Bug 203957 - AGESA 0.0.7.2. based BIOS update broke IOMMU redirection
Summary: AGESA 0.0.7.2. based BIOS update broke IOMMU redirection
Status: NEW
Alias: None
Product: Virtualization
Classification: Unclassified
Component: kvm (show other bugs)
Hardware: x86-64 Linux
: P1 normal
Assignee: virtualization_kvm
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-06-23 00:22 UTC by anjan
Modified: 2019-06-23 00:23 UTC (History)
1 user (show)

See Also:
Kernel Version: 5.1.12
Subsystem:
Regression: No
Bisected commit-id:

Attachments
pci patch that fixes pci passthrough for newer AMD Bios (1.77 KB, patch)
2019-06-23 00:22 UTC, anjan 		Details | Diff
Add an attachment (proposed patch, testcase, etc.)

Description anjan 2019-06-23 00:22:56 UTC 
Created attachment 283395 [details]
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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