dma-direct: make dma_direct_map_phys() honor DMA_ATTR_CC_SHARED

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Teach dma_direct_map_phys() to select the DMA address encoding based on
DMA_ATTR_CC_SHARED.

Use phys_to_dma_unencrypted() for decrypted mappings and
phys_to_dma_encrypted() otherwise. If a device requires unencrypted DMA
but the source physical address is still encrypted, force the mapping
through swiotlb so the DMA address and backing memory attributes remain
consistent.

Update the arm64, x86, s390 and powerpc secure-guest setup to not use
swiotlb force option

Tested-by: Jiri Pirko <jiri@nvidia.com>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Tested-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
Link: https://lore.kernel.org/r/20260717180442.110954-18-aneesh.kumar@kernel.org
[mszyprow: rebased onto latest changes in arch/arm64/mm/init.c]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

...

This commit is contained in:

Aneesh Kumar K.V (Arm) 2026-07-17 23:34:35 +05:30 • committed by Marek Szyprowski

parent b4f38ddd79

commit 30c5e45ee2

5 changed files with 34 additions and 30 deletions

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4

arch/arm64/mm/init.c

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2

arch/powerpc/platforms/pseries/svm.c

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2

arch/s390/mm/init.c

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4

arch/x86/kernel/pci-dma.c

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58

kernel/dma/direct.c

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