From patchwork Thu Mar 9 08:08:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13166934 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 1B554C6FD19 for ; Thu, 9 Mar 2023 08:09:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229956AbjCIIJe (ORCPT ); Thu, 9 Mar 2023 03:09:34 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56730 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229549AbjCIIJd (ORCPT ); Thu, 9 Mar 2023 03:09:33 -0500 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B2D273017; Thu, 9 Mar 2023 00:09:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1678349372; x=1709885372; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=U1VZYmCOLesVIRYg1SmVLfX+1m4uRnRI1+5TxmUm/rk=; b=SuHuIuvYtX5XwEeZxLplMCfAohMhhJxWJSTVLKggSmD6vSXLxaHrmh1z 9PZp7/6vGuT3SjwwOyWX/fvsZYOGjA2Lf8NaumVsZIzHnwzbT7i5hqAv+ LgZBU7hw1CfS0lh6Ba/VbEYHBsaNBgWFVVe6AGVz/+FuOtknx5ybjLCME 4NtfY3TPr3te2lHqn4VtzEUkoOQs51ZOILWd76CPaHOCloiA8qfE21PWZ Sp+CqfW4u1RotluzC495G1Kur5w8ZYYLka95uKgdlFcS5jdD5rjIJHRwz CBIIOHLMz/iYzKPiLLyLH7kgQ9MVYS8ayBqe+A3EKtiI6dzsxb1tbD8Qn A==; X-IronPort-AV: E=McAfee;i="6500,9779,10643"; a="364023029" X-IronPort-AV: E=Sophos;i="5.98,245,1673942400"; d="scan'208";a="364023029" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Mar 2023 00:09:23 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10643"; a="787471348" X-IronPort-AV: E=Sophos;i="5.98,245,1673942400"; d="scan'208";a="787471348" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by fmsmga002.fm.intel.com with ESMTP; 09 Mar 2023 00:09:20 -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 Subject: [PATCH 01/12] iommu: Add new iommu op to create domains owned by userspace Date: Thu, 9 Mar 2023 00:08:59 -0800 Message-Id: <20230309080910.607396-2-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230309080910.607396-1-yi.l.liu@intel.com> References: <20230309080910.607396-1-yi.l.liu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org From: Lu Baolu Introduce a new iommu_domain op to create domains owned by userspace, e.g. through iommufd. These domains have a few different properties compares to kernel owned domains: - They may be UNMANAGED domains, but created with special parameters. For instance aperture size changes/number of levels, different IOPTE formats, or other things necessary to make a vIOMMU work - We have to track all the memory allocations with GFP_KERNEL_ACCOUNT to make the cgroup sandbox stronger - Device-specialty domains, such as NESTED domains can be created by iommufd. The new op clearly says the domain is being created by IOMMUFD, that the domain is intended for userspace use, and it provides a way to pass a driver specific uAPI structure to customize the created domain to exactly what the vIOMMU userspace driver requires. iommu drivers that cannot support VFIO/IOMMUFD should not support this op. This includes any driver that cannot provide a fully functional UNMANAGED domain. This op chooses to make the special parameters opaque to the core. This suits the current usage model where accessing any of the IOMMU device special parameters does require a userspace driver that matches the kernel driver. If a need for common parameters, implemented similarly by several drivers, arises then there is room in the design to grow a generic parameter set as well. This new op for now is only supposed to be used by iommufd, hence no wrapper for it. iommufd would call the callback directly. As for domain free, iommufd would use iommu_domain_free(). Suggested-by: Jason Gunthorpe Signed-off-by: Lu Baolu Signed-off-by: Yi Liu Reviewed-by: Jason Gunthorpe --- include/linux/iommu.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 3ef84ee359d2..a269bc62a31c 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -229,6 +229,7 @@ struct iommu_iotlb_gather { * after use. Return the data buffer if success, or ERR_PTR on * failure. * @domain_alloc: allocate iommu domain + * @domain_alloc_user: allocate user iommu domain * @probe_device: Add device to iommu driver handling * @release_device: Remove device from iommu driver handling * @probe_finalize: Do final setup work after the device is added to an IOMMU @@ -266,6 +267,9 @@ struct iommu_ops { /* Domain allocation and freeing by the iommu driver */ struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type); + struct iommu_domain *(*domain_alloc_user)(struct device *dev, + struct iommu_domain *parent, + const void *user_data); struct iommu_device *(*probe_device)(struct device *dev); void (*release_device)(struct device *dev);