https://www.virtualbox.org/wiki/Changelog#v28 http://download.virtualbox.org/virtualbox/5.1.28/VirtualBox-5.1.28.tar.bz2
Created attachment 495844 [details] vbox-kernel-module-src-5.1.28.tar.xz (without vboxpci) It seems like virtualbox 5.1.28 works without vboxpci as a module! At least on my computer... When I build virtualbox 5.1.28 manually here, it does not automatically generate and build vboxpci, but it builds vboxdrv, vboxnetadp and vboxnetflt. And still my old Windows VM boots, at least... Attaching the kernel module sources that got generated when I built it on my machine as a vbox-kernel-module-src-5.1.28.tar.xz-file. Maybe it's a special case with my computer, because it seems like arch lists "vboxpci.ko.gz" as a module in their virtualbox-host-modules 5.1.28 package...
commit 462fbeff85629420d28b62ef19f6179fd542db96 Author: Lars Wendler <polynomial-c@gentoo.org> Date: Mon Oct 2 10:47:00 2017 virtualbox packages: Bump to version 5.1.28 (bug #631332). Package-Manager: Portage-2.3.10, Repoman-2.3.3