Genode 15.11 puts emphasis on desktop computing

With the just released version 15.11, the Genode OS framework takes a big step towards desktop computing. On that account, its GUI and audio stacks have become much more modular, dynamic, and flexible. Moreover, the release features the port of Intel KMS from Linux, extends the support for the USB Armory and Xilinx Zynq-7000, and introduces new file-system infrastructure such as a VFS server.In their release documentation, the Genode developers dedicate an entire section (including screenshots) to the ambition to use Genode as desktop OS. It turns out that the framework's existing component architecture solves a number of difficult problems in new and elegant ways. For example, the configuration of all types of components - be it low-level device drivers or high-level GUI components - can be edited live with a plain text editor. The changes become effective by merely saving a file. This works even for components that have no means or permissions to access a file system at all. Another interesting twist on classical GUI-integration features is Genode's new copy-and-paste mechanism that prevents the clipboard to be misused by malicious applications as a covert information channel while retaining the convenience of traditional clipboard mechanisms.At a lower level, the desktop theme of the release is supported by the new Intel KMS driver ported from the Linux kernel. It allows the use of multiple displays, and screen resolutions can be switched on the fly. With nearly 70,000 SLOC of Linux kernel code, the porting was a major feat. This work continues the pattern of reusing Linux kernel code, which already enabled Genode to use the Intel wireless stack, the Linux USB stack, and the Linux TCP/IP stack as user-level components. The Intel KMS driver is interesting also in another respect: Since it is tightly coupled with the Intel GEM and DRM infrastructure of the Linux kernel, those subsystems had to be ported as well. So the driver may become a suitable starting point for the development of a future GPU multiplexer.Thanks to the developer's continuous focus on making the framework fit for day-to-day computing, Genode is now used by a hand full of die-hard Genode enthusiasts as their primary OS. Still, many tasks are carried out via a guest OS in VirtualBox. But all of the circa 40 underlying components such as the kernel, device drivers, protocol stacks, and a growing number of applications are working nicely together and are stable and fast enough to get productive work done.Besides the main focus on desktop computing, the release is not short of other areas of improvement. Xilinx Zynq-7000 has been added to the supported platforms, TrustZone on the USB Armory received a lot of attention, and a new VFS server makes Genode's file-system infrastructure much more flexible. Those and many more topics are covered by the detailed release documentation.