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Date: Mon, 16 Apr 2018 10:35:57 +0200
From: Igor Mammedov <imammedo@redhat.com>
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Subject: Re: [Qemu-devel] Hot add vcpu not working in Windows server 2012r2
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To: "Wuzongyong (Euler Dept)" <cordius.wu@huawei.com>
Cc: "Wanzongshun (Vincent)" <wanzongshun@huawei.com>, huangfeiqing <huangfeiqing@huawei.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

On Mon, 16 Apr 2018 07:28:47 +0000
"Wuzongyong (Euler Dept)" <cordius.wu@huawei.com> wrote:

> > On Fri, 13 Apr 2018 03:14:44 +0000
> > "Wuzongyong (Euler Dept)" <cordius.wu@huawei.com> wrote:
> >   
> > > Hi,
> > >
> > > I try to hot add vcpus to a windows server 2012r2 virtual machine on  
> > RHEL 7.4 platform.  
> > > But Task Manager didn't show extra processors I hot added though they
> > > appeared in Device Manager. Actually, I need to require reboot the vm
> > > to make processors hot Added appear in Task Manager.
> > > Is there some problem with redhat qemu? Why the processors I hot-added
> > > didn't online automatically?
> > > I don't know if I ask the right person or in a right mail list,  
> > apologize first if I bother you.
> > It might depend on particular edition of windows server you are running.
> > I usually test it with 'data server' edition where it supposed to work.
> > Could you check if that works?  
> Win2012 datacenter build 9200 don't help.
> I try to install a high version qemu from a centos repo, and it can hot-add
> vcpus normally. I guess the release of qemu in rhel 7.5 is too low.
Basic RHEL version is pretty old, you should use qemu-kvm-rhev instead.

> 
> Thanks,
> Wu Zongyong