Gigabyte X399 Aorus Xtreme IOMMU Mapping

[RBE]

Is there a simple way to determine the mapping between a physical location on a motherboard (PCIe slot, M.2 connector etc.) and the corresponding IOMMU entry?

I have a Gigabyte X399 Aorus Xtreme motherboard which I have not yet populated, and have been looking at an old post that lists the IOMMU groups, trying to figure out what entry corresponds to what physical location:

IOMMU Groups for Gigabyte Aorus x399 Xtreme

Posting the IOMMU Groups for the Aorus x399 Xtreme that might be helpful for people looking for a motherboard and searching for proper IOMMU. IOMMU Group 0 00:01.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe Dummy Host Bridge [1022:1452] IOMMU Group 0 00:01.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe GPP Bridge [1022:1453] IOMMU Group 0 00:01.2 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe GPP Bridge [1022:1453] IOMMU Group 0 01:00.0 USB controller [0c03]: Advanced Micro Devices, Inc. [AMD] X399 Series Chipset USB 3.1 xHCI Controller [1022:43ba] (rev 02) IOMMU Group 0 01:00.1 SATA controller [0106]: Advanced Micro Devices, Inc. [AMD] X399 Series Chipset SATA Controller [1022:43b6] (rev 02) IOMMU Group 0 01:00.2 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] X399 Series Chipset PCIe Bridge [1022:43b1] (rev 02) IOMMU Group 0 02:00.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port [1022:43b4] (rev 02) IOMMU Group 0 02:01.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port [1022:43b4] (rev 02) IOMMU Group 0 02:02.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port [1022:43b4] (rev 02) IOMMU Group 0 02:03.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port [1022:43b4] (rev 02) IOMMU Group 0 02:04.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port [1022:43b4] (rev 02) IOMMU Group 0 02:09.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] 300 Series Chipset PCIe Port [1022:43b4] (rev 02) IOMMU Group 0 03:00.0 Ethernet controller [0200]: Intel Corporation I210 Gigabit Network Connection [8086:1533] (rev 03) IOMMU Group 0 04:00.0 Network controller [0280]: Intel Corporation Wireless 8265 / 8275 [8086:24fd] (rev 78) IOMMU Group 0 05:00.0 Ethernet controlle…

As @dstegos states in his post, one of the PCIe slots and one of the NVMe slots are in IOMMU group 0. The question is, which PCIe / NVMe slots are these?

One solution would be to populate the motherboard with all of the GPUs and NVMe drives I intend to use, and boot from a live image to determine the IOMMU group mapping (if the live image supports this).

Is there a better way?

[gordonthree]

@RBE

boot from a live image to determine the IOMMU group mapping (if the live image supports this).

While you’re in there, run lstopo too and grab the graphic it makes.

Any live disc that lets you edit the boot parameters will support iommu since it’s part of the kernel. Just add the kernel command line options for your platform.

[berti]

See the snippet after “You can get more information on the devices inside the IOMMU groups using this command line script” in this aricle. (Sorry, the damn forum softwar won’t let me post the code.)