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XBF(4) Device Drivers Manual XBF(4)

xbfXen Blkfront virtual disk

xbf* at xen?

The xbf driver provides support for a paravirtual disk interface "Blkfront", native to the Xen hypervisor.

During attach the xbf driver will ask the hypervisor to switch all configured virtual disks over to the Blkfront interface regardless of the VM configuration.

autoconf(4), intro(4), xen(4)

The xbf driver first appeared in OpenBSD 6.1.

The xbf driver was written by Mike Belopuhov <> based on the vdsk(4) driver by Mark Kettenis <>, inspired by the FreeBSD implementation.

December 7, 2016 OpenBSD-6.3