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Re: [Qemu-devel] [PATCH v3 0/7] cpu: add i386 cpu hot remove support

From: Dou Liyang
Subject: Re: [Qemu-devel] [PATCH v3 0/7] cpu: add i386 cpu hot remove support
Date: Thu, 23 Jun 2016 16:54:20 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0


Thanks to test.

在 2016年06月22日 20:12, Eduardo Otubo 写道:
On Mon, Jul 13, 2015 at 09=45=57AM +0800, Zhu Guihua wrote:
On 07/09/2015 10:25 PM, Eduardo Otubo wrote:
On Fri, Jun 26, 2015 at 11=37=43AM +0800, Zhu Guihua wrote:
On 06/24/2015 09:28 PM, Eduardo Otubo wrote:
Hello Zhu,

Are you still working on this feature? Could you provide a rebased
version of this series?
Sorry for late reply.

Yes, we are still working on this feature.

I have updated my github, you can get the rebased version from it.

https://github.com/zhuguihua/qemu.git  cpu-hotplug
Hi, thanks a lot for rebasing it. I didn't have time to test it, though.
I appologise.

Regarding your branch, your plan is to stick with device_del and
object_del interface?
Yeah, we will only stick with device_del interface.
There is no need to use object_del interface for cpu hot remove.


This is almost a year old email, but I decided to git it a try anyway.
Are you still working on this?
Yes, we are still working on this feature.

but, as we discuss almost one year age and the Abstract CPU core type is defined recently, this patch's QMP/HMP interface will be replace.

we are  following Igor's patches to see what we can do for this feature.
I'm trying your patches and it seems I
had a simple issue: EJ0 is sent, guest ack's and removes the CPU, but it
get's stuck somewhere between the BIOS and Qemu. CPU is successfully
removed from the guest, but it still appears on QOM:

     (qemu) info cpus
     * CPU #0: pc=0xffffffff8104f596 (halted) thread_id=22208
       CPU #1: pc=0xffffffff8104f596 (halted) thread_id=22209
       CPU #2: pc=0xffffffff810429c8 (halted) thread_id=22281
     (qemu) info qom-tree
     /machine (pc-i440fx-2.1-machine)
       /fw_cfg (fw_cfg_io)
         /fwcfg[0] (qemu:memory-region)
[...] /cpu3 (SandyBridge-x86_64-cpu) [...]

Do you have any clues?
we guess Qom may not be updated during the remove event. we will concern it.


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