[Qemu-devel] Hot add vcpu not working in Windows server 2012r2

[Qemu-devel] Hot add vcpu not working in Windows server 2012r2

[Wuzongyong (Euler Dept)]

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.

Thanks,
Zongyong Wu

Re: [Qemu-devel] Hot add vcpu not working in Windows server 2012r2

[Igor Mammedov]

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?

> 
> Thanks,
> Zongyong Wu
> 

Re: [Qemu-devel] Hot add vcpu not working in Windows server 2012r2

[Wuzongyong (Euler Dept)]

> 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.

Thanks,
Wu Zongyong

Re: [Qemu-devel] Hot add vcpu not working in Windows server 2012r2

[Igor Mammedov]

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