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 class device are parented by a device representing the platform security capability like CONFIG_CRYPTO_DEV_CCP or CONFIG_INTEL_TDX_HOST. This class 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: Xiaoyao Li <xiaoyao.li@xxxxxxxxx> Cc: Isaku Yamahata <isaku.yamahata@xxxxxxxxx> Cc: Alexey Kardashevskiy <aik@xxxxxxx> Cc: Yilun Xu <yilun.xu@xxxxxxxxx> Cc: Tom Lendacky <thomas.lendacky@xxxxxxx> Cc: John Allen <john.allen@xxxxxxx> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> --- Documentation/ABI/testing/sysfs-class-tsm | 10 +++ MAINTAINERS | 3 + drivers/virt/coco/Kconfig | 2 + drivers/virt/coco/Makefile | 1 drivers/virt/coco/host/Kconfig | 6 ++ drivers/virt/coco/host/Makefile | 6 ++ drivers/virt/coco/host/tsm-core.c | 113 +++++++++++++++++++++++++++++ include/linux/tsm.h | 5 + 8 files changed, 145 insertions(+), 1 deletion(-) create mode 100644 Documentation/ABI/testing/sysfs-class-tsm create mode 100644 drivers/virt/coco/host/Kconfig create mode 100644 drivers/virt/coco/host/Makefile create mode 100644 drivers/virt/coco/host/tsm-core.c diff --git a/Documentation/ABI/testing/sysfs-class-tsm b/Documentation/ABI/testing/sysfs-class-tsm new file mode 100644 index 000000000000..7503f04a9eb9 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-tsm @@ -0,0 +1,10 @@ +What: /sys/class/tsm/tsm0 +Date: Dec, 2024 +Contact: linux-coco@xxxxxxxxxxxxxxx +Description: + "tsm0" is a singleton device that represents the generic + attributes of a platform TEE Security Manager. It is a child of + the platform TSM device. /sys/class/tsm/tsm0/uevent + signals when the PCI layer is able to support establishment of + link encryption and other device-security features coordinated + through the platform tsm. diff --git a/MAINTAINERS b/MAINTAINERS index 0c8f61662836..abaabbc39134 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -23838,12 +23838,13 @@ W: https://github.com/srcres258/linux-doc T: git git://github.com/srcres258/linux-doc.git doc-zh-tw F: Documentation/translations/zh_TW/ -TRUSTED SECURITY MODULE (TSM) ATTESTATION REPORTS +TRUSTED (TEE) SECURITY MANAGER (TSM) M: Dan Williams <dan.j.williams@xxxxxxxxx> L: linux-coco@xxxxxxxxxxxxxxx S: Maintained F: Documentation/ABI/testing/configfs-tsm-report F: drivers/virt/coco/guest/ +F: drivers/virt/coco/host/ F: include/linux/tsm.h TRUSTED SERVICES TEE DRIVER diff --git a/drivers/virt/coco/Kconfig b/drivers/virt/coco/Kconfig index 819a97e8ba99..14e7cf145d85 100644 --- a/drivers/virt/coco/Kconfig +++ b/drivers/virt/coco/Kconfig @@ -14,3 +14,5 @@ source "drivers/virt/coco/tdx-guest/Kconfig" source "drivers/virt/coco/arm-cca-guest/Kconfig" source "drivers/virt/coco/guest/Kconfig" + +source "drivers/virt/coco/host/Kconfig" diff --git a/drivers/virt/coco/Makefile b/drivers/virt/coco/Makefile index 885c9ef4e9fc..73f1b7bc5b11 100644 --- a/drivers/virt/coco/Makefile +++ b/drivers/virt/coco/Makefile @@ -8,3 +8,4 @@ obj-$(CONFIG_SEV_GUEST) += sev-guest/ obj-$(CONFIG_INTEL_TDX_GUEST) += tdx-guest/ obj-$(CONFIG_ARM_CCA_GUEST) += arm-cca-guest/ obj-$(CONFIG_TSM_REPORTS) += guest/ +obj-y += host/ diff --git a/drivers/virt/coco/host/Kconfig b/drivers/virt/coco/host/Kconfig new file mode 100644 index 000000000000..4fbc6ef34f12 --- /dev/null +++ b/drivers/virt/coco/host/Kconfig @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# TSM (TEE Security Manager) Common infrastructure