Excerpts from David Rientjes's message of June 11, 2020 3:25 am:
DMA_REMAP is an unnecessary requirement for AMD SEV, which requires DMA_COHERENT_POOL, so avoid selecting it when it is otherwise unnecessary.
The only other requirement for DMA coherent pools is DMA_DIRECT_REMAP, so ensure that properly selects the config option when needed.
Fixes: 82fef0ad811f ("x86/mm: unencrypted non-blocking DMA allocations use coherent pools") Suggested-by: Christoph Hellwig hch@lst.de Signed-off-by: David Rientjes rientjes@google.com
kernel/dma/Kconfig | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
Works for me with SME on or off with af7b480103, and with SME off in abfbb29297. There is some regression with amdgpu and SME between those two points, I need to check that out too. I haven't tested either before or after with SEV (which I'm not even sure my system supports). Regardless, this is a definite improvement.
Tested-by: Alex Xu (Hello71) alex_y_xu@yahoo.ca
Thanks, Alex.