cpus.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 /* Needed early for CONFIG_BSD etc. */
  26 #include "config-host.h"
  27
  28 #include "monitor.h"
  29 #include "sysemu.h"
  30 #include "gdbstub.h"
  31 #include "dma.h"
  32 #include "kvm.h"
  33 #include "qmp-commands.h"
  34
  35 #include "qemu-thread.h"
  36 #include "cpus.h"
  37 #include "qtest.h"
  38 #include "main-loop.h"
  39 #include "bitmap.h"
  40
  41 #ifndef _WIN32
  42 #include "compatfd.h"
  43 #endif
  44
  45 #ifdef CONFIG_LINUX
  46
  47 #include <sys/prctl.h>
  48
  49 #ifndef PR_MCE_KILL
  50 #define PR_MCE_KILL 33
  51 #endif
  52
  53 #ifndef PR_MCE_KILL_SET
  54 #define PR_MCE_KILL_SET 1
  55 #endif
  56
  57 #ifndef PR_MCE_KILL_EARLY
  58 #define PR_MCE_KILL_EARLY 1
  59 #endif
  60
  61 #endif /* CONFIG_LINUX */
  62
  63 static CPUArchState *next_cpu;
  64
  65 static bool cpu_thread_is_idle(CPUArchState *env)
  66 {
  67     CPUState *cpu = ENV_GET_CPU(env);
  68
  69     if (cpu->stop || cpu->queued_work_first) {
  70         return false;
  71     }
  72     if (cpu->stopped || !runstate_is_running()) {
  73         return true;
  74     }
  75     if (!env->halted || qemu_cpu_has_work(env) ||
  76         kvm_async_interrupts_enabled()) {
  77         return false;
  78     }
  79     return true;
  80 }
  81
  82 static bool all_cpu_threads_idle(void)
  83 {
  84     CPUArchState *env;
  85
  86     for (env = first_cpu; env != NULL; env = env->next_cpu) {
  87         if (!cpu_thread_is_idle(env)) {
  88             return false;
  89         }
  90     }
  91     return true;
  92 }
  93
  94 /***********************************************************/
  95 /* guest cycle counter */
  96
  97 /* Conversion factor from emulated instructions to virtual clock ticks.  */
  98 static int icount_time_shift;
  99 /* Arbitrarily pick 1MIPS as the minimum allowable speed.  */
 100 #define MAX_ICOUNT_SHIFT 10
 101 /* Compensate for varying guest execution speed.  */
 102 static int64_t qemu_icount_bias;
 103 static QEMUTimer *icount_rt_timer;
 104 static QEMUTimer *icount_vm_timer;
 105 static QEMUTimer *icount_warp_timer;
 106 static int64_t vm_clock_warp_start;
 107 static int64_t qemu_icount;
 108
 109 typedef struct TimersState {
 110     int64_t cpu_ticks_prev;
 111     int64_t cpu_ticks_offset;
 112     int64_t cpu_clock_offset;
 113     int32_t cpu_ticks_enabled;
 114     int64_t dummy;
 115 } TimersState;
 116
 117 TimersState timers_state;
 118
 119 /* Return the virtual CPU time, based on the instruction counter.  */
 120 int64_t cpu_get_icount(void)
 121 {
 122     int64_t icount;
 123     CPUArchState *env = cpu_single_env;
 124
 125     icount = qemu_icount;
 126     if (env) {
 127         if (!can_do_io(env)) {
 128             fprintf(stderr, "Bad clock read\n");
 129         }
 130         icount -= (env->icount_decr.u16.low + env->icount_extra);
 131     }
 132     return qemu_icount_bias + (icount << icount_time_shift);
 133 }
 134
 135 /* return the host CPU cycle counter and handle stop/restart */
 136 int64_t cpu_get_ticks(void)
 137 {
 138     if (use_icount) {
 139         return cpu_get_icount();
 140     }
 141     if (!timers_state.cpu_ticks_enabled) {
 142         return timers_state.cpu_ticks_offset;
 143     } else {
 144         int64_t ticks;
 145         ticks = cpu_get_real_ticks();
 146         if (timers_state.cpu_ticks_prev > ticks) {
 147             /* Note: non increasing ticks may happen if the host uses
 148                software suspend */
 149             timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks;
 150         }
 151         timers_state.cpu_ticks_prev = ticks;
 152         return ticks + timers_state.cpu_ticks_offset;
 153     }
 154 }
 155
 156 /* return the host CPU monotonic timer and handle stop/restart */
 157 int64_t cpu_get_clock(void)
 158 {
 159     int64_t ti;
 160     if (!timers_state.cpu_ticks_enabled) {
 161         return timers_state.cpu_clock_offset;
 162     } else {
 163         ti = get_clock();
 164         return ti + timers_state.cpu_clock_offset;
 165     }
 166 }
 167
 168 /* enable cpu_get_ticks() */
 169 void cpu_enable_ticks(void)
 170 {
 171     if (!timers_state.cpu_ticks_enabled) {
 172         timers_state.cpu_ticks_offset -= cpu_get_real_ticks();
 173         timers_state.cpu_clock_offset -= get_clock();
 174         timers_state.cpu_ticks_enabled = 1;
 175     }
 176 }
 177
 178 /* disable cpu_get_ticks() : the clock is stopped. You must not call
 179    cpu_get_ticks() after that.  */
 180 void cpu_disable_ticks(void)
 181 {
 182     if (timers_state.cpu_ticks_enabled) {
 183         timers_state.cpu_ticks_offset = cpu_get_ticks();
 184         timers_state.cpu_clock_offset = cpu_get_clock();
 185         timers_state.cpu_ticks_enabled = 0;
 186     }
 187 }
 188
 189 /* Correlation between real and virtual time is always going to be
 190    fairly approximate, so ignore small variation.
