CONFIG_PPC_UV is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Ultravisor support

configname: CONFIG_PPC_UV

Linux Kernel Configuration
└─>Kernel options
└─>Ultravisor support
In linux kernel since version 5.1 (release Date: 2019-05-05)  
This option paravirtualizes the kernel to run in POWER platforms that
supports the Protected Execution Facility (PEF). On such platforms,
the ultravisor firmware runs at a privilege level above the
hypervisor.

If unsure, say "N".