On Thu, 15 Oct 2026 at 17:44, Anatoly Burakov <[email protected]> wrote: > > Currently, when the `enable_unsafe_noiommu_mode` VFIO module parameter is > set, VFIO selects PA IOVA mode and then only looks for no-IOMMU device > nodes: `/dev/vfio/noiommu-N` in group mode, and `noiommu-vfioN` in cdev > mode. > > However, the parameter does not make every VFIO device a no-IOMMU > device. The kernel only creates a no-IOMMU group for a device that has no > IOMMU group of its own; devices behind a real IOMMU still get a regular > `/dev/vfio/N` group and `vfioN` cdev. On such systems, devices bound > to `vfio-pci` are therefore reported as not managed by VFIO and fail > to probe. > > Fix it by trying the regular node name first and falling back to the > no-IOMMU one, in both group and cdev modes. > > Fixes: 6cb38a7f56e0 ("vfio: introduce VFIO mode") > Fixes: d129414711aa ("vfio: introduce cdev mode") > > Signed-off-by: Anatoly Burakov <[email protected]>
Acked-by: David Marchand <[email protected]> -- David Marchand
