From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (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 EBA2720CCE7 for ; Wed, 11 Dec 2024 03:22:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733887348; cv=none; b=s8gb5Sqb0KArMd+ID6DkW/ri6TOpMeuC+u0lCG63VU1mVzmQwFPhH6i3qUVMrH/GZU9WU5VNXcCXDHNk9LyBKXGstfZO+vmTuAVE6E4R1fajO++PxRTULl9piusZfXfcrq5dc66BxDmXgFk3+qg4EVLCzzvAsrg+WdESmRPfhHA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733887348; c=relaxed/simple; bh=hz9Kf6s/8cVyYMXFwuPeNEQToFN/ROluWpsJw+gUazg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=kBLO0BnQUKEOSVue8TzzwM929TDW8Qbuan/OpDe2oRKXEZZZZY3vuRvAYrMciXl2RXvFAskh7ilXoRgLQZFK3dIUzwkIOcPKoqEZV8BQoakxFQBMX5Sk9vt3KCheoL5l6Yovn4LKGttxQ2jt6VrBdnbBoZs50h6U2UA1CA8Rv7k= 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=iM68Vd+d; arc=none smtp.client-ip=192.198.163.8 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="iM68Vd+d" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1733887346; x=1765423346; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=hz9Kf6s/8cVyYMXFwuPeNEQToFN/ROluWpsJw+gUazg=; b=iM68Vd+d8EOxlcFLWHvrUxtaYFchzyJnVHtQZsgTtCrPK0cPIBBCusyZ OpSsR2lE4eIaBUwECGLPFCRPAibN/UjZ8qVuJXPUTCEh5rEZPwD2mQT2f ew4+oS8jendxP+He42LUEMSM9wxg8QlmaQrvuCft96vr3fMDTDLdKZd7r /GAQXilssyiys0fDH02pyjOPo+NExVv6C5mcUMBuYtGMj/aCwroImp0NW xB6ax1bELGMLfZ9fPr/8ZvAqHHlXSUnestkkOzA7MeqFZYNVr1h/bh2p5 ETDFsNO8o8FaL34k+gEeaClSGNyZ76zJAIa5tu2LYVnqZEZFBwWSwhOxR A==; X-CSE-ConnectionGUID: 3GdXYmCaTsumpL7Q+ep56g== X-CSE-MsgGUID: K/hec7kyRay75kFzkULfSg== X-IronPort-AV: E=McAfee;i="6700,10204,11282"; a="51785411" X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="51785411" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Dec 2024 19:22:24 -0800 X-CSE-ConnectionGUID: vyHKn68QRly3/voiU+MkLw== X-CSE-MsgGUID: F966QfMXRIG9269Izoqr0Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="118878399" Received: from ibarbour-mobl.amr.corp.intel.com (HELO bxing-mobl1.clients.intel.com) ([10.246.116.49]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Dec 2024 19:22:23 -0800 From: Cedric Xing Date: Tue, 10 Dec 2024 21:22:15 -0600 Subject: [PATCH RFC v3 1/2] tsm: Add TVM Measurement Register Support Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20241210-tsm-rtmr-v3-1-5997d4dbda73@intel.com> References: <20241210-tsm-rtmr-v3-0-5997d4dbda73@intel.com> In-Reply-To: <20241210-tsm-rtmr-v3-0-5997d4dbda73@intel.com> To: Dan Williams , Samuel Ortiz , James Bottomley , Lukas Wunner , Dionna Amalie Glaze , Qinkun Bao , Mikko Ylinen , Kuppuswamy Sathyanarayanan Cc: linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev X-Mailer: b4 0.13.0 This commit extends the TSM core with support for CC measurement registers (MRs). The newly added APIs are: - `tsm_register_measurement(struct tsm_measurement *)`: This API allows a CC guest driver to register a set of measurement registers with the TSM core. - `tsm_unregister_measurement(struct tsm_measurement *)`: This API enables a CC guest driver to unregister a previously registered set of measurement registers. `struct tsm_measurement` has been defined to encapsulate the details of CC-specific MRs. It includes an array of `struct