 191    When the guest is idle real and virtual time will be aligned in
 192    the IO wait loop.  */
 193 #define ICOUNT_WOBBLE (get_ticks_per_sec() / 10)
 194
 195 static void icount_adjust(void)
 196 {
 197     int64_t cur_time;
 198     int64_t cur_icount;
 199     int64_t delta;
 200     static int64_t last_delta;
 201     /* If the VM is not running, then do nothing.  */
 202     if (!runstate_is_running()) {
 203         return;
 204     }
 205     cur_time = cpu_get_clock();
 206     cur_icount = qemu_get_clock_ns(vm_clock);
 207     delta = cur_icount - cur_time;
 208     /* FIXME: This is a very crude algorithm, somewhat prone to oscillation.  */
 209     if (delta > 0
 210         && last_delta + ICOUNT_WOBBLE < delta * 2
 211         && icount_time_shift > 0) {
 212         /* The guest is getting too far ahead.  Slow time down.  */
 213         icount_time_shift--;
 214     }
 215     if (delta < 0
 216         && last_delta - ICOUNT_WOBBLE > delta * 2
 217         && icount_time_shift < MAX_ICOUNT_SHIFT) {
 218         /* The guest is getting too far behind.  Speed time up.  */
 219         icount_time_shift++;
 220     }
 221     last_delta = delta;
 222     qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift);
 223 }
 224
 225 static void icount_adjust_rt(void *opaque)
 226 {
 227     qemu_mod_timer(icount_rt_timer,
 228                    qemu_get_clock_ms(rt_clock) + 1000);
 229     icount_adjust();
 230 }
 231
 232 static void icount_adjust_vm(void *opaque)
 233 {
 234     qemu_mod_timer(icount_vm_timer,
 235                    qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
 236     icount_adjust();
 237 }
 238
 239 static int64_t qemu_icount_round(int64_t count)
 240 {
 241     return (count + (1 << icount_time_shift) - 1) >> icount_time_shift;
 242 }
 243
 244 static void icount_warp_rt(void *opaque)
 245 {
 246     if (vm_clock_warp_start == -1) {
 247         return;
 248     }
 249
 250     if (runstate_is_running()) {
 251         int64_t clock = qemu_get_clock_ns(rt_clock);
 252         int64_t warp_delta = clock - vm_clock_warp_start;
 253         if (use_icount == 1) {
 254             qemu_icount_bias += warp_delta;
 255         } else {
 256             /*
 257              * In adaptive mode, do not let the vm_clock run too
 258              * far ahead of real time.
 259              */
 260             int64_t cur_time = cpu_get_clock();
 261             int64_t cur_icount = qemu_get_clock_ns(vm_clock);
 262             int64_t delta = cur_time - cur_icount;
 263             qemu_icount_bias += MIN(warp_delta, delta);
 264         }
 265         if (qemu_clock_expired(vm_clock)) {
 266             qemu_notify_event();
 267         }
 268     }
 269     vm_clock_warp_start = -1;
 270 }
 271
 272 void qtest_clock_warp(int64_t dest)
 273 {
 274     int64_t clock = qemu_get_clock_ns(vm_clock);
 275     assert(qtest_enabled());
 276     while (clock < dest) {
 277         int64_t deadline = qemu_clock_deadline(vm_clock);
 278         int64_t warp = MIN(dest - clock, deadline);
 279         qemu_icount_bias += warp;
 280         qemu_run_timers(vm_clock);
 281         clock = qemu_get_clock_ns(vm_clock);
 282     }
 283     qemu_notify_event();
 284 }
 285
 286 void qemu_clock_warp(QEMUClock *clock)
 287 {
 288     int64_t deadline;
 289
 290     /*
 291      * There are too many global variables to make the "warp" behavior
 292      * applicable to other clocks.  But a clock argument removes the
 293      * need for if statements all over the place.
 294      */
 295     if (clock != vm_clock || !use_icount) {
 296         return;
 297     }
 298
 299     /*
 300      * If the CPUs have been sleeping, advance the vm_clock timer now.  This
 301      * ensures that the deadline for the timer is computed correctly below.
 302      * This also makes sure that the insn counter is synchronized before the
 303      * CPU starts running, in case the CPU is woken by an event other than
 304      * the earliest vm_clock timer.
 305      */
 306     icount_warp_rt(NULL);
 307     if (!all_cpu_threads_idle() || !qemu_clock_has_timers(vm_clock)) {
 308         qemu_del_timer(icount_warp_timer);
 309         return;
 310     }
 311
 312     if (qtest_enabled()) {
 313         /* When testing, qtest commands advance icount.  */
 314         return;
 315     }
 316
 317     vm_clock_warp_start = qemu_get_clock_ns(rt_clock);
 318     deadline = qemu_clock_deadline(vm_clock);
 319     if (deadline > 0) {
 320         /*
 321          * Ensure the vm_clock proceeds even when the virtual CPU goes to
 322          * sleep.  Otherwise, the CPU might be waiting for a future timer
 323          * interrupt to wake it up, but the interrupt never comes because
 324          * the vCPU isn't running any insns and thus doesn't advance the
 325          * vm_clock.
