Messages in this thread Patch in this message | | | Date | Wed, 8 Apr 2020 14:21:10 -0700 (PDT) | From | David Rientjes <> | Subject | [rfc v2 5/6] 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> --- arch/x86/Kconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 8d078642b4be..b7c9e78a5374 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -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
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