tsm_measurement_register`s and provides operations for reading and updating these registers. For a comprehensive understanding of the structure and its usage, refer to the detailed comments in `include/linux/tsm.h`. Upon successful registration of a measurement provider, the TSM core exposes the MRs through a directory tree in the sysfs filesystem. The root of this tree is located at `/sys/kernel/tsm/MR_PROVIDER/`, where `MR_PROVIDER` is the name of the measurement provider (as specified by `struct tsm_measurement::name`). Each MR is made accessible as either a file or a directory of the specified name (i.e., `tsm_measurement_register::mr_name`). In the former case, the file content is the MR value; while in the latter case `HASH_ALG/digest` under the MR directory contains the MR value, where `HASH_ALG` specifies the hash algorithm (e.g., sha256, sha384, etc.) used by this MR. *Crypto Agility* is supported as a set of independent MRs that share a common name. These MRs will be merged into a single MR directory and each will be represented by its respective `HASH_ALG/digest` file. Note that `tsm_measurement_register::mr_hash` must be distinct or the behavior is undefined. Signed-off-by: Cedric Xing --- MAINTAINERS | 2 +- drivers/virt/coco/Kconfig | 3 +- drivers/virt/coco/Makefile | 2 + drivers/virt/coco/{tsm.c => tsm-core.c} | 6 +- drivers/virt/coco/tsm-mr.c | 376 ++++++++++++++++++++++++++++++++ include/linux/tsm.h | 64 ++++++ 6 files changed, 450 insertions(+), 3 deletions(-) diff --git a/MAINTAINERS b/MAINTAINERS index 17daa9ee9384..4c833fa9e388 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -23846,7 +23846,7 @@ M: Dan Williams L: linux-coco@lists.linux.dev S: Maintained F: Documentation/ABI/testing/configfs-tsm -F: drivers/virt/coco/tsm.c +F: drivers/virt/coco/tsm*.c F: include/linux/tsm.h TRUSTED SERVICES TEE DRIVER diff --git a/drivers/virt/coco/Kconfig b/drivers/virt/coco/Kconfig index ff869d883d95..6f3c0831680b 100644 --- a/drivers/virt/coco/Kconfig +++ b/drivers/virt/coco/Kconfig @@ -5,7 +5,8 @@ config TSM_REPORTS select CONFIGFS_FS - tristate + select CRYPTO_HASH_INFO + tristate "Trusted Security Module (TSM) sysfs/configfs support" source "drivers/virt/coco/efi_secret/Kconfig" diff --git a/drivers/virt/coco/Makefile b/drivers/virt/coco/Makefile index c3d07cfc087e..4b108d8df1bd 100644 --- a/drivers/virt/coco/Makefile +++ b/drivers/virt/coco/Makefile @@ -2,6 +2,8 @@ # # Confidential computing related collateral # +tsm-y += tsm-core.o tsm-mr.o + obj-$(CONFIG_TSM_REPORTS) += tsm.o obj-$(CONFIG_EFI_SECRET) += efi_secret/ obj-$(CONFIG_ARM_PKVM_GUEST) += pkvm-guest/ diff --git a/drivers/virt/coco/tsm.c b/drivers/virt/coco/tsm-core.c similarity index 99% rename from drivers/virt/coco/tsm.c rename to drivers/virt/coco/tsm-core.c index 9432d4e303f1..ab5269db9c13 100644 --- a/drivers/virt/coco/tsm.c +++ b/drivers/virt/coco/tsm-core.c @@ -476,6 +476,9 @@ int tsm_unregister(const struct tsm_ops *ops) } EXPORT_SYMBOL_GPL(tsm_unregister); +int tsm_mr_init(void); +void tsm_mr_exit(void); + static struct config_group *tsm_report_group; static int __init tsm_init(void) @@ -497,12 +500,13 @@ static int __init tsm_init(void) } tsm_report_group = tsm; - return 0; + return tsm_mr_init(); } module_init(tsm_init); static void __exit tsm_exit(void) { + tsm_mr_exit(); configfs_unregister_default_group(tsm_report_group); configfs_unregister_subsystem(&tsm_configfs); } diff --git a/drivers/virt/coco/tsm-mr.c b/drivers/virt/coco/tsm-mr.c new file mode 100644 index 000000000000..499d2aa1e6c7 --- /dev/null +++ b/drivers/virt/coco/tsm-mr.c @@ -0,0 +1,376 @@ +// 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 + +int tsm_mr_init(void); +void tsm_mr_exit(void); + +enum tmr_dir_battr_index { + TMR_DIR_BA_DIGEST, + TMR_DIR_BA__COUNT, + + TMR_DIR__ALGO_MAX = 4, +}; + +struct tmr_dir { + struct kobject kobj; + struct bin_attribute battrs[TMR_DIR__ALGO_MAX][TMR_DIR_BA__COUNT]; + int algo; +}; + +struct tmr_provider { + struct kset kset; + struct rw_semaphore rwsem; + struct bin_attribute *mrfiles; + struct tsm_measurement *tmr; + bool in_sync; +}; + +static inline struct tmr_provider *tmr_mr_to_provider(const struct tsm_measurement_register *mr, + struct kobject *kobj) +{ + if (mr->mr_flags & TSM_MR_F_F) + return container_of(kobj, struct tmr_provider, kset.kobj); + else + return container_of(kobj->kset, struct tmr_provider, kset); +} + +static inline int tmr_call_refresh(struct tmr_provider *pvd, + const struct tsm_measurement_register *mr) +{ + int rc; + + rc = pvd->tmr->refresh(pvd->tmr, mr); + if (rc) + pr_warn("%s.extend(%s) failed %d\n", kobject_name(&pvd->kset.kobj), mr->mr_name, + rc); + return rc; +} + +static inline int tmr_call_extend(struct tmr_provider *pvd, + const struct tsm_measurement_register *mr, const u8 *data) +{ + int rc; + + rc = pvd->tmr->extend(pvd->tmr, mr, data); + if (rc) + pr_warn("%s.extend(%s) failed %d\n", kobject_name(&pvd->kset.kobj), mr->mr_name, + rc); + return rc; +} + +static ssize_t tmr_digest_read(struct file *filp, struct kobject *kobj, struct bin_attribute *attr, + char *page, loff_t off, size_t count) +{ + const struct tsm_measurement_register *mr; + struct tmr_provider *pvd; + int rc; + + if (off < 0 || off > attr->size) + return -EINVAL; + + count = min(count, attr->size - (size_t)off); + if (!count) + return count; + + mr = (typeof(mr))attr->private; + pvd = tmr_mr_to_provider(mr, kobj); + rc = down_read_interruptible(&pvd->rwsem); + if (rc) + return rc; + + if ((mr->mr_flags & TSM_MR_F_L) && !pvd->in_sync) { + up_read(&pvd->rwsem); + + rc = down_write_killable(&pvd->rwsem); + if (rc) + return rc; + + if (!pvd->in_sync) { + rc = tmr_call_refresh(pvd, mr); + pvd->in_sync = !rc; + } + + downgrade_write(&pvd->rwsem); + } + + if (!rc) + memcpy(page, mr->mr_value + off, count); + else + pr_debug("%s.refresh(%s)=%d\n", kobject_name(&pvd->kset.kobj), mr->mr_name, rc); + + up_read(&pvd->rwsem); + return rc ?: count; +} + +static ssize_t tmr_digest_write(struct file *filp, struct kobject *kobj, struct bin_attribute *attr, + char *page, loff_t off, size_t count) +{ + const struct tsm_measurement_register *mr; + struct tmr_provider *pvd; + ssize_t rc; + + if (off != 0 || count != attr->size) + return -EINVAL; + + mr = (typeof(mr))attr->private; + pvd = tmr_mr_to_provider(mr, kobj); + rc = down_write_killable(&pvd->rwsem); + if (rc) + return rc; + + if (mr->mr_flags & TSM_MR_F_X) + rc = tmr_call_extend(pvd, mr, page); + else + memcpy(mr->mr_value, page, count); + + if (!rc) + pvd->in_sync = false; + + up_write(&pvd->rwsem); + return rc ?: count; +} + +static void tmr_dir_release(struct kobject *kobj) +{ + struct tmr_dir *mrd; + + mrd = container_of(kobj, typeof(*mrd), kobj); + pr_debug("%s(%s)\n", __func__, kobject_name(kobj)); + kfree(mrd); +} + +static const struct kobj_type tmr_dir_ktype = { + .release = tmr_dir_release, + .sysfs_ops = &kobj_sysfs_ops, +}; + +static struct tmr_dir *tmr_dir_create(const struct tsm_measurement_register *mr, + struct tmr_provider *pvd) +{ + struct kobject *kobj; + struct tmr_dir *mrd; + + kobj = kset_find_obj(&pvd->kset, mr->mr_name); + if (kobj) { + mrd = container_of(kobj, typeof(*mrd), kobj); + kobject_put(kobj); + if (++mrd->algo >= TMR_DIR__ALGO_MAX) { + --mrd->algo; + return ERR_PTR(-ENOSPC); + } + } else { + int rc; + + mrd = kzalloc(sizeof(*mrd), GFP_KERNEL); + if (!mrd) + return ERR_PTR(-ENOMEM); + + mrd->kobj.kset = &pvd->kset; + rc = kobject_init_and_add(&mrd->kobj, &tmr_dir_ktype, NULL, "%s", mr->mr_name); + if (rc) { + kfree(mrd); + return ERR_PTR(rc); + } + } + + sysfs_bin_attr_init(&mrd->battrs[mrd->algo][TMR_DIR_BA_DIGEST]); + mrd->battrs[mrd->algo][TMR_DIR_BA_DIGEST].attr.name = "digest"; + if (mr->mr_flags & TSM_MR_F_W) + mrd->battrs[mrd->algo][TMR_DIR_BA_DIGEST].attr.mode |= S_IWUSR | S_IWGRP; + if (mr->mr_flags & TSM_MR_F_R) + mrd->battrs[mrd->algo][TMR_DIR_BA_DIGEST].attr.mode |= S_IRUGO; + + mrd->battrs[mrd->algo][TMR_DIR_BA_DIGEST].size = mr->mr_size; + mrd->battrs[mrd->algo][TMR_DIR_BA_DIGEST].read = tmr_digest_read; + mrd->battrs[mrd->algo][TMR_DIR_BA_DIGEST].write = tmr_digest_write; + mrd->battrs[mrd->algo][TMR_DIR_BA_DIGEST].private = (void *)mr; + + return mrd; +} + +static void tmr_provider_release(struct kobject *kobj) +{ + struct tmr_provider *pvd; + + pvd = container_of(kobj, typeof(*pvd), kset.kobj); + pr_debug("%s(%s)\n", __func__, kobject_name(kobj)); + if (!WARN_ON(!list_empty(&pvd->kset.list))) { + kfree(pvd->mrfiles); + kfree(pvd); + } +} + +static const struct kobj_type _mr_provider_ktype = { + .release = tmr_provider_release, + .sysfs_ops = &kobj_sysfs_ops, +}; + +static struct kset *tmr_sysfs_root; + +static struct tmr_provider *tmr_provider_create(struct tsm_measurement *tmr) +{ + struct tmr_provider *pvd __free(kfree); + int rc; + + pvd = kzalloc(sizeof(*pvd), GFP_KERNEL); + if (!pvd) + return ERR_PTR(-ENOMEM); + + if (!tmr->name || !tmr->mrs || !tmr->refresh || !tmr->extend) + return ERR_PTR(-EINVAL); + + rc = kobject_set_name(&pvd->kset.kobj, "%s", tmr->name); + if (rc) + return ERR_PTR(rc); + + pvd->kset.kobj.kset = tmr_sysfs_root; + pvd->kset.kobj.ktype = &_mr_provider_ktype; + pvd->tmr = tmr; + + init_rwsem(&pvd->rwsem); + + rc = kset_register(&pvd->kset); + if (rc) + return ERR_PTR(rc); + + return_ptr(pvd); +} + +DEFINE_FREE(_unregister_measurement, struct tmr_provider *, + if (!IS_ERR_OR_NULL(_T)) tsm_unregister_measurement(_T->tmr)); + +int tsm_register_measurement(struct tsm_measurement *tmr) +{ + struct tmr_provider *pvd __free(_unregister_measurement); + int rc, nr; + + pvd = tmr_provider_