[PATCH v7 1/3] iommufd: Add data structure for Intel VT-d stage-1 cache invalidation

Yi Liu
2023-11-17T13:18:20Z

This adds the data structure for flushing iotlb for the nested domain
allocated with IOMMU_HWPT_DATA_VTD_S1 type.

This only supports invalidating IOTLB, but no for device-TLB as device-TLB
invalidation will be covered automatically in the IOTLB invalidation if the
underlying IOMMU driver has enabled ATS for the affected device.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
include/uapi/linux/iommufd.h | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)

diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index 7f92cecc87d7..cafd98642abf 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -614,6 +614,42 @@ struct iommu_hwpt_get_dirty_bitmap {
#define IOMMU_HWPT_GET_DIRTY_BITMAP _IO(IOMMUFD_TYPE, \
IOMMUFD_CMD_HWPT_GET_DIRTY_BITMAP)

+/**
+ * enum iommu_hwpt_vtd_s1_invalidate_flags - Flags for Intel VT-d
+ * stage-1 cache invalidation
+ * @IOMMU_VTD_INV_FLAGS_LEAF: The LEAF flag indicates whether only the
+ * leaf PTE caching needs to be invalidated
+ * and other paging structure caches can be
+ * preserved.
+ */
+enum iommu_hwpt_vtd_s1_invalidate_flags {
+ IOMMU_VTD_INV_FLAGS_LEAF = 1 << 0,
+};
+
+/**
+ * struct iommu_hwpt_vtd_s1_invalidate - Intel VT-d cache invalidation
+ * (IOMMU_HWPT_DATA_VTD_S1)
+ * @addr: The start address of the addresses to be invalidated. It needs
+ * to be 4KB aligned.
+ * @npages: Number of contiguous 4K pages to be invalidated.
+ * @flags: Combination of enum iommu_hwpt_vtd_s1_invalidate_flags
+ * @__reserved: Must be 0
+ *
+ * The Intel VT-d specific invalidation data for user-managed stage-1 cache
+ * invalidation in nested translation. Userspace uses this structure to
+ * tell the impacted cache scope after modifying the stage-1 page table.
+ *
+ * Invalidating all the caches related to the page table by setting @addr
+ * to be 0 and @npages to be __aligned_u64(-1). This includes the
+ * corresponding device-TLB if ATS is enabled on the attached devices.
+ */
+struct iommu_hwpt_vtd_s1_invalidate {
+ __aligned_u64 addr;
+ __aligned_u64 npages;
+ __u32 flags;
+ __u32 __reserved;
+};
+
/**
* struct iommu_hwpt_invalidate - ioctl(IOMMU_HWPT_INVALIDATE)
* @size: sizeof(struct iommu_hwpt_invalidate)
--
2.34.1