[RFC PATCH 4/6] iommufd: Introduce data struct for AMD nested domain allocation

[Suravee Suthikulpanit]

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@xxxxxxx>
---
 include/uapi/linux/iommufd.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index bf4a1f8ab748..e2240d430dd1 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -389,14 +389,37 @@ struct iommu_hwpt_vtd_s1 {
 	__u32 __reserved;
 };
 
+/**
+ * struct iommu_hwpt_amd_v2 - AMD IOMMU specific user-managed
+ *                            v2 I/O page table data
+ * @gcr3: GCR3 guest physical ddress
+ * @gid: Guest ID
+ * @iommu_id: IOMMU host device ID
+ * @gdev_id: Guest device ID
+ * @gdom_id: Guest domain ID
+ * @glx: GCR3 table levels
+ * @guest_paging_mode: Guest v2 page table paging mode
+ */
+struct iommu_hwpt_amd_v2 {
+	__aligned_u64 gcr3;
+	__u32 gid;
+	__u32 iommu_id;
+	__u16 gdev_id;
+	__u16 gdom_id;
+	__u16 glx;
+	__u16 guest_paging_mode;
+};
+
 /**
  * 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_AMD_V2: AMD IOMMUv2 page table
  */
 enum iommu_hwpt_data_type {
 	IOMMU_HWPT_DATA_NONE,
 	IOMMU_HWPT_DATA_VTD_S1,
+	IOMMU_HWPT_DATA_AMD_V2,
 };
 
 /**
-- 
2.34.1