On Fri, Aug 16, 2019 at 11:40:43PM +0100, Julien Grall wrote:
I am not sure I agree with this rename. The implementation of the helpers
are very Arm specific as this is assuming Dom0 is 1:1 mapped.
This was necessary due to the lack of IOMMU on Arm platforms back then.
But this is now a pain to get rid of it on newer platform...
So if you look at the final version of the header after the whole
series, what assumes a 1:1 mapping? It all just is
local cache sync;
call into the arch code;
Moving xen_dma_* routines into the arch would be a good option. Although, I would still consider a stub version for arch not requiring specific DMA.
are you concerned that the local cache sync might have to be split
up more for a non-1:1 map in that case? We could just movea
the xen_dma_* routines into the arch instead of __xen_dma, but it
really helps to have a common interface header.