accel/qtest/qtest-cpus.c

   1 /*
   2  * QTest accelerator code
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #include "qemu/osdep.h"
  15 #include "qemu/rcu.h"
  16 #include "qapi/error.h"
  17 #include "qemu/module.h"
  18 #include "qemu/option.h"
  19 #include "qemu/config-file.h"
  20 #include "sysemu/accel.h"
  21 #include "sysemu/qtest.h"
  22 #include "sysemu/cpus.h"
  23 #include "sysemu/cpu-timers.h"
  24 #include "qemu/guest-random.h"
  25 #include "qemu/main-loop.h"
  26 #include "hw/core/cpu.h"
  27
  28 #include "qtest-cpus.h"
  29
  30 static void *qtest_cpu_thread_fn(void *arg)
  31 {
  32 #ifdef _WIN32
  33     error_report("qtest is not supported under Windows");
  34     exit(1);
  35 #else
  36     CPUState *cpu = arg;
  37     sigset_t waitset;
  38     int r;
  39
  40     rcu_register_thread();
  41
  42     qemu_mutex_lock_iothread();
  43     qemu_thread_get_self(cpu->thread);
  44     cpu->thread_id = qemu_get_thread_id();
  45     cpu->can_do_io = 1;
  46     current_cpu = cpu;
  47
  48     sigemptyset(&waitset);
  49     sigaddset(&waitset, SIG_IPI);
  50
  51     /* signal CPU creation */
  52     cpu_thread_signal_created(cpu);
  53     qemu_guest_random_seed_thread_part2(cpu->random_seed);
  54
  55     do {
  56         qemu_mutex_unlock_iothread();
  57         do {
  58             int sig;
  59             r = sigwait(&waitset, &sig);
  60         } while (r == -1 && (errno == EAGAIN || errno == EINTR));
  61         if (r == -1) {
  62             perror("sigwait");
  63             exit(1);
  64         }
  65         qemu_mutex_lock_iothread();
  66         qemu_wait_io_event(cpu);
  67     } while (!cpu->unplug);
  68
  69     qemu_mutex_unlock_iothread();
  70     rcu_unregister_thread();
  71     return NULL;
  72 #endif
  73 }
  74
  75 static void qtest_start_vcpu_thread(CPUState *cpu)
  76 {
  77     char thread_name[VCPU_THREAD_NAME_SIZE];
  78
  79     cpu->thread = g_malloc0(sizeof(QemuThread));
  80     cpu->halt_cond = g_malloc0(sizeof(QemuCond));
  81     qemu_cond_init(cpu->halt_cond);
  82     snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY",
  83              cpu->cpu_index);
  84     qemu_thread_create(cpu->thread, thread_name, qtest_cpu_thread_fn, cpu,
  85                        QEMU_THREAD_JOINABLE);
  86 }
  87
  88 const CpusAccel qtest_cpus = {
  89     .create_vcpu_thread = qtest_start_vcpu_thread,
  90     .get_virtual_clock = qtest_get_virtual_clock,
  91 };