On Tue, Aug 06, 2019 at 03:59:40PM +0000, Lendacky, Thomas wrote: > As long as two different cookie types (page pointer for encrypted DMA > and virtual address returned from page_address() for unencrypted DMA) > is ok. I'm just not familiar with how the cookie is used in any other > functions, if at all.
DMA_ATTR_NO_KERNEL_MAPPING is intended for memory never used in the kernel, either because it is just a buffer for device that are too cheap to enough dram, or because it is a buffer for userspace to device communication that the kernel just mediates. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
