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Microserver Gen8 "Device is ineligible for IOMMU domain attach due to platform RMRR requirement"

Bonobo
Occasional Visitor

Microserver Gen8 "Device is ineligible for IOMMU domain attach due to platform RMRR requirement"

I get the error in the title upon attempting to use pcie passthrough on the microserver g8 with Proxmox hypervisor(basically any linux kernel will get this error since version 3.16). I replaced the CPU with a xeon 1265l so vt-d is enabled.

The following article describes my problem perfectly: https://h20565.www2.hpe.com/hpsc/doc/public/display?sp4ts.oid=7271259&docId=emr_na-c04781229&docLocale=en_US

I tried the solution in that article successfully but the error persists. Did any even get that to work at all? Ever?