and host drivers +# +config TSM + tristate diff --git a/drivers/virt/coco/host/Makefile b/drivers/virt/coco/host/Makefile new file mode 100644 index 000000000000..be0aba6007cd --- /dev/null +++ b/drivers/virt/coco/host/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# TSM (TEE Security Manager) Common infrastructure and host drivers + +obj-$(CONFIG_TSM) += tsm.o +tsm-y := tsm-core.o diff --git a/drivers/virt/coco/host/tsm-core.c b/drivers/virt/coco/host/tsm-core.c new file mode 100644 index 000000000000..0ee738fc40ed --- /dev/null +++ b/drivers/virt/coco/host/tsm-core.c @@ -0,0 +1,113 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright(c) 2024 Intel Corporation. All rights reserved. */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/tsm.h> +#include <linux/rwsem.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/cleanup.h> + +static DECLARE_RWSEM(tsm_core_rwsem); +static struct class *tsm_class; +static struct tsm_subsys { + struct device dev; +} *tsm_subsys; + +static struct tsm_subsys * +alloc_tsm_subsys(struct device *parent, const struct attribute_group **groups) +{ + struct tsm_subsys *subsys = kzalloc(sizeof(*subsys), GFP_KERNEL); + struct device *dev; + + if (!subsys) + return ERR_PTR(-ENOMEM); + dev = &subsys->dev; + dev->parent = parent; + dev->groups = groups; + dev->class = tsm_class; + device_initialize(dev); + return subsys; +} + +static void put_tsm_subsys(struct tsm_subsys *subsys) +{ + if (!IS_ERR_OR_NULL(subsys)) + put_device(&subsys->dev); +} + +DEFINE_FREE(put_tsm_subsys, struct tsm_subsys *, + if (!IS_ERR_OR_NULL(_T)) put_tsm_subsys(_T)) +struct tsm_subsys *tsm_register(struct device *parent, + const struct attribute_group **groups) +{ + struct device *dev; + int rc; + + guard(rwsem_write)(&tsm_core_rwsem); + if (tsm_subsys) { + dev_warn(parent, "failed to register: %s already registered\n", + dev_name(tsm_subsys->dev.parent)); + return ERR_PTR(-EBUSY); + } + + struct tsm_subsys *subsys __free(put_tsm_subsys) = + alloc_tsm_subsys(parent, groups); + if (IS_ERR(subsys)) + return subsys; + + dev = &subsys->dev; + rc = dev_set_name(dev, "tsm0"); + if (rc) + return ERR_PTR(rc); + + rc = device_add(dev); + if (rc) + return ERR_PTR(rc); + + tsm_subsys = no_free_ptr(subsys); + + return tsm_subsys; +} +EXPORT_SYMBOL_GPL(tsm_register); + +void tsm_unregister(struct tsm_subsys *subsys) +{ + guard(rwsem_write)(&tsm_core_rwsem); + if (!tsm_subsys || subsys != tsm_subsys) { + pr_warn("failed to unregister, not currently registered\n"); + return; + } + + device_unregister(&subsys->dev); + tsm_subsys = NULL; +} +EXPORT_SYMBOL_GPL(tsm_unregister); + +static void tsm_release(struct device *dev) +{ + struct tsm_subsys *subsys = container_of(dev, typeof(*subsys), dev); + + kfree(subsys); +} + +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 core"); diff --git a/include/linux/tsm.h b/include/linux/tsm.h index 431054810dca..1a97459fc23e 100644 --- a/include/linux/tsm.h +++ b/include/linux/tsm.h @@ -5,6 +5,7 @@ #include <linux/sizes.h> #include <linux/types.h> #include <linux/uuid.h> +#include <linux/device.h> #define TSM_REPORT_INBLOB_MAX 64 #define TSM_REPORT_OUTBLOB_MAX SZ_32K @@ -109,4 +110,8 @@ 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_subsys; +struct tsm_subsys *tsm_register(struct device *parent, + const struct attribute_group **groups); +void tsm_unregister(struct tsm_subsys *subsys); #endif /* __TSM_H */
