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About add-support-for-cpu-hotadd

I'm interested in Openstack cpu hotadd, I found Openstack wiki about cpu hotadd(

I follow first step:

Add extra key to flavor to define the instance's current CPU key:"cpu:current" value:"2"

I do this command: nova flavor-key cpu set cpu:current=2

and then second step:Create VM with max VCPU in flavor.

The instance's XML looks like:

< vcpu current="2">4 </vcpu>

so I create instance with this flavor. But instance's xml not<vcpu current="2">4</vcpu> but <vcpu>4</vcpu>

Does anyone finished vcpu hotadd?