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

Secure virtual machine (SVM) support for POWER

modulename: svm.ko

configname: CONFIG_PPC_SVM

Linux Kernel Configuration
└─>Secure virtual machine (SVM) support for POWER
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
There are certain POWER platforms which support secure guests using
the Protected Execution Facility, with the help of an Ultravisor
executing below the hypervisor layer. This enables support for
those guests.

If unsure, say "N".

source code: