09/07/2019 17:02, Burakov, Anatoly: > When IOMMU is fully enabled (iommu=on at boot time), igb_uio will simply > not work. VFIO will work, whichever address mode you use. > > When IOMMU is in pass-through mode (iommu=pt at boot time), both igb_uio > and VFIO will work, although igb_uio will only support IOVA as PA mode. > Both modes will enable IOMMU, and both can run in IOVA as PA mode > without losing that protection. > > It's only when IOMMU is off, igb_uio will not engage IOMMU, and VFIO > will only work in no-IOMMU mode (thus not engaging IOMMU either), and > only then you lack the IOMMU protection.
Could we try to make IOMMU status clear in DPDK logs? Then we could check the kernel drivers loaded and give a compatibility status for each of them as debug logs.
