1 /*
2 * QEMU Windows Hypervisor Platform accelerator (WHPX)
3 *
4 * Copyright Microsoft Corp. 2017
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
11 #include "qemu/osdep.h"
12 #include "system/kvm_int.h"
13 #include "qemu/main-loop.h"
14 #include "system/accel-ops.h"
15 #include "system/cpus.h"
16 #include "qemu/guest-random.h"
17
18 #include "system/whpx.h"
19 #include "whpx-internal.h"
20 #include "whpx-accel-ops.h"
21
whpx_cpu_thread_fn(void * arg)22 static void *whpx_cpu_thread_fn(void *arg)
23 {
24 CPUState *cpu = arg;
25 int r;
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 = whpx_init_vcpu(cpu);
35 if (r < 0) {
36 fprintf(stderr, "whpx_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 = whpx_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 whpx_destroy_vcpu(cpu);
58 cpu_thread_signal_destroyed(cpu);
59 bql_unlock();
60 rcu_unregister_thread();
61 return NULL;
62 }
63
whpx_start_vcpu_thread(CPUState * cpu)64 static void whpx_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/WHPX",
69 cpu->cpu_index);
70 qemu_thread_create(cpu->thread, thread_name, whpx_cpu_thread_fn,
71 cpu, QEMU_THREAD_JOINABLE);
72 }
73
whpx_kick_vcpu_thread(CPUState * cpu)74 static void whpx_kick_vcpu_thread(CPUState *cpu)
75 {
76 if (!qemu_cpu_is_self(cpu)) {
77 whpx_vcpu_kick(cpu);
78 }
79 }
80
whpx_vcpu_thread_is_idle(CPUState * cpu)81 static bool whpx_vcpu_thread_is_idle(CPUState *cpu)
82 {
83 return !whpx_apic_in_platform();
84 }
85
whpx_accel_ops_class_init(ObjectClass * oc,const void * data)86 static void whpx_accel_ops_class_init(ObjectClass *oc, const void *data)
87 {
88 AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
89
90 ops->create_vcpu_thread = whpx_start_vcpu_thread;
91 ops->kick_vcpu_thread = whpx_kick_vcpu_thread;
92 ops->cpu_thread_is_idle = whpx_vcpu_thread_is_idle;
93
94 ops->synchronize_post_reset = whpx_cpu_synchronize_post_reset;
95 ops->synchronize_post_init = whpx_cpu_synchronize_post_init;
96 ops->synchronize_state = whpx_cpu_synchronize_state;
97 ops->synchronize_pre_loadvm = whpx_cpu_synchronize_pre_loadvm;
98 ops->synchronize_pre_resume = whpx_cpu_synchronize_pre_resume;
99 }
100
101 static const TypeInfo whpx_accel_ops_type = {
102 .name = ACCEL_OPS_NAME("whpx"),
103
104 .parent = TYPE_ACCEL_OPS,
105 .class_init = whpx_accel_ops_class_init,
106 .abstract = true,
107 };
108
whpx_accel_ops_register_types(void)109 static void whpx_accel_ops_register_types(void)
110 {
111 type_register_static(&whpx_accel_ops_type);
112 }
113 type_init(whpx_accel_ops_register_types);
114