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system/cpus: Add cpu_pause() function 

This factors the CPU pause function from pause_all_vcpus() into a
new cpu_pause() function, similarly to cpu_resume(). cpu_resume()
is moved to keep it next to cpu_pause().

Cc: Philippe Mathieu-Daudé <philmd@linaro.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-ID: <20240712120247.477133-17-npiggin@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Nicholas Piggin 2024-07-12 22:02:43 +10:00 committed by Philippe Mathieu-Daudé
parent de680286b5
commit 6b6593107d
2 changed files with 25 additions and 13 deletions
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8
include/hw/core/cpu.h
View File

@ -984,6 +984,14 @@ void cpu_reset_interrupt(CPUState *cpu, int mask);
*/
void cpu_exit(CPUState *cpu);
/**
* cpu_pause:
* @cpu: The CPU to pause.
*
* Pauses CPU, i.e. puts CPU into stopped state.
*/
void cpu_pause(CPUState *cpu);
/**
* cpu_resume:
* @cpu: The CPU to resume.

30
system/cpus.c
View File

@ -568,6 +568,22 @@ void cpu_thread_signal_destroyed(CPUState *cpu)
qemu_cond_signal(&qemu_cpu_cond);
}
void cpu_pause(CPUState *cpu)
{
if (qemu_cpu_is_self(cpu)) {
qemu_cpu_stop(cpu, true);
} else {
cpu->stop = true;
qemu_cpu_kick(cpu);
}
}
void cpu_resume(CPUState *cpu)
{
cpu->stop = false;
cpu->stopped = false;
qemu_cpu_kick(cpu);
}
static bool all_vcpus_paused(void)
{
@ -588,12 +604,7 @@ void pause_all_vcpus(void)
qemu_clock_enable(QEMU_CLOCK_VIRTUAL, false);
CPU_FOREACH(cpu) {
if (qemu_cpu_is_self(cpu)) {
qemu_cpu_stop(cpu, true);
} else {
cpu->stop = true;
qemu_cpu_kick(cpu);
}
cpu_pause(cpu);
}
/* We need to drop the replay_lock so any vCPU threads woken up
@ -613,13 +624,6 @@ void pause_all_vcpus(void)
bql_lock();
}
void cpu_resume(CPUState *cpu)
{
cpu->stop = false;
cpu->stopped = false;
qemu_cpu_kick(cpu);
}
void resume_all_vcpus(void)
{
CPUState *cpu;