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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 <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
This commit is contained in:
David Rientjes authored and Christoph Hellwig committed 2020-04-25 13:17:06 +02:00
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commit 82fef0ad81
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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