 326          *
 327          * An extreme solution for this problem would be to never let VCPUs
 328          * sleep in icount mode if there is a pending vm_clock timer; rather
 329          * time could just advance to the next vm_clock event.  Instead, we
 330          * do stop VCPUs and only advance vm_clock after some "real" time,
 331          * (related to the time left until the next event) has passed.  This
 332          * rt_clock timer will do this.  This avoids that the warps are too
 333          * visible externally---for example, you will not be sending network
 334          * packets continuously instead of every 100ms.
 335          */
 336         qemu_mod_timer(icount_warp_timer, vm_clock_warp_start + deadline);
 337     } else {
 338         qemu_notify_event();
 339     }
 340 }
 341
 342 static const VMStateDescription vmstate_timers = {
 343     .name = "timer",
 344     .version_id = 2,
 345     .minimum_version_id = 1,
 346     .minimum_version_id_old = 1,
 347     .fields      = (VMStateField[]) {
 348         VMSTATE_INT64(cpu_ticks_offset, TimersState),
 349         VMSTATE_INT64(dummy, TimersState),
 350         VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2),
 351         VMSTATE_END_OF_LIST()
 352     }
 353 };
 354
 355 void configure_icount(const char *option)
 356 {
 357     vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
 358     if (!option) {
 359         return;
 360     }
 361
 362     icount_warp_timer = qemu_new_timer_ns(rt_clock, icount_warp_rt, NULL);
 363     if (strcmp(option, "auto") != 0) {
 364         icount_time_shift = strtol(option, NULL, 0);
 365         use_icount = 1;
 366         return;
 367     }
 368
 369     use_icount = 2;
 370
 371     /* 125MIPS seems a reasonable initial guess at the guest speed.
 372        It will be corrected fairly quickly anyway.  */
 373     icount_time_shift = 3;
 374
 375     /* Have both realtime and virtual time triggers for speed adjustment.
 376        The realtime trigger catches emulated time passing too slowly,
 377        the virtual time trigger catches emulated time passing too fast.
 378        Realtime triggers occur even when idle, so use them less frequently
 379        than VM triggers.  */
 380     icount_rt_timer = qemu_new_timer_ms(rt_clock, icount_adjust_rt, NULL);
 381     qemu_mod_timer(icount_rt_timer,
 382                    qemu_get_clock_ms(rt_clock) + 1000);
 383     icount_vm_timer = qemu_new_timer_ns(vm_clock, icount_adjust_vm, NULL);
 384     qemu_mod_timer(icount_vm_timer,
 385                    qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
 386 }
 387
 388 /***********************************************************/
 389 void hw_error(const char *fmt, ...)
 390 {
 391     va_list ap;
 392     CPUArchState *env;
 393
 394     va_start(ap, fmt);
 395     fprintf(stderr, "qemu: hardware error: ");
 396     vfprintf(stderr, fmt, ap);
 397     fprintf(stderr, "\n");
 398     for(env = first_cpu; env != NULL; env = env->next_cpu) {
 399         fprintf(stderr, "CPU #%d:\n", env->cpu_index);
 400         cpu_dump_state(env, stderr, fprintf, CPU_DUMP_FPU);
 401     }
 402     va_end(ap);
 403     abort();
 404 }
 405
 406 void cpu_synchronize_all_states(void)
 407 {
 408     CPUArchState *cpu;
 409
 410     for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
 411         cpu_synchronize_state(cpu);
 412     }
 413 }
 414
 415 void cpu_synchronize_all_post_reset(void)
 416 {
 417     CPUArchState *cpu;
 418
 419     for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
 420         cpu_synchronize_post_reset(cpu);
 421     }
 422 }
 423
 424 void cpu_synchronize_all_post_init(void)
 425 {
 426     CPUArchState *cpu;
 427
 428     for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
 429         cpu_synchronize_post_init(cpu);
 430     }
 431 }
 432
 433 bool cpu_is_stopped(CPUState *cpu)
 434 {
 435     return !runstate_is_running() || cpu->stopped;
 436 }
 437
 438 static void do_vm_stop(RunState state)
 439 {
 440     if (runstate_is_running()) {
 441         cpu_disable_ticks();
 442         pause_all_vcpus();
 443         runstate_set(state);
 444         vm_state_notify(0, state);
 445         bdrv_drain_all();
 446         bdrv_flush_all();
 447         monitor_protocol_event(QEVENT_STOP, NULL);
 448     }
 449 }
 450
 451 static bool cpu_can_run(CPUState *cpu)
 452 {
 453     if (cpu->stop) {
 454         return false;
 455     }
 456     if (cpu->stopped || !runstate_is_running()) {
 457         return false;
 458     }
 459     return true;
 460 }
 461
 462 static void cpu_handle_guest_debug(CPUArchState *env)
 463 {
 464     CPUState *cpu = ENV_GET_CPU(env);
 465
 466     gdb_set_stop_cpu(env);
 467     qemu_system_debug_request();
 468     cpu->stopped = true;
 469 }
 470
 471 static void cpu_signal(int sig)
 472 {
 473     if (cpu_single_env) {
 474         cpu_exit(cpu_single_env);
