From patchwork Thu Oct 26 04:39:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13437226 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 738B2C25B6D for ; Thu, 26 Oct 2023 04:39:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233221AbjJZEjt (ORCPT ); Thu, 26 Oct 2023 00:39:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36642 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233048AbjJZEjp (ORCPT ); Thu, 26 Oct 2023 00:39:45 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.7]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 50E4018C; Wed, 25 Oct 2023 21:39:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1698295184; x=1729831184; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=UOhGIFSVU2siqA4+T4Fh3zBHdDxssB2+XzHFtkW1ZL4=; b=kQylrdeAzzBFSaVC921L20VumYFGNWGC/y2Uk1VtFj+e1AWWaH0JxuMz PMAWRhy03loSJKLVVavbMBx3F3bC8o8sM0XR/cPhAevPjdJnBWukyhpP7 JBtBGz2zIttRiWtW7Q1TsK7rUibUx2WKWrvZKXpXklOyA4IzXygSc/34i olaZw8Y+N4X6yb/80FTS8PEIfIAiktmCIOAhE1WrKjuTNkmBgfP5Atw+C 0aXsN50T4Jos/1EJIFUzNUE4G9xHgDXMIX5NLE9WB1m1mRB+QLCRgVWsa VerBp/W7slwrIV+x21dlE7T83P/OSioIniMNMZnmaWO4Rx9LV5MrgbIh/ g==; X-IronPort-AV: E=McAfee;i="6600,9927,10874"; a="9014407" X-IronPort-AV: E=Sophos;i="6.03,252,1694761200"; d="scan'208";a="9014407" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Oct 2023 21:39:41 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10874"; a="708931229" X-IronPort-AV: E=Sophos;i="6.03,252,1694761200"; d="scan'208";a="708931229" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by orsmga003.jf.intel.com with ESMTP; 25 Oct 2023 21:39:40 -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 v7 01/10] iommu: Add IOMMU_DOMAIN_NESTED Date: Wed, 25 Oct 2023 21:39:29 -0700 Message-Id: <20231026043938.63898-2-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231026043938.63898-1-yi.l.liu@intel.com> References: <20231026043938.63898-1-yi.l.liu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@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 Signed-off-by: Nicolin Chen Signed-off-by: Yi Liu Reviewed-by: Kevin Tian Reviewed-by: Jason Gunthorpe Signed-off-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 1d42bdb37cbc..bc303cb2af37 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -67,6 +67,9 @@ struct iommu_domain_geometry { #define __IOMMU_DOMAIN_SVA (1U << 4) /* Shared process address space */ +#define __IOMMU_DOMAIN_NESTED (1U << 6) /* 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 @@ -93,6 +96,7 @@ 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;