[Nyandalized]

>You can't physically swap out a processor while the system is booted and you can't swap a virtual processor either.

I think you can do that on multisocket systems:

https://www.kernel.org/doc/html/v4.14/core-api/cpu_hotplug.h...

[Filligree]

If the hardware supports it, yes, but only with basically the same type of processor.