block device driver. It communicates with a back-end driver
in another domain which drives the actual block device.
+config XEN_BLKDEV_BACKEND
+ tristate "Block-device backend driver"
+ depends on XEN_BACKEND
+ help
+ The block-device backend driver allows the kernel to export its
+ block devices to other guests via a high-performance shared-memory
+ interface.
+
config VIRTIO_BLK
tristate "Virtio block driver (EXPERIMENTAL)"
depends on EXPERIMENTAL && VIRTIO