From patchwork Fri Oct 20 09:24:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13430369 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3FABDCDB474 for ; Fri, 20 Oct 2023 09:24:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376684AbjJTJYt (ORCPT ); Fri, 20 Oct 2023 05:24:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59084 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376614AbjJTJYf (ORCPT ); Fri, 20 Oct 2023 05:24:35 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7A6D2D51; Fri, 20 Oct 2023 02:24:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1697793873; x=1729329873; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=HTvHwI4EhRpQB7I9M65i/pRD2X6B+RdjiZDfOoc2Ot8=; b=Cd1p0UEp+PhCMy/gagfpL74wmuW8eejukpF2TfHLR4fLnC/K5xmVqd+C zu/q9hp4RoU+9KZ2gJXicMG8Vw5t18JuvgECVSkKHirS8URYg2cuse+f0 PthW1zZihS3xY1s6jA05q/DWUVQGVdQIdB3GDqT5kW9+1EmFzG94Y7PA3 /G8V4yx/8SgD69iOBDYyTTBp3MhbaoL2R8FDxYrrv76gJZ0g40Y6i8IAG 5vCtwQ0p0BPPIaKJjz7sGwEeB44c8k/T/ZvtXPVk3G8heZwfQJiRMko/G Zrik4PYri6zGjZR8ha2akjI2njMKTM9t+UrhFpVhByDpGScpgtUtYgyFY A==; X-IronPort-AV: E=McAfee;i="6600,9927,10868"; a="472685490" X-IronPort-AV: E=Sophos;i="6.03,238,1694761200"; d="scan'208";a="472685490" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Oct 2023 02:24:30 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10868"; a="750859678" X-IronPort-AV: E=Sophos;i="6.03,238,1694761200"; d="scan'208";a="750859678" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by orsmga007.jf.intel.com with ESMTP; 20 Oct 2023 02:24:29 -0700 From: Yi Liu To: joro@8bytes.org, alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com, robin.murphy@arm.com, baolu.lu@linux.intel.com Cc: cohuck@redhat.com, eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org, mjrosato@linux.ibm.com, chao.p.peng@linux.intel.com, yi.l.liu@intel.com, yi.y.sun@linux.intel.com, peterx@redhat.com, jasowang@redhat.com, shameerali.kolothum.thodi@huawei.com, lulu@redhat.com, suravee.suthikulpanit@amd.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, zhenzhong.duan@intel.com, joao.m.martins@oracle.com, xin.zeng@intel.com Subject: [PATCH v5 3/6] iommu: Add iommu_copy_struct_from_user_array helper Date: Fri, 20 Oct 2023 02:24:23 -0700 Message-Id: <20231020092426.13907-4-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231020092426.13907-1-yi.l.liu@intel.com> References: <20231020092426.13907-1-yi.l.liu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Nicolin Chen Wrap up the data type/pointer/num sanity and __iommu_copy_struct_from_user call for iommu drivers to copy driver specific data at a specific location in the struct iommu_user_data_array. And expect it to be used in cache_invalidate_user ops for example. Signed-off-by: Nicolin Chen Co-developed-by: Yi Liu Signed-off-by: Yi Liu --- include/linux/iommu.h | 54 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index de52835446f4..c0ee1d5d9447 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -305,6 +305,60 @@ __iommu_copy_struct_from_user(void *dst_data, __iommu_copy_struct_from_user(kdst, user_data, data_type, sizeof(*kdst), \ offsetofend(typeof(*kdst), min_last)) +/** + * __iommu_copy_struct_from_user_array - Copy iommu driver specific user space + * data from an iommu_user_data_array + * @dst_data: Pointer to an iommu driver specific user data that is defined in + * include/uapi/linux/iommufd.h + * @src_array: Pointer to a struct iommu_user_data_array for a user space array + * @data_type: The data type of the @dst_data. Must match with @src_array.type + * @index: Index to offset the location in the array to copy user data from + * @data_len: Length of current user data structure, i.e. sizeof(struct _dst) + * @min_len: Initial length of user data structure for backward compatibility. + * This should be offsetofend using the last member in the user data + * struct that was initially added to include/uapi/linux/iommufd.h + */ +static inline int +__iommu_copy_struct_from_user_array(void *dst_data, + const struct iommu_user_data_array *src_array, + unsigned int data_type, unsigned int index, + size_t data_len, size_t min_len) +{ + struct iommu_user_data src_data; + + if (src_array->type != data_type) + return -EINVAL; + if (WARN_ON(!src_array || index >= src_array->entry_num)) + return -EINVAL; + if (!src_array->entry_num) + return -EINVAL; + src_data.uptr = src_array->uptr + src_array->entry_len * index; + src_data.len = src_array->entry_len; + src_data.type = src_array->type; + + return __iommu_copy_struct_from_user(dst_data, &src_data, data_type, + data_len, min_len); +} + +/** + * iommu_copy_struct_from_user_array - Copy iommu driver specific user space + * data from an iommu_user_data_array + * @kdst: Pointer to an iommu driver specific user data that is defined in + * include/uapi/linux/iommufd.h + * @user_array: Pointer to a struct iommu_user_data_array for a user space array + * @data_type: The data type of the @kdst. Must match with @user_array->type + * @index: Index to offset the location in the array to copy user data from + * @min_last: The last memember of the data structure @kdst points in the + * initial version. + * Return 0 for success, otherwise -error. + */ +#define iommu_copy_struct_from_user_array(kdst, user_array, data_type, \ + index, min_last) \ + __iommu_copy_struct_from_user_array(kdst, user_array, data_type, \ + index, sizeof(*kdst), \ + offsetofend(typeof(*kdst), \ + min_last)) + /** * struct iommu_ops - iommu ops and capabilities * @capable: check capability