[PATCH v3 01/10] iommufd: Add data structure for Intel VT-d stage-1 domain allocation

Yi Liu
2023-05-11T14:52:35Z

This adds IOMMU_HWPT_TYPE_VTD_S1 for stage-1 hw_pagetable of Intel VT-d
and the corressponding data structure for userspace specified parameter
for the domain allocation.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
include/uapi/linux/iommufd.h | 57 ++++++++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)

diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index 06dcad6ab082..c2658394827a 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -353,9 +353,64 @@ struct iommu_vfio_ioas {
/**
* enum iommu_hwpt_type - IOMMU HWPT Type
* @IOMMU_HWPT_TYPE_DEFAULT: default
+ * @IOMMU_HWPT_TYPE_VTD_S1: Intel VT-d stage-1 page table
*/
enum iommu_hwpt_type {
IOMMU_HWPT_TYPE_DEFAULT,
+ IOMMU_HWPT_TYPE_VTD_S1,
+};
+
+/**
+ * enum iommu_hwpt_intel_vtd_flags - Intel VT-d stage-1 page
+ * table entry attributes
+ * @IOMMU_VTD_PGTBL_SRE: Supervisor request
+ * @IOMMU_VTD_PGTBL_EAFE: Extended access enable
+ * @IOMMU_VTD_PGTBL_PCD: Page-level cache disable
+ * @IOMMU_VTD_PGTBL_PWT: Page-level write through
+ * @IOMMU_VTD_PGTBL_EMTE: Extended mem type enable
+ * @IOMMU_VTD_PGTBL_CD: PASID-level cache disable
+ * @IOMMU_VTD_PGTBL_WPE: Write protect enable
+ */
+enum iommu_hwpt_intel_vtd_flags {
+ IOMMU_VTD_PGTBL_SRE = 1 << 0,
+ IOMMU_VTD_PGTBL_EAFE = 1 << 1,
+ IOMMU_VTD_PGTBL_PCD = 1 << 2,
+ IOMMU_VTD_PGTBL_PWT = 1 << 3,
+ IOMMU_VTD_PGTBL_EMTE = 1 << 4,
+ IOMMU_VTD_PGTBL_CD = 1 << 5,
+ IOMMU_VTD_PGTBL_WPE = 1 << 6,
+ IOMMU_VTD_PGTBL_LAST = 1 << 7,
+};
+
+/**
+ * struct iommu_hwpt_intel_vtd - Intel VT-d specific user-managed
+ * stage-1 page table info
+ * @flags: Combination of enum iommu_hwpt_intel_vtd_flags
+ * @pgtbl_addr: The base address of the user-managed stage-1 page table.
+ * @pat: Page attribute table data to compute effective memory type
+ * @emt: Extended memory type
+ * @addr_width: The address width of the untranslated addresses that are
+ * subjected to the user-managed stage-1 page table.
+ * @__reserved: Must be 0
+ *
+ * The Intel VT-d specific data for creating hw_pagetable to represent
+ * the user-managed stage-1 page table that is used in nested translation.
+ *
+ * In nested translation, the stage-1 page table locates in the address
+ * space that defined by the corresponding stage-2 page table. Hence the
+ * stage-1 page table base address value should not be higher than the
+ * maximum untranslated address of stage-2 page table.
+ *
+ * The paging level of the stage-1 page table should be compatible with
+ * the hardware iommu. Otherwise, the allocation would be failed.
+ */
+struct iommu_hwpt_intel_vtd {
+ __u64 flags;
+ __u64 pgtbl_addr;
+ __u32 pat;
+ __u32 emt;
+ __u32 addr_width;
+ __u32 __reserved;
};

/**
@@ -391,6 +446,8 @@ enum iommu_hwpt_type {
* +------------------------------+-------------------------------------+-----------+
* | IOMMU_HWPT_TYPE_DEFAULT | N/A | IOAS |
* +------------------------------+-------------------------------------+-----------+
+ * | IOMMU_HWPT_TYPE_VTD_S1 | struct iommu_hwpt_intel_vtd | HWPT |
+ * +------------------------------+-------------------------------------+-----------+
*/
struct iommu_hwpt_alloc {
__u32 size;
--
2.34.1