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


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.


Let me know if you see anything,


On Thu, Mar 9, 2017 at 9:17 AM, Alex Williamson <alex l williamson gmail com> wrote:
On Thu, Mar 9, 2017 at 12:33 AM, Nick Sarnie <commendsarnex 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,


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