CONFIG_PARAVIRT_XXL is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT

CONFIG_PARAVIRT_XXL (not configurable)

configname: CONFIG_PARAVIRT_XXL

Linux Kernel Configuration
└─>Processor type and features
└─>Linux guest support
└─>PARAVIRT_XXL
In linux kernel since version 3.10 (release Date: 2013-06-30)