CONFIG_VIRTIO_DMA_SHARED_BUFFER (not configurable)

modulename: virtio_dma_buf.ko

configname: CONFIG_VIRTIO_DMA_SHARED_BUFFER

Linux Kernel Configuration
└─>Device Drivers
└─>Virtio drivers
└─>VIRTIO_DMA_SHARED_BUFFER
In linux kernel since version 5.1 (release Date: 2019-05-05)  
This option adds a flavor of dma buffers that are backed by
virtio resources.

source code: