QEMU GPU vfio-pci pass through

@white
To quote my qmiga.codeberg.page
"Amiga NG emulation in QEMU is something I did for personal interest and work on it in my (limited) free time. It comes without any support and it's not expected to be complete or do everything one may desire or dream about. It's not a commercial product with a roadmap or any goal and may eternally remain a work in progress which may never get finished. Its future depends on what the open source community makes of it. Keep this in mind when trying this."

All this is experimental. There's nobody who can tell you what would work and what wouldn't as probably nobody tried that before. Just a few weeks ago there was a patch on QEMU devel list to remove vfio-pci from qemu-system-ppc because people didn't know it works as it was never written for that. I've replied and they were surprised to find it working so it will stay but still mostly untested. So cards that have an AmigaOS driver could work but depending on your host machine and its firmware settings it may or may not work.

I think the highest chance to work have cards that were available at the time the machine emulated was used. It is not easy to set up as there are a lot of things that could go wrong and mostly these are undocumented. If you find a card that's known to work on real AmigaOne or PegasosII then you can set it up to work in QEMU for pass-through with a Linux or Windows guest (not host, but guest, forget about AmigaOS and PPC first, just make it work with some guest that's better documented to work with such setup, there should be guides on how to set up GPUs with older Windows guest on Linux host for games). After you have that working you can try AmigaOS but it's still not guaranteed to work. This would be the most likely working way rather than buying the most powerful and newest card that is not even possible to connect to the real machine so it was never tried there and expect that to work on first try. That's just unrealistic expectation, keep more to what has been tested with real machine if you want to get less problems on the way or only buy things if you're ready to experiment and don't mind if it does not work.

@balaton
Thanks that's a clear answer.
And I'm glad it was you who said it.
So let's see when I get a chance to try something.
It'll be a way to pass some time.

http://hdrlab.org.nz/projects/amiga-o ... r-hardware-compatibility/