On Wed, 3 Jan 2018 10:09:49 +0200 Dmitry Fleytman <dmitry.fleyt...@gmail.com> wrote:
> Hello All, > > We're evaluating possibility of using IGD passthrough in legacy mode using > Apple laptops, like Macbook Air as a h/w platform. > > Apple laptops are using UEFI boot, according to lspci the options rom is > disabled: > [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] > > As a result when trying to launch QEMU IGD passthrough, the following error > is encountered: > qemu-system-x86_64: -device > vfio-pci,host=00:02.0,id=hostdev0,bus=pci.0,addr=0x2: IGD device 0000:00:02.0 > has no ROM, legacy mode disabled > > We tried to supply VBIOS binaries dumped from another platform with the same > graphics adaptor, but that did not work either: “legacy mode disabled” error > disappeared but the picture did not show up on the screen. > > Therefore, we would like to ask a number of questions: > > - What in your opinion would be the best way to make IGD passthrough > working on hardware like this? > - For UEFI only OSes, like MacOS, what are the missing parts required to > support UEFI VM with IGD passthrough? > > Your thoughts are welcome, You're on the right track with providing a ROM from another system, but IGD ROMs don't typically "just work", try rom-fixer on it to fix the device ID and checksum and make sure rom-parser reports a legacy ROM section: https://github.com/awilliam/rom-parser I've made IGD assignment work on a UEFI Lenovo laptop by temporarily booting a legacy OS, dumping the IGD ROM, booting back to UEFI, fixing the ROM, then passing it to QEMU via the file option. Thanks, Alex _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
