CONFIG_S390_HYPFS is not available for thedefaultarchitecture x86.
Result is shown for architecture s390

s390 hypervisor information

modulename: hypfs_dbfs.ko

and/or

hypfs_diag.ko

and/or

hypfs_diag0c.ko

and/or

hypfs_sprp.ko

and/or

hypfs_vm.ko

configname: CONFIG_S390_HYPFS

Linux Kernel Configuration
└─>Virtualization
└─>s390 hypervisor information
In linux kernel since version 4.14.327 (release Date: 2023-10-10)  
This provides several binary files at (debugfs)/s390_hypfs/ to
provide accounting information in an s390 hypervisor environment.

source code:
arch/s390/hypfs/hypfs_dbfs.c
is selected by
CONFIG_S390_HYPFS_FS