After upgrading to Proxmox kernel 6.8.12-29-pve-signed, PCIe IOMMU group separation for AMD 400-series chipset (MSI GAMING PLUS x470) devices regressed.
Devices previously isolated into separate IOMMU groups are now grouped into a single group despite ACS override flags.
Reverting to kernel 6.8.12-22-pve restores expected grouping behavior.
Devices previously isolated into separate IOMMU groups are now grouped into a single group despite ACS override flags.
Reverting to kernel 6.8.12-22-pve restores expected grouping behavior.