accel/kvm/kvm-accel-ops.c

   1 /*
   2  * QEMU KVM support
   3  *
   4  * Copyright IBM, Corp. 2008
   5  *           Red Hat, Inc. 2008
   6  *
   7  * Authors:
   8  *  Anthony Liguori   <aliguori@us.ibm.com>
   9  *  Glauber Costa     <gcosta@redhat.com>
  10  *
  11  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  12  * See the COPYING file in the top-level directory.
  13  *
  14  */
  15
  16 #include "qemu/osdep.h"
  17 #include "qemu/error-report.h"
  18 #include "qemu/main-loop.h"
  19 #include "sysemu/kvm_int.h"
  20 #include "sysemu/runstate.h"
  21 #include "sysemu/cpus.h"
  22 #include "qemu/guest-random.h"
  23 #include "qapi/error.h"
  24
  25 #include "kvm-cpus.h"
  26
  27 static void *kvm_vcpu_thread_fn(void *arg)
  28 {
  29     CPUState *cpu = arg;
  30     int r;
  31
  32     rcu_register_thread();
  33
  34     qemu_mutex_lock_iothread();
  35     qemu_thread_get_self(cpu->thread);
  36     cpu->thread_id = qemu_get_thread_id();
  37     cpu->can_do_io = 1;
  38     current_cpu = cpu;
  39
  40     r = kvm_init_vcpu(cpu, &error_fatal);
  41     kvm_init_cpu_signals(cpu);
  42
  43     /* signal CPU creation */
  44     cpu_thread_signal_created(cpu);
  45     qemu_guest_random_seed_thread_part2(cpu->random_seed);
  46
  47     do {
  48         if (cpu_can_run(cpu)) {
  49             r = kvm_cpu_exec(cpu);
  50             if (r == EXCP_DEBUG) {
  51                 cpu_handle_guest_debug(cpu);
  52             }
  53         }
  54         qemu_wait_io_event(cpu);
  55     } while (!cpu->unplug || cpu_can_run(cpu));
  56
  57     kvm_destroy_vcpu(cpu);
  58     cpu_thread_signal_destroyed(cpu);
  59     qemu_mutex_unlock_iothread();
  60     rcu_unregister_thread();
  61     return NULL;
  62 }
  63
  64 static void kvm_start_vcpu_thread(CPUState *cpu)
  65 {
  66     char thread_name[VCPU_THREAD_NAME_SIZE];
  67
  68     cpu->thread = g_malloc0(sizeof(QemuThread));
  69     cpu->halt_cond = g_malloc0(sizeof(QemuCond));
  70     qemu_cond_init(cpu->halt_cond);
  71     snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/KVM",
  72              cpu->cpu_index);
  73     qemu_thread_create(cpu->thread, thread_name, kvm_vcpu_thread_fn,
  74                        cpu, QEMU_THREAD_JOINABLE);
  75 }
  76
  77 static bool kvm_vcpu_thread_is_idle(CPUState *cpu)
  78 {
  79     return !kvm_halt_in_kernel();
  80 }
  81
  82 static bool kvm_cpus_are_resettable(void)
  83 {
  84     return !kvm_enabled() || kvm_cpu_check_are_resettable();
  85 }
  86
  87 static void kvm_accel_ops_class_init(ObjectClass *oc, void *data)
  88 {
  89     AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
  90
  91     ops->create_vcpu_thread = kvm_start_vcpu_thread;
  92     ops->cpu_thread_is_idle = kvm_vcpu_thread_is_idle;
  93     ops->cpus_are_resettable = kvm_cpus_are_resettable;
  94     ops->synchronize_post_reset = kvm_cpu_synchronize_post_reset;
  95     ops->synchronize_post_init = kvm_cpu_synchronize_post_init;
  96     ops->synchronize_state = kvm_cpu_synchronize_state;
  97     ops->synchronize_pre_loadvm = kvm_cpu_synchronize_pre_loadvm;
  98 }
  99
 100 static const TypeInfo kvm_accel_ops_type = {
 101     .name = ACCEL_OPS_NAME("kvm"),
 102
 103     .parent = TYPE_ACCEL_OPS,
 104     .class_init = kvm_accel_ops_class_init,
 105     .abstract = true,
 106 };
 107
 108 static void kvm_accel_ops_register_types(void)
 109 {
 110     type_register_static(&kvm_accel_ops_type);
 111 }
 112 type_init(kvm_accel_ops_register_types);