Hi, On Mon, Apr 28, 2014 at 11:58:38AM -0600, Chris Friesen wrote: > Hi, > > I'm trying to figure out what the current status is for cpu hotplug > and hot-remove on x86_64. > > As far as I can tell, it seems like currently there is a QMP > "cpu-add" command but no matching remove...is that correct?
correct. "cpu-add" is the way to hot-add CPUs. There is no support for cpu hot-remove at this point. The latest patchset for cpu hot-remove that I know of is: http://lists.gnu.org/archive/html/qemu-devel/2013-12/msg04266.html If I understand correctly the biggest hurdle is supporting vcpu destruction during the VM lifetime on the kvm host side. The corresponding kvm patches have not been accepted: http://comments.gmane.org/gmane.comp.emulators.kvm.devel/114347 So I have the same question as you: Is there any plan to support cpu hot-remove? thanks, - Vasilis
