Re: [PATCH 07/12] iommufd: Add IOMMU_HWPT_INVALIDATE

[Jason Gunthorpe]

On Thu, Mar 09, 2023 at 12:09:05AM -0800, Yi Liu wrote:
> +int iommufd_hwpt_invalidate(struct iommufd_ucmd *ucmd)
> +{
> +	struct iommu_hwpt_invalidate *cmd = ucmd->cmd;
> +	struct iommufd_hw_pagetable *hwpt;
> +	u64 user_ptr;
> +	u32 user_data_len, klen;
> +	int rc = 0;
> +
> +	/*
> +	 * For a user-managed HWPT, type should not be IOMMU_HWPT_TYPE_DEFAULT.
> +	 * data_len should not exceed the size of iommufd_invalidate_buffer.
> +	 */
> +	if (cmd->data_type == IOMMU_HWPT_TYPE_DEFAULT || !cmd->data_len ||
> +	    cmd->data_type >= ARRAY_SIZE(iommufd_hwpt_invalidate_info_size))
> +		return -EOPNOTSUPP;

This needs to do the standard check for zeros in unknown trailing data
bit. Check that alloc does it too

Jason