[$] Supporting virtual reality displays in Linux

<p>At linux.conf.au (LCA) 2017 in Hobart, Tasmania, Keith Packard talked withkernel graphics maintainer Dave Airlie about how virtual reality devices should be hooked up toLinux. They both thought it would be pretty straightforward to do, so itwould "only take a few weeks", but Packard knew"in reality it would take a lot longer". In atalk at LCA 2018 in Sydney, Packard reported back on the progress he hasmade; most of it is now in the upstream kernel.