 475     }
 476     exit_request = 1;
 477 }
 478
 479 #ifdef CONFIG_LINUX
 480 static void sigbus_reraise(void)
 481 {
 482     sigset_t set;
 483     struct sigaction action;
 484
 485     memset(&action, 0, sizeof(action));
 486     action.sa_handler = SIG_DFL;
 487     if (!sigaction(SIGBUS, &action, NULL)) {
 488         raise(SIGBUS);
 489         sigemptyset(&set);
 490         sigaddset(&set, SIGBUS);
 491         sigprocmask(SIG_UNBLOCK, &set, NULL);
 492     }
 493     perror("Failed to re-raise SIGBUS!\n");
 494     abort();
 495 }
 496
 497 static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo,
 498                            void *ctx)
 499 {
 500     if (kvm_on_sigbus(siginfo->ssi_code,
 501                       (void *)(intptr_t)siginfo->ssi_addr)) {
 502         sigbus_reraise();
 503     }
 504 }
 505
 506 static void qemu_init_sigbus(void)
 507 {
 508     struct sigaction action;
 509
 510     memset(&action, 0, sizeof(action));
 511     action.sa_flags = SA_SIGINFO;
 512     action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler;
 513     sigaction(SIGBUS, &action, NULL);
 514
 515     prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0);
 516 }
 517
 518 static void qemu_kvm_eat_signals(CPUArchState *env)
 519 {
 520     struct timespec ts = { 0, 0 };
 521     siginfo_t siginfo;
 522     sigset_t waitset;
 523     sigset_t chkset;
 524     int r;
 525
 526     sigemptyset(&waitset);
 527     sigaddset(&waitset, SIG_IPI);
 528     sigaddset(&waitset, SIGBUS);
 529
 530     do {
 531         r = sigtimedwait(&waitset, &siginfo, &ts);
 532         if (r == -1 && !(errno == EAGAIN || errno == EINTR)) {
 533             perror("sigtimedwait");
 534             exit(1);
 535         }
 536
 537         switch (r) {
 538         case SIGBUS:
 539             if (kvm_on_sigbus_vcpu(env, siginfo.si_code, siginfo.si_addr)) {
 540                 sigbus_reraise();
 541             }
 542             break;
 543         default:
 544             break;
 545         }
 546
 547         r = sigpending(&chkset);
 548         if (r == -1) {
 549             perror("sigpending");
 550             exit(1);
 551         }
 552     } while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
 553 }
 554
 555 #else /* !CONFIG_LINUX */
 556
 557 static void qemu_init_sigbus(void)
 558 {
 559 }
 560
 561 static void qemu_kvm_eat_signals(CPUArchState *env)
 562 {
 563 }
 564 #endif /* !CONFIG_LINUX */
 565
 566 #ifndef _WIN32
 567 static void dummy_signal(int sig)
 568 {
 569 }
 570
 571 static void qemu_kvm_init_cpu_signals(CPUArchState *env)
 572 {
 573     int r;
 574     sigset_t set;
 575     struct sigaction sigact;
 576
 577     memset(&sigact, 0, sizeof(sigact));
 578     sigact.sa_handler = dummy_signal;
 579     sigaction(SIG_IPI, &sigact, NULL);
 580
 581     pthread_sigmask(SIG_BLOCK, NULL, &set);
 582     sigdelset(&set, SIG_IPI);
 583     sigdelset(&set, SIGBUS);
 584     r = kvm_set_signal_mask(env, &set);
 585     if (r) {
 586         fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
 587         exit(1);
 588     }
 589 }
 590
 591 static void qemu_tcg_init_cpu_signals(void)
 592 {
 593     sigset_t set;
 594     struct sigaction sigact;
 595
 596     memset(&sigact, 0, sizeof(sigact));
 597     sigact.sa_handler = cpu_signal;
 598     sigaction(SIG_IPI, &sigact, NULL);
 599
 600     sigemptyset(&set);
 601     sigaddset(&set, SIG_IPI);
 602     pthread_sigmask(SIG_UNBLOCK, &set, NULL);
 603 }
 604
 605 #else /* _WIN32 */
 606 static void qemu_kvm_init_cpu_signals(CPUArchState *env)
 607 {
 608     abort();
 609 }
 610
 611 static void qemu_tcg_init_cpu_signals(void)
 612 {
 613 }
 614 #endif /* _WIN32 */
 615
 616 static QemuMutex qemu_global_mutex;
 617 static QemuCond qemu_io_proceeded_cond;
 618 static bool iothread_requesting_mutex;
 619
 620 static QemuThread io_thread;
 621
 622 static QemuThread *tcg_cpu_thread;
 623 static QemuCond *tcg_halt_cond;
 624
 625 /* cpu creation */
 626 static QemuCond qemu_cpu_cond;
 627 /* system init */
 628 static QemuCond qemu_pause_cond;
 629 static QemuCond qemu_work_cond;
 630
 631 void qemu_init_cpu_loop(void)
 632 {
 633     qemu_init_sigbus();
 634     qemu_cond_init(&qemu_cpu_cond);
 635     qemu_cond_init(&qemu_pause_cond);
 636     qemu_cond_init(&qemu_work_cond);
 637     qemu_cond_init(&qemu_io_proceeded_cond);
 638     qemu_mutex_init(&qemu_global_mutex);
 639
 640     qemu_thread_get_self(&io_thread);
 641 }
 642
 643 void run_on_cpu(CPUArchState *env, void (*func)(void *data), void *data)
 644 {
 645     CPUState *cpu = ENV_GET_CPU(env);
 646     struct qemu_work_item wi;
 647
 648     if (qemu_cpu_is_self(cpu)) {
 649         func(data);
 650         return;
 651     }
 652
 653     wi.func = func;
 654     wi.data = data;
 655     if (cpu->queued_work_first == NULL) {
 656         cpu->queued_work_first = &wi;
 657     } else {
 658         cpu->queued_work_last->next = &wi;
