On 2023/12/22 11:19, Tian, Kevin wrote:
From: Liu, Yi L
Sent: Thursday, December 21, 2023 11:40 PM
+
+int iommufd_hwpt_invalidate(struct iommufd_ucmd *ucmd)
+{
+ struct iommu_hwpt_invalidate *cmd = ucmd->cmd;
+ struct iommu_user_data_array data_array = {
+ .type = cmd->
> From: Liu, Yi L
> Sent: Thursday, December 21, 2023 11:40 PM
> +
> +int iommufd_hwpt_invalidate(struct iommufd_ucmd *ucmd)
> +{
> + struct iommu_hwpt_invalidate *cmd = ucmd->cmd;
> + struct iommu_user_data_array data_array = {
> + .type = cmd->req_type,
> + .uptr
In nested translation, the stage-1 page table is user-managed but cached
by the IOMMU hardware, so an update on present page table entries in the
stage-1 page table should be followed with a cache invalidation.
Add an IOMMU_HWPT_INVALIDATE ioctl to support such a cache invalidation.
It takes hwpt_
