From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.100]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A36D71110 for ; Tue, 5 Dec 2023 01:26:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="dsdSO3FI" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1701739602; x=1733275602; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=Bkkpqs/4u4rtpGgvFYZ8AVk/jZfzha1HLmAg3v2cthU=; b=dsdSO3FIG0/ylEWmEqvSRJCdj/QpY93FuIN+YWrMvd5E6fKJu/nWYV0P ECCn2ZwIFkN9XmdmA61diZFaB/3MJ4mVPV/VlSdxQTt7iFC+VbsPTvHuk 7f1MRjE4iTYZuPGeM8Vh5Rf0WqGMYmqHuwOg06Q8X/UsjE+eXRkfzLX8l y9pD6vz0JhyWOoTAQcjJLEYZbIBkUcZvDzyQuztL+06T8D6ESZFDhJMfE +ya/iUTq5yESbzbYDJAbMnbl2ZaM9YKdNOOpSAv3Aj7pMpUn1qYn3MhBv N2Wmn1Uxpsm4w03cw9+C3osDJOjLzOLY08z93ODGPav+4qOmIw1NPNF4A g==; X-IronPort-AV: E=McAfee;i="6600,9927,10914"; a="460313326" X-IronPort-AV: E=Sophos;i="6.04,251,1695711600"; d="scan'208";a="460313326" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Dec 2023 17:26:41 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10914"; a="1102276164" X-IronPort-AV: E=Sophos;i="6.04,251,1695711600"; d="scan'208";a="1102276164" Received: from allen-box.sh.intel.com ([10.239.159.127]) by fmsmga005.fm.intel.com with ESMTP; 04 Dec 2023 17:26:39 -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 v2 0/6] iommu/vt-d: Convert to use static identity domain Date: Tue, 5 Dec 2023 09:21:57 +0800 Message-Id: <20231205012203.244584-1-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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-v2 Very appreciated for your review comments and suggestions. Change log: v2: - Re-orgnize the patches by removing 1:1 mappings before implementing global static domain. v1: https://lore.kernel.org/linux-iommu/20231120112944.142741-1-baolu.lu@linux.intel.com/ Lu Baolu (6): 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: Remove 1:1 mappings from identity domain iommu/vt-d: Add support for static identity domain iommu/vt-d: Cleanup si_domain drivers/iommu/intel/pasid.h | 1 + drivers/iommu/intel/iommu.c | 568 +++++++++++++++--------------------- drivers/iommu/intel/pasid.c | 180 ++++++++++++ drivers/iommu/intel/svm.c | 2 +- 4 files changed, 415 insertions(+), 336 deletions(-) -- 2.34.1