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
kvm_vcpu_thread_fn(void * arg)29 static void *kvm_vcpu_thread_fn(void *arg)
30 {
31 CPUState *cpu = arg;
32 int r;
33
34 rcu_register_thread();
35
36 bql_lock();
37 qemu_thread_get_self(cpu->thread);
38 cpu->thread_id = qemu_get_thread_id();
39 current_cpu = cpu;
40
41 r = kvm_init_vcpu(cpu, &error_fatal);
42 kvm_init_cpu_signals(cpu);
43
44 /* signal CPU creation */
45 cpu_thread_signal_created(cpu);
46 qemu_guest_random_seed_thread_part2(cpu->random_seed);
47
48 do {
49 if (cpu_can_run(cpu)) {
50 r = kvm_cpu_exec(cpu);
51 if (r == EXCP_DEBUG) {
52 cpu_handle_guest_debug(cpu);
53 }
54 }
55 qemu_wait_io_event(cpu);
56 } while (!cpu->unplug || cpu_can_run(cpu));
57
58 kvm_destroy_vcpu(cpu);
59 cpu_thread_signal_destroyed(cpu);
60 bql_unlock();
61 rcu_unregister_thread();
62 return NULL;
63 }
64
kvm_start_vcpu_thread(CPUState * cpu)65 static void kvm_start_vcpu_thread(CPUState *cpu)
66 {
67 char thread_name[VCPU_THREAD_NAME_SIZE];
68
69 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/KVM",
70 cpu->cpu_index);
71 qemu_thread_create(cpu->thread, thread_name, kvm_vcpu_thread_fn,
72 cpu, QEMU_THREAD_JOINABLE);
73 }
74
kvm_vcpu_thread_is_idle(CPUState * cpu)75 static bool kvm_vcpu_thread_is_idle(CPUState *cpu)
76 {
77 return !kvm_halt_in_kernel();
78 }
79
kvm_cpus_are_resettable(void)80 static bool kvm_cpus_are_resettable(void)
81 {
82 return !kvm_enabled() || !kvm_state->guest_state_protected;
83 }
84
85 #ifdef TARGET_KVM_HAVE_GUEST_DEBUG
kvm_update_guest_debug_ops(CPUState * cpu)86 static int kvm_update_guest_debug_ops(CPUState *cpu)
87 {
88 return kvm_update_guest_debug(cpu, 0);
89 }
90 #endif
91
kvm_accel_ops_class_init(ObjectClass * oc,void * data)92 static void kvm_accel_ops_class_init(ObjectClass *oc, void *data)
93 {
94 AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
95
96 ops->create_vcpu_thread = kvm_start_vcpu_thread;
97 ops->cpu_thread_is_idle = kvm_vcpu_thread_is_idle;
98 ops->cpus_are_resettable = kvm_cpus_are_resettable;
99 ops->synchronize_post_reset = kvm_cpu_synchronize_post_reset;
100 ops->synchronize_post_init = kvm_cpu_synchronize_post_init;
101 ops->synchronize_state = kvm_cpu_synchronize_state;
102 ops->synchronize_pre_loadvm = kvm_cpu_synchronize_pre_loadvm;
103
104 #ifdef TARGET_KVM_HAVE_GUEST_DEBUG
105 ops->update_guest_debug = kvm_update_guest_debug_ops;
106 ops->supports_guest_debug = kvm_supports_guest_debug;
107 ops->insert_breakpoint = kvm_insert_breakpoint;
108 ops->remove_breakpoint = kvm_remove_breakpoint;
109 ops->remove_all_breakpoints = kvm_remove_all_breakpoints;
110 #endif
111 }
112
113 static const TypeInfo kvm_accel_ops_type = {
114 .name = ACCEL_OPS_NAME("kvm"),
115
116 .parent = TYPE_ACCEL_OPS,
117 .class_init = kvm_accel_ops_class_init,
118 .abstract = true,
119 };
120
kvm_accel_ops_register_types(void)121 static void kvm_accel_ops_register_types(void)
122 {
123 type_register_static(&kvm_accel_ops_type);
124 }
125 type_init(kvm_accel_ops_register_types);
126