Support for Xen hypercall interface

configname: CONFIG_KVM_XEN

Linux Kernel Configuration
└─>Virtualization
└─>Support for Xen hypercall interface
In linux kernel since version 5.2 (release Date: 2019-07-07)  
Provides KVM support for the hosting Xen HVM guests and
passing Xen hypercalls to userspace.

If in doubt, say "N".