On Tue, 30 Jan 2018 12:02:32 +0100 Oliver Heid <oliver.h...@h-next.de> wrote:
> Hi, > I want to user VFIO for direct streaming between user space and a PCIe > device (FPGA). Device isolation works, but how do I re-assign the PCIe > BARs to my user space memory and handle the IOMMU TLB remapping? Or is > there some other/better way to do that? https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/vfio.txt PCI BARs are exposed as regions within the device file descriptor, you can read/write to them via the file descriptor or mmap them into the user address space where supported. DMA is configured via ioctls on the container, mapping a user virtual address to an IOVA. Note that some IOMMUs do not support a full 64bit IOVA space, so don't expect to be able to identity map the IOVA to the virtual address. We're working on an API to expose to the IOVA ranges to userspace. Thanks, Alex _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
