On Sun, 19 Aug 2018 22:57:44 +0200 Konrad Eisele <eisel...@gmail.com> wrote:
> I try to passthrough the primary graphic card (GForce 710b > at slot 0000:01:0.0) to a win kvm guest. The host runs > headless. I have blacklisted the nvidia drivers and bound > the drivers to vfio-pci on startup. However when starting qemu > I currently get the error: > > (qemu) qemu-system-x86_64: -device vfio-pci,host=01:00.0,multifunction=on: > Failed to mmap 0000:01:00.0 BAR 3. Performance > may be slow > > It seems that efifb is jumping in and allocating some region: > > $cat /proc/iomem > ... > 0000000-00000000 : PCI Bus 0000:00 > 00000000-00000000 : PCI Bus 0000:01 > 00000000-00000000 : 0000:01:00.0 > 00000000-00000000 : vfio-pci > 00000000-00000000 : 0000:01:00.0 > 00000000-00000000 : efifb > 00000000-00000000 : PCI Bus 0000:03 > 00000000-00000000 : 0000:03:00.0 > ... > > So I added efifb:off to grub's kernel cmdline > > cat /proc/cmdline: > .... video=vesafb:off,efifb:off > > However that doesnt seem to help. Does anybody know howto > prevent the above error? > What more do I have to do to passthrough the primary graphics card to a > guest > running on a headless server? Any tips? This is generally why it's not recommended, iterate through what's using resources on the card until you've exhausted and disabled all possible console drivers for your device. You'll likely also need to use a dumped ROM image for the card since the ROM for the primary graphics is read from the shadow ROM space where it can be updated in place by the execution of the ROM. Thanks, Alex _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
