[Xen-users] AMD-Vi: Error initialization

[Norbert Irmer <nirmer0@xxxxxxxxxxxxxx>]

I have a problem.

When running xen-4.12.2 on fedora 31 with kernel 5.4.18-200.fc31.x86_64, 
AMD-Vi initialization fails, so I can't passthrough pci devices to vms.
I am reporting this, because, when I boot fedora 31 without the xen 
hypervisor, AMD-Vi works, and I can passthrough devices using the 
Qemu/KVM stack, so I guess, this error is caused by xen amd_iommu not 
supporting my AMD Ryzen Threadripper 3960X 24-Core Processor/TRX40 AORUS 
XTREME cpu/mobo combo, and not by a bogus BIOS.
I attached the output of xl dmesg, I think the relevant lines are:

(XEN) IVHD Error: Invalid IO-APIC 0x80
(XEN) AMD-Vi: Error initialization
(XEN) I/O virtualisation disabled

To show, that IOMMU is principally working, here is the output of "dmesg 
-T | grep -i iommu" when booting without xen:
...

[So Feb 16 17:29:03 2020] pci 0000:61:00.0: Adding to iommu group 76
[So Feb 16 17:29:03 2020] pci 0000:62:00.0: Adding to iommu group 77
[So Feb 16 17:29:03 2020] pci 0000:60:00.2: AMD-Vi: Found IOMMU cap 0x40
[So Feb 16 17:29:03 2020] pci 0000:40:00.2: AMD-Vi: Found IOMMU cap 0x40
[So Feb 16 17:29:03 2020] pci 0000:20:00.2: AMD-Vi: Found IOMMU cap 0x40
[So Feb 16 17:29:03 2020] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[So Feb 16 17:29:03 2020] perf/amd_iommu: Detected AMD IOMMU #0 (2 
banks, 4 counters/bank).
[So Feb 16 17:29:03 2020] perf/amd_iommu: Detected AMD IOMMU #1 (2 
banks, 4 counters/bank).
[So Feb 16 17:29:03 2020] perf/amd_iommu: Detected AMD IOMMU #2 (2 
banks, 4 counters/bank).
[So Feb 16 17:29:03 2020] perf/amd_iommu: Detected AMD IOMMU #3 (2 
banks, 4 counters/bank).
[So Feb 16 17:29:06 2020] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel 
<jroedel@xxxxxxx>
I also attached the output of "lshw -short".

Any help would be appreciated, thanks.

Attachment: lshw-short.txt
Description: Text document

Attachment: iommu-ok.txt
Description: Text document

Attachment: iommu-failed-xen.txt
Description: Text document

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