From mboxrd@z Thu Jan 1 00:00:00 1970 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 219D0C54E76 for ; Mon, 20 Nov 2023 11:34:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233192AbjKTLeX (ORCPT ); Mon, 20 Nov 2023 06:34:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43960 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233199AbjKTLeU (ORCPT ); Mon, 20 Nov 2023 06:34:20 -0500 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F3D29C for ; Mon, 20 Nov 2023 03:34:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1700480057; x=1732016057; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=OrCX94Gi20FAuTMva6n9USU5rVLYqIjivGDRZZq68Ic=; b=ZvVKTsZqTZ5DWApeY+N2KZL7HkNXCmvxfL807PQp/Cx78vwjnrZxCKt0 lvECBzLCGug92CQFUupBZmlQ79iwGAzDmbLgJB4P4AfQ4K4xk7VcwFOnd c7yQpV43UdCVuloUOYcblkD6QsYuzzlktf3G6wj86/v/JLW01ecozl1cJ BRsNIlVdUwx547OhnhzhYQqy6ZBLElzxY9KIuCqHj6cnjQaiF7JkPdZlW NHTIYvqObQwr16UM4GIPlzr2FxiTF0O2yjknFPjpo0jClnVTTDrNgiG9o tWbbktzkLhCRX85nDqYMBDzcjxF+OIbYLRYAK+XgIw+8krAbrgZxdQxMn Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10899"; a="376634963" X-IronPort-AV: E=Sophos;i="6.04,213,1695711600"; d="scan'208";a="376634963" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Nov 2023 03:34:05 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10899"; a="856963592" X-IronPort-AV: E=Sophos;i="6.04,213,1695711600"; d="scan'208";a="856963592" Received: from allen-box.sh.intel.com ([10.239.159.127]) by FMSMGA003.fm.intel.com with ESMTP; 20 Nov 2023 03:34:03 -0800 From: Lu Baolu To: Joerg Roedel , Will Deacon , Robin Murphy , Jason Gunthorpe , Kevin Tian Cc: iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH 0/5] iommu/vt-d: Convert to use static identity domain Date: Mon, 20 Nov 2023 19:29:39 +0800 Message-Id: <20231120112944.142741-1-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Intel's IOMMU driver used a special domain called 1:1 mapping domain to support the domain of type IOMMU_DOMAIN_IDENTITY, which enables device drivers to directly utilize physical addresses for DMA access despite the presence of IOMMU units. The implementation of the 1:1 mapping domain is influenced by hardware differences. While modern Intel VT-d implementations support hardware passthrough translation mode, earlier versions lacked this feature, which requires a more complex implementation approach. The 1:1 mapping domain for earlier hardware was implemented by associating a DMA domain with an IOVA (IO Virtual Address) equivalent to the physical address. While, for most hardware supporting passthrough mode, simply setting the hardware's passthrough mode is sufficient. These two modes were merged together in si_domain, which is a special DMA domain sharing the domain ops of an ordinary DMA domain. As the iommu core has evolved, it has introduced global static identity domain with "never fail" attach semantics. This means that the domain is always available and cannot fail to attach. The iommu driver now assigns this domain directly at iommu_ops->identity_domain instead of allocating it through the domain allocation interface. This converts the Intel IOMMU driver to embrace the global static identity domain. For early legacy hardwares that don't support passthrough translation mode, ask the iommu core to use a DMA type of default domain. For modern hardwares that support passthrough translation mode, implement a static global identity domain. The whole series is also avaiable at https://github.com/LuBaolu/intel-iommu/commits/vtd-static-identity-domain-v1 Very appreciated for your review comments and suggestions. Lu Baolu (5): iommu/vt-d: Setup scalable mode context entry in probe path iommu/vt-d: Remove scalable mode context entry setup from attach_dev iommu/vt-d: Refactor domain_context_mapping_one() to be reusable iommu/vt-d: Add support for static identity domain iommu/vt-d: Remove si_domain drivers/iommu/intel/pasid.h | 1 + drivers/iommu/intel/iommu.c | 565 +++++++++++++++--------------------- drivers/iommu/intel/pasid.c | 180 ++++++++++++ drivers/iommu/intel/svm.c | 2 +- 4 files changed, 414 insertions(+), 334 deletions(-) -- 2.34.1