[PATCH v6 05/13] iommufd: Introduce data struct for AMD nested domain allocation

Suravee Suthikulpanit
2026-01-15T06:09:11Z

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>
---
include/uapi/linux/iommufd.h | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index 3db37f6042a0..1dafbc552d37 100644
--- 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,
};

/**
--
2.34.1