[vfio-users] Ryzen/X370 Chipset and IOMMU Groups

[Steven Walter]

Does it make any difference if you use the iommu=pt kernel command
line parameter?

On Mon, Mar 27, 2017 at 11:12 AM, Nick Sarnie <commendsarnex at gmail.com> wrote:
> The ticket is still open, but it wouldn't fix a hang on startup. Do you see
> any errors in dmesg?
>
> On Mon, Mar 27, 2017 at 7:28 AM, Stano Lano <chl.xxx5x at gmail.com> wrote:
>>
>> Hello,
>>
>> did you have any luck with the ASUS support.
>> I should have the same ASUS Prime X370-Pro.
>> But when I enable IOMMU I am not able to boot, when the IOMMU is disable I
>> have no problem to boot.
>>
>> I am on BIOS 0511 and kernel 4.10.5
>> Tried with 0502, 0504 & 0511 BIOSes but no luck with any of them.
>> Also tried with Fedora 25, 25 beta & Ubuntu 17.04 beta. Same behavior.
>>
>> Thanks
>> Stano
>>
>> ________________________________
>>
>> From: Nick Sarnie <commendsarnex gmail com>
>> To: Alex Williamson <alex l williamson gmail com>
>> Cc: vfio-users <vfio-users redhat com>
>> Subject: Re: [vfio-users] Ryzen/X370 Chipset and IOMMU Groups
>> Date: Fri, 10 Mar 2017 13:53:26 -0500
>>
>>
>> Yeah, that is unfortunate.
>>
>> Thanks for helping with this issue. I've sent a ticket to Asus, but I'm
>> not expecting much. Then again, I felt the same way and Gigabyte actually
>> sent me a fixed bios, so who knows.
>>
>> I'll keep you updated.
>>
>> Thanks again,
>> Sarnex
>>
>> On Fri, Mar 10, 2017 at 1:37 PM, Alex Williamson <alex l williamson gmail
>> com> wrote:
>>>
>>> On Fri, Mar 10, 2017 at 11:05 AM, Nick Sarnie <commendsarnex gmail com>
>>> wrote:
>>>>
>>>> Hi Alex,
>>>>
>>>> I don't see either of the options. I couldn't find Common Options at
>>>> all, and here's a screenshot of the CBS settings:
>>>>
>>>> https://i.imgur.com/9hQUHX0.jpg
>>>>
>>>> Is this something I should ask Asus to add?
>>>
>>>
>>> I suppose it wouldn't hurt to try to start the discussion with Asus.  The
>>> video I found was this one:
>>>
>>> https://youtu.be/pipR5xhrLo0?t=20
>>>
>>> At that start time you can see an NBIO Common Options menu on an ASRock
>>> system, but I never saw him open it and I couldn't find any documentation on
>>> what might be in there in an asrock mb manual (not an endorsement for
>>> asrock, perhaps they just have a BIOS more similar to the AMD sample
>>> implementation).  If AMD put it into a menu of debug options, it's really no
>>> surprise that consumer firmware dropped it.  Too bad.  This feels like a
>>> repeat of the difficulty we had trying to find motherboards that allowed the
>>> IOMMU to be enabled when AMD-Vi came out.  I wonder if AVIC requires yet
>>> another BIOS option that consumers will need to gamble with.
>
>
>
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-- 
-Steven Walter <stevenrwalter at gmail.com>