Re: [Qemu-devel] [PATCH 7/8] [PATCH RFC v3] s390-qemu: cpu hotplug - Implement hot_add_cpu hook

["Andreas Färber" <afaerber@suse.de>]

Am 13.09.2013 17:29, schrieb Jason J. Herne:
> On 09/05/2013 08:38 AM, Andreas Färber wrote:
>> Am 01.08.2013 16:12, schrieb Jason J. Herne:
>>> From: "Jason J. Herne" <jjherne@us.ibm.com>
>>>
>>> Implement hot_add_cpu for S390 to allow hot plugging of cpus.
>>>
>>> Signed-off-by: Jason J. Herne <jjherne@us.ibm.com>
>>> ---
>>>   hw/s390x/s390-virtio-ccw.c |    3 +++
>>>   target-s390x/cpu.c         |   32 ++++++++++++++++++++++++++++++++
>>>   target-s390x/cpu.h         |    2 ++
>>>   3 files changed, 37 insertions(+)
>>>
>>> diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
>>> index b469960..30b6a48 100644
>>> --- a/hw/s390x/s390-virtio-ccw.c
>>> +++ b/hw/s390x/s390-virtio-ccw.c
>>> @@ -117,6 +117,9 @@ static QEMUMachine ccw_machine = {
>>>       .alias = "s390-ccw",
>>>       .desc = "VirtIO-ccw based S390 machine",
>>>       .init = ccw_init,
>>> +#if !defined(CONFIG_USER_ONLY)
>>> +    .hot_add_cpu = ccw_hot_add_cpu,
>>> +#endif
>>
>> I doubt this #ifdeffery is necessary here?
>>
> 
> This was needed because ccw_hot_add_cpu calls s390_cpu_addr2state which
> is wrapped in the very same ifdef.

This whole file should never get compiled for CONFIG_USER_ONLY.

>  However, the offending line is this:
> 
> model_str = s390_cpu_addr2state(0)->env.cpu_model_str;
> 
> Since we're doing away with that line anyway I can probably remove that
> ifdef. However, does it make sense to have a cpu-add command for the
> linux-user target?
> 
> Also, do you know when your patch to remove the model string will hit
> the master branch?

I've pushed it to qom-cpu-next branch for now, suggest to rebase on
that. It all depends on when I get to review all the pending patches and
respin some interfering ones and then get someone to pull, which is
outside of my control.

Cheers,
Andreas

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