On Thu, 10 Nov 2016 12:16:19 +0100 Lars Segerlund <[email protected]> wrote:
> Hi, > > I am getting these errors from a userspace 'device driver' , > > [599805.585424] DMAR: DRHD: handling fault status reg 202 > [599805.585431] DMAR: DMAR:[DMA Read] Request device [03:00.0] fault addr > 4c0008000 > DMAR:[fault reason 06] PTE Read access is not set > > Basicly i mapp a dma engine in a PCIe card by uio to a userspace library, > and then allocate hugepages ( continous ), do a virt to phys translation > via /proc/self/.... setup a dma and turn it on. > > The message tells me I lack iommu mappings for the memory regions i try to > read/write , so far so good nothing unexpected. > > My problem is that I have to run with intel_iommu=on iommu=pt flags to the > kernel due to other hard/software on the machine, I can't turn iommu off > completely. > > So I have the question is it possible to add iommu mappings from userspace > ? through iommu groups in /sys/.. ? > > So far all applications that does something similar either uses vfio or > some kernel driver callback and I would prefer not to do this. > ( I had high hopes for dpdk pmd driver but so far no luck ). vfio is the right way to do this. _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
