On Tue, Jul 05, 2022 at 07:56:11PM +0200, LABBE Corentin wrote: > My problem is that a dma_sync on the data buffer corrupt the poison buffer as collateral dommage. > Probably because the sync operate on a larger region than the requested dma_sync length. > So I try to flush poison data in the cryptoAPI. Data structures that are DMAed to must be aligned to the value returned by dma_get_cache_alignment(), as non-coherent DMA by definition can disturb the data inside that boundary. That is not a bug but fundamentally part of how DMA works when the device attachment is not cache coherent.
