On Thu, 5 Jan 2017 19:14:29 +0100 Ede Wolf <lis...@nebelschwaden.de> wrote:
> Hello, > > Running arch, I am having a windows XP guest, to which I am passing > through a PCIe Parallel Card, that again talks to a device that > unfortunately is very picky about interrupts and more so the interrupt > setting within Windows XP for that parallel port. > > For a short explanation: Windows XP offers 3 ways to operate the > parallel port: > "never use an interrupt" > "try not to use an interrupt" > "Use any interrupt assigned to that port" > > My device requires the last option, otherwise communication does simply > not work, albeit the device itself is detected. So it seems, that > whatever setting I choose within windows xp, it is now ignored and does > not make any difference any more. > > However, it used to work perfectly fine up to Kernel 4.5. or 4.6, I do > not remember exactly, but does not work any more with 4.8. Skipped 4.7 > for sure. > > Booting into the 4.4-lts kernel makes things work as expected, booting > into 4.8.x and communication is broken again. Can be repeated at will > with consistently the same results and holds true now for several > incarnations of the 4.8 kernel the archlinux team has provided so far. > > Now I am wondering: Is there any compelling configuration change that I > am not aware of or is this simply a bug? And if, is this related to vfio > or other parts of the kernel and this the wrong place? > > Thanks for any help Any chance you could narrow down where this broke a little further, perhaps even bisecting the kernel to a specific commit? Thanks, Alex _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
