On 2023/9/21 21:33, Baolu Lu wrote:
On 2023/9/21 15:54, Yi Liu wrote:
This adds the data structure for flushing iotlb for the nested domain allocated with IOMMU_HWPT_TYPE_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 | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+)
diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index 18a502e206c3..3050efbceb57 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -510,6 +510,40 @@ struct iommu_hw_info { }; #define IOMMU_GET_HW_INFO _IO(IOMMUFD_TYPE, IOMMUFD_CMD_GET_HW_INFO) +/**
- enum iommu_hwpt_vtd_s1_invalidate_flags - Flags for Intel VT-d
- * stage-1 cache invalidation
- @IOMMU_VTD_QI_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_QI_FLAGS_LEAF = 1 << 0, +};
+/**
- struct iommu_hwpt_vtd_s1_invalidate - Intel VT-d cache invalidation
- * (IOMMU_HWPT_TYPE_VTD_S1)
- @addr: The start address of the addresses to be invalidated.
Is there an alignment requirement for @addr? If so, is 4K alignment sufficient? Perhaps we need to document it here so that user space can calculate the @addr correctly.
yes, it should be aligned. let's document it in the kdoc.
- @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 under nested translation. Userspace uses this structure to
- tell host about the impacted caches 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).
- */
+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)
Best regards, baolu