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Re: [Qemu-devel] [PATCH v4 00/10] cpu: add device_add foo-x86_64-cpu sup

From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCH v4 00/10] cpu: add device_add foo-x86_64-cpu support
Date: Thu, 26 Feb 2015 10:35:28 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0


Am 25.02.2015 um 10:58 schrieb Chen Fan:
> On 02/25/2015 12:56 AM, Andreas Färber wrote:
>> Am 24.02.2015 um 02:25 schrieb Gu Zheng:
>>> The issues you commented in the previous version have been fixed in
>>> this one.
>> What I have repeatedly rejected is "device_add foo-x86_64-cpu". This is
>> still in 00/10 and 09/10. Most of the actual changes however do look to
>> be going in the right direction of making 'realize' work as expected for
>> foo-x86_64-cpu.
>> As for the socket-based device_add I mentioned, I had pushed a work
>> branch qom-cpu-x86 and had some off-list discussions for some of the
>> other architectures but did not submit it as an RFC yet. What I am still
>> working on is dynamic properties to allocate cores (threads TBD) for
>> "device_add x86_64-cpu-socket,cores=n".
> Can you explain all your thoughts about cpu hotplug feature with
> socket-based,
> or how goals do you want to see?

Basically I am implementing Anthony's suggestion from a year or two
back, that is moving towards using real building blocks such as
Xeon-E5-4242 as shortcut for a 6-core, 2-HT device, ultimately replacing
-cpu. Think of what can be plugged in real servers - a socket is atomic
in reality, you can't add cores or hyperthreads dynamically. And the QOM
realize model then forces me to use child<> properties inside the socket
object for consistent recursive processing.


> and what is the status of "device_add x86_64-cpu-socket" ?
> after that, I think we can do somethings to help you to achieve your ideas.
> Thanks,
> Chen
>>> Could you please help to review it?
>> Will get to it Friday earliest.
>> Regards,
>> Andreas

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