CONFIG_CRYPTO_DEV_VMX is not available for the selected architecture x86.
Result is shown for architecture powerpc
Support for VMX cryptographic acceleration instructions
configname: CONFIG_CRYPTO_DEV_VMX
Linux Kernel Configuration
└─>Accelerated Cryptographic Algorithms for CPU (powerpc)
└─>Support for VMX cryptographic acceleration instructions
In linux kernel since version 3.10 (release Date: 2013-06-30)
Support for VMX cryptographic acceleration instructions.