Introduce IOMMU_HWPT_DATA_AMD_V2 data type for AMD IOMMU v2 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.

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 0f7212f9e0ce..a12353488c83 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -455,16 +455,27 @@ struct iommu_hwpt_arm_smmuv3 {
 	__aligned_le64 ste[2];
 };
 
+/**
+ * struct iommu_hwpt_amd_v2 - AMD IOMMU specific user-managed
+ *                            v2 I/O page table data
+ * @dte: Guest Device Table Entry (DTE)
+ */
+struct iommu_hwpt_amd_v2 {
+	__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_V2: AMD IOMMUv2 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_V2 = 3,
 };
 
 /**
-- 
2.34.1

On Wed, Aug 20, 2025 at 11:30:06AM +0000, Suravee Suthikulpanit wrote:
> Introduce IOMMU_HWPT_DATA_AMD_V2 data type for AMD IOMMU v2 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.
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
> ---
>  include/uapi/linux/iommufd.h | 11 +++++++++++
>  1 file changed, 11 insertions(+)

I wouldn't call this AMD_V2, the spec calls it "GCR3" and "Guest"

IOMMU_HWPT_DATA_AMD_GUEST

Otherwise 

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason