From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.12]) (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 62ECD224B05 for ; Fri, 24 Oct 2025 02:04:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761271460; cv=none; b=pq7bsPk3ba2nQHOeQf6gR0goDs3/exquBtXsBnu3CPYJoYuHT6sQMLGoF/eg1WxUevH957YpCb/m62FN0etwM0mpu/eVSI0X89yZSxJeyExigBmN73hdxoyb4iZNvJlC0aG/JNMPsxl6kna42xEujlj6xSxnYS12VMKF3JVs6i8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761271460; c=relaxed/simple; bh=f/x+kuFZDW8+S+hAF69IPN9s4MbxddWK4kKJjnjuy28=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GsJHqR8Ph2hxM6267d7sEK+EV131SIdhrxTKSKQXUhITDC1PMYDePMx0H727l29wqYjSUIXxGIhTU5YSjIkpc+5/SG2ZeW7R8t6u3pJ/g2kYRvFpbt5VKkk6dHySOAlKDanB+qmNbBZFi3JIFzIAZjN0HSJjWyLgTrQtjWOpTpU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=j0Jo3StP; arc=none smtp.client-ip=192.198.163.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="j0Jo3StP" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1761271459; x=1792807459; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=f/x+kuFZDW8+S+hAF69IPN9s4MbxddWK4kKJjnjuy28=; b=j0Jo3StPazmjauYOSUIDefOg1zBAZBuhuCkZkzplkWUgJ5E9MD6WzVEB hkS1i+MopKQ+M3l2vfmE3B0Ggs8CzYkNOY/6qS9ENcBsqzqAc1BJGo5tT asV0DBrngLTdNDYv1xDw9cDrE/opCglKKPdqQ2k3WAbSZnsrzUiGJk7FB mRXv6wQnEVh0asoKwDpmJ2QhPk/IfWsGTn+OyVE/X0B7yAC/58U8iQewJ 5XOk23NVvto2ys8/rccx87WUsP/WpzZqCajwNWgpYlts55ShuhXKgYknh fcJYg2QyhzFoFA7vrkCFVom1H2eTznCyjoN3dKcTPw7HAXUvY62fqApH4 Q==; X-CSE-ConnectionGUID: d5hkvUYOSvOpz3c4Sw8PmA== X-CSE-MsgGUID: 92Vd2LvCRwacDIju+NoKLw== X-IronPort-AV: E=McAfee;i="6800,10657,11586"; a="67319368" X-IronPort-AV: E=Sophos;i="6.19,251,1754982000"; d="scan'208";a="67319368" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Oct 2025 19:04:17 -0700 X-CSE-ConnectionGUID: HgH6Q+mRR622r1OJr/pjgg== X-CSE-MsgGUID: xGpNHt67RGCPZdoOxBcTTw== X-ExtLoop1: 1 Received: from dwillia2-desk.jf.intel.com ([10.88.27.145]) by fmviesa003.fm.intel.com with ESMTP; 23 Oct 2025 19:04:16 -0700 From: Dan Williams To: linux-coco@lists.linux.dev, linux-pci@vger.kernel.org Cc: aik@amd.com, yilun.xu@linux.intel.com, aneesh.kumar@kernel.org, bhelgaas@google.com, gregkh@linuxfoundation.org, Jonathan Cameron Subject: [PATCH v7 1/9] coco/tsm: Introduce a core device for TEE Security Managers Date: Thu, 23 Oct 2025 19:04:10 -0700 Message-ID: <20251024020418.1366664-2-dan.j.williams@intel.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251024020418.1366664-1-dan.j.williams@intel.com> References: <20251024020418.1366664-1-dan.j.williams@intel.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit A "TSM" is a platform component that provides an API for securely provisioning resources for a confidential guest (TVM) to consume. The name originates from the PCI specification for platform agent that carries out operations for PCIe TDISP (TEE Device Interface Security Protocol). Instances of this core device are parented by a device representing the platform security function like CONFIG_CRYPTO_DEV_CCP or CONFIG_INTEL_TDX_HOST. This device interface is a frontend to the aspects of a TSM and TEE I/O that are cross-architecture common. This includes mechanisms like enumerating available platform TEE I/O capabilities and provisioning connections between the platform TSM and device DSMs (Device Security Manager (TDISP)). For now this is just the scaffolding for registering a TSM device sysfs interface. Cc: Alexey Kardashevskiy Cc: Xu Yilun Reviewed-by: Jonathan Cameron Co-developed-by: Aneesh Kumar K.V (Arm) Signed-off-by: Aneesh Kumar K.V (Arm) Acked-by: Bjorn Helgaas Signed-off-by: Dan Williams --- drivers/virt/coco/Kconfig | 3 + drivers/virt/coco/Makefile | 1 + Documentation/ABI/testing/sysfs-class-tsm | 9 ++ include/linux/tsm.h | 4 + drivers/virt/coco/tsm-core.c | 109 ++++++++++++++++++++++ MAINTAINERS | 2 +- 6 files changed, 127 insertions(+), 1 deletion(-) create mode 100644 Documentation/ABI/testing/sysfs-class-tsm create mode 100644 drivers/virt/coco/tsm-core.c diff --git a/drivers/virt/coco/Kconfig b/drivers/virt/coco/Kconfig index 819a97e8ba99..bb0c6d6ddcc8 100644 --- a/drivers/virt/coco/Kconfig +++ b/drivers/virt/coco/Kconfig @@ -14,3 +14,6 @@ source "drivers/virt/coco/tdx-guest/Kconfig" source "drivers/virt/coco/arm-cca-guest/Kconfig" source "drivers/virt/coco/guest/Kconfig" + +config TSM + bool diff --git a/drivers/virt/coco/Makefile b/drivers/virt/coco/Makefile index