CONFIG_ARCH_VIRT is not available for the selected architecture x86.
Result is shown for architecture riscv

CONFIG_ARCH_VIRT (not configurable)

configname: CONFIG_ARCH_VIRT

Linux Kernel Configuration
└─>SoC selection
└─>ARCH_VIRT
In linux kernel since version 3.1 (release Date: 2011-10-24)