On 1/18/2017 12:27 PM, Alejandro Lucero wrote: > For using a DPDK app when iommu is enabled, it requires to > add iommu=pt to the kernel command line. But using igb_uio driver > makes DMAR errors because the device has not an IOMMU domain. > > Since kernel 3.15, iommu=pt requires to use the internal kernel > DMA API for attaching the device to the IOMMU 1:1 mapping, aka > si_domain. Previous versions did attach the device to that > domain when intel iommu notifier was called. > > This is not a problem if the driver does later some call to the > DMA API because the mapping can be done then. But DPDK apps do > not use that DMA API at all. > > Doing this dma map and unmap is harmless even when iommu is not > enabled at all. > > Signed-off-by: Alejandro Lucero <[email protected]>
Acked-by: Ferruh Yigit <[email protected]> (I suggest getting this early in 17.05 release, so it can be tested more)
