I'm trying to get GPU passthrough to work, but haven't gotten very far. I'm
losing my mind trying to figure out what could be the problem. I'm working with
a 5820k and an ASUS X99-A II, both of which support IOMMU. I enabled VT-d in
the UEFI settings and added intel_iommu=on to GRUB.
I restart, and when I cat /proc/cmdline I can see the option is there there but
it had no effect. There's nothing under /sys/kernel/iommu_groups, there is no
iommu_group folder under /sys/bus/pci/devices/MYBUS/, and when I grep dmesg I
get a generic "DMAR: IOMMU enabled" messages and a warning that I don't have
AMD IOMMUv2 functionality but that's it.
dmesg contents: http://ptpb.pw/ZpcL
Any ideas what I'm missing?
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