Merge remote-tracking branch 'remotes/mcayland/tags/qemu-openbios-20220115' into...
[qemu.git] / target / i386 / nvmm / nvmm-accel-ops.c
1 /*
2 * Copyright (c) 2018-2019 Maxime Villard, All rights reserved.
3 *
4 * NetBSD Virtual Machine Monitor (NVMM) accelerator for QEMU.
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
8 */
9
10 #include "qemu/osdep.h"
11 #include "sysemu/kvm_int.h"
12 #include "qemu/main-loop.h"
13 #include "sysemu/cpus.h"
14 #include "qemu/guest-random.h"
15
16 #include "sysemu/nvmm.h"
17 #include "nvmm-accel-ops.h"
18
19 static void *qemu_nvmm_cpu_thread_fn(void *arg)
20 {
21 CPUState *cpu = arg;
22 int r;
23
24 assert(nvmm_enabled());
25
26 rcu_register_thread();
27
28 qemu_mutex_lock_iothread();
29 qemu_thread_get_self(cpu->thread);
30 cpu->thread_id = qemu_get_thread_id();
31 current_cpu = cpu;
32
33 r = nvmm_init_vcpu(cpu);
34 if (r < 0) {
35 fprintf(stderr, "nvmm_init_vcpu failed: %s\n", strerror(-r));
36 exit(1);
37 }
38
39 /* signal CPU creation */
40 cpu_thread_signal_created(cpu);
41 qemu_guest_random_seed_thread_part2(cpu->random_seed);
42
43 do {
44 if (cpu_can_run(cpu)) {
45 r = nvmm_vcpu_exec(cpu);
46 if (r == EXCP_DEBUG) {
47 cpu_handle_guest_debug(cpu);
48 }
49 }
50 while (cpu_thread_is_idle(cpu)) {
51 qemu_cond_wait_iothread(cpu->halt_cond);
52 }
53 qemu_wait_io_event_common(cpu);
54 } while (!cpu->unplug || cpu_can_run(cpu));
55
56 nvmm_destroy_vcpu(cpu);
57 cpu_thread_signal_destroyed(cpu);
58 qemu_mutex_unlock_iothread();
59 rcu_unregister_thread();
60 return NULL;
61 }
62
63 static void nvmm_start_vcpu_thread(CPUState *cpu)
64 {
65 char thread_name[VCPU_THREAD_NAME_SIZE];
66
67 cpu->thread = g_malloc0(sizeof(QemuThread));
68 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
69 qemu_cond_init(cpu->halt_cond);
70 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/NVMM",
71 cpu->cpu_index);
72 qemu_thread_create(cpu->thread, thread_name, qemu_nvmm_cpu_thread_fn,
73 cpu, QEMU_THREAD_JOINABLE);
74 }
75
76 /*
77 * Abort the call to run the virtual processor by another thread, and to
78 * return the control to that thread.
79 */
80 static void nvmm_kick_vcpu_thread(CPUState *cpu)
81 {
82 cpu->exit_request = 1;
83 cpus_kick_thread(cpu);
84 }
85
86 static void nvmm_accel_ops_class_init(ObjectClass *oc, void *data)
87 {
88 AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
89
90 ops->create_vcpu_thread = nvmm_start_vcpu_thread;
91 ops->kick_vcpu_thread = nvmm_kick_vcpu_thread;
92
93 ops->synchronize_post_reset = nvmm_cpu_synchronize_post_reset;
94 ops->synchronize_post_init = nvmm_cpu_synchronize_post_init;
95 ops->synchronize_state = nvmm_cpu_synchronize_state;
96 ops->synchronize_pre_loadvm = nvmm_cpu_synchronize_pre_loadvm;
97 }
98
99 static const TypeInfo nvmm_accel_ops_type = {
100 .name = ACCEL_OPS_NAME("nvmm"),
101
102 .parent = TYPE_ACCEL_OPS,
103 .class_init = nvmm_accel_ops_class_init,
104 .abstract = true,
105 };
106
107 static void nvmm_accel_ops_register_types(void)
108 {
109 type_register_static(&nvmm_accel_ops_type);
110 }
111 type_init(nvmm_accel_ops_register_types);