MAP_VPAGETABLE has been removed in DragonFly because of conflicts with recent pmap work.  This has the unfortunate effect of breaking vkernel(7), but vkernels can be resurrected with changes to use hardware virtualization support.

Note that running DragonFly as a VM is unaffected; that’ll still work just fine.   This breakage is DragonFly-vkernel-on-DragonFly specific.