Re: [Qemu-devel] [PATCH] spapr: support CPU hotplug

[Paolo Bonzini]

Il 27/08/2013 08:37, Alexey Kardashevskiy ha scritto:
>>> So this is here to make sure we don't accidentally get out of halted state 
>>> by an interrupt on that vcpu. Could you please somehow make that part 
>>> obvious? Either by adding a comment or by only explicitly masking DEC and 
>>> EE and a comment :).
>>>
>>>> +    cs->exit_request = 1;
>>>
>>> This should probably be qemu_cpu_kick_self().
>>
>> Uh, no, I don't think so.  This is there purely to make sure we exit
>> the inner loop, and actually test cpu_can_run() which will test
>> halted.  AFAICT qemu_cpu_kick_self() won't do anything similar.
> 
> rtas_stop_self() eventually returns to kvm_cpu_exec() which calls
> qemu_cpu_kick_self() and resets cs->exit_request before return so I do not
> really see the difference in behaviour. And actually both ways CPU stops in
> exactly the same way. What do I miss?

What about TCG?

Paolo