[AMD Official Use Only - Internal Distribution Only] + Felix ________________________________ From: Joerg Roedel <[email protected]> Sent: Monday, August 24, 2020 6:54 AM To: [email protected] <[email protected]> Cc: Joerg Roedel <[email protected]>; [email protected] <[email protected]>; Lendacky, Thomas <[email protected]>; Suthikulpanit, Suravee <[email protected]>; Deucher, Alexander <[email protected]>; [email protected] <[email protected]> Subject: [PATCH 0/2] iommu/amd: Fix IOMMUv2 devices when SME is active
From: Joerg Roedel <[email protected]> Hi, Some IOMMUv2 capable devices do not work correctly when SME is active, because their DMA mask does not include the encryption bit, so that they can not DMA to encrypted memory directly. The IOMMU can jump in here, but the AMD IOMMU driver puts IOMMUv2 capable devices into an identity mapped domain. Fix that by not forcing an identity mapped domain on devices when SME is active and forbid using their IOMMUv2 functionality. Please review. Thanks, Joerg Joerg Roedel (2): iommu/amd: Do not force direct mapping when SME is active iommu/amd: Do not use IOMMUv2 functionality when SME is active drivers/iommu/amd/iommu.c | 7 ++++++- drivers/iommu/amd/iommu_v2.c | 7 +++++++ 2 files changed, 13 insertions(+), 1 deletion(-) -- 2.28.0
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