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From:   Yi Liu <yi.l.liu@intel.com>
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Subject: [PATCH v8 1/8] iommufd: Add data structure for Intel VT-d stage-1 domain allocation
Date:   Wed, 25 Oct 2023 21:42:09 -0700
Message-Id: <20231026044216.64964-2-yi.l.liu@intel.com>
In-Reply-To: <20231026044216.64964-1-yi.l.liu@intel.com>
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This adds IOMMU_HWPT_DATA_VTD_S1 for stage-1 hw_pagetable of Intel
VT-d and the corressponding data structure for userspace specified parameter
for the domain allocation.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 include/uapi/linux/iommufd.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index d816deac906f..3ce5ee5f09b6 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -361,12 +361,42 @@ enum iommufd_hwpt_alloc_flags {
 	IOMMU_HWPT_ALLOC_DIRTY_TRACKING = 1 << 1,
 };
 
+/**
+ * enum iommu_hwpt_vtd_s1_flags - Intel VT-d stage-1 page table
+ *                                entry attributes
+ * @IOMMU_VTD_S1_SRE: Supervisor request
+ * @IOMMU_VTD_S1_EAFE: Extended access enable
+ * @IOMMU_VTD_S1_WPE: Write protect enable
+ */
+enum iommu_hwpt_vtd_s1_flags {
+	IOMMU_VTD_S1_SRE = 1 << 0,
+	IOMMU_VTD_S1_EAFE = 1 << 1,
+	IOMMU_VTD_S1_WPE = 1 << 2,
+};
+
+/**
+ * struct iommu_hwpt_vtd_s1 - Intel VT-d stage-1 page table
+ *                            info (IOMMU_HWPT_DATA_VTD_S1)
+ * @flags: Combination of enum iommu_hwpt_vtd_s1_flags
+ * @pgtbl_addr: The base address of the stage-1 page table.
+ * @addr_width: The address width of the stage-1 page table
+ * @__reserved: Must be 0
+ */
+struct iommu_hwpt_vtd_s1 {
+	__aligned_u64 flags;
+	__aligned_u64 pgtbl_addr;
+	__u32 addr_width;
+	__u32 __reserved;
+};
+
 /**
  * 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
  */
 enum iommu_hwpt_data_type {
 	IOMMU_HWPT_DATA_NONE,
+	IOMMU_HWPT_DATA_VTD_S1,
 };
 
 /**
-- 
2.34.1