From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.17]) (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 0F5A6411680 for ; Tue, 4 Aug 2026 02:48:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785811720; cv=none; b=dX8GPnnRfs9Ez7ohE+Ji2Ef2WgYGvWxN3Ta4qYUDZHta+F6uvIjjZdRhhMwIjfaH6VkU+S3DErEq8samM5x6jmHKYD2+Hibk3EehiOo8bqrODYHl5HQJhQOK9T5Tzw3F0sofml4uW9PhLmEha8STFepTqJnS8ceMNfDqwZsOZXI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785811720; c=relaxed/simple; bh=RHtZyNIndU8qQJD0heWZbkAT4r7eUBHP8fHD/4aUctk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nptdubnBavlPp0xBOuKAby8vnkKCMURS9AowLyQNKq6b/h1hpCaf19pQFVwqFvtZTxEZ8VfhngB/CcZobbfbjP7OlQqRYxUW3Jrv/7luvXo51+RHt1ZcelRnsYTaN/7Rp7aa8iGT1faD1ubJ/5W+gAy5ZrqLT/HnijS1XoAjIVw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=YfrpFZIa; arc=none smtp.client-ip=192.198.163.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass 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="YfrpFZIa" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1785811717; x=1817347717; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=RHtZyNIndU8qQJD0heWZbkAT4r7eUBHP8fHD/4aUctk=; b=YfrpFZIa0xq2lHubKdCoJjpDUl7eNyeUA3CnPxGbEMW2YRFzcV5/ss/T DCbUD7kYnxfxLAWqOssujHPXlLZsmy+F4CKiIpXDD7yCRTFN9rw8EIiet nUB6r3WPYVGkAuY4onI4IhIOxwq8IEUh1N+QI9gRK7yPRJyl9Bb2irquF o6fXw7gn4X+b4s+0f0uGN0l0Mz6Gvij1Al22GRIRj6iNTltBLkNfeQhl3 n9K3Mz17FaswmWvM1U9TB4JZpVWkMBLEk2aNhPk9J7so7yDDS1TRR/kdn im+MBhf/i8s+725YEHZcysFCGpgaogm6Mv7bHDvJpW/mo30T8yGlGCC+X A==; X-CSE-ConnectionGUID: GaXQ0gc/TqC+2ZqbSjRrow== X-CSE-MsgGUID: FhNfdHlSRYSUWV71zU7Lsg== X-IronPort-AV: E=McAfee;i="6800,10657,11864"; a="86231259" X-IronPort-AV: E=Sophos;i="6.25,203,1779174000"; d="scan'208";a="86231259" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Aug 2026 19:48:37 -0700 X-CSE-ConnectionGUID: GbvbnbJHQsa7s/Nbn+d5Wg== X-CSE-MsgGUID: YMBsVD3wTjiXZ+fk1z5kxA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,203,1779174000"; d="scan'208";a="259587481" Received: from allen-box.sh.intel.com ([10.239.159.52]) by orviesa006.jf.intel.com with ESMTP; 03 Aug 2026 19:48:35 -0700 From: Lu Baolu To: Joerg Roedel Cc: ZhaoJinming , Kevin Tian , Dmitry Antipov , Guanghui Feng , Li RongQing , Desnes Nunes , iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 06/20] iommu/vt-d: Force requesting ACS when tboot is enabled Date: Tue, 4 Aug 2026 10:37:00 +0800 Message-ID: <20260804023714.3080506-7-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260804023714.3080506-1-baolu.lu@linux.intel.com> References: <20260804023714.3080506-1-baolu.lu@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Kevin Tian Currently the conditions of requesting ACS in detect_intel_iommu() don't include tboot, leading to a possible misconfiguration with ACS disabled (e.g. due to user opts) while iommu is later forced on by tboot_force_iommu(). Fix it by checking tboot in detect_intel_iommu(). Fixes: 5d990b627537 ("PCI: add pci_request_acs") Cc: stable@vger.kernel.org Signed-off-by: Kevin Tian Signed-off-by: Lu Baolu --- drivers/iommu/intel/iommu.h | 2 ++ drivers/iommu/intel/dmar.c | 15 +++++++++++++-- drivers/iommu/intel/iommu.c | 2 +- 3 files changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h index 775f1c4ae346..2cee36138d6e 100644 --- a/drivers/iommu/intel/iommu.h +++ b/drivers/iommu/intel/iommu.h @@ -1354,6 +1354,7 @@ static inline bool ecmd_has_pmu_essential(struct intel_iommu *iommu) extern int dmar_disabled; extern int intel_iommu_enabled; +extern int intel_iommu_tboot_noforce; #else static inline int iommu_calculate_agaw(struct intel_iommu *iommu) { @@ -1366,6 +1367,7 @@ static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu) #define dmar_disabled (1) #define intel_iommu_enabled (0) #define intel_iommu_sm (0) +#define intel_iommu_tboot_noforce (0) #endif static inline const char *decode_prq_descriptor(char *str, size_t size, diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c index 767ec092accd..e32685402f74 100644 --- a/drivers/iommu/intel/dmar.c +++ b/drivers/iommu/intel/dmar.c @@ -915,6 +915,18 @@ dmar_validate_one_drhd(struct acpi_dmar_header *entry, void *arg) return 0; } +static bool dmar_required(void) +{ + /* tboot supersedes any user/platform opt */ + if (!intel_iommu_tboot_noforce && tboot_enabled()) + return true; + + if (!no_iommu && (!dmar_disabled || dmar_platform_optin())) + return true; + + return false; +} + void __init detect_intel_iommu(void) { int ret; @@ -928,8 +940,7 @@ void __init detect_intel_iommu(void) if (!ret) ret = dmar_walk_dmar_table((struct acpi_table_dmar *)dmar_tbl, &validate_drhd_cb); - if (!ret && !no_iommu && !iommu_detected && - (!dmar_disabled || dmar_platform_optin())) { + if (!ret && !iommu_detected && dmar_required()) { iommu_detected = 1; /* Make sure ACS will be enabled */ pci_request_acs(); diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 1a1f27a51063..4d03d9a517de 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -57,7 +57,7 @@ static int rwbf_quirk; * (used when kernel is launched w/ TXT) */ static int force_on = 0; -static int intel_iommu_tboot_noforce; +int intel_iommu_tboot_noforce; static int no_platform_optin; #define ROOT_ENTRY_NR (VTD_PAGE_SIZE/sizeof(struct root_entry)) -- 2.43.0