From patchwork Tue Jan 2 14:38:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 184369 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7301:6f82:b0:100:9c79:88ff with SMTP id tb2csp4483495dyb; Tue, 2 Jan 2024 06:40:42 -0800 (PST) X-Google-Smtp-Source: AGHT+IFYPz0bayS6wnP1cANzQxieRGJAbj/PY00hY5pg1owJ/+cPE6I3ey0/ka/AYq/3TzHdRCz1 X-Received: by 2002:a0d:dfd1:0:b0:5e7:ae43:e90f with SMTP id i200-20020a0ddfd1000000b005e7ae43e90fmr9890648ywe.3.1704206442485; Tue, 02 Jan 2024 06:40:42 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1704206442; cv=none; d=google.com; s=arc-20160816; b=Uw1fCQoldvODHuau2J+jb2QWP5DWFZ645W+yJsV9SK0JdCbtLC59UP88h3PyN5M3eK PYR0Lda2GtZT/XqnQ0YL/mBN/Vjs1p2tQP+pcRYGvf1kBj2Axk9XMTbicDzqwFOZoL9a 1XTO6Qs2/f+2N/3TtbFGTr36ZMXcxmCTrKVSktUXKPn34somVbhXi1MsJ6WA2BQY89Y7 7yw/WcmweES+j8OxajQyXAd2SCvWd5bbfW77JwqprS26XTL0v1woEZrWt4lXWcT/2vA5 DbaIScTrFKaZWqAnJ40BsJaixDwLlKySNW5wcW80ajbLW6trxfqdluLyXG0g0Wus+XTn pcxQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:references:in-reply-to:message-id :date:subject:cc:to:from:dkim-signature; bh=euG6NwFyvGpQyx4bY1dT20hCi7fPaxrH9e/fkW+iluU=; fh=JbgkfaGVOLJQIgFMcRSNKOzjVQFwxW1pSzjP6daOUwc=; b=p5f8FB4lAGFxXdfp3ar627DInrEeS6GExi0fqLQ2qh8/6D9XxUir3rP2ix2gSKE1eT dwVSjJ8BMuV+yl3pS500g7s4A2nM6uHqd0b+VnJe7pM+0Az4mUwtwAvrBIP2j3cf8AUx xr41hik9lSlNPhUfhSDfaecuQiTGKHsv/ZYCp2+iMebWaHwn7QalQoxW73uKqknqeTsf VWYlx3butTil+CvykONQBzIfaxl5QVPpkMUOxxMbKxZt2QJRXj0cTINMLVPwQmnkkcp7 AIIX37MStdD9Eh6FJcPUkHgFbvDp/3iz0AYJon84xj3jmo8sIG5TrOzcSkbamyuAxuW5 TSfw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=a0jfwGRT; spf=pass (google.com: domain of linux-kernel+bounces-14492-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) smtp.mailfrom="linux-kernel+bounces-14492-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from ny.mirrors.kernel.org (ny.mirrors.kernel.org. [147.75.199.223]) by mx.google.com with ESMTPS id b8-20020a0cf048000000b0067f93558a30si25339802qvl.362.2024.01.02.06.40.42 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Jan 2024 06:40:42 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-14492-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=a0jfwGRT; spf=pass (google.com: domain of linux-kernel+bounces-14492-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) smtp.mailfrom="linux-kernel+bounces-14492-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ny.mirrors.kernel.org (Postfix) with ESMTPS id 3AEB61C22064 for ; Tue, 2 Jan 2024 14:40:42 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A9020156DA; Tue, 2 Jan 2024 14:38:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="a0jfwGRT" X-Original-To: linux-kernel@vger.kernel.org Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4A72F1428F; Tue, 2 Jan 2024 14:38:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1704206322; x=1735742322; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=a0MtJfDdMrZSQXPjcVw/ypmtgFbBgW6CUZyjsKPTKtk=; b=a0jfwGRTbIaqtdf6y0CU2WneY+Nw6M952ZPe2cpVzBuJBX8pO6Y+bDAG ofCMOAG16BJ/OtgCXZndEPX0Le37OJYCsMFTSXKxT5aquVIiiJbDR25og U9jzUa/wlS9E6j//vGOgjVcmsH612vNyWiwJNLeQXgccOh4qre0z76A8t YHUm5+VDQ+ay03v83NJNUjCYp3UQ5GhGLeWsD+9zt6eUMGWseo1rITre/ EufdOG1AjKRa2kfXbe+w/NQX2PbR+UqHcH149j9EST8iy2rGeafdN6Y2E W3pI2u59NBdaa1QO4J8Oa4uDDDTWbuc0zFT1lU8jmPP2Iqnh8DgGooi5+ w==; X-IronPort-AV: E=McAfee;i="6600,9927,10941"; a="10270440" X-IronPort-AV: E=Sophos;i="6.04,325,1695711600"; d="scan'208";a="10270440" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Jan 2024 06:38:42 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10941"; a="923234273" X-IronPort-AV: E=Sophos;i="6.04,325,1695711600"; d="scan'208";a="923234273" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by fmsmga001.fm.intel.com with ESMTP; 02 Jan 2024 06:38:40 -0800 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, yan.y.zhao@intel.com, j.granados@samsung.com Subject: [PATCH v10 03/10] iommu: Add iommu_copy_struct_from_user_array helper Date: Tue, 2 Jan 2024 06:38:27 -0800 Message-Id: <20240102143834.146165-4-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240102143834.146165-1-yi.l.liu@intel.com> References: <20240102143834.146165-1-yi.l.liu@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1786989974170757770 X-GMAIL-MSGID: 1786989974170757770 From: Nicolin Chen Wrap up the data 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 iommu_respond_struct_to_user_array() to copy response to a specific location in the struct iommu_user_data_array. And expect it to be used in cache_invalidate_user ops for example. Reviewed-by: Kevin Tian Signed-off-by: Nicolin Chen Co-developed-by: Yi Liu Signed-off-by: Yi Liu --- include/linux/iommu.h | 74 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 93c0d12dd047..c3434c9eaa6d 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -341,6 +341,80 @@ static inline int __iommu_copy_struct_from_user( 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 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 (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 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)) + +/** + * iommu_respond_struct_to_user_array - Copy the response in @ksrc back to + * a specific entry of user array + * @user_array: Pointer to a struct iommu_user_data_array for a user space + * array + * @index: Index to the location in the array to copy response + * @ksrc: Pointer to kernel structure + * @klen: Length of @ksrc struct + * + * This only copies response of one entry (@index) in @user_array. + */ +static inline int +iommu_respond_struct_to_user_array(const struct iommu_user_data_array *array, + unsigned int index, void *ksrc, size_t klen) +{ + if (copy_to_user(array->uptr + array->entry_len * index, + ksrc, min_t(size_t, array->entry_len, klen))) + return -EFAULT; + return 0; +} + /** * struct iommu_ops - iommu ops and capabilities * @capable: check capability