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pKVM does support memory encryption, expose that to the rest of the kernel through cc_platform_has() At the moment, all devices inside the guest are emulated which requires its memory to be shared back to the host (decrypted), so set force_dma_unencrypted() to always return true. Although, typically pKVM guests rely on restricted-dma-pools to bounce traffic, with this change, it is possible to solely rely on the default SWIOTLB for that (assuming the appropriate size is set from the command line) Signed-off-by: Mostafa Saleh <smostafa@google.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org> Signed-off-by: Will Deacon <will@kernel.org>