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Claudio Fontana1583a382020-07-07 10:21:10 +02001/*
Jason Andryuk9ce84a02020-10-13 10:05:10 -04002 * Dummy cpu thread code
Claudio Fontana1583a382020-07-07 10:21:10 +02003 *
4 * Copyright IBM, Corp. 2011
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
11 *
12 */
13
14#include "qemu/osdep.h"
15#include "qemu/rcu.h"
Claudio Fontana1583a382020-07-07 10:21:10 +020016#include "sysemu/cpus.h"
Claudio Fontana1583a382020-07-07 10:21:10 +020017#include "qemu/guest-random.h"
18#include "qemu/main-loop.h"
19#include "hw/core/cpu.h"
20
Jason Andryuk9ce84a02020-10-13 10:05:10 -040021static void *dummy_cpu_thread_fn(void *arg)
Claudio Fontana1583a382020-07-07 10:21:10 +020022{
Claudio Fontana1583a382020-07-07 10:21:10 +020023 CPUState *cpu = arg;
Claudio Fontana1583a382020-07-07 10:21:10 +020024
25 rcu_register_thread();
26
Stefan Hajnoczi195801d2024-01-02 10:35:25 -050027 bql_lock();
Claudio Fontana1583a382020-07-07 10:21:10 +020028 qemu_thread_get_self(cpu->thread);
29 cpu->thread_id = qemu_get_thread_id();
Claudio Fontana1583a382020-07-07 10:21:10 +020030 current_cpu = cpu;
31
Xuzhou Chengc9923552022-10-28 12:57:26 +080032#ifndef _WIN32
33 sigset_t waitset;
34 int r;
35
Claudio Fontana1583a382020-07-07 10:21:10 +020036 sigemptyset(&waitset);
37 sigaddset(&waitset, SIG_IPI);
Xuzhou Chengc9923552022-10-28 12:57:26 +080038#endif
Claudio Fontana1583a382020-07-07 10:21:10 +020039
40 /* signal CPU creation */
41 cpu_thread_signal_created(cpu);
42 qemu_guest_random_seed_thread_part2(cpu->random_seed);
43
44 do {
Stefan Hajnoczi195801d2024-01-02 10:35:25 -050045 bql_unlock();
Xuzhou Chengc9923552022-10-28 12:57:26 +080046#ifndef _WIN32
Claudio Fontana1583a382020-07-07 10:21:10 +020047 do {
48 int sig;
49 r = sigwait(&waitset, &sig);
50 } while (r == -1 && (errno == EAGAIN || errno == EINTR));
51 if (r == -1) {
52 perror("sigwait");
53 exit(1);
54 }
Xuzhou Chengc9923552022-10-28 12:57:26 +080055#else
56 qemu_sem_wait(&cpu->sem);
57#endif
Stefan Hajnoczi195801d2024-01-02 10:35:25 -050058 bql_lock();
Claudio Fontana1583a382020-07-07 10:21:10 +020059 qemu_wait_io_event(cpu);
60 } while (!cpu->unplug);
61
Stefan Hajnoczi195801d2024-01-02 10:35:25 -050062 bql_unlock();
Claudio Fontana1583a382020-07-07 10:21:10 +020063 rcu_unregister_thread();
64 return NULL;
Claudio Fontana1583a382020-07-07 10:21:10 +020065}
66
Jason Andryuk9ce84a02020-10-13 10:05:10 -040067void dummy_start_vcpu_thread(CPUState *cpu)
Claudio Fontana1583a382020-07-07 10:21:10 +020068{
69 char thread_name[VCPU_THREAD_NAME_SIZE];
70
Claudio Fontana1583a382020-07-07 10:21:10 +020071 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY",
72 cpu->cpu_index);
Jason Andryuk9ce84a02020-10-13 10:05:10 -040073 qemu_thread_create(cpu->thread, thread_name, dummy_cpu_thread_fn, cpu,
Claudio Fontana1583a382020-07-07 10:21:10 +020074 QEMU_THREAD_JOINABLE);
Xuzhou Chengc9923552022-10-28 12:57:26 +080075#ifdef _WIN32
76 qemu_sem_init(&cpu->sem, 0);
77#endif
Claudio Fontana1583a382020-07-07 10:21:10 +020078}