qemu/accel/dummy-cpus.c
Philippe Mathieu-Daudé 396f66f99d accel: Do not set CPUState::can_do_io in non-TCG accels
'can_do_io' is specific to TCG. It was added to other
accelerators in 626cf8f4c6 ("icount: set can_do_io outside
TB execution"), then likely copy/pasted in commit c97d6d2cdf
("i386: hvf: add code base from Google's QEMU repository").
Having it set in non-TCG code is confusing, so remove it from
QTest / HVF / KVM.

Fixes: 626cf8f4c6 ("icount: set can_do_io outside TB execution")
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231129205037.16849-1-philmd@linaro.org>
2024-01-19 12:28:59 +01:00

82 lines
1.8 KiB
C

/*
* Dummy cpu thread code
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qemu/rcu.h"
#include "sysemu/cpus.h"
#include "qemu/guest-random.h"
#include "qemu/main-loop.h"
#include "hw/core/cpu.h"
static void *dummy_cpu_thread_fn(void *arg)
{
CPUState *cpu = arg;
rcu_register_thread();
bql_lock();
qemu_thread_get_self(cpu->thread);
cpu->thread_id = qemu_get_thread_id();
current_cpu = cpu;
#ifndef _WIN32
sigset_t waitset;
int r;
sigemptyset(&waitset);
sigaddset(&waitset, SIG_IPI);
#endif
/* signal CPU creation */
cpu_thread_signal_created(cpu);
qemu_guest_random_seed_thread_part2(cpu->random_seed);
do {
bql_unlock();
#ifndef _WIN32
do {
int sig;
r = sigwait(&waitset, &sig);
} while (r == -1 && (errno == EAGAIN || errno == EINTR));
if (r == -1) {
perror("sigwait");
exit(1);
}
#else
qemu_sem_wait(&cpu->sem);
#endif
bql_lock();
qemu_wait_io_event(cpu);
} while (!cpu->unplug);
bql_unlock();
rcu_unregister_thread();
return NULL;
}
void dummy_start_vcpu_thread(CPUState *cpu)
{
char thread_name[VCPU_THREAD_NAME_SIZE];
cpu->thread = g_malloc0(sizeof(QemuThread));
cpu->halt_cond = g_malloc0(sizeof(QemuCond));
qemu_cond_init(cpu->halt_cond);
snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY",
cpu->cpu_index);
qemu_thread_create(cpu->thread, thread_name, dummy_cpu_thread_fn, cpu,
QEMU_THREAD_JOINABLE);
#ifdef _WIN32
qemu_sem_init(&cpu->sem, 0);
#endif
}