Say Y here to get to see options for using your Linux host to run other operating systems inside virtual machines (guests). This option alone does not add any kernel code. If you say N, all options in this submenu will be skipped and disabled.
Support hosting paravirtualized guest machines using the SIE virtualization capability on the mainframe. This should work on any 64bit machine. This module provides access to the hardware capabilities through a character device node named /dev/kvm. To compile this as a module, choose M here: the module will be called kvm. If unsure, say N.
Allow CAP_SYS_ADMIN users to create KVM virtual machines that are controlled by userspace. If unsure, say N.