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problem with IOMMU to be activated

asked 2018-07-21 08:50:09 -0600

boistordu gravatar image


I have some problems with activating the iommu option.

I'm under fedora 28 mobo asrock z270 professionnal gaming i7-7700k

The reason that I'm specifying the configuration is because I read that there was some motherboards that doesn't include IOMMU module, I don't know if that's true?

so I have the kernel acs patch installed and booted from, I've modified /etc/default/grub to have this :

ora_localhost-live/root intel_iommu=on rhgb

and then reconfigure the grub loader with : sudo grub2-mkconfig -o /boot/grub2/grub.cfg

but if I do find /sys/kernel/iommu_groups/ -type l after the reboot, I have nothing as result.

if I do dmesg | grep DMAR, I only have this:

[    0.000000] ACPI: DMAR 0x000000005E272088 0000A8 (v01 INTEL  KBL      00000001 INTL 00000001)
[    0.001000] DMAR: Host address width 39
[    0.001000] DMAR: DRHD base: 0x000000fed90000 flags: 0x0
[    0.001000] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap 1c0000c40660462 ecap 19e2ff0505e
[    0.001000] DMAR: DRHD base: 0x000000fed91000 flags: 0x1
[    0.001000] DMAR: dmar1: reg_base_addr fed91000 ver 1:0 cap d2008c40660462 ecap f050da
[    0.001000] DMAR: RMRR base: 0x0000005e058000 end: 0x0000005e077fff
[    0.001000] DMAR: RMRR base: 0x0000005f800000 end: 0x0000006fffffff
[    0.001000] DMAR-IR: IOAPIC id 2 under DRHD base  0xfed91000 IOMMU 1
[    0.001000] DMAR-IR: HPET id 0 under DRHD base 0xfed91000
[    0.001000] DMAR-IR: Queued invalidation will be enabled to support x2apic and Intr-remapping.
[    0.002000] DMAR-IR: Enabled IRQ remapping in x2apic mode
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@boistorduUEFI Legal BIOSSpecification ====> execute grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfgGRUB_2

hhlp gravatar imagehhlp ( 2018-07-21 09:36:25 -0600 )edit

what does the GRUB_2 says?

boistordu gravatar imageboistordu ( 2018-07-21 10:10:10 -0600 )edit

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answered 2018-07-21 10:14:05 -0600

boistordu gravatar image

thanks to @hhlp it activated IOMMU, didn't think about EFI bios repo.

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Asked: 2018-07-21 08:50:09 -0600

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Last updated: Jul 21 '18