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 "system/kvm_int.h"
12 #include "qemu/main-loop.h"
13 #include "system/accel-ops.h"
14 #include "system/cpus.h"
15 #include "qemu/guest-random.h"
16
17 #include "system/nvmm.h"
18 #include "nvmm-accel-ops.h"
19
qemu_nvmm_cpu_thread_fn(void * arg)20 static void *qemu_nvmm_cpu_thread_fn(void *arg)
21 {
22 CPUState *cpu = arg;
23 int r;
24
25 assert(nvmm_enabled());
26
27 rcu_register_thread();
28
29 bql_lock();
30 qemu_thread_get_self(cpu->thread);
31 cpu->thread_id = qemu_get_thread_id();
32 current_cpu = cpu;
33
34 r = nvmm_init_vcpu(cpu);
35 if (r < 0) {
36 fprintf(stderr, "nvmm_init_vcpu failed: %s\n", strerror(-r));
37 exit(1);
38 }
39
40 /* signal CPU creation */
41 cpu_thread_signal_created(cpu);
42 qemu_guest_random_seed_thread_part2(cpu->random_seed);
43
44 do {
45 if (cpu_can_run(cpu)) {
46 r = nvmm_vcpu_exec(cpu);
47 if (r == EXCP_DEBUG) {
48 cpu_handle_guest_debug(cpu);
49 }
50 }
51 while (cpu_thread_is_idle(cpu)) {
52 qemu_cond_wait_bql(cpu->halt_cond);
53 }
54 qemu_wait_io_event_common(cpu);
55 } while (!cpu->unplug || cpu_can_run(cpu));
56
57 nvmm_destroy_vcpu(cpu);
58 cpu_thread_signal_destroyed(cpu);
59 bql_unlock();
60 rcu_unregister_thread();
61 return NULL;
62 }
63
nvmm_start_vcpu_thread(CPUState * cpu)64 static void nvmm_start_vcpu_thread(CPUState *cpu)
65 {
66 char thread_name[VCPU_THREAD_NAME_SIZE];
67
68 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/NVMM",
69 cpu->cpu_index);
70 qemu_thread_create(cpu->thread, thread_name, qemu_nvmm_cpu_thread_fn,
71 cpu, QEMU_THREAD_JOINABLE);
72 }
73
74 /*
75 * Abort the call to run the virtual processor by another thread, and to
76 * return the control to that thread.
77 */
nvmm_kick_vcpu_thread(CPUState * cpu)78 static void nvmm_kick_vcpu_thread(CPUState *cpu)
79 {
80 cpu->exit_request = 1;
81 cpus_kick_thread(cpu);
82 }
83
nvmm_accel_ops_class_init(ObjectClass * oc,const void * data)84 static void nvmm_accel_ops_class_init(ObjectClass *oc, const void *data)
85 {
86 AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
87
88 ops->create_vcpu_thread = nvmm_start_vcpu_thread;
89 ops->kick_vcpu_thread = nvmm_kick_vcpu_thread;
90
91 ops->synchronize_post_reset = nvmm_cpu_synchronize_post_reset;
92 ops->synchronize_post_init = nvmm_cpu_synchronize_post_init;
93 ops->synchronize_state = nvmm_cpu_synchronize_state;
94 ops->synchronize_pre_loadvm = nvmm_cpu_synchronize_pre_loadvm;
95 }
96
97 static const TypeInfo nvmm_accel_ops_type = {
98 .name = ACCEL_OPS_NAME("nvmm"),
99
100 .parent = TYPE_ACCEL_OPS,
101 .class_init = nvmm_accel_ops_class_init,
102 .abstract = true,
103 };
104
nvmm_accel_ops_register_types(void)105 static void nvmm_accel_ops_register_types(void)
106 {
107 type_register_static(&nvmm_accel_ops_type);
108 }
109 type_init(nvmm_accel_ops_register_types);
110