpu, QEMU_THREAD_JOINABLE); | |
1710 | while (!cpu->created) { | |
1711 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
1712 | } | |
1713 | } | |
1714 | ||
1715 | static void qemu_dummy_start_vcpu(CPUState *cpu) | |
1716 | { | |
1717 | char thread_name[VCPU_THREAD_NAME_SIZE]; | |
1718 | ||
1719 | cpu->thread = g_malloc0(sizeof(QemuThread)); | |
1720 | cpu->halt_cond = g_malloc0(sizeof(QemuCond)); | |
1721 | qemu_cond_init(cpu->halt_cond); | |
1722 | snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY", | |
1723 | cpu->cpu_index); | |
1724 | qemu_thread_create(cpu->thread, thread_name, qemu_dummy_cpu_thread_fn, cpu, | |
1725 | QEMU_THREAD_JOINABLE); | |
1726 | while (!cpu->created) { | |
1727 | qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex); | |
1728 | } | |
1729 | } | |
1730 | ||
1731 | void qemu_init_vcpu(CPUState *cpu) | |
1732 | { | |
1733 | cpu->nr_cores = smp_cores; | |
1734 | cpu->nr_threads = smp_threads; | |
1735 | cpu->stopped = true; | |
1736 | ||
1737 | if (!cpu->as) { | |
1738 | /* If the target cpu hasn't set up any address spaces itself, | |
1739 | * give it the default one. | |
1740 | */ | |
1741 | AddressSpace *as = address_space_init_shareable(cpu->memory, | |
1742 | "cpu-memory"); | |
1743 | cpu->num_ases = 1; | |
1744 | cpu_address_space_init(cpu, as, 0); | |
1745 | } | |
1746 | ||
1747 | if (kvm_enabled()) { | |
1748 | qemu_kvm_start_vcpu(cpu); | |
1749 | } else if (hax_enabled()) { | |
1750 | qemu_hax_start_vcpu(cpu); | |
1751 | } else if (tcg_enabled()) { | |
1752 | qemu_tcg_init_vcpu(cpu); | |
1753 | } else { | |
1754 | qemu_dummy_start_vcpu(cpu); | |
1755 | } | |
1756 | } | |
1757 | ||
1758 | void cpu_stop_current(void) | |
1759 | { | |
1760 | if (current_cpu) { | |
1761 | current_cpu->stop = false; | |
1762 | current_cpu->stopped = true; | |
1763 | cpu_exit(current_cpu); | |
1764 | qemu_cond_broadcast(&qemu_pause_cond); | |
1765 | } | |
1766 | } | |
1767 | ||
1768 | int vm_stop(RunState state) | |
1769 | { | |
1770 | if (qemu_in_vcpu_thread()) { | |
1771 | qemu_system_vmstop_request_prepare(); | |
1772 | qemu_system_vmstop_request(state); | |
1773 | /* | |
1774 | * FIXME: should not return to device code in case | |
1775 | * vm_stop() has been requested. | |
1776 | */ | |
1777 | cpu_stop_current(); | |
1778 | return 0; | |
1779 | } | |
1780 | ||
1781 | return do_vm_stop(state); | |
1782 | } | |
1783 | ||
1784 | /** | |
1785 | * Prepare for (re)starting the VM. | |
1786 | * Returns -1 if the vCPUs are not to be restarted (e.g. if they are already | |
1787 | * running or in case of an error condition), 0 otherwise. | |
1788 | */ | |
1789 | int vm_prepare_start(void) | |
1790 | { | |
1791 | RunState requested; | |
1792 | int res = 0; | |
1793 | ||
1794 | qemu_vmstop_requested(&requested); | |
1795 | if (runstate_is_running() && requested == RUN_STATE__MAX) { | |
1796 | return -1; | |
1797 | } | |
1798 | ||
1799 | /* Ensure that a STOP/RESUME pair of events is emitted if a | |
1800 | * vmstop request was pending. The BLOCK_IO_ERROR event, for | |
1801 | * example, according to documentation is always followed by | |
1802 | * the STOP event. | |
1803 | */ | |
1804 | if (runstate_is_running()) { | |
1805 | qapi_event_send_stop(&error_abort); | |
1806 | res = -1; | |
1807 | } else { | |
1808 | replay_enable_events(); | |
