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Re: [Qemu-devel] CPU hot unplug support for x86_64


From: Fahri Cihan Demirci
Subject: Re: [Qemu-devel] CPU hot unplug support for x86_64
Date: Tue, 16 Jun 2015 10:09:30 +0300
User-agent: Mutt/1.5.23 (2014-03-12)

On Mon, Jun 15, 2015 at 06:14:23PM +0200, Igor Mammedov wrote:
> On Mon, 15 Jun 2015 15:34:24 +0300
> Fahri Cihan Demirci <address@hidden> wrote:
> 
> > On Mon, Jun 15, 2015 at 11:10:31AM +0200, Igor Mammedov wrote:
> > > On Thu, 11 Jun 2015 10:39:05 +0300
> > > Fahri Cihan Demirci <address@hidden> wrote:
> > > 
> > > > On Tue, Jun 09, 2015 at 05:44:15PM +0200, Eduardo Otubo wrote:
> > > > > Hello all,
> > > > > 
> > > > > I'm a little confused by all the email traffic I've seen on this list
> > > > > lately so I guess asking doesn't hurt: How's the current status
> > > > > regarding CPU hot unplug for x86_64? If there's any task left hanging
> > > > > for testing or debugging -- or even implementing something that is not
> > > > > done yet -- for some reason please let me know how to help. We have a
> > > > > lot of interest on this feature for our projects.
> > > > > 
> > > > > Regards,
> > > > > 
> > > > > -- 
> > > > > Eduardo Otubo
> > > > > ProfitBricks GmbH
> > > > 
> > > > Hello,
> > > > 
> > > > We are (yet another startup) are also interested in this feature and 
> > > > likewise are willing to contribute. As Eduardo mentioned, it is not 
> > > > quite easy to assess the progress or identify the people who require or 
> > > > desire any help. Therefore, any kind of feedback would be most welcome. 
> > > > Thank you.
> > > 
> > > Here is a cpu-remove related series that need reviewing/testing:
> > > http://lists.nongnu.org/archive/html/qemu-devel/2015-06/msg02055.html
> > > 
> > > somewhat related, but unplug could live without it:
> > > http://lists.nongnu.org/archive/html/qemu-devel/2015-06/msg02143.html
> > > 
> > > I general we don't want to add cpu_del monitor command to compliment 
> > > cpu_add one,
> > > and move to device_add, device_del commands instead.
> > > So you could look at making device_add work for x86 CPU and on top of it
> > > add device_del support.
> > 
> > Hello Igor,
> > 
> > That was my impression as well. However, since there is some groundwork for 
> > it and people are sending patches, would you (as a maintainer) be willing 
> > to merge a CPU only hot unplug feature if it reaches an acceptable state?
> I'm not maintainer, but I'll help any way I can to make a progress towards 
> merging.

Even though you are not the CPU maintainer I assumed you'd have better grasp of 
QEMU policy since you seem to be the ICC BUS maintainer. In any case, your 
feedback is much appreciated. Thank you.

> 
> > 
> > Thank you for your input.
> > 
> > > 
> > > > 
> > > > Best regards,
> > > > 
> > > > Fahri Cihan Demirci
> > > > 
> > > 
> 



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