From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) (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 36E2B12E7E for ; Fri, 9 Aug 2024 05:58:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723183086; cv=none; b=NbP2j7nL0Hleq+GFSQ9E25aafGwAe5V6aHz9qV9S9S7iWfiBzFs8QMcv//qhxG66Vd/Ne0xd8Lx+w0qCkWvrNN5j60T1DObMXBtmoYXw3jdCsWBIpGCozYSojN+FMf9onTxQkCVWgUGvQGNjOxz3+78PgvX3tbNo63OjALfFyZs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723183086; c=relaxed/simple; bh=EjNUO1G8fUoOFyVU7/LcFACMKocJfSk95eUy2roxy1Y=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=S1KXzdGggBgkrQe8cBkoH7Ger8LEBNH48njR9itMcMD7ndKZLNtqRhrdWD2MRylwfN0eROOm3kUVnrpdL2beNXJ/DZ0T/vcQQogIKn3LQJP5uuYrqgGX8rNa5f9/BjfqF8EiLPRGM19j/YNMT3RlxRml3t/gmO5hX+ooNelP0wc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Fr9ITUW+; arc=none smtp.client-ip=198.175.65.17 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="Fr9ITUW+" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1723183084; x=1754719084; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=EjNUO1G8fUoOFyVU7/LcFACMKocJfSk95eUy2roxy1Y=; b=Fr9ITUW+HEwNJur2/5fz80IrzydwbfkR1v46hvqJyoqL/xRVCtVZ1Oqn AeGUuL07/OOE8FrPkbd6imeQkNt4YC5jIXWeNAChLLmRo5kOBoNaMsN6n bHiYvpe29KB8Z/DzaOKyRm9MmMagXDRu2036pJitDF1z96hAIyzlWOYhl Zlhzg1sjgOnRjmCw0ekOZpSdAU0L8rzfdSoxL3rbOkHwYzvHQaHKPpCje uNFxTr+4YnObJjXlQRtT1ebhlFniiw62o8xz9apt0e9Qbu0zbYbVe7Fgh k63tZYULEcV9Wpw0GXXHKnKgKMIZENOy2K2zUlxiZ9TckJjPlB4R8lDFW A==; X-CSE-ConnectionGUID: oWHs9f+FRbeqZmu52MAQ7w== X-CSE-MsgGUID: hbdT6imhRf6rzNcwG+Bn4w== X-IronPort-AV: E=McAfee;i="6700,10204,11158"; a="21469106" X-IronPort-AV: E=Sophos;i="6.09,275,1716274800"; d="scan'208";a="21469106" Received: from fmviesa010.fm.intel.com ([10.60.135.150]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Aug 2024 22:58:03 -0700 X-CSE-ConnectionGUID: osZSMV3mS3myNWtMYFUlYQ== X-CSE-MsgGUID: MbrogYbtRT2iNamRqRZ5dQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,275,1716274800"; d="scan'208";a="57540850" Received: from allen-box.sh.intel.com ([10.239.159.127]) by fmviesa010.fm.intel.com with ESMTP; 08 Aug 2024 22:58:00 -0700 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 v4 0/7] iommu/vt-d: Convert to use static identity domain Date: Fri, 9 Aug 2024 13:54:24 +0800 Message-Id: <20240809055431.36513-1-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org 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 available at https://github.com/LuBaolu/intel-iommu/commits/vtd-static-identity-domain-v4 Change log: v4: - Add a new patch to remove has_iotlb_device flag as suggested by Jason. https://lore.kernel.org/linux-iommu/20240807121712.GD8473@ziepe.ca/ v3: https://lore.kernel.org/linux-iommu/20240806023941.93454-1-baolu.lu@linux.intel.com/ - Kevin worried that some graphic devices might still require identity domain. Forcing DMA domain for those drivers might break the existing functionality. https://lore.kernel.org/linux-iommu/BN9PR11MB52761FF9AB496B422596DDDF8C8AA@BN9PR11MB5276.namprd11.prod.outlook.com/ After confirmed with the graphic community, we decouple "igfx_off" kernel command from graphic identity mapping with the following commits: ba00196ca41c ("iommu/vt-d: Decouple igfx_off from graphic identity mapping") 4b8d18c0c986 ("iommu/vt-d: Remove INTEL_IOMMU_BROKEN_GFX_WA"). v2: https://lore.kernel.org/linux-iommu/20231205012203.244584-1-baolu.lu@linux.intel.com/ - 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 (7): iommu/vt-d: Require DMA domain if hardware not support passthrough iommu/vt-d: Remove identity mappings from si_domain iommu/vt-d: Always reserve a domain ID for identity setup iommu/vt-d: Remove has_iotlb_device flag iommu/vt-d: Factor out helpers from domain_context_mapping_one() iommu/vt-d: Add support for static identity domain iommu/vt-d: Cleanup si_domain drivers/iommu/intel/iommu.h | 2 - drivers/iommu/intel/iommu.c | 468 +++++++++++++++-------------------- drivers/iommu/intel/nested.c | 2 - 3 files changed, 201 insertions(+), 271 deletions(-) -- 2.34.1