tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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coco/tsm: Introduce a core device for TEE Security Managers

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: Xu Yilun <yilun.xu@linux.intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Co-developed-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alexey Kardashevskiy <aik@amd.com>
Link: https://patch.msgid.link/20251031212902.2256310-2-dan.j.williams@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Dan Williams 603c646f 6146a0f1

+118 -1
+9
Documentation/ABI/testing/sysfs-class-tsm
··· 1 + What: /sys/class/tsm/tsmN 2 + Contact: linux-coco@lists.linux.dev 3 + Description: 4 + "tsmN" is a device that represents the generic attributes of a 5 + platform TEE Security Manager. It is typically a child of a 6 + platform enumerated TSM device. /sys/class/tsm/tsmN/uevent 7 + signals when the PCI layer is able to support establishment of 8 + link encryption and other device-security features coordinated 9 + through a platform tsm.
+1 -1
MAINTAINERS
··· 26112 26112 S: Maintained 26113 26113 F: Documentation/devicetree/bindings/trigger-source/* 26114 26114 26115 - TRUSTED SECURITY MODULE (TSM) INFRASTRUCTURE 26115 + TRUSTED EXECUTION ENVIRONMENT SECURITY MANAGER (TSM) 26116 26116 M: Dan Williams <dan.j.williams@intel.com> 26117 26117 L: linux-coco@lists.linux.dev 26118 26118 S: Maintained
+3
drivers/virt/coco/Kconfig
··· 14 14 source "drivers/virt/coco/arm-cca-guest/Kconfig" 15 15 16 16 source "drivers/virt/coco/guest/Kconfig" 17 + 18 + config TSM 19 + bool
+1
drivers/virt/coco/Makefile
··· 7 7 obj-$(CONFIG_SEV_GUEST) += sev-guest/ 8 8 obj-$(CONFIG_INTEL_TDX_GUEST) += tdx-guest/ 9 9 obj-$(CONFIG_ARM_CCA_GUEST) += arm-cca-guest/ 10 + obj-$(CONFIG_TSM) += tsm-core.o 10 11 obj-$(CONFIG_TSM_GUEST) += guest/
+93
drivers/virt/coco/tsm-core.c
··· 1 + // SPDX-License-Identifier: GPL-2.0-only 2 + /* Copyright(c) 2024-2025 Intel Corporation. All rights reserved. */ 3 + 4 + #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 5 + 6 + #include <linux/tsm.h> 7 + #include <linux/rwsem.h> 8 + #include <linux/device.h> 9 + #include <linux/module.h> 10 + #include <linux/cleanup.h> 11 + 12 + static struct class *tsm_class; 13 + static DECLARE_RWSEM(tsm_rwsem); 14 + static DEFINE_IDA(tsm_ida); 15 + 16 + static struct tsm_dev *alloc_tsm_dev(struct device *parent) 17 + { 18 + struct device *dev; 19 + int id; 20 + 21 + struct tsm_dev *tsm_dev __free(kfree) = 22 + kzalloc(sizeof(*tsm_dev), GFP_KERNEL); 23 + if (!tsm_dev) 24 + return ERR_PTR(-ENOMEM); 25 + 26 + id = ida_alloc(&tsm_ida, GFP_KERNEL); 27 + if (id < 0) 28 + return ERR_PTR(id); 29 + 30 + tsm_dev->id = id; 31 + dev = &tsm_dev->dev; 32 + dev->parent = parent; 33 + dev->class = tsm_class; 34 + device_initialize(dev); 35 + 36 + return no_free_ptr(tsm_dev); 37 + } 38 + 39 + struct tsm_dev *tsm_register(struct device *parent) 40 + { 41 + struct tsm_dev *tsm_dev __free(put_tsm_dev) = alloc_tsm_dev(parent); 42 + struct device *dev; 43 + int rc; 44 + 45 + if (IS_ERR(tsm_dev)) 46 + return tsm_dev; 47 + 48 + dev = &tsm_dev->dev; 49 + rc = dev_set_name(dev, "tsm%d", tsm_dev->id); 50 + if (rc) 51 + return ERR_PTR(rc); 52 + 53 + rc = device_add(dev); 54 + if (rc) 55 + return ERR_PTR(rc); 56 + 57 + return no_free_ptr(tsm_dev); 58 + } 59 + EXPORT_SYMBOL_GPL(tsm_register); 60 + 61 + void tsm_unregister(struct tsm_dev *tsm_dev) 62 + { 63 + device_unregister(&tsm_dev->dev); 64 + } 65 + EXPORT_SYMBOL_GPL(tsm_unregister); 66 + 67 + static void tsm_release(struct device *dev) 68 + { 69 + struct tsm_dev *tsm_dev = container_of(dev, typeof(*tsm_dev), dev); 70 + 71 + ida_free(&tsm_ida, tsm_dev->id); 72 + kfree(tsm_dev); 73 + } 74 + 75 + static int __init tsm_init(void) 76 + { 77 + tsm_class = class_create("tsm"); 78 + if (IS_ERR(tsm_class)) 79 + return PTR_ERR(tsm_class); 80 + 81 + tsm_class->dev_release = tsm_release; 82 + return 0; 83 + } 84 + module_init(tsm_init) 85 + 86 + static void __exit tsm_exit(void) 87 + { 88 + class_destroy(tsm_class); 89 + } 90 + module_exit(tsm_exit) 91 + 92 + MODULE_LICENSE("GPL"); 93 + MODULE_DESCRIPTION("TEE Security Manager Class Device");
+11
include/linux/tsm.h
··· 5 5 #include <linux/sizes.h> 6 6 #include <linux/types.h> 7 7 #include <linux/uuid.h> 8 + #include <linux/device.h> 8 9 9 10 #define TSM_REPORT_INBLOB_MAX 64 10 11 #define TSM_REPORT_OUTBLOB_MAX SZ_32K ··· 108 107 bool (*report_bin_attr_visible)(int n); 109 108 }; 110 109 110 + struct tsm_dev { 111 + struct device dev; 112 + int id; 113 + }; 114 + 115 + DEFINE_FREE(put_tsm_dev, struct tsm_dev *, 116 + if (!IS_ERR_OR_NULL(_T)) put_device(&_T->dev)) 117 + 111 118 int tsm_report_register(const struct tsm_report_ops *ops, void *priv); 112 119 int tsm_report_unregister(const struct tsm_report_ops *ops); 120 + struct tsm_dev *tsm_register(struct device *parent); 121 + void tsm_unregister(struct tsm_dev *tsm_dev); 113 122 #endif /* __TSM_H */