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 "sysemu/kvm_int.h"
13 #include "qemu/main-loop.h"
14 #include "sysemu/cpus.h"
15 #include "qemu/guest-random.h"
16
17 #include "sysemu/whpx.h"
18 #include "whpx-internal.h"
19 #include "whpx-accel-ops.h"
20
whpx_cpu_thread_fn(void * arg)21 static void *whpx_cpu_thread_fn(void *arg)
22 {
23 CPUState *cpu = arg;
24 int r;
25
26 rcu_register_thread();
27
28 bql_lock();
29 qemu_thread_get_self(cpu->thread);
30 cpu->thread_id = qemu_get_thread_id();
31 current_cpu = cpu;
32
33 r = whpx_init_vcpu(cpu);
34 if (r < 0) {
35 fprintf(stderr, "whpx_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 = whpx_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_bql(cpu->halt_cond);
52 }
53 qemu_wait_io_event_common(cpu);
54 } while (!cpu->unplug || cpu_can_run(cpu));
55
56 whpx_destroy_vcpu(cpu);
57 cpu_thread_signal_destroyed(cpu);
58 bql_unlock();
59 rcu_unregister_thread();
60 return NULL;
61 }
62
whpx_start_vcpu_thread(CPUState * cpu)63 static void whpx_start_vcpu_thread(CPUState *cpu)
64 {
65 char thread_name[VCPU_THREAD_NAME_SIZE];
66
67 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/WHPX",
68 cpu->cpu_index);
69 qemu_thread_create(cpu->thread, thread_name, whpx_cpu_thread_fn,
70 cpu, QEMU_THREAD_JOINABLE);
71 }
72
whpx_kick_vcpu_thread(CPUState * cpu)73 static void whpx_kick_vcpu_thread(CPUState *cpu)
74 {
75 if (!qemu_cpu_is_self(cpu)) {
76 whpx_vcpu_kick(cpu);
77 }
78 }
79
whpx_vcpu_thread_is_idle(CPUState * cpu)80 static bool whpx_vcpu_thread_is_idle(CPUState *cpu)
81 {
82 return !whpx_apic_in_platform();
83 }
84
whpx_accel_ops_class_init(ObjectClass * oc,void * data)85 static void whpx_accel_ops_class_init(ObjectClass *oc, void *data)
86 {
87 AccelOpsClass *ops = ACCEL_OPS_CLASS(oc);
88
89 ops->create_vcpu_thread = whpx_start_vcpu_thread;
90 ops->kick_vcpu_thread = whpx_kick_vcpu_thread;
91 ops->cpu_thread_is_idle = whpx_vcpu_thread_is_idle;
92
93 ops->synchronize_post_reset = whpx_cpu_synchronize_post_reset;
94 ops->synchronize_post_init = whpx_cpu_synchronize_post_init;
95 ops->synchronize_state = whpx_cpu_synchronize_state;
96 ops->synchronize_pre_loadvm = whpx_cpu_synchronize_pre_loadvm;
97 ops->synchronize_pre_resume = whpx_cpu_synchronize_pre_resume;
98 }
99
100 static const TypeInfo whpx_accel_ops_type = {
101 .name = ACCEL_OPS_NAME("whpx"),
102
103 .parent = TYPE_ACCEL_OPS,
104 .class_init = whpx_accel_ops_class_init,
105 .abstract = true,
106 };
107
whpx_accel_ops_register_types(void)108 static void whpx_accel_ops_register_types(void)
109 {
110 type_register_static(&whpx_accel_ops_type);
111 }
112 type_init(whpx_accel_ops_register_types);
113