Source: linux Version: 6.12.38 Severity: important Tags: upstream X-Debbugs-Cc: [email protected]
Trixie 13.0 installer contains kernel version v6.12.38. This contains a bug that breaks PCI passthrough (vfio) for VM guests. Symptoms will depend on what is passed through. On reboot into a Trixe VM that relies on passthrough it may fail in many ways: For GPUs the (PCI) gpu driver will fail to initialise the device For storage devices and/or host bus adapters, they will fail to initialise. If root file-system is on the storage device boot will fail, dropping into the initialramfs shell reporting "root device X not found". For network devices there will be no interfaces. Similar for USB and any other device passed through. If the VM guest is using virtIO then many expected functions such as keyboard may not work. The problem was a backported commit in v6.12.35 that had one hunk applied in the wrong function. That is: fb5873b779dd "iommu/vt-d: Restore context entry setup order for aliased devices" The fix in v6.12.40 is: ff7ccaadb0bf "iommu/vt-d: Fix misplaced domain_attached assignment"
