Simply read the manual:
https://docs.netapp.com/us-en/ontap-select/reference_plan_ots_hardware.html
tldr; server-grade Intel CPU-powered ESXi, Sandy Bridge and later.
It "works" on non-server Intel CPUs, and I guess on AMD CPUs as well, but it doesn't matter - that's not supported and is therefore out of scope.
KVM is currently supported only by older versions of ONTAP Select that no longer ship, so information for those versions may be available in Release Notes for those older ONTAP Select releases, or the IMT.