LXR qemu/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
  29static 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
  66static 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
  79static bool kvm_vcpu_thread_is_idle(CPUState *cpu)
  80{
  81    return !kvm_halt_in_kernel();
  82}
  83
  84static bool kvm_cpus_are_resettable(void)
  85{
  86    return !kvm_enabled() || kvm_cpu_check_are_resettable();
  87}
  88
  89#ifdef KVM_CAP_SET_GUEST_DEBUG
  90static int kvm_update_guest_debug_ops(CPUState *cpu)
  91{
  92    return kvm_update_guest_debug(cpu, 0);
  93}
  94#endif
  95
  96static void kvm_accel_ops_class_init(ObjectClass *oc, void *data)
  97{
  98    AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
  99
 100    ops->create_vcpu_thread = kvm_start_vcpu_thread;
 101    ops->cpu_thread_is_idle = kvm_vcpu_thread_is_idle;
 102    ops->cpus_are_resettable = kvm_cpus_are_resettable;
 103    ops->synchronize_post_reset = kvm_cpu_synchronize_post_reset;
 104    ops->synchronize_post_init = kvm_cpu_synchronize_post_init;
 105    ops->synchronize_state = kvm_cpu_synchronize_state;
 106    ops->synchronize_pre_loadvm = kvm_cpu_synchronize_pre_loadvm;
 107
 108#ifdef KVM_CAP_SET_GUEST_DEBUG
 109    ops->update_guest_debug = kvm_update_guest_debug_ops;
 110    ops->supports_guest_debug = kvm_supports_guest_debug;
 111    ops->insert_breakpoint = kvm_insert_breakpoint;
 112    ops->remove_breakpoint = kvm_remove_breakpoint;
 113    ops->remove_all_breakpoints = kvm_remove_all_breakpoints;
 114#endif
 115}
 116
 117static const TypeInfo kvm_accel_ops_type = {
 118    .name = ACCEL_OPS_NAME("kvm"),
 119
 120    .parent = TYPE_ACCEL_OPS,
 121    .class_init = kvm_accel_ops_class_init,
 122    .abstract = true,
 123};
 124
 125static void kvm_accel_ops_register_types(void)
 126{
 127    type_register_static(&kvm_accel_ops_type);
 128}
 129type_init(kvm_accel_ops_register_types);
 130