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

[Fahri Cihan Demirci]

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?

Thank you for your input.

> 
> > 
> > Best regards,
> > 
> > Fahri Cihan Demirci
> > 
>