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.h"
  20 #include "sysemu/kvm_int.h"
  21 #include "sysemu/runstate.h"
  22 #include "sysemu/cpus.h"
  23 #include "qemu/guest-random.h"
  24 #include "qapi/error.h"
  25
  26 #include <linux/kvm.h>
  27 #include "kvm-cpus.h"
  28
  29 static void *kvm_vcpu_thread_fn(void *arg)
  30 {
  31     CPUState *cpu = arg;
  32     int r;
  33
  34     rcu_register_thread();
  35
  36     qemu_mutex_lock_iothread();
  37     qemu_thread_get_self(cpu->thread);
  38     cpu->thread_id = qemu_get_thread_id();
  39     cpu->can_do_io = 1;
  40     current_cpu = cpu;
  41
  42     r = kvm_init_vcpu(cpu, &error_fatal);
  43     kvm_init_cpu_signals(cpu);
  44
  45     /* signal CPU creation */
  46     cpu_thread_signal_created(cpu);
  47     qemu_guest_random_seed_thread_part2(cpu->random_seed);
  48
  49     do {
  50         if (cpu_can_run(cpu)) {
  51             r = kvm_cpu_exec(cpu);
  52             if (r == EXCP_DEBUG) {
  53                 cpu_handle_guest_debug(cpu);
  54             }
  55         }
  56         qemu_wait_io_event(cpu);
  57     } while (!cpu->unplug || cpu_can_run(cpu));
  58
  59     kvm_destroy_vcpu(cpu);
  60     cpu_thread_signal_destroyed(cpu);
  61     qemu_mutex_unlock_iothread();
  62     rcu_unregister_thread();
  63     return NULL;
  64 }
  65
  66 static void kvm_start_vcpu_thread(CPUState *cpu)
  67 {
  68     char thread_name[VCPU_THREAD_NAME_SIZE];
  69
  70     cpu->thread = g_malloc0(sizeof(QemuThread));
  71     cpu->halt_cond = g_malloc0(sizeof(QemuCond));
  72     qemu_cond_init(cpu->halt_cond);
  73     snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/KVM",
  74              cpu->cpu_index);
  75     qemu_thread_create(cpu->thread, thread_name, kvm_vcpu_thread_fn,
  76                        cpu, QEMU_THREAD_JOINABLE);
  77 }
  78
  79 static bool kvm_vcpu_thread_is_idle(CPUState *cpu)
  80 {
  81     return !kvm_halt_in_kernel();
  82 }
  83
  84 static bool kvm_cpus_are_resettable(void)
  85 {
  86     return !kvm_enabled() || kvm_cpu_check_are_resettable();
  87 }
  88
  89 static void kvm_accel_ops_class_init(ObjectClass *oc, void *data)
  90 {
  91     AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
  92
  93     ops->create_vcpu_thread = kvm_start_vcpu_thread;
  94     ops->cpu_thread_is_idle = kvm_vcpu_thread_is_idle;
  95     ops->cpus_are_resettable = kvm_cpus_are_resettable;
  96     ops->synchronize_post_reset = kvm_cpu_synchronize_post_reset;
  97     ops->synchronize_post_init = kvm_cpu_synchronize_post_init;
  98     ops->synchronize_state = kvm_cpu_synchronize_state;
  99     ops->synchronize_pre_loadvm = kvm_cpu_synchronize_pre_loadvm;
 100
 101 #ifdef KVM_CAP_SET_GUEST_DEBUG
 102     ops->supports_guest_debug = kvm_supports_guest_debug;
 103     ops->insert_breakpoint = kvm_insert_breakpoint;
 104     ops->remove_breakpoint = kvm_remove_breakpoint;
 105     ops->remove_all_breakpoints = kvm_remove_all_breakpoints;
 106 #endif
 107 }
 108
 109 static const TypeInfo kvm_accel_ops_type = {
 110     .name = ACCEL_OPS_NAME("kvm"),
 111
 112     .parent = TYPE_ACCEL_OPS,
 113     .class_init = kvm_accel_ops_class_init,
 114     .abstract = true,
 115 };
 116
 117 static void kvm_accel_ops_register_types(void)
 118 {
 119     type_register_static(&kvm_accel_ops_type);
 120 }
 121 type_init(kvm_accel_ops_register_types);