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

[Alex Williamson]

On Fri, Mar 10, 2017 at 11:05 AM, Nick Sarnie <commendsarnex at 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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