Claudia:
> I'm getting this message in my logs, about an IOMMU error, on both 4.0.2 and 
> the F31-based 4.1 build. I'm as certain as I can be that the IOMMU is enabled 
> in BIOS. I'm having issues with passthru and I'm wondering if this might be 
> the cause. 

> https://bugzilla.redhat.com/show_bug.cgi?id=1404139
> This thread says it's not a bug, it's just because the system doesn't support 
> IOMMUv2 and amdkfd (whatever that is) requires IOMMUv2 (whatever that is) for 
> HSA (whatever that is). I don't really know what any of that means. 

> Or does it just mean that my GPU is not protected by the IOMMU (same as 
> iommu=no-igfx on Intel) and I don't have to worry about it?

I saw in a different thread you made progress, so this is probably
outdated. However, I think your conclusions are correct. If your IOMMU
was not working correctly, you would have problems starting HVMs period.
The Xen logs look similar to mine. I don't have kfd on my system.

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