[vfio-users] VIFO in Intel Graphics Not working

[Chris]

Hi Alex,
thanks for your - rather amusing - comments :) after a certain time you start experimenting without thinking too much - unfortunately I'm still not any further after revising, same issues:


Am 8. Mai 2018 21:55:03 MESZ schrieb Alex Williamson <alex.williamson at redhat.com>:
>On Tue, 08 May 2018 21:21:29 +0200
>Chris <kaspro at web.de> wrote:
>> # cat /etc/modprobe.d/vfio.conf
>> options vfio-pci ids=8086:1902
>> options vfio-pci disable_vga=1
>
>VGA support is required for legacy mode IGD assignment, why is it being
>disabled?
Must've read too much - removed line.


>> # cat /etc/modprobe.d/blacklist.conf
>> blacklist i915
>> 
>> # dracut -f /boot/initramfs-4.16.5-300.fc28.x86_64.img
>4.16.5-300.fc28.x86_64
>> # reboot
>> # dmesg | grep -e DMAR -e IOMMU
>> Kernel command line: BOOT_IMAGE=/vmlinuz-4.16.5-300.fc28.x86_64
>root=/dev/mapper/fedora-root00 ro rd.lvm.lv=fedora/root00
>rd.lvm.lv=fedora/swap rhgb quiet LANG=en_US.UTF-8 intel_iommu=on
>rd.driver.pre=vfio-pci bochs_drm.fbdev=off
>video=efifb:off,vesa:off,vesafb:off vga=normal iommu=no-igfx
>
>Disabling the IOMMU for igfx when you're trying to use the IOMMU to
>assign igfx seems like a bad idea, but luckily the option would have
>been intel_iommu=igfx_off so the option was wrong on both ends.
:D you kinda have a point. Switched back to "on" - as tried before.

>> 3.: Configuring a guest with UEFI BIOS, 440FX Chipset gives (and
>thousands of these... not just some): 
>> [ 3419.435439] DMAR: DRHD: handling fault status reg 2 
>> [ 3419.435446] DMAR: [DMA Write] Request device [00:02.0] fault addr
>0 [fault reason 02] Present bit in context entry is clear 
>> [ 3419.436683] DMAR: DRHD: handling fault status reg 3 
>> [ 3419.436691] DMAR: [DMA Read] Request device [00:02.0] fault addr
>afa40000 [fault reason 06] PTE Read access is not set 
>> [ 3419.438069] DMAR: DRHD: handling fault status reg 3 
>> [ 3419.438076] DMAR: [DMA Read] Request device [00:02.0] fault addr
>afa40000 [fault reason 06] PTE Read access is not set 
>> [ 3419.439473] DMAR: DRHD: handling fault status reg 3 
>> [ 3419.439480] DMAR: [DMA Read] Request device [00:02.0] fault addr
>afa6e000 [fault reason 06] PTE Read access is not set 
>> [ 3419.440872] DMAR: DRHD: handling fault status reg 3 
>> [ 3419.440879] DMAR: [DMA Read] Request device [00:02.0] fault addr
>afaa6000 [fault reason 06] PTE Read access is not set
>
>This is what happens when the VBIOS tries to use the host stolen memory
>because the quirks are disabled because QEMU doesn't have access to VGA
>regions.
>Thanks,
>Alex

Unfortunately it's still at the same stage... same error messages after reboots.
Thanks a lot,
Chris
-- 
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