> On 3 Jan 2018, at 16:00, Alex Williamson <alex.william...@redhat.com> wrote: > > On Wed, 3 Jan 2018 10:09:49 +0200 > Dmitry Fleytman <dmitry.fleyt...@gmail.com > <mailto: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 > <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,
Thanks, Alex! We will try. > > Alex
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