[vfio-users] VFIO not claiming device

thibaut noah thibaut.noah at gmail.com
Fri Apr 22 22:24:13 UTC 2016

My grub line :
"GRUB_CMDLINE_LINUX_DEFAULT="rd.modules-load=vfio-pci quiet
intel_iommu=on,igfx_off pcie_acs_override=downstream" (igfx_off is because
i cannot boot otherwise, got some graphic glitch at boot, if you don't have
it feel, free to remove itr"

Don't forget to update grub afterwards. It is weird though, rd.modules-load
is on others tutorials but not on arch wiki.
I believe that was the issue i had when first trying to get vfio to grab
the device on antergos first time i wanted to do this.

2016-04-23 0:10 GMT+02:00 Alex Williamson <alex.l.williamson at gmail.com>:

> On Fri, Apr 22, 2016 at 4:06 PM, Brett Peckinpaugh <erylflynn at gmail.com>
> wrote:
>> To start I am now running Arch with the VFIO kernel, I did not compile
>> with the i915, my machine failed to boot with that last time.  Currently I
>> can't seem to get VFIO to claim the devices I want to pass-through.  You
>> can see kernel driver is still nvidia.  I added my configs below.  I even
>> tried a script.  Every time I modify mkinitcpio.conf I regenerate my
>> intramfd with mkinitcpio -p linux-vfio
>> What am I missing?
>> lspci -nnk -d 10de:1087
>> 02:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF110
>> [GeForce GTX 560 Ti 448 Cores] [10de:1087] (rev a1)
>>         Subsystem: NVIDIA Corporation Device [10de:0000]
>>         Kernel driver in use: nvidia
>>         Kernel modules: nouveau, nvidia_drm, nvidia
>> /etc/mkinitcpio.conf
>> MODULES="vfio vfio_iommu_type1 vfio_pci vfio_virqfd"
>> kernel boot options.
>> intel_iommu=on pcie_acs_override=downstream rd.driver.pre=vfio-pci
> You're applying Fedora instructions to Arch, rd.driver.pre apparently
> doesn't do anything on Arch.  Look in the archive for the past couple
> weeks, I believe there are some working instructions there.
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