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by nijave 22 days ago
IBM mainframes might but I have a very shallow understanding.

Found this https://sixe.eu/news/kvm-nested-vms-ibm-power-linux-lpar
1 comments
bonzini 22 days ago
That's exactly the same as x86. Nested virtualization support is almost entirely in the hypervisor.
link
nijave 22 days ago
x86 doesn't have a firmware hypervisor that allows splitting into LPARs.

That's showing 3 layers of nesting: LPAR, hypervisor, nested hypervisor

link
bonzini 21 days ago
On POWER, LPARs and the first level of hypervisor do not use any LPAR-specific nesting support in the processor. It's all handled by the firmware, not the hardware.
link