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pv_ops Kernel ignoring cpu hotplug under Xen 4 DomU

I have a Xen 4.0.1 DomU running Debian Squeeze with the stock 2.6.32-5 Kernel. When I add CPUs via xm-vcpu-set they correctly show up in /sys/devices/system/cpu but are not set online and ...
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Disable CPUs on boot but allow hotplug in Xen

I would like to create a Xen VM with 32 possible VCPUs but have the guest OS only enable 2 of them on boot. Are there some kernel parameters I can pass in to enable this? I've played around with ...