Arch Linux

tomsk

Member

Registered: 2016-12-17

Posts: 224

[SOLVED] No IOMMU groups

I set

intel_iommu=on

in

/etc/default/grub

and restarted PC and when I run:

#!/bin/bash
shopt -s nullglob
for g in /sys/kernel/iommu_groups/; do
    echo "IOMMU Group ${g##/}:"
    for d in $g/devices/; do
        echo -e "\t$(lspci -nns ${d##/})"
    done;
done;

I get no output why? Im on Arch, and my hardware supports iommu because I had Ubuntu with gpu passthrough and it worked, VT-d and virtualization technology are enabled in BIOS.

Last edited by tomsk (2019-10-19 17:19:20)

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I use several linux distros like: Archlinux, Ubuntu, Fedora, Linux Mint

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,412

Re: [SOLVED] No IOMMU groups

If you didn't regenerate your config yet that parameter will not be present yet. Double check

/proc/cmdline

in doubt.

tomsk

Member

Registered: 2016-12-17

Posts: 224

Re: [SOLVED] No IOMMU groups

Oh I forgot run

grub-mkconfig -o /boot/grub/grub.cfg

thanks

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I use several linux distros like: Archlinux, Ubuntu, Fedora, Linux Mint