From patchwork Fri Oct 20 09:19:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 736488 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 193ECC001DF for ; Fri, 20 Oct 2023 09:20:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376731AbjJTJUX (ORCPT ); Fri, 20 Oct 2023 05:20:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52614 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376682AbjJTJUT (ORCPT ); Fri, 20 Oct 2023 05:20:19 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E181010C2; Fri, 20 Oct 2023 02:20:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1697793606; x=1729329606; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=WChOZpAlR4QOIzkCQdzabdjxgRBGTfmO8qHsRuRKFAo=; b=GOIuf68kTp6sZmdbZnjajFmCzFZ7RGWs/L85jy+v3/CaGpOuHFXyKPrS GH0o7g+ptkiPZf4Bq3lFrK668UmaMN4qBFc9+EU8KL8Cntyq572BOVqkG LYy0SBtwH8TdDueC3YKRTJtMjj4mEUHLf7gce12N6ufAzSaYo1QLYq8GN uvwrUfJGt6CDBzOk5Gs91av3pqUfx67f53KHkYbppC2asMTqFj/x3AGFw cgTj05iWYg0TQ+H2LWZk3UwuMa8aWQeEBv6/hVX1OH6NI9oezEnsXRYZz yrK0ZG+TcdYVsuMg2AJKR37dnqhasb+FQzQ3DkhoVe7HAJaXltZoR+KB6 g==; X-IronPort-AV: E=McAfee;i="6600,9927,10868"; a="366693428" X-IronPort-AV: E=Sophos;i="6.03,238,1694761200"; d="scan'208";a="366693428" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Oct 2023 02:20:03 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10868"; a="707179474" X-IronPort-AV: E=Sophos;i="6.03,238,1694761200"; d="scan'208";a="707179474" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by orsmga003.jf.intel.com with ESMTP; 20 Oct 2023 02:20:03 -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 08/10] iommu: Add iommu_copy_struct_from_user helper Date: Fri, 20 Oct 2023 02:19:44 -0700 Message-Id: <20231020091946.12173-9-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231020091946.12173-1-yi.l.liu@intel.com> References: <20231020091946.12173-1-yi.l.liu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org From: Nicolin Chen Wrap up the data type/pointer/len sanity and a copy_struct_from_user call for iommu drivers to copy driver specific data via struct iommu_user_data. And expect it to be used in the domain_alloc_user op for example. Signed-off-by: Nicolin Chen Co-developed-by: Yi Liu Signed-off-by: Yi Liu --- include/linux/iommu.h | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index cdb989b853a5..48b8a9a03ae7 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -246,6 +246,47 @@ struct iommu_user_data { size_t len; }; +/** + * __iommu_copy_struct_from_user - Copy iommu driver specific user space data + * @dst_data: Pointer to an iommu driver specific user data that is defined in + * include/uapi/linux/iommufd.h + * @src_data: Pointer to a struct iommu_user_data for user space data info + * @data_type: The data type of the @dst_data. Must match with @src_data.type + * @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(void *dst_data, + const struct iommu_user_data *src_data, + unsigned int data_type, size_t data_len, + size_t min_len) +{ + if (src_data->type != data_type) + return -EINVAL; + if (WARN_ON(!dst_data || !src_data)) + return -EINVAL; + if (src_data->len < min_len || data_len < src_data->len) + return -EINVAL; + return copy_struct_from_user(dst_data, data_len, + src_data->uptr, src_data->len); +} + +/** + * iommu_copy_struct_from_user - Copy iommu driver specific user space data + * @kdst: Pointer to an iommu driver specific user data that is defined in + * include/uapi/linux/iommufd.h + * @user_data: Pointer to a struct iommu_user_data for user space data info + * @data_type: The data type of the @kdst. Must match with @user_data->type + * @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(kdst, user_data, data_type, min_last) \ + __iommu_copy_struct_from_user(kdst, user_data, data_type, sizeof(*kdst), \ + offsetofend(typeof(*kdst), min_last)) + /** * struct iommu_ops - iommu ops and capabilities * @capable: check capability