Description
4.20.1+ kernel with add-acs-overrides patch from Arch AUR:
NOTE: 5.1.7 -> 5.3.x also contains this patch: https://forum.manjaro.org/t/solved-agesa-0-0-7-2-based-bios-update-broke-iommu-redirection/88909/9
Installation Instructions
1 Enable the repository:
dnf copr enable parndt/kernel-acspatch
2 Add pci_acs_override= to GRUB_CMDLINE_LINUX as necessary in /etc/sysconfig/grub
pci_acs_override notes
pcie_acs_override =
[PCIE] Override missing PCIe ACS support for:
downstream
All downstream ports - full ACS capabilties
multifunction
All multifunction devices - multifunction ACS subset
id:nnnn:nnnn
Specfic device - full ACS capabilities
Specified as vid:did (vendor/device ID) in hex
Here is my full GRUB_CMDLINE_LINUX in /etc/sysconfig/grub for reference:
GRUB_CMDLINE_LINUX="rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap rhgb quiet iommu=pt amd_iommu=on pcie_acs_override=downstream,multifunction,id:1022:43c7 rd.driver.pre=vfio-pci pci=noaer"
I specify many (and possibly redundant) options for pci_acs_override (downstream,multifunction,id=1022:43c7) - not all of them may be necessary. Setting pcie_acs_override=downstream alone may be sufficient.
If using id=, you should provide the ID for the PCI-e bridge device connected to the PCI-e device you want in another IOMMU group. In my example above, I provide the ID for the PCI-e bridge connected to my third GPU so that it is assigned a new IOMMU group and can be passed to a VM (VFIO):
3 Install the updated kernel:
dnf update kernel --refresh
Active Releases
The following unofficial repositories are provided as-is by owner of this project. Contact the owner directly for bugs or issues (IE: not bugzilla).
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