New: AGESA 0.0.7.2. based BIOS update broke IOMMU redirection

https://bugzilla.kernel.org/show_bug.cgi?id=203957

            Bug ID: 203957
           Summary: AGESA 0.0.7.2. based BIOS update broke IOMMU
                    redirection
           Product: Virtualization
           Version: unspecified
    Kernel Version: 5.1.12
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

Created attachment 283395
--> https://bugzilla.kernel.org/attachment.cgi?id=283395&action=edit
pci patch that fixes pci passthrough for newer AMD Bios

Hello,

I am using a "AMD Ryzen 7 1700" on a "GA-AX370-Gaming 5". I recently updated to the latest BIOS from an older BIOS. Updating my bios broke PCI passthrough.

Everytime I would try to start my virtual machine from virt-manager, I would get "Unknown PCI header type '127'" and my virtual machines would refuse to boot.

It seems this is a common issue:
1.
https://forum.manjaro.org/t/solved-agesa-0-0-7-2-based-bios-update-broke-iommu-redirection/88909

2. https://www.reddit.com/r/Amd/comments/bh3qqz/agesa_0072_pci_quirk/

However, following the solution in thread 1, I was able to fix pci passthrough.

I simply applied this patch:
https://clbin.com/VCiYJ

to kernel 5.1.12 and it fixed PCI passthrough. This patch is also attached to this bug as a mirror.

It would be great if this patch could get merged into upstream. Please let me know if I can provide any further information or assist in any way to make this happen.

Thank you.

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