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>

diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index 3db37f6042a09278e5928e92e999f1f163119c67..1dafbc552d37de51a93a23d9ce1cf3db7abbbc85 100644 (file)
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -465,16 +465,27 @@ struct iommu_hwpt_arm_smmuv3 {
        __aligned_le64 ste[2];
 };
 
+/**
+ * struct iommu_hwpt_amd_guest - AMD IOMMU guest I/O page table data
+ *                              (IOMMU_HWPT_DATA_AMD_GUEST)
+ * @dte: Guest Device Table Entry (DTE)
+ */
+struct iommu_hwpt_amd_guest {
+       __aligned_u64 dte[4];
+};
+
 /**
  * enum iommu_hwpt_data_type - IOMMU HWPT Data Type
  * @IOMMU_HWPT_DATA_NONE: no data
  * @IOMMU_HWPT_DATA_VTD_S1: Intel VT-d stage-1 page table
  * @IOMMU_HWPT_DATA_ARM_SMMUV3: ARM SMMUv3 Context Descriptor Table
+ * @IOMMU_HWPT_DATA_AMD_GUEST: AMD IOMMU guest page table
  */
 enum iommu_hwpt_data_type {
        IOMMU_HWPT_DATA_NONE = 0,
        IOMMU_HWPT_DATA_VTD_S1 = 1,
        IOMMU_HWPT_DATA_ARM_SMMUV3 = 2,
+       IOMMU_HWPT_DATA_AMD_GUEST = 3,
 };
 
 /**