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

[Nick Sarnie]

Hi,

You previously helped me with an issue on Z170 with the bios preventing the
quirk from kicking in on the root ports, and Gigabyte fixed the bios for
me. I must have thought that was more general.

Anyway, here's the correct lspci.

https://paste.pound-python.org/show/CgR8EioN3hZoVsp7KYrF/

Let me know if you see anything,

Thanks

On Thu, Mar 9, 2017 at 9:17 AM, Alex Williamson <alex.l.williamson at gmail.com
> wrote:

> On Thu, Mar 9, 2017 at 12:33 AM, Nick Sarnie <commendsarnex at gmail.com>
> wrote:
>
>> I expect Alex to find it's a BIOS bug. Also, the ACS patch does allow the
>> groups to be made separating the GPUs(Wendell reported it didn't work), but
>> I haven't gotten around to testing actual passthrough to see if there's
>> some other issue(Maybe this is what he meant). I'll report if it works
>> tomorrow.
>>
>
> What evidence do you have to suggest a BIOS bug?  ACS is a hardware
> feature, so the only way I can imagine a BIOS bug being a factor is if the
> BIOS has some ability to disable it by dropping it from the capability
> chain.  If you add one more 'x' to make it lspci -xxxx then we can see the
> raw dump of the extended capability space, though ACS is a tiny capability,
> it might be impossible to positively identify it if the capability ID is
> masked.  My guess is that it's either an oversight or marketing distinction
> reserved for their server lines (we'll see once those ship), and that maybe
> we can work with them to create quirks to expose isolation if it exists.
> I've already started reaching out to AMD for this.  Thanks,
>
> Alex
>
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