That is odd, and if that was the problem, I guess the others should have errored out with it.
It appears that AMD-V might also be called SVM mode, which you probably came across, and is probably already set.
it seems some people used
dmesg | grep “AMD-V”
to check for iommu groups, which came up with a bunch of iommu lines. If you have lines like it, then I’d say it must be enabled, and that tree is the wrong one to bark at?
(I had to ctl-f to find then AMD-V bit, which had a bunch of AMD-Vi listings in the OP’s section. I understand this link is for QEMU, but that one check should be agnostic VFIO in 2020 Fedora 32 - An alternate route )