1809 | cpu_enable_ticks(); | |
1810 | runstate_set(RUN_STATE_RUNNING); | |
1811 | vm_state_notify(1, RUN_STATE_RUNNING); | |
1812 | } | |
1813 | ||
1814 | /* We are sending this now, but the CPUs will be resumed shortly later */ | |
1815 | qapi_event_send_resume(&error_abort); | |
1816 | return res; | |
1817 | } | |
1818 | ||
1819 | void vm_start(void) | |
1820 | { | |
1821 | if (!vm_prepare_start()) { | |
1822 | resume_all_vcpus(); | |
1823 | } | |
1824 | } | |
1825 | ||
1826 | /* does a state transition even if the VM is already stopped, | |
1827 | current state is forgotten forever */ | |
1828 | int vm_stop_force_state(RunState state) | |
1829 | { | |
1830 | if (runstate_is_running()) { | |
1831 | return vm_stop(state); | |
1832 | } else { | |
1833 | runstate_set(state); | |
1834 | ||
1835 | bdrv_drain_all(); | |
1836 | /* Make sure to return an error if the flush in a previous vm_stop() | |
1837 | * failed. */ | |
1838 | return bdrv_flush_all(); | |
1839 | } | |
1840 | } | |
1841 | ||
1842 | void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) | |
1843 | { | |
1844 | /* XXX: implement xxx_cpu_list for targets that still miss it */ | |
1845 | #if defined(cpu_list) | |
1846 | cpu_list(f, cpu_fprintf); | |
1847 | #endif | |
1848 | } | |
1849 | ||
1850 | CpuInfoList *qmp_query_cpus(Error **errp) | |
1851 | { | |
1852 | CpuInfoList *head = NULL, *cur_item = NULL; | |
1853 | CPUState *cpu; | |
1854 | ||
1855 | CPU_FOREACH(cpu) { | |
1856 | CpuInfoList *info; | |
1857 | #if defined(TARGET_I386) | |
1858 | X86CPU *x86_cpu = X86_CPU(cpu); | |
1859 | CPUX86State *env = &x86_cpu->env; | |
1860 | #elif defined(TARGET_PPC) | |
1861 | PowerPCCPU *ppc_cpu = POWERPC_CPU(cpu); | |
1862 | CPUPPCState *env = &ppc_cpu->env; | |
1863 | #elif defined(TARGET_SPARC) | |
1864 | SPARCCPU *sparc_cpu = SPARC_CPU(cpu); | |
1865 | CPUSPARCState *env = &sparc_cpu->env; | |
1866 | #elif defined(TARGET_MIPS) | |
1867 | MIPSCPU *mips_cpu = MIPS_CPU(cpu); | |
1868 | CPUMIPSState *env = &mips_cpu->env; | |
1869 | #elif defined(TARGET_TRICORE) | |
1870 | TriCoreCPU *tricore_cpu = TRICORE_CPU(cpu); | |
1871 | CPUTriCoreState *env = &tricore_cpu->env; | |
1872 | #endif | |
1873 | ||
1874 | cpu_synchronize_state(cpu); | |
1875 | ||
1876 | info = g_malloc0(sizeof(*info)); | |
1877 | info->value = g_malloc0(sizeof(*info->value)); | |
1878 | info->value->CPU = cpu->cpu_index; | |
1879 | info->value->current = (cpu == first_cpu); | |
1880 | info->value->halted = cpu->halted; | |
1881 | info->value->qom_path = object_get_canonical_path(OBJECT(cpu)); | |
1882 | info->value->thread_id = cpu->thread_id; | |
1883 | #if defined(TARGET_I386) | |
1884 | info->value->arch = CPU_INFO_ARCH_X86; | |
1885 | info->value->u.x86.pc = env->eip + env->segs[R_CS].base; | |
1886 | #elif defined(TARGET_PPC) | |
1887 | info->value->arch = CPU_INFO_ARCH_PPC; | |
1888 | info->value->u.ppc.nip = env->nip; | |
1889 | #elif defined(TARGET_SPARC) | |
1890 | info->value->arch = CPU_INFO_ARCH_SPARC; | |
1891 | info->value->u.q_sparc.pc = env->pc; | |
1892 | info->value->u.q_sparc.npc = env->npc; | |
1893 | #elif defined(TARGET_MIPS) | |
1894 | info->value->arch = CPU_INFO_ARCH_MIPS; | |
1895 | info->value->u.q_mips.PC = env->active_tc.PC; | |
1896 | #elif defined(TARGET_TRICORE) | |
1897 | info->value->arch = CPU_INFO_ARCH_TRICORE; | |
