On Thu, 15 Oct 2026 at 18:15, David Marchand <[email protected]> wrote: > > 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]>
Applied, thanks. -- David Marchand