f918bbb61737..cb52021912b3 100644 --- a/drivers/virt/coco/Makefile +++ b/drivers/virt/coco/Makefile @@ -7,4 +7,5 @@ obj-$(CONFIG_ARM_PKVM_GUEST) += pkvm-guest/ obj-$(CONFIG_SEV_GUEST) += sev-guest/ obj-$(CONFIG_INTEL_TDX_GUEST) += tdx-guest/ obj-$(CONFIG_ARM_CCA_GUEST) += arm-cca-guest/ +obj-$(CONFIG_TSM) += tsm-core.o obj-$(CONFIG_TSM_GUEST) += guest/ diff --git a/Documentation/ABI/testing/sysfs-class-tsm b/Documentation/ABI/testing/sysfs-class-tsm new file mode 100644 index 000000000000..2949468deaf7 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-tsm @@ -0,0 +1,9 @@ +What: /sys/class/tsm/tsmN +Contact: linux-coco@lists.linux.dev +Description: + "tsmN" is a device that represents the generic attributes of a + platform TEE Security Manager. It is typically a child of a + platform enumerated TSM device. /sys/class/tsm/tsmN/uevent + signals when the PCI layer is able to support establishment of + link encryption and other device-security features coordinated + through a platform tsm. diff --git a/include/linux/tsm.h b/include/linux/tsm.h index 431054810dca..aa906eb67360 100644 --- a/include/linux/tsm.h +++ b/include/linux/tsm.h @@ -5,6 +5,7 @@ #include #include #include +#include #define TSM_REPORT_INBLOB_MAX 64 #define TSM_REPORT_OUTBLOB_MAX SZ_32K @@ -109,4 +110,7 @@ struct tsm_report_ops { int tsm_report_register(const struct tsm_report_ops *ops, void *priv); int tsm_report_unregister(const struct tsm_report_ops *ops); +struct tsm_dev; +struct tsm_dev *tsm_register(struct device *parent); +void tsm_unregister(struct tsm_dev *tsm_dev); #endif /* __TSM_H */ diff --git a/drivers/virt/coco/tsm-core.c b/drivers/virt/coco/tsm-core.c new file mode 100644 index 000000000000..a64b776642cf --- /dev/null +++ b/drivers/virt/coco/tsm-core.c @@ -0,0 +1,109 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright(c) 2024 Intel Corporation. All rights reserved. */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include + +static struct class *tsm_class; +static DECLARE_RWSEM(tsm_rwsem); +static DEFINE_IDR(tsm_idr); + +struct tsm_dev { + struct device dev; + int id; +}; + +static struct tsm_dev *alloc_tsm_dev(struct device *parent) +{ + struct tsm_dev *tsm_dev __free(kfree) = + kzalloc(sizeof(*tsm_dev), GFP_KERNEL); + struct device *dev; + int id; + + if (!tsm_dev) + return ERR_PTR(-ENOMEM); + + guard(rwsem_write)(&tsm_rwsem); + id = idr_alloc(&tsm_idr, tsm_dev, 0, INT_MAX, GFP_KERNEL); + if (id < 0) + return ERR_PTR(id); + + tsm_dev->id = id; + dev = &tsm_dev->dev; + dev->parent = parent; + dev->class = tsm_class; + device_initialize(dev); + return no_free_ptr(tsm_dev); +} + +static void put_tsm_dev(struct tsm_dev *tsm_dev) +{ + if (!IS_ERR_OR_NULL(tsm_dev)) + put_device(&tsm_dev->dev); +} + +DEFINE_FREE(put_tsm_dev, struct tsm_dev *, + if (!IS_ERR_OR_NULL(_T)) put_tsm_dev(_T)) + +struct tsm_dev *tsm_register(struct device *parent) +{ + struct tsm_dev *tsm_dev __free(put_tsm_dev) = alloc_tsm_dev(parent); + struct device *dev; + int rc; + + if (IS_ERR(tsm_dev)) + return tsm_dev; + + dev = &tsm_dev->dev; + rc = dev_set_name(dev, "tsm%d", tsm_dev->id); + if (rc) + return ERR_PTR(rc); + + rc = device_add(dev); + if (rc) + return ERR_PTR(rc); + + return no_free_ptr(tsm_dev); +} +EXPORT_SYMBOL_GPL(tsm_register); + +void tsm_unregister(struct tsm_dev *tsm_dev) +{ + device_unregister(&tsm_dev->dev); +} +EXPORT_SYMBOL_GPL(tsm_unregister); + +static void tsm_release(struct device *dev) +{ + struct tsm_dev *tsm_dev = container_of(dev, typeof(*tsm_dev), dev); + + guard(rwsem_write)(&tsm_rwsem); + idr_remove(&tsm_idr, tsm_dev->id); + kfree(tsm_dev); +} + +static int __init tsm_init(void) +{ + tsm_class = class_create("tsm"); + if (IS_ERR(tsm_class)) + return PTR_ERR(tsm_class); + + tsm_class->dev_release = tsm_release; + return 0; +} +module_init(tsm_init) + +static void __exit tsm_exit(void) +{ + class_destroy(tsm_class); +} +module_exit(tsm_exit) + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("TEE Security Manager Class Device"); diff --git a/MAINTAINERS b/MAINTAINERS index 545a4776795e..06285f3a24df 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -26097,7 +26097,7 @@ M: David Lechner S: Maintained F: Documentation/devicetree/bindings/trigger-source/* -TRUSTED SECURITY MODULE (TSM) INFRASTRUCTURE +TRUSTED EXECUTION ENVIRONMENT SECURITY MANAGER (TSM) M: Dan Williams L: linux-coco@lists.linux.dev S: Maintained -- 2.51.0