Introducing support for AMD Secure Nested Paging (SNP) with IOMMU, which mainly affects the use of IOMMU Exclusion Base and Range Limit registers. Note that these registers are no longer used by Linux IOMMU driver. Patch 2 and 3 are SNP-specific, and discuss detail of the implementation.
In order to support SNP, the current Completion Wait Write-back logic is modified (patch 1/4). This change is independent from SNP. Please see the following white paper for more info on SNP: https://www.amd.com/system/files/TechDocs/SEV-SNP-strengthening-vm-isolation-with-integrity-protection-and-more.pdf Changes from V1: (https://lkml.org/lkml/2020/9/16/455) - Patch 2/3: Fix up per Joerg's comments Thank you, Suravee Suravee Suthikulpanit (3): iommu: amd: Use 4K page for completion wait write-back semaphore iommu: amd: Add support for RMP_PAGE_FAULT and RMP_HW_ERR iommu: amd: Re-purpose Exclusion range registers to support SNP CWWB drivers/iommu/amd/amd_iommu_types.h | 6 +- drivers/iommu/amd/init.c | 44 ++++++++++++++ drivers/iommu/amd/iommu.c | 90 +++++++++++++++++++++++++---- 3 files changed, 127 insertions(+), 13 deletions(-) -- 2.17.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
