I wonder if that commit just unmasked another issue.
When testing on Mandolin the IVRS table out of the HOB written by AGESA/FSP was so broken that the kernel (the version that is used in the live boot media of kubuntu 18.04 LTS; haven't checked which) just disabled the IOMMU altogether. The IVRS table generated by coreboot fixed at least that issue, so reverting it would cause a regression there.

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