Re: [libvirt] [PATCH RESEND RFC v4 1/6] Introduce the function virCgroupForVcpu

[Eric Blake <eblake redhat com>]

On 07/21/2011 09:25 AM, Adam Litke wrote:
> > We need to remember to update the VM cgroup if we change the
> > number of vCPUs on a running guest of course
>
> When can this happen?  Does libvirt support cpu hotplug?

Libvirt - yes, via virDomainSetVcpusFlags and similar API.  Hypervisors 
- different story.  Xen supports it, and at one point, qemu used to, but 
the qemu implementation was so buggy that current qemu does not support 
cpu hotplug.

--
Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org