On Thu, Nov 28, 2019 at 12:42:25AM +0000, Ashish Kalra wrote: > Why can't we leverage CMA instead of SWIOTLB for DMA when SEV is > enabled, CMA is well integerated with the DMA subsystem and handles > encrypted pages when force_dma_unencrypted() returns TRUE. > > Though, CMA might face the same issues as SWIOTLB bounce buffers, it's > size is similarly setup statically as SWIOTLB does or can be set as a > percentage of the available system memory. How is CMA integrated with SEV? CMA just gives a contiguous chunk of memory, which still needs to be remapped as unencrypted before returning it to the user.