1898 | info->value->u.tricore.PC = env->PC; | |
1899 | #else | |
1900 | info->value->arch = CPU_INFO_ARCH_OTHER; | |
1901 | #endif | |
1902 | ||
1903 | /* XXX: waiting for the qapi to support GSList */ | |
1904 | if (!cur_item) { | |
1905 | head = cur_item = info; | |
1906 | } else { | |
1907 | cur_item->next = info; | |
1908 | cur_item = info; | |
1909 | } | |
1910 | } | |
1911 | ||
1912 | return head; | |
1913 | } | |
1914 | ||
1915 | void qmp_memsave(int64_t addr, int64_t size, const char *filename, | |
1916 | bool has_cpu, int64_t cpu_index, Error **errp) | |
1917 | { | |
1918 | FILE *f; | |
1919 | uint32_t l; | |
1920 | CPUState *cpu; | |
1921 | uint8_t buf[1024]; | |
1922 | int64_t orig_addr = addr, orig_size = size; | |
1923 | ||
1924 | if (!has_cpu) { | |
1925 | cpu_index = 0; | |
1926 | } | |
1927 | ||
1928 | cpu = qemu_get_cpu(cpu_index); | |
1929 | if (cpu == NULL) { | |
1930 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index", | |
1931 | "a CPU number"); | |
1932 | return; | |
1933 | } | |
1934 | ||
1935 | f = fopen(filename, "wb"); | |
1936 | if (!f) { | |
1937 | error_setg_file_open(errp, errno, filename); | |
1938 | return; | |
1939 | } | |
1940 | ||
1941 | while (size != 0) { | |
1942 | l = sizeof(buf); | |
1943 | if (l > size) | |
1944 | l = size; | |
1945 | if (cpu_memory_rw_debug(cpu, addr, buf, l, 0) != 0) { | |
1946 | error_setg(errp, "Invalid addr 0x%016" PRIx64 "/size %" PRId64 | |
1947 | " specified", orig_addr, orig_size); | |
1948 | goto exit; | |
1949 | } | |
1950 | if (fwrite(buf, 1, l, f) != l) { | |
1951 | error_setg(errp, QERR_IO_ERROR); | |
1952 | goto exit; | |
1953 | } | |
1954 | addr += l; | |
1955 | size -= l; | |
1956 | } | |
1957 | ||
1958 | exit: | |
1959 | fclose(f); | |
1960 | } | |
1961 | ||
1962 | void qmp_pmemsave(int64_t addr, int64_t size, const char *filename, | |
1963 | Error **errp) | |
1964 | { | |
1965 | FILE *f; | |
1966 | uint32_t l; | |
1967 | uint8_t buf[1024]; | |
1968 | ||
1969 | f = fopen(filename, "wb"); | |
1970 | if (!f) { | |
1971 | error_setg_file_open(errp, errno, filename); | |
1972 | return; | |
1973 | } | |
1974 | ||
1975 | while (size != 0) { | |
1976 | l = sizeof(buf); | |
1977 | if (l > size) | |
1978 | l = size; | |
1979 | cpu_physical_memory_read(addr, buf, l); | |
1980 | if (fwrite(buf, 1, l, f) != l) { | |
1981 | error_setg(errp, QERR_IO_ERROR); | |
1982 | goto exit; | |
1983 | } | |
1984 | addr += l; | |
1985 | size -= l; | |
1986 | } | |
1987 | ||
1988 | exit: | |
1989 | fclose(f); | |
1990 | } | |
1991 | ||
1992 | void qmp_inject_nmi(Error **errp) | |
1993 | { | |
1994 | nmi_monitor_handle(monitor_get_cpu_index(), errp); | |
1995 | } | |
1996 | ||
1997 | void dump_drift_info(FILE *f, fprintf_function cpu_fprintf) | |
1998 | { | |
1999 | if (!use_icount) { | |
2000 | return; | |
2001 | } | |
2002 | ||
2003 | cpu_fprintf(f, "Host - Guest clock %"PRIi64" ms\n", | |
2004 | (cpu_get_clock() - cpu_get_icount())/SCALE_MS); | |
2005 | if (icount_align_option) { | |
2006 | cpu_fprintf(f, "Max guest delay %"PRIi64" ms\n", -max_delay/SCALE_MS); | |
2007 | cpu_fprintf(f, "Max guest advance %"PRIi64" ms\n", max_advance/SCALE_MS); | |
2008 | } else { | |
2009 | cpu_fprintf(f, "Max guest delay NA\n"); | |
2010 | cpu_fprintf(f, "Max guest advance NA\n"); | |
2011 | } | |
2012 | } |