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

Sun4v Hypervisor Console support

modulename: sunhv.ko

configname: CONFIG_SERIAL_SUNHV

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>Sun4v Hypervisor Console support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This driver supports the console device found on SUN4V Sparc
systems. Say Y if you want to be able to use this device.

source code: