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Firstly here is my hardware:

  • MB: GIGABYTE GA-X58A-UD9
  • CPU: Intel Core i7 CPU X 980 @ 12x 3.326GHz
  • GFX: AMD HD 6950, nVidia GTX 570(will be passthrough device)

I have followed the direction of various guides and was able to blog the nVidia device using pci_stub. In the GRUB config, I enable "iommu=on" and after restarting and making sure Virtualization was enabled in BIOS.

Upon restart I entered the command:

dmesg | grep -e DMAR -e IOMMU

For which I got the reply

[     0.000000] Intel-IOMMUL enabled

and nothing else. I thought it was working but when I check for iommu_groups using

find /sys/kernel/iommu_groups/ -type l

It returned absolutely nothing. Can anyone help me troubleshoot as I have no idea what else to do.

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If you're using an Intel processor I believe what you want your boot commandline to contain

intel_iommu=on

If you do this successfully you should see it in /proc/cmdline. For more details on seeing this up see Alex Williamson's blog.

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