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Re: [vfio-users] Ryzen/X370 Chipset and IOMMU Groups



On 03/09/2017 12:30 AM, Nick Sarnie wrote:

Hi all,
My Ryzen stuff finally arrived, so I can help get GPU Passthrough working.
My CPU is the 1800X and my motherboard is the Asus Prime X370-Pro.

I'm on kernel 4.10.1.

The IOMMU groups are indeed bad:
https://paste.pound-python.org/show/LGsNqdfIO3xWNNv9Mslr/

As you can see, the graphics cards are grouped together.

Alex, I've linked lspci -xxx -vvv and dmesg below. Please let me know if
you see anything, or need any more information.

lspci: https://paste.pound-python.org/show/iOgBaLrDZEGefuJjZlgy/

dmesg: https://paste.pound-python.org/show/3eevItiXBhgCjwDXVxQX/


Thanks,
Sarnex



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I hope this is just a bug and that AMD isn't going the intel route with making ACS a "server" feature.

In comparison, my bulldozer rig with a SR5690 chipset where there is a turkey for every pot.

/sys/kernel/iommu_groups/
/sys/kernel/iommu_groups/7
/sys/kernel/iommu_groups/7/devices
/sys/kernel/iommu_groups/7/devices/0000:00:14.4 (7 is a pci bridge and onboard pci device)
/sys/kernel/iommu_groups/7/devices/0000:08:01.0
/sys/kernel/iommu_groups/5
/sys/kernel/iommu_groups/5/devices
/sys/kernel/iommu_groups/5/devices/0000:00:14.2
/sys/kernel/iommu_groups/3
/sys/kernel/iommu_groups/3/devices
/sys/kernel/iommu_groups/3/devices/0000:00:14.0
/sys/kernel/iommu_groups/11
/sys/kernel/iommu_groups/11/devices
/sys/kernel/iommu_groups/11/devices/0000:04:00.0
/sys/kernel/iommu_groups/1
/sys/kernel/iommu_groups/1/devices
/sys/kernel/iommu_groups/1/devices/0000:00:12.2 (usb controller set)
/sys/kernel/iommu_groups/1/devices/0000:00:12.0
/sys/kernel/iommu_groups/1/devices/0000:00:12.1
/sys/kernel/iommu_groups/8
/sys/kernel/iommu_groups/8/devices
/sys/kernel/iommu_groups/8/devices/0000:00:14.5
/sys/kernel/iommu_groups/6
/sys/kernel/iommu_groups/6/devices
/sys/kernel/iommu_groups/6/devices/0000:00:14.3
/sys/kernel/iommu_groups/4
/sys/kernel/iommu_groups/4/devices
/sys/kernel/iommu_groups/4/devices/0000:00:14.1
/sys/kernel/iommu_groups/12
/sys/kernel/iommu_groups/12/devices
/sys/kernel/iommu_groups/12/devices/0000:05:00.0 (video card and audio device)
/sys/kernel/iommu_groups/12/devices/0000:05:00.1
/sys/kernel/iommu_groups/2
/sys/kernel/iommu_groups/2/devices
/sys/kernel/iommu_groups/2/devices/0000:00:13.1 (other usb controller set)
/sys/kernel/iommu_groups/2/devices/0000:00:13.2
/sys/kernel/iommu_groups/2/devices/0000:00:13.0
/sys/kernel/iommu_groups/10
/sys/kernel/iommu_groups/10/devices
/sys/kernel/iommu_groups/10/devices/0000:03:00.0
/sys/kernel/iommu_groups/0
/sys/kernel/iommu_groups/0/devices
/sys/kernel/iommu_groups/0/devices/0000:00:11.0
/sys/kernel/iommu_groups/9
/sys/kernel/iommu_groups/9/devices
/sys/kernel/iommu_groups/9/devices/0000:01:00.0


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