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iommufd: Introduce data struct for AMD nested domain allocation

Introduce IOMMU_HWPT_DATA_AMD_GUEST data type for IOMMU guest page table,
which is used for stage-1 in nested translation. The data structure
contains information necessary for setting up the AMD HW-vIOMMU support.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

authored by

Suravee Suthikulpanit and committed by
Joerg Roedel e05698c1 9b467a5a

+11
+11
include/uapi/linux/iommufd.h
··· 466 466 }; 467 467 468 468 /** 469 + * struct iommu_hwpt_amd_guest - AMD IOMMU guest I/O page table data 470 + * (IOMMU_HWPT_DATA_AMD_GUEST) 471 + * @dte: Guest Device Table Entry (DTE) 472 + */ 473 + struct iommu_hwpt_amd_guest { 474 + __aligned_u64 dte[4]; 475 + }; 476 + 477 + /** 469 478 * enum iommu_hwpt_data_type - IOMMU HWPT Data Type 470 479 * @IOMMU_HWPT_DATA_NONE: no data 471 480 * @IOMMU_HWPT_DATA_VTD_S1: Intel VT-d stage-1 page table 472 481 * @IOMMU_HWPT_DATA_ARM_SMMUV3: ARM SMMUv3 Context Descriptor Table 482 + * @IOMMU_HWPT_DATA_AMD_GUEST: AMD IOMMU guest page table 473 483 */ 474 484 enum iommu_hwpt_data_type { 475 485 IOMMU_HWPT_DATA_NONE = 0, 476 486 IOMMU_HWPT_DATA_VTD_S1 = 1, 477 487 IOMMU_HWPT_DATA_ARM_SMMUV3 = 2, 488 + IOMMU_HWPT_DATA_AMD_GUEST = 3, 478 489 }; 479 490 480 491 /**