How to automatically use HOTPLUGGED CPUs

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I am using libvirt with Tiny Core guests. When I increase the number of CPUs the new CPUs are not automatically being used.

They show up in /sys/devices/system/cpu/ and I can start using them by doing

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echo 1 > /sys/devices/system/cpu/cpu1/online

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Okay I had to add a udevd rule 

Following this https://support.host1plus.com/index.php?/Knowledgebase/Article/View/1357/0/how-to-enable-memorycpu-hot-plugging-on-my-linux-server

I created

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/etc/udev/rules.d/40-cpu-hotplug.rules
containing

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# CPU hotadd request
SUBSYSTEM=="cpu", ACTION=="add", TEST=="online", ATTR{online}=="0", ATTR{online}="1"

Is this something that can be added to Tiny Core?

[curaga]

I think hotplugging cpus is fairly niche use, with most VM users setting the cpu count before starting?

You can either remaster the rule in, or include it in your backup and command udev to reload rules in bootlocal.sh.