 659     }
 660     cpu->queued_work_last = &wi;
 661     wi.next = NULL;
 662     wi.done = false;
 663
 664     qemu_cpu_kick(cpu);
 665     while (!wi.done) {
 666         CPUArchState *self_env = cpu_single_env;
 667
 668         qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex);
 669         cpu_single_env = self_env;
 670     }
 671 }
 672
 673 static void flush_queued_work(CPUState *cpu)
 674 {
 675     struct qemu_work_item *wi;
 676
 677     if (cpu->queued_work_first == NULL) {
 678         return;
 679     }
 680
 681     while ((wi = cpu->queued_work_first)) {
 682         cpu->queued_work_first = wi->next;
 683         wi->func(wi->data);
 684         wi->done = true;
 685     }
 686     cpu->queued_work_last = NULL;
 687     qemu_cond_broadcast(&qemu_work_cond);
 688 }
 689
 690 static void qemu_wait_io_event_common(CPUState *cpu)
 691 {
 692     if (cpu->stop) {
 693         cpu->stop = false;
 694         cpu->stopped = true;
 695         qemu_cond_signal(&qemu_pause_cond);
 696     }
 697     flush_queued_work(cpu);
 698     cpu->thread_kicked = false;
 699 }
 700
 701 static void qemu_tcg_wait_io_event(void)
 702 {
 703     CPUArchState *env;
 704
 705     while (all_cpu_threads_idle()) {
 706        /* Start accounting real time to the virtual clock if the CPUs
 707           are idle.  */
 708         qemu_clock_warp(vm_clock);
 709         qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex);
 710     }
 711
 712     while (iothread_requesting_mutex) {
 713         qemu_cond_wait(&qemu_io_proceeded_cond, &qemu_global_mutex);
 714     }
 715
 716     for (env = first_cpu; env != NULL; env = env->next_cpu) {
 717         qemu_wait_io_event_common(ENV_GET_CPU(env));
 718     }
 719 }
 720
 721 static void qemu_kvm_wait_io_event(CPUArchState *env)
 722 {
 723     CPUState *cpu = ENV_GET_CPU(env);
 724
 725     while (cpu_thread_is_idle(env)) {
 726         qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex);
 727     }
 728
 729     qemu_kvm_eat_signals(env);
 730     qemu_wait_io_event_common(cpu);
 731 }
 732
 733 static void *qemu_kvm_cpu_thread_fn(void *arg)
 734 {
 735     CPUArchState *env = arg;
 736     CPUState *cpu = ENV_GET_CPU(env);
 737     int r;
 738
 739     qemu_mutex_lock(&qemu_global_mutex);
 740     qemu_thread_get_self(cpu->thread);
 741     env->thread_id = qemu_get_thread_id();
 742     cpu_single_env = env;
 743
 744     r = kvm_init_vcpu(env);
 745     if (r < 0) {
 746         fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
 747         exit(1);
 748     }
 749
 750     qemu_kvm_init_cpu_signals(env);
 751
 752     /* signal CPU creation */
 753     cpu->created = true;
 754     qemu_cond_signal(&qemu_cpu_cond);
 755
 756     while (1) {
 757         if (cpu_can_run(cpu)) {
 758             r = kvm_cpu_exec(env);
 759             if (r == EXCP_DEBUG) {
 760                 cpu_handle_guest_debug(env);
 761             }
 762         }
 763         qemu_kvm_wait_io_event(env);
 764     }
 765
 766     return NULL;
 767 }
 768
 769 static void *qemu_dummy_cpu_thread_fn(void *arg)
 770 {
 771 #ifdef _WIN32
 772     fprintf(stderr, "qtest is not supported under Windows\n");
 773     exit(1);
 774 #else
 775     CPUArchState *env = arg;
 776     CPUState *cpu = ENV_GET_CPU(env);
 777     sigset_t waitset;
 778     int r;
 779
 780     qemu_mutex_lock_iothread();
 781     qemu_thread_get_self(cpu->thread);
 782     env->thread_id = qemu_get_thread_id();
 783
 784     sigemptyset(&waitset);
 785     sigaddset(&waitset, SIG_IPI);
 786
 787     /* signal CPU creation */
 788     cpu->created = true;
 789     qemu_cond_signal(&qemu_cpu_cond);
 790
 791     cpu_single_env = env;
 792     while (1) {
 793         cpu_single_env = NULL;
 794         qemu_mutex_unlock_iothread();
 795         do {
 796             int sig;
 797             r = sigwait(&waitset, &sig);
 798         } while (r == -1 && (errno == EAGAIN || errno == EINTR));
 799         if (r == -1) {
 800             perror("sigwait");
 801             exit(1);
 802         }
 803         qemu_mutex_lock_iothread();
 804         cpu_single_env = env;
 805         qemu_wait_io_event_common(cpu);
 806     }
 807
 808     return NULL;
 809 #endif
 810 }
 811
 812 static void tcg_exec_all(void);
 813
 814 static void *qemu_tcg_cpu_thread_fn(void *arg)
 815 {
 816     CPUState *cpu = arg;
 817     CPUArchState *env;
 818
 819     qemu_tcg_init_cpu_signals();
 820     qemu_thread_get_self(cpu->thread);
 821
 822     /* signal CPU creation */
 823     qemu_mutex_lock(&qemu_global_mutex);
 824     for (env = first_cpu; env != NULL; env = env->next_cpu) {
 825         cpu = ENV_GET_CPU(env);
 826         env->thread_id = qemu_get_thread_id();
 827         cpu->created = true;
 828     }
 829     qemu_cond_signal(&qemu_cpu_cond);
 830
 831     /* wait for initial kick-off after machine start */
 832     while (ENV_GET_CPU(first_cpu)->stopped) {
