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cpus-common: move CPU list management to common code

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Add a mutex for the CPU list to system emulation, as it will be used to
manage safe work.  Abstract manipulation of the CPU list in new functions
cpu_list_add and cpu_list_remove.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-08-28 03:45:14 +02:00
parent 178f94297a
commit 267f685b8b
9 changed files with 109 additions and 68 deletions
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37
exec.c
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@ -598,36 +598,11 @@ AddressSpace *cpu_get_address_space(CPUState *cpu, int asidx)
}
#endif
static bool cpu_index_auto_assigned;
static int cpu_get_free_index(void)
{
CPUState *some_cpu;
int cpu_index = 0;
cpu_index_auto_assigned = true;
CPU_FOREACH(some_cpu) {
cpu_index++;
}
return cpu_index;
}
void cpu_exec_exit(CPUState *cpu)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
cpu_list_lock();
if (!QTAILQ_IN_USE(cpu, node)) {
/* there is nothing to undo since cpu_exec_init() hasn't been called */
cpu_list_unlock();
return;
}
assert(!(cpu_index_auto_assigned && cpu != QTAILQ_LAST(&cpus, CPUTailQ)));
QTAILQ_REMOVE(&cpus, cpu, node);
cpu->cpu_index = UNASSIGNED_CPU_INDEX;
cpu_list_unlock();
cpu_list_remove(cpu);
if (cc->vmsd != NULL) {
vmstate_unregister(NULL, cc->vmsd, cpu);
@ -663,15 +638,7 @@ void cpu_exec_init(CPUState *cpu, Error **errp)
object_ref(OBJECT(cpu->memory));
#endif
cpu_list_lock();
if (cpu->cpu_index == UNASSIGNED_CPU_INDEX) {
cpu->cpu_index = cpu_get_free_index();
assert(cpu->cpu_index != UNASSIGNED_CPU_INDEX);
} else {
assert(!cpu_index_auto_assigned);
}
QTAILQ_INSERT_TAIL(&cpus, cpu, node);
cpu_list_unlock();
cpu_list_add(cpu);
#ifndef CONFIG_USER_ONLY
if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {