From patchwork Fri Oct 20 09:19:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13430332 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 13130CDB474 for ; Fri, 20 Oct 2023 09:20:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376552AbjJTJUB (ORCPT ); Fri, 20 Oct 2023 05:20:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42600 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376647AbjJTJT7 (ORCPT ); Fri, 20 Oct 2023 05:19:59 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B1127D6B; Fri, 20 Oct 2023 02:19:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1697793597; x=1729329597; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=pw4CXcAB+7pwTGUAZedG47AYASIyAmD8xc7RBFXXQaw=; b=M1hyzteGZ++pCmeyOckTCUmHrL4tREeDlm4weqlCtnoDE6bUpsDVCczs qUFdKqrslDeaO0GSoKuiNeK75D1SD7nULgkeIxViS/PAnn902QwubqqNH k4rjR5OQeavwFGh1lzn/NTWuqDaGk47w1AJfcC0sVsnYVmVXa55JyBJbi Dg1RRTu7cvMW2znsEIrWueodyrM7DjB/vTLtwOEsg5F6Dqba/mGg4HNrQ XQG/I0NJ7mmb68SiXHvApz8/cNEvVEpz9M5IigNp6UpILT3l3pi/E7XTz jOh+I/y2IosFMu5/rXN9f624wisopLTfo6HlMkaCW5KtRB1CSq68Rx2UD w==; X-IronPort-AV: E=McAfee;i="6600,9927,10868"; a="366693298" X-IronPort-AV: E=Sophos;i="6.03,238,1694761200"; d="scan'208";a="366693298" 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 02:19:57 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10868"; a="707179406" X-IronPort-AV: E=Sophos;i="6.03,238,1694761200"; d="scan'208";a="707179406" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by orsmga003.jf.intel.com with ESMTP; 20 Oct 2023 02:19:56 -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 01/10] iommu: Add IOMMU_DOMAIN_NESTED Date: Fri, 20 Oct 2023 02:19:37 -0700 Message-Id: <20231020091946.12173-2-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: Lu Baolu Introduce a new domain type for a user I/O page table, which is nested on top of another user space address represented by a PAGING domain. This new domain can be allocated by the domain_alloc_user op, and attached to a device through the existing iommu_attach_device/group() interfaces. The mappings of a nested domain are managed by user space software, so it is not necessary to have map/unmap callbacks. Signed-off-by: Lu Baolu Reviewed-by: Kevin Tian Signed-off-by: Nicolin Chen Signed-off-by: Yi Liu --- include/linux/iommu.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 3861d66b65c1..ce08a3c41446 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -65,6 +65,9 @@ struct iommu_domain_geometry { #define __IOMMU_DOMAIN_SVA (1U << 4) /* Shared process address space */ +#define __IOMMU_DOMAIN_NESTED (1U << 5) /* User-managed address space nested + on a stage-2 translation */ + #define IOMMU_DOMAIN_ALLOC_FLAGS ~__IOMMU_DOMAIN_DMA_FQ /* * This are the possible domain-types @@ -91,6 +94,7 @@ struct iommu_domain_geometry { __IOMMU_DOMAIN_DMA_API | \ __IOMMU_DOMAIN_DMA_FQ) #define IOMMU_DOMAIN_SVA (__IOMMU_DOMAIN_SVA) +#define IOMMU_DOMAIN_NESTED (__IOMMU_DOMAIN_NESTED) struct iommu_domain { unsigned type;