 833         qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex);
 834
 835         /* process any pending work */
 836         for (env = first_cpu; env != NULL; env = env->next_cpu) {
 837             qemu_wait_io_event_common(ENV_GET_CPU(env));
 838         }
 839     }
 840
 841     while (1) {
 842         tcg_exec_all();
 843         if (use_icount && qemu_clock_deadline(vm_clock) <= 0) {
 844             qemu_notify_event();
 845         }
 846         qemu_tcg_wait_io_event();
 847     }
 848
 849     return NULL;
 850 }
 851
 852 static void qemu_cpu_kick_thread(CPUState *cpu)
 853 {
 854 #ifndef _WIN32
 855     int err;
 856
 857     err = pthread_kill(cpu->thread->thread, SIG_IPI);
 858     if (err) {
 859         fprintf(stderr, "qemu:%s: %s", __func__, strerror(err));
 860         exit(1);
 861     }
 862 #else /* _WIN32 */
 863     if (!qemu_cpu_is_self(cpu)) {
 864         SuspendThread(cpu->hThread);
 865         cpu_signal(0);
 866         ResumeThread(cpu->hThread);
 867     }
 868 #endif
 869 }
 870
 871 void qemu_cpu_kick(CPUState *cpu)
 872 {
 873     qemu_cond_broadcast(cpu->halt_cond);
 874     if (!tcg_enabled() && !cpu->thread_kicked) {
 875         qemu_cpu_kick_thread(cpu);
 876         cpu->thread_kicked = true;
 877     }
 878 }
 879
 880 void qemu_cpu_kick_self(void)
 881 {
 882 #ifndef _WIN32
 883     assert(cpu_single_env);
 884     CPUState *cpu_single_cpu = ENV_GET_CPU(cpu_single_env);
 885
 886     if (!cpu_single_cpu->thread_kicked) {
 887         qemu_cpu_kick_thread(cpu_single_cpu);
 888         cpu_single_cpu->thread_kicked = true;
 889     }
 890 #else
 891     abort();
 892 #endif
 893 }
 894
 895 bool qemu_cpu_is_self(CPUState *cpu)
 896 {
 897     return qemu_thread_is_self(cpu->thread);
 898 }
 899
 900 static bool qemu_in_vcpu_thread(void)
 901 {
 902     return cpu_single_env && qemu_cpu_is_self(ENV_GET_CPU(cpu_single_env));
 903 }
 904
 905 void qemu_mutex_lock_iothread(void)
 906 {
 907     if (!tcg_enabled()) {
 908         qemu_mutex_lock(&qemu_global_mutex);
 909     } else {
 910         iothread_requesting_mutex = true;
 911         if (qemu_mutex_trylock(&qemu_global_mutex)) {
 912             qemu_cpu_kick_thread(ENV_GET_CPU(first_cpu));
 913             qemu_mutex_lock(&qemu_global_mutex);
 914         }
 915         iothread_requesting_mutex = false;
 916         qemu_cond_broadcast(&qemu_io_proceeded_cond);
 917     }
 918 }
 919
 920 void qemu_mutex_unlock_iothread(void)
 921 {
 922     qemu_mutex_unlock(&qemu_global_mutex);
 923 }
 924
 925 static int all_vcpus_paused(void)
 926 {
 927     CPUArchState *penv = first_cpu;
 928
 929     while (penv) {
 930         CPUState *pcpu = ENV_GET_CPU(penv);
 931         if (!pcpu->stopped) {
 932             return 0;
 933         }
 934         penv = penv->next_cpu;
 935     }
 936
 937     return 1;
 938 }
 939
 940 void pause_all_vcpus(void)
 941 {
 942     CPUArchState *penv = first_cpu;
 943
 944     qemu_clock_enable(vm_clock, false);
 945     while (penv) {
 946         CPUState *pcpu = ENV_GET_CPU(penv);
 947         pcpu->stop = true;
 948         qemu_cpu_kick(pcpu);
 949         penv = penv->next_cpu;
 950     }
 951
 952     if (qemu_in_vcpu_thread()) {
 953         cpu_stop_current();
 954         if (!kvm_enabled()) {
 955             while (penv) {
 956                 CPUState *pcpu = ENV_GET_CPU(penv);
 957                 pcpu->stop = 0;
 958                 pcpu->stopped = true;
 959                 penv = penv->next_cpu;
 960             }
 961             return;
 962         }
 963     }
 964
 965     while (!all_vcpus_paused()) {
 966         qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex);
 967         penv = first_cpu;
 968         while (penv) {
 969             qemu_cpu_kick(ENV_GET_CPU(penv));
 970             penv = penv->next_cpu;
 971         }
 972     }
 973 }
 974
 975 void resume_all_vcpus(void)
 976 {
 977     CPUArchState *penv = first_cpu;
 978
 979     qemu_clock_enable(vm_clock, true);
 980     while (penv) {
 981         CPUState *pcpu = ENV_GET_CPU(penv);
 982         pcpu->stop = false;
 983         pcpu->stopped = false;
 984         qemu_cpu_kick(pcpu);
 985         penv = penv->next_cpu;
 986     }
 987 }
 988
 989 static void qemu_tcg_init_vcpu(CPUState *cpu)
 990 {
 991     /* share a single thread for all cpus with TCG */
 992     if (!tcg_cpu_thread) {
 993         cpu->thread = g_malloc0(sizeof(QemuThread));
 994         cpu->halt_cond = g_malloc0(sizeof(QemuCond));
 995         qemu_cond_init(cpu->halt_cond);
 996         tcg_halt_cond = cpu->halt_cond;
 997         qemu_thread_create(cpu->thread, qemu_tcg_cpu_thread_fn, cpu,
 998                            QEMU_THREAD_JOINABLE);
 999 #ifdef _WIN32
1000         cpu->hThread = qemu_thread_get_handle(cpu->thread);
1001 #endif
1002         while (!cpu->created) {
1003             qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
