[vfio-users] Passing intel_iommu=on in grub causes boot to immediately lock on two different X58 LGA1366 MB.

[Brian Yglesias]

That's disappointing.  I would not have purchased this board were it not for:

https://docs.google.com/spreadsheets/d/1LnGpTrXalwGVNy0PWJDURhyxa3sgqkGXmvNCIvIMenk/edit?pref=2&pli=1#gid=

----- Original Message -----
From: "A de Beus" <anthony.debeus at gmail.com>
To: "Alex Williamson" <alex.l.williamson at gmail.com>
Cc: "Brian Yglesias" <brian at atlanticdigitalsolutions.com>, "vfio-users" <vfio-users at redhat.com>
Sent: Wednesday, May 18, 2016 6:26:16 PM
Subject: Re: [vfio-users] Passing intel_iommu=on in grub causes boot to immediately lock on two different X58 LGA1366 MB.

Make sure you have the latest BIOS for that board. Some of the ASUS boards needed an update for IOMMU.

> On May 18, 2016, at 2:28 PM, Alex Williamson <alex.l.williamson at gmail.com> wrote:
> 
> [re-adding vfio-users]
> 
>> On Wed, May 18, 2016 at 1:48 PM, Brian Yglesias <brian at atlanticdigitalsolutions.com> wrote:
>> I've attached with quiet removed (should have done that already).
>> 
>> Nothing jumps out at me, hopefully someone else will see something.
>> 
>> With iommu=pt in lieu of intel_iommu=on the system boots, but no iommu support.  If I append iommu=pt it continues to hard lock.
>> 
>> I've included two images.
>> 
>> It does seem to be somehow iommu related.
>> 
>> I found this post on centos forums:
>> 
>> https://www.centos.org/forums/viewtopic.php?t=46809
>> 
>> That seems to be the same problem with a non-X58 board.  Unfortunately, I don't have the BIOS setting he appears to have used to fix it.
>> 
>> Thanks for all the help thus far.
>> 
>> I'm going to post on Gigabyte forums.  I've seen on both the archlinux forum and the former that ppl have gotten iommu working with this board, which is why I bought it.  Not sure what my problem could be yet.
>> 
> 
> I don't think that centos issue is related, that's a DMA alias issue with broken I/O hardware.  What you're seeing is a hang in qi_submit_sync(), which is an impossible hang according the hardware specs, but comes up a fair bit more often than never.  AIUI, it means that magic, undocumented bits in hardware aren't set the way they should be and you're going to need to hope for a BIOS update, which is all but impossible on a system as old as X58.  Good luck :-\
> 
> Alex
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