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); 113