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#1 2018-10-28 10:37:52

Harey
Member
From: Bavaria, Germany
Registered: 2007-03-24
Posts: 319

[SOLVED] IOMMU DebugFS SUPPORT HAS BEEN ENABLED IN THIS KERNEL

The new kernel linux 4.19.arch1-1 generates this warning in journal:

Okt 28 11:27:54 gruenix kernel: *************************************************************
Okt 28 11:27:54 gruenix kernel: **     NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE    **
Okt 28 11:27:54 gruenix kernel: **                                                         **
Okt 28 11:27:54 gruenix kernel: **  IOMMU DebugFS SUPPORT HAS BEEN ENABLED IN THIS KERNEL  **
Okt 28 11:27:54 gruenix kernel: **                                                         **
Okt 28 11:27:54 gruenix kernel: ** This means that this kernel is built to expose internal **
Okt 28 11:27:54 gruenix kernel: ** IOMMU data structures, which may compromise security on **
Okt 28 11:27:54 gruenix kernel: ** your system.                                            **
Okt 28 11:27:54 gruenix kernel: **                                                         **
Okt 28 11:27:54 gruenix kernel: ** If you see this message and you are not debugging the   **
Okt 28 11:27:54 gruenix kernel: ** kernel, report this immediately to your vendor!         **
Okt 28 11:27:54 gruenix kernel: **                                                         **
Okt 28 11:27:54 gruenix kernel: **     NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE    **
Okt 28 11:27:54 gruenix kernel: *************************************************************

From what I can tell, this looks severe. Is this only on my system or is it a basic kernel problem?

Greetings
Harvey

Last edited by Harey (2018-11-05 13:59:58)


Linux is like a wigwam: No Gates, no Windows and an Apache inside

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#2 2018-10-28 12:51:07

Lone_Wolf
Member
From: Netherlands, Europe
Registered: 2005-10-04
Posts: 6,424

Re: [SOLVED] IOMMU DebugFS SUPPORT HAS BEEN ENABLED IN THIS KERNEL

It appears that's  a new option introduced here :  https://git.kernel.org/pub/scm/linux/ke … e4e229baca

Looks like the question should be :
Why does archlinux kernel enable this new option ?

I suggest you create a bug report.

Last edited by Lone_Wolf (2018-10-28 13:40:13)


Multi-init booting with apg Openrc and systemd coexisting
Automounting : not needed, i prefer pmount
Aur helpers : makepkg + my own local repo === rarely need them

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#3 2018-10-28 13:27:34

damjan
Member
Registered: 2006-05-30
Posts: 401

Re: [SOLVED] IOMMU DebugFS SUPPORT HAS BEEN ENABLED IN THIS KERNEL

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#4 2018-10-28 16:35:02

Harey
Member
From: Bavaria, Germany
Registered: 2007-03-24
Posts: 319

Re: [SOLVED] IOMMU DebugFS SUPPORT HAS BEEN ENABLED IN THIS KERNEL

Thank you both for your input. So let's see what the devs decide...


Linux is like a wigwam: No Gates, no Windows and an Apache inside

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#5 2018-11-05 00:40:56

WFV
Member
From: right here right now ℶ
Registered: 2013-04-23
Posts: 226

Re: [SOLVED] IOMMU DebugFS SUPPORT HAS BEEN ENABLED IN THIS KERNEL

try re-install, it looks disabled now

Last edited by WFV (2018-11-05 00:42:17)

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#6 2018-11-05 13:59:32

Harey
Member
From: Bavaria, Germany
Registered: 2007-03-24
Posts: 319

Re: [SOLVED] IOMMU DebugFS SUPPORT HAS BEEN ENABLED IN THIS KERNEL

Yep. Solved with 4.19.1


Linux is like a wigwam: No Gates, no Windows and an Apache inside

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