Hi,
On 10/16/18 3:56 PM, Sedat Dilek wrote:
On Tue, Oct 16, 2018 at 8:37 AM Lu Baolu <[email protected]> wrote:
Hi Sedat,
Sorry for late reply.
Do you still have this issue with newer rc's (like 4.19-rc8)?
I checked the dmesg log you attached there, it seems that the vt-d was
not on actually.
Hi Lu,
Thanks for asking.
I am running a Clang-7 compiled Linux 4.19-rc6 and VirtualBox is
reporting "IOMMU found".
root@iniza:~# dmesg | grep -i iommu
[ 0.000000] Command line: initrd=\initrd.img-4.19.0-rc6-1-amd64-cbl
root=UUID=4c2aa544-6e86-44d2-9329-572623867b3d ro intel_iommu=on
[ 0.145385] Kernel command line:
initrd=\initrd.img-4.19.0-rc6-1-amd64-cbl
root=UUID=4c2aa544-6e86-44d2-9329-572623867b3d ro intel_iommu=on
[ 0.145411] DMAR: IOMMU enabled
[ 0.243068] DMAR-IR: IOAPIC id 2 under DRHD base 0xfed91000 IOMMU 1
[ 0.893466] iommu: Adding device 0000:00:00.0 to group 0
[ 0.893475] iommu: Adding device 0000:00:02.0 to group 1
[ 0.893490] iommu: Adding device 0000:00:14.0 to group 2
[ 0.893498] iommu: Adding device 0000:00:14.2 to group 2
[ 0.893508] iommu: Adding device 0000:00:15.0 to group 3
[ 0.893519] iommu: Adding device 0000:00:16.0 to group 4
[ 0.893545] iommu: Adding device 0000:00:1c.0 to group 5
[ 0.893564] iommu: Adding device 0000:00:1c.6 to group 6
[ 0.893580] iommu: Adding device 0000:00:1d.0 to group 7
[ 0.893598] iommu: Adding device 0000:00:1d.2 to group 8
[ 0.893624] iommu: Adding device 0000:00:1f.0 to group 9
[ 0.893632] iommu: Adding device 0000:00:1f.2 to group 9
[ 0.893640] iommu: Adding device 0000:00:1f.3 to group 9
[ 0.893648] iommu: Adding device 0000:00:1f.4 to group 9
[ 0.893656] iommu: Adding device 0000:00:1f.6 to group 9
[ 0.893676] iommu: Adding device 0000:04:00.0 to group 10
[ 0.893693] iommu: Adding device 0000:3e:00.0 to group 11
[ 1.116440] AMD IOMMUv2 driver by Joerg Roedel <[email protected]>
[ 1.116463] AMD IOMMUv2 functionality not available on this system
[ 42.117773] vboxpci: IOMMU found
How can I be sure Intel-IOMMU is working correctly beyond checking dmesg logs?
Perhaps you need to check whether you've configured your VirtualBox to
simulate an Intel-IOMMU device.
Best regards,
Lu Baolu
[1] recommends to check...
root@iniza:~# find /sys | grep dmar
Shall I re-check with Linux v4.19-rc8?
Thanks in advance.
Regards,
- Sedat -
[1]
https://stackoverflow.com/questions/44286683/check-for-iommu-support-on-linux
[2] https://www.kernel.org/doc/Documentation/Intel-IOMMU.txt
Best regards,
Lu Baolu
On 9/5/18 8:04 PM, 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 -
Documentation/intel_txt.txt
Documentation/admin-guide/kernel-parameters.txt
Documentation/Intel-IOMMU.txt
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/kernel-parameters.txt#n1645
[2]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/Intel-IOMMU.txt
[3]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/intel_txt.txt
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