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exec: Ensure the only one cpu_index allocation method is used 

Make sure that cpu_index auto allocation isn't used in
combination with manual cpu_index assignment. And
dissallow out of order cpu removal if auto allocation
is in use.

Target that wishes to support out of order unplug should
switch to manual cpu_index assignment. Following patch
could be used as an example:
 (pc: init CPUState->cpu_index with index in possible_cpus[]))

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Igor Mammedov 2016-07-27 11:24:54 +02:00 committed by Eduardo Habkost
parent e87d397e5e
commit 630eb0faf4
1 changed files with 7 additions and 0 deletions
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7
exec.c
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@ -598,11 +598,14 @@ 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++;
}
@ -620,6 +623,8 @@ void cpu_exec_exit(CPUState *cpu)
return;
}
assert(!(cpu_index_auto_assigned && cpu != QTAILQ_LAST(&cpus, CPUTailQ)));
QTAILQ_REMOVE(&cpus, cpu, node);
cpu->node.tqe_prev = NULL;
cpu->cpu_index = UNASSIGNED_CPU_INDEX;
@ -663,6 +668,8 @@ void cpu_exec_init(CPUState *cpu, Error **errp)
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();