On Tue, Sep 27, 2022 at 06:33:48PM +0200, Niklas Schnelle wrote: > Not sure what the non-MSI reservation is for? It does seem like x86_64 > also uses this for quite large ranges. There are lots of things that are unsuitable for DMA on x86 platforms, unfortunately.. But yeah, I'm not sure either. > This is because I'm getting a map request for an IOVA in the reserved > region. How come? iova_reserve_iommu_regions() reads the reserved regions and loads them as reserved into the iovad which should cause iommu_dma_alloc_iova() and alloc_iova_fast() to not return values in those ranges. It all looks like it is supposed to work Did something go wrong in the initialization order perhaps? Jason
