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exec: Remove cpu from cpus list during cpu_exec_exit() 

CPUState *cpu gets added to the cpus list during cpu_exec_init(). It
should be removed from cpu_exec_exit().

cpu_exec_exit() is called from generic CPU::instance_finalize and some
archs like PowerPC call it from CPU unrealizefn. So ensure that we
dequeue the cpu only once.

Now -1 value for cpu->cpu_index indicates that we have already dequeued
the cpu for CONFIG_USER_ONLY case also.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Bharata B Rao 2016-05-12 09:18:11 +05:30 committed by David Gibson
parent 4e0806110c
commit 1c59eb39cf
1 changed files with 24 additions and 8 deletions
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32
exec.c
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@ -612,15 +612,9 @@ static int cpu_get_free_index(Error **errp)
return cpu;
}
void cpu_exec_exit(CPUState *cpu)
static void cpu_release_index(CPUState *cpu)
{
if (cpu->cpu_index == -1) {
/* cpu_index was never allocated by this @cpu or was already freed. */
return;
}
bitmap_clear(cpu_index_map, cpu->cpu_index, 1);
cpu->cpu_index = -1;
}
#else
@ -635,11 +629,33 @@ static int cpu_get_free_index(Error **errp)
return cpu_index;
}
void cpu_exec_exit(CPUState *cpu)
static void cpu_release_index(CPUState *cpu)
{
return;
}
#endif
void cpu_exec_exit(CPUState *cpu)
{
#if defined(CONFIG_USER_ONLY)
cpu_list_lock();
#endif
if (cpu->cpu_index == -1) {
/* cpu_index was never allocated by this @cpu or was already freed. */
#if defined(CONFIG_USER_ONLY)
cpu_list_unlock();
#endif
return;
}
QTAILQ_REMOVE(&cpus, cpu, node);
cpu_release_index(cpu);
cpu->cpu_index = -1;
#if defined(CONFIG_USER_ONLY)
cpu_list_unlock();
#endif
}
void cpu_exec_init(CPUState *cpu, Error **errp)
{
CPUClass *cc = CPU_GET_CLASS(cpu);