1004         }
1005         tcg_cpu_thread = cpu->thread;
1006     } else {
1007         cpu->thread = tcg_cpu_thread;
1008         cpu->halt_cond = tcg_halt_cond;
1009     }
1010 }
1011
1012 static void qemu_kvm_start_vcpu(CPUArchState *env)
1013 {
1014     CPUState *cpu = ENV_GET_CPU(env);
1015
1016     cpu->thread = g_malloc0(sizeof(QemuThread));
1017     cpu->halt_cond = g_malloc0(sizeof(QemuCond));
1018     qemu_cond_init(cpu->halt_cond);
1019     qemu_thread_create(cpu->thread, qemu_kvm_cpu_thread_fn, env,
1020                        QEMU_THREAD_JOINABLE);
1021     while (!cpu->created) {
1022         qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
1023     }
1024 }
1025
1026 static void qemu_dummy_start_vcpu(CPUArchState *env)
1027 {
1028     CPUState *cpu = ENV_GET_CPU(env);
1029
1030     cpu->thread = g_malloc0(sizeof(QemuThread));
1031     cpu->halt_cond = g_malloc0(sizeof(QemuCond));
1032     qemu_cond_init(cpu->halt_cond);
1033     qemu_thread_create(cpu->thread, qemu_dummy_cpu_thread_fn, env,
1034                        QEMU_THREAD_JOINABLE);
1035     while (!cpu->created) {
1036         qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
1037     }
1038 }
1039
1040 void qemu_init_vcpu(void *_env)
1041 {
1042     CPUArchState *env = _env;
1043     CPUState *cpu = ENV_GET_CPU(env);
1044
1045     env->nr_cores = smp_cores;
1046     env->nr_threads = smp_threads;
1047     cpu->stopped = true;
1048     if (kvm_enabled()) {
1049         qemu_kvm_start_vcpu(env);
1050     } else if (tcg_enabled()) {
1051         qemu_tcg_init_vcpu(cpu);
1052     } else {
1053         qemu_dummy_start_vcpu(env);
1054     }
1055 }
1056
1057 void cpu_stop_current(void)
1058 {
1059     if (cpu_single_env) {
1060         CPUState *cpu_single_cpu = ENV_GET_CPU(cpu_single_env);
1061         cpu_single_cpu->stop = false;
1062         cpu_single_cpu->stopped = true;
1063         cpu_exit(cpu_single_env);
1064         qemu_cond_signal(&qemu_pause_cond);
1065     }
1066 }
1067
1068 void vm_stop(RunState state)
1069 {
1070     if (qemu_in_vcpu_thread()) {
1071         qemu_system_vmstop_request(state);
1072         /*
1073          * FIXME: should not return to device code in case
1074          * vm_stop() has been requested.
1075          */
1076         cpu_stop_current();
1077         return;
1078     }
1079     do_vm_stop(state);
1080 }
1081
1082 /* does a state transition even if the VM is already stopped,
1083    current state is forgotten forever */
1084 void vm_stop_force_state(RunState state)
1085 {
1086     if (runstate_is_running()) {
1087         vm_stop(state);
1088     } else {
1089         runstate_set(state);
1090     }
1091 }
1092
1093 static int tcg_cpu_exec(CPUArchState *env)
1094 {
1095     int ret;
1096 #ifdef CONFIG_PROFILER
1097     int64_t ti;
1098 #endif
1099
1100 #ifdef CONFIG_PROFILER
1101     ti = profile_getclock();
1102 #endif
1103     if (use_icount) {
1104         int64_t count;
1105         int decr;
1106         qemu_icount -= (env->icount_decr.u16.low + env->icount_extra);
1107         env->icount_decr.u16.low = 0;
1108         env->icount_extra = 0;
1109         count = qemu_icount_round(qemu_clock_deadline(vm_clock));
1110         qemu_icount += count;
1111         decr = (count > 0xffff) ? 0xffff : count;
1112         count -= decr;
1113         env->icount_decr.u16.low = decr;
1114         env->icount_extra = count;
1115     }
1116     ret = cpu_exec(env);
1117 #ifdef CONFIG_PROFILER
1118     qemu_time += profile_getclock() - ti;
1119 #endif
1120     if (use_icount) {
1121         /* Fold pending instructions back into the
1122            instruction counter, and clear the interrupt flag.  */
1123         qemu_icount -= (env->icount_decr.u16.low
1124                         + env->icount_extra);
1125         env->icount_decr.u32 = 0;
1126         env->icount_extra = 0;
1127     }
1128     return ret;
1129 }
1130
1131 static void tcg_exec_all(void)
1132 {
1133     int r;
1134
1135     /* Account partial waits to the vm_clock.  */
1136     qemu_clock_warp(vm_clock);
1137
1138     if (next_cpu == NULL) {
1139         next_cpu = first_cpu;
1140     }
1141     for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) {
1142         CPUArchState *env = next_cpu;
1143         CPUState *cpu = ENV_GET_CPU(env);
1144
1145         qemu_clock_enable(vm_clock,
1146                           (env->singlestep_enabled & SSTEP_NOTIMER) == 0);
1147
1148         if (cpu_can_run(cpu)) {
1149             r = tcg_cpu_exec(env);
1150             if (r == EXCP_DEBUG) {
1151                 cpu_handle_guest_debug(env);
1152                 break;
1153             }
1154         } else if (cpu->stop || cpu->stopped) {
1155             break;
1156         }
1157     }
1158     exit_request = 0;
1159 }
1160
1161 void set_numa_modes(void)
1162 {
1163     CPUArchState *env;
1164     int i;
1165
1166     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1167         for (i = 0; i < nb_numa_nodes; i++) {
1168             if (test_bit(env->cpu_index, node_cpumask[i])) {
1169                 env->numa_node = i;
1170             }
1171         }
1172     }
1173 }
1174
1175 void set_cpu_log(const char *optarg)
1176 {
1177     int mask;
1178     const CPULogItem *item;
1179
1180     mask = cpu_str_to_log_mask(optarg);
1181     if (!mask) {
1182         printf("Log items (comma separated):\n");
1183         for (item = cpu_log_items; item->mask != 0; item++) {
1184             printf("%-10s %s\n", item->name, item->help);
1185         }
1186         exit(1);
1187     }
1188     cpu_set_log(mask);
1189 }
1190
1191 void set_cpu_log_filename(const char *optarg)
1192 {
1193     cpu_set_log_filename(optarg);
1194 }
1195
1196 void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg)
1197 {
1198     /* XXX: implement xxx_cpu_list for targets that still miss it */
1199 #if defined(cpu_list)
1200     cpu_list(f, cpu_fprintf);
1201 #endif
1202 }
1203
1204 CpuInfoList *qmp_query_cpus(Error **errp)
1205 {
1206     CpuInfoList *head = NULL, *cur_item = NULL;
1207     CPUArchState *env;
1208
1209     for(env = first_cpu; env != NULL; env = env->next_cpu) {
1210         CpuInfoList *info;
1211
1212         cpu_synchronize_state(env);
1213
1214         info = g_malloc0(sizeof(*info));
1215         info->value = g_malloc0(sizeof(*info->value));
1216         info->value->CPU = env->cpu_index;
1217         info->value->current = (env == first_cpu);
1218         info->value->halted = env->halted;
1219         info->value->thread_id = env->thread_id;
1220 #if defined(TARGET_I386)
1221         info->value->has_pc = true;
1222         info->value->pc = env->eip + env->segs[R_CS].base;
1223 #elif defined(TARGET_PPC)
1224         info->value->has_nip = true;
1225         info->value->nip = env->nip;
1226 #elif defined(TARGET_SPARC)
1227         info->value->has_pc = true;
1228         info->value->pc = env->pc;
1229         info->value->has_npc = true;
1230         info->value->npc = env->npc;
1231 #elif defined(TARGET_MIPS)
1232         info->value->has_PC = true;
1233         info->value->PC = env->active_tc.PC;
1234 #endif
1235
1236         /* XXX: waiting for the qapi to support GSList */
1237         if (!cur_item) {
1238             head = cur_item = info;
1239         } else {
1240             cur_item->next = info;
1241             cur_item = info;
1242         }
1243     }
1244
1245     return head;
1246 }
1247
1248 void qmp_memsave(int64_t addr, int64_t size, const char *filename,
1249                  bool has_cpu, int64_t cpu_index, Error **errp)
1250 {
1251     FILE *f;
1252     uint32_t l;
1253     CPUArchState *env;
1254     uint8_t buf[1024];
1255
1256     if (!has_cpu) {
1257         cpu_index = 0;
1258     }
1259
1260     for (env = first_cpu; env; env = env->next_cpu) {
1261         if (cpu_index == env->cpu_index) {
1262             break;
1263         }
1264     }
1265
1266     if (env == NULL) {
1267         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index",
1268                   "a CPU number");
1269         return;
1270     }
1271
1272     f = fopen(filename, "wb");
1273     if (!f) {
1274         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
1275         return;
1276     }
1277
1278     while (size != 0) {
1279         l = sizeof(buf);
1280         if (l > size)
1281             l = size;
1282         cpu_memory_rw_debug(env, addr, buf, l, 0);
1283         if (fwrite(buf, 1, l, f) != l) {
1284             error_set(errp, QERR_IO_ERROR);
1285             goto exit;
1286         }
1287         addr += l;
1288         size -= l;
1289     }
1290
1291 exit:
1292     fclose(f);
1293 }
1294
1295 void qmp_pmemsave(int64_t addr, int64_t size, const char *filename,
1296                   Error **errp)
1297 {
1298     FILE *f;
1299     uint32_t l;
1300     uint8_t buf[1024];
1301
1302     f = fopen(filename, "wb");
1303     if (!f) {
1304         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
1305         return;
1306     }
1307
1308     while (size != 0) {
1309         l = sizeof(buf);
1310         if (l > size)
1311             l = size;
1312         cpu_physical_memory_rw(addr, buf, l, 0);
1313         if (fwrite(buf, 1, l, f) != l) {
1314             error_set(errp, QERR_IO_ERROR);
1315             goto exit;
1316         }
1317         addr += l;
1318         size -= l;
1319     }
1320
1321 exit:
1322     fclose(f);
1323 }
1324
1325 void qmp_inject_nmi(Error **errp)
1326 {
1327 #if defined(TARGET_I386)
1328     CPUArchState *env;
1329
1330     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1331         if (!env->apic_state) {
1332             cpu_interrupt(env, CPU_INTERRUPT_NMI);
1333         } else {
1334             apic_deliver_nmi(env->apic_state);
1335         }
1336     }
1337 #else
1338     error_set(errp, QERR_UNSUPPORTED);
1339 #endif
1340 }