From patchwork Thu Mar 9 08:09:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13166937 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 77542C74A4B for ; Thu, 9 Mar 2023 08:09:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229965AbjCIIJi (ORCPT ); Thu, 9 Mar 2023 03:09:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56754 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229928AbjCIIJe (ORCPT ); Thu, 9 Mar 2023 03:09:34 -0500 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4211870413; Thu, 9 Mar 2023 00:09:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1678349373; x=1709885373; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=f6a+QAIRGPkjHfuRSA0kkXfLfQHx0PbJp4L/PN4a0aE=; b=e1zPhXb3dOUV+Bc4QV8O8xkWuvAwq1UI8SZX+f2ek4w9POvOHmwvNxFo u9N15MXHF1q0vvDPqBgJqnNNo2D2oCBGrLoWIrMAunhAKllGzV5DaCo/c dMN738rDHXt+KKEWzX/Q2Fpf8jwlqYXxAQscD8dm2vkRkaCWn2CvLvU98 tS/aVbuw7qAH0qanQ9VZgLzRJhKnQUKwf2fH9JT0W+cYUROd18omT9CRG V23b0r7go2xRm/oIRhq3vlYrq5JacOTYzvQIvrnTCd9zVfLUnOhuENWmV uhrqi1CMu0EB3l8bsO6/+z2ECK0yqjwWCi03XtvTM1oM/pjtuQEDcBnRS Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10643"; a="364023048" X-IronPort-AV: E=Sophos;i="5.98,245,1673942400"; d="scan'208";a="364023048" 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 00:09:25 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10643"; a="787471371" X-IronPort-AV: E=Sophos;i="5.98,245,1673942400"; d="scan'208";a="787471371" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by fmsmga002.fm.intel.com with ESMTP; 09 Mar 2023 00:09:24 -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 04/12] iommufd: Pass parent hwpt and user_data to iommufd_hw_pagetable_alloc() Date: Thu, 9 Mar 2023 00:09:02 -0800 Message-Id: <20230309080910.607396-5-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 Nested translation has stage-1 and stage-2 page tables. A stage-1 page table is managed by user space, and it needs to work with a stage-2 page table, which is a parent hwpt for the stage-1 hwpt. iommu core already supports accepting parent iommu_domain and user_data to allocate an iommu_domain. This makes iommufd_hw_pagetable_alloc() to accept the parent hwpt and user_data, and relays them to iommu core, to prepare for supporting hw_pagetable allocation with user_data. Also, add a parent pointer in struct iommufd_hw_pagetable for taking and releasing its refcount. Co-developed-by: Nicolin Chen Signed-off-by: Nicolin Chen Signed-off-by: Yi Liu --- drivers/iommu/iommufd/device.c | 2 +- drivers/iommu/iommufd/hw_pagetable.c | 28 ++++++++++++++++++++++--- drivers/iommu/iommufd/iommufd_private.h | 5 ++++- 3 files changed, 30 insertions(+), 5 deletions(-) diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index 5c352807d946..19cd6df46c6a 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -558,7 +558,7 @@ iommufd_device_auto_get_domain(struct iommufd_device *idev, } hwpt = iommufd_hw_pagetable_alloc(idev->ictx, ioas, idev, - immediate_attach); + NULL, NULL, immediate_attach); if (IS_ERR(hwpt)) { destroy_hwpt = ERR_CAST(hwpt); goto out_unlock; diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c index 84b4a11e62f8..16e92a1c150b 100644 --- a/drivers/iommu/iommufd/hw_pagetable.c +++ b/drivers/iommu/iommufd/hw_pagetable.c @@ -24,6 +24,8 @@ void iommufd_hw_pagetable_destroy(struct iommufd_object *obj) if (hwpt->domain) iommu_domain_free(hwpt->domain); + if (hwpt->parent) + refcount_dec(&hwpt->parent->obj.users); refcount_dec(&hwpt->ioas->obj.users); } @@ -46,6 +48,8 @@ int iommufd_hw_pagetable_enforce_cc(struct iommufd_hw_pagetable *hwpt) * @ictx: iommufd context * @ioas: IOAS to associate the domain with * @idev: Device to get an iommu_domain for + * @parent: Optional parent HWPT to associate with the domain with + * @user_data: Optional user_data pointer * @immediate_attach: True if idev should be attached to the hwpt * * Allocate a new iommu_domain and return it as a hw_pagetable. The HWPT @@ -54,14 +58,20 @@ int iommufd_hw_pagetable_enforce_cc(struct iommufd_hw_pagetable *hwpt) */ struct iommufd_hw_pagetable * iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas, - struct iommufd_device *idev, bool immediate_attach) + struct iommufd_device *idev, + struct iommufd_hw_pagetable *parent, + void *user_data, bool immediate_attach) { const struct iommu_ops *ops = dev_iommu_ops(idev->dev); + struct iommu_domain *parent_domain = NULL; struct iommufd_hw_pagetable *hwpt; int rc; lockdep_assert_held(&ioas->mutex); + if (parent && !ops->domain_alloc_user) + return ERR_PTR(-EOPNOTSUPP); + hwpt = iommufd_object_alloc(ictx, hwpt, IOMMUFD_OBJ_HW_PAGETABLE); if (IS_ERR(hwpt)) return hwpt; @@ -70,9 +80,15 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas, /* Pairs with iommufd_hw_pagetable_destroy() */ refcount_inc(&ioas->obj.users); hwpt->ioas = ioas; + if (parent) { + hwpt->parent = parent; + parent_domain = parent->domain; + refcount_inc(&parent->obj.users); + } if (ops->domain_alloc_user) - hwpt->domain = ops->domain_alloc_user(idev->dev, NULL, NULL); + hwpt->domain = ops->domain_alloc_user(idev->dev, + parent_domain, user_data); else hwpt->domain = iommu_domain_alloc(idev->dev->bus); if (!hwpt->domain) { @@ -80,6 +96,11 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas, goto out_abort; } + /* It must be either NESTED or UNMANAGED, depending on parent_domain */ + if ((parent_domain && hwpt->domain->type != IOMMU_DOMAIN_NESTED) || + (!parent_domain && hwpt->domain->type != IOMMU_DOMAIN_UNMANAGED)) + goto out_abort; + /* * Set the coherency mode before we do iopt_table_add_domain() as some * iommus have a per-PTE bit that controls it and need to decide before @@ -150,7 +171,8 @@ int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd) } mutex_lock(&ioas->mutex); - hwpt = iommufd_hw_pagetable_alloc(ucmd->ictx, ioas, idev, false); + hwpt = iommufd_hw_pagetable_alloc(ucmd->ictx, ioas, idev, + NULL, NULL, false); mutex_unlock(&ioas->mutex); if (IS_ERR(hwpt)) { rc = PTR_ERR(hwpt); diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index 05b5ad66f716..182c074eecdc 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -243,6 +243,7 @@ int iommufd_vfio_ioas(struct iommufd_ucmd *ucmd); */ struct iommufd_hw_pagetable { struct iommufd_object obj; + struct iommufd_hw_pagetable *parent; struct iommufd_ioas *ioas; struct iommu_domain *domain; bool auto_domain : 1; @@ -254,7 +255,9 @@ struct iommufd_hw_pagetable { struct iommufd_hw_pagetable * iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas, - struct iommufd_device *idev, bool immediate_attach); + struct iommufd_device *idev, + struct iommufd_hw_pagetable *parent, + void *user_data, bool immediate_attach); int iommufd_hw_pagetable_enforce_cc(struct iommufd_hw_pagetable *hwpt); int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt, struct iommufd_device *idev);