From patchwork Thu Aug 3 14:31:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13340212 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 DBB86C001DF for ; Thu, 3 Aug 2023 14:37:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236252AbjHCOhl (ORCPT ); Thu, 3 Aug 2023 10:37:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45462 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235381AbjHCOhU (ORCPT ); Thu, 3 Aug 2023 10:37:20 -0400 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E81BA5256; Thu, 3 Aug 2023 07:36:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1691073383; x=1722609383; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=5XOAANYi6PhPbrJ+klTCobbNvd+SaqKSvWlM8mBjHuA=; b=jcNrFXIcGGPbGs/XZ/Wthsm8DY8KT7w5UAgREcZGaY6f8505HMNxjrbd nnYN/jsm1wtGnBAIlSIt9D0F7nEtLNMrFUv0CXQcyj8IP9S5G8XoADo9V 47bRzyowJMyyT0op6/sBRFgY45tOGvy6lkeCGpiuUzywjSRQDclaPm13C +qbt9I+Uu7vJfQK0Bu7HByrEM3X6XYksleKQS3cR/kGOAO/XSfDP96e1T t/0ZQ1zM+kQu9p6Ro8RKielCNUnC0MrqdvqUlrnYSz823X9WMHsetYchS hZR7BEmIcnldVi5Rv97gssk0UVZOKMJLdSHqjE6wYobtaX+gF+JiRJG/4 Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10791"; a="372643344" X-IronPort-AV: E=Sophos;i="6.01,252,1684825200"; d="scan'208";a="372643344" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Aug 2023 07:31:45 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10791"; a="759153147" X-IronPort-AV: E=Sophos;i="6.01,252,1684825200"; d="scan'208";a="759153147" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by orsmga008.jf.intel.com with ESMTP; 03 Aug 2023 07:31:45 -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 Subject: [PATCH v5 0/4] iommufd: Add iommu hardware info reporting Date: Thu, 3 Aug 2023 07:31:40 -0700 Message-Id: <20230803143144.200945-1-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org iommufd gives userspace the capability to manipulate iommu subsytem. e.g. DMA map/unmap etc. In the near future, it will support iommu nested translation. Different platform vendors have different implementation for the nested translation. For example, Intel VT-d supports using guest I/O page table as the stage-1 translation table. This requires guest I/O page table be compatible with hardware IOMMU. So before set up nested translation, userspace needs to know the hardware iommu information to understand the nested translation requirements. This series reports the iommu hardware information for a given device which has been bound to iommufd. It is preparation work for userspace to allocate hwpt for given device. Like the nested translation support[1]. This series introduces an iommu op to report the iommu hardware info, and an ioctl IOMMU_GET_HW_INFO is added to report such hardware info to user. enum iommu_hw_info_type is defined to differentiate the iommu hardware info reported to user hence user can decode them. This series only adds the framework for iommu hw info reporting, the complete reporting path needs vendor specific definition and driver support. The full code is available in [1] as well. [1] https://github.com/yiliu1765/iommufd/tree/wip/iommufd_nesting_08032023-yi (only the hw_info report path is the latest, other parts is wip) Change log: v5: - Return hw_info_type in the .hw_info op, hence drop hw_info_type field in iommu_ops (Kevin) - Add Jason's r-b for patch 01 - Address coding style comments from Jason and Kevin w.r.t. patch 02, 03 and 04 v4: https://lore.kernel.org/linux-iommu/20230724105936.107042-1-yi.l.liu@intel.com/ - Rename ioctl to IOMMU_GET_HW_INFO and structure to iommu_hw_info - Move the iommufd_get_hw_info handler to main.c - Place iommu_hw_info prior to iommu_hwpt_alloc - Update the function namings accordingly - Update uapi kdocs v3: https://lore.kernel.org/linux-iommu/20230511143024.19542-1-yi.l.liu@intel.com/#t - Add r-b from Baolu - Rename IOMMU_HW_INFO_TYPE_DEFAULT to be IOMMU_HW_INFO_TYPE_NONE to better suit what it means - Let IOMMU_DEVICE_GET_HW_INFO succeed even the underlying iommu driver does not have driver-specific data to report per below remark. https://lore.kernel.org/kvm/ZAcwJSK%2F9UVI9LXu@nvidia.com/ v2: https://lore.kernel.org/linux-iommu/20230309075358.571567-1-yi.l.liu@intel.com/ - Drop patch 05 of v1 as it is already covered by other series - Rename the capability info to be iommu hardware info v1: https://lore.kernel.org/linux-iommu/20230209041642.9346-1-yi.l.liu@intel.com/ Regards, Yi Liu Lu Baolu (1): iommu: Add new iommu op to get iommu hardware information Nicolin Chen (1): iommufd/selftest: Add coverage for IOMMU_GET_HW_INFO ioctl Yi Liu (2): iommu: Move dev_iommu_ops() to private header iommufd: Add IOMMU_GET_HW_INFO drivers/iommu/iommu-priv.h | 11 +++ drivers/iommu/iommufd/iommufd_test.h | 9 +++ drivers/iommu/iommufd/main.c | 79 +++++++++++++++++++ drivers/iommu/iommufd/selftest.c | 16 ++++ include/linux/iommu.h | 20 +++-- include/uapi/linux/iommufd.h | 44 +++++++++++ tools/testing/selftests/iommu/iommufd.c | 17 +++- tools/testing/selftests/iommu/iommufd_utils.h | 26 ++++++ 8 files changed, 210 insertions(+), 12 deletions(-)