From patchwork Tue Oct 24 15:06:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13434742 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 9556BC25B6C for ; Tue, 24 Oct 2023 15:09:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232262AbjJXPJf (ORCPT ); Tue, 24 Oct 2023 11:09:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45138 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232314AbjJXPJd (ORCPT ); Tue, 24 Oct 2023 11:09:33 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CDF5F122; Tue, 24 Oct 2023 08:09:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1698160172; x=1729696172; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=3/cuCSmPN9+p1ALZO3N9FNZbz6Rb0G3ZJUXiS9lXF40=; b=MGcCk8CgVoZpxfkBjxoJWyHGWxwAvNdC+bU1LzdxD7eIv/qMAPieXP9E LkNGPo2/ScSm7toDMuelTLgXtZax/DAnT3IqwZfrFl3eVh4na0MwaD8XS SoxTubtantL+LAhDyhyL/n1I+WY6Wcde4YpnwEk4xgUyB8uQkL7KAm4ul NhPvstEMlHmYyjQ2Z4dPEQfEsHBPYinqPtREZYt4Ti7wgTyORIJxqVopN 8iiglGaLXZKiIK+S58rSUXOYKXI7TC8Y1AdL2tQgVOiTPDzVAaCkiC+fg hjiECRQH571EbxKTP4yhdlpOxgrIseRntUCsWjE/YMwloVPztqlksvShP Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10873"; a="418202791" X-IronPort-AV: E=Sophos;i="6.03,248,1694761200"; d="scan'208";a="418202791" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Oct 2023 08:06:14 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.03,248,1694761200"; d="scan'208";a="6486144" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by fmviesa001.fm.intel.com with ESMTP; 24 Oct 2023 08:06:06 -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 Subject: [PATCH v6 01/10] iommu: Add IOMMU_DOMAIN_NESTED Date: Tue, 24 Oct 2023 08:06:00 -0700 Message-Id: <20231024150609.46884-2-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231024150609.46884-1-yi.l.liu@intel.com> References: <20231024150609.46884-1-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 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 1d42bdb37cbc..becfc8b725de 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 << 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 @@ -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;