Re: [Linux-4.19] ThinkPad T470 not booting with "intel_iommu=on"

From: Sedat Dilek <sedat.dilek-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Jordan Glover <Golden_Miller83-g/b1ySJe57IkP3XJZ0H8fw@public.gmane.org>
Cc: "iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org"
	<iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>
Subject: Re: [Linux-4.19] ThinkPad T470 not booting with "intel_iommu=on"
Date: Wed, 26 Sep 2018 08:52:27 +0200	[thread overview]
Message-ID: <CA+icZUUpm4hpvvSH=89f=m-17TCy-yaOpOov7hCWYcyQGSSCkw@mail.gmail.com> (raw)
In-Reply-To: <Y4FGoptRtN0PmXRXowjeM1LOeXvkP6eun7cr-EgiREHf4fyX3eYz75NTVIpu6VYe6cRIrcRD1Yxy5OiyG_7a1AnrOFKcQhuOGpTvSJlsvt4=@protonmail.ch>

On Tue, Sep 25, 2018 at 7:01 PM, Jordan Glover
<Golden_Miller83@protonmail.ch> wrote:
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Tuesday, September 25, 2018 1:57 PM, Joerg Roedel <joro@8bytes.org> wrote:
>
>> Lu,
>>
>> can you please have a look at this problem?
>>
>> On Wed, Sep 05, 2018 at 02:04:38PM +0200, Sedat Dilek wrote:
>>
>> > Hi Joerg,
>> > "intel_ioomu=on" was working fine here on my ThinkPad T470 with
>> > debian/testing AMD64 with Linux v4.17.y and v4.18.y.
>> > With testing Linux v4.19-rc1 and v4.19-rc2 my machine is not booting -
>> > black screen.
>> > These kernels are built with LLVM/Clang v7.0.0rc2 (v4.18.y too).
>> > Furthermore, I switched from GRUB to systemd-boot v239.
>> > [ /boot/efi/loader/entries/debian.conf ]
>> > title Debian GNU/Linux buster/sid [ debian kernel ]
>> > linux /vmlinuz-4.17.0-3-amd64
>> > initrd /initrd.img-4.17.0-3-amd64
>> > options root=UUID=4c2aa544-6e86-44d2-9329-572623867b3d ro intel_iommu=on
>> > [ /boot/efi/loader/entries/debian-llvmlinux.conf ]
>> > title Debian GNU/Linux buster/sid [ llvmlinux kernel (EXPERIMENTAL) ]
>> > linux /vmlinuz-4.19.0-rc2-3-iniza-llvmlinux
>> > initrd /initrd.img-4.19.0-rc2-3-iniza-llvmlinux
>> > options root=UUID=4c2aa544-6e86-44d2-9329-572623867b3d ro
>> > Any hints or hints to debug this?
>> > Any other kernel boot cheats [1] I can try?
>> > My kernel-config and dmesg output is attached.
>> > Thanks in advance.
>> > Regards,
>> >
>> > -   Sedat -
>> >
>
> This was reported couple weeks ago in few places, i.e.:
> https://bugs.freedesktop.org/show_bug.cgi?id=107783
>
> Lu already prepared fix which you supposedly merged:
> https://lore.kernel.org/patchwork/patch/980077/#1175020
>
> There was even v2 of the above which links to bug I posted:
> https://lore.kernel.org/patchwork/patch/983690/
>
> Sedat confirmed it fixes the issue:
> https://lists.linuxfoundation.org/pipermail/iommu/2018-September/030139.html
>
> Please include aforementioned patch in iommu-fixes and send it to Greg for -rc6.
>

Here some details:

# cat /proc/version
Linux version 4.19.0-rc5-1-iniza-llvmlinux
(sedat.dilek@gmail.com@iniza) (clang version 7.0.0-2
(tags/RELEASE_700/final)) #1 SMP 2018-09-24

[    0.143880] Kernel command line:
initrd=\initrd.img-4.19.0-rc5-1-iniza-llvmlinux root=UUID=myRootFSUUID
ro intel_iommu=on
[    0.143906] DMAR: IOMMU enabled
[  155.795347] vboxpci: IOMMU found

Thanks,
- Sedat -
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