Virtio Filesystem Direct Host Memory Access support

configname: CONFIG_FUSE_DAX

Linux Kernel Configuration
└─>File systems
└─>Virtio Filesystem Direct Host Memory Access support
In linux kernel since version 5.1 (release Date: 2019-05-05)  
This allows bypassing guest page cache and allows mapping host page
cache directly in guest address space.

If you want to allow mounting a Virtio Filesystem with the "dax"
option, answer Y.