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x86/mm: unencrypted non-blocking DMA allocations use coherent pools

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When CONFIG_AMD_MEM_ENCRYPT is enabled and a device requires unencrypted
DMA, all non-blocking allocations must originate from the atomic DMA
coherent pools.

Select CONFIG_DMA_COHERENT_POOL for CONFIG_AMD_MEM_ENCRYPT.

Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
David Rientjes 2020-04-14 17:05:01 -07:00 committed by Christoph Hellwig
parent 2edc5bb3c5
commit 82fef0ad81
1 changed files with 1 additions and 0 deletions
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arch/x86/Kconfig
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@ -1520,6 +1520,7 @@ config X86_CPA_STATISTICS
config AMD_MEM_ENCRYPT
bool "AMD Secure Memory Encryption (SME) support"
depends on X86_64 && CPU_SUP_AMD
select DMA_COHERENT_POOL
select DYNAMIC_PHYSICAL_MASK
select ARCH_USE_MEMREMAP_PROT
select ARCH_HAS_FORCE_DMA_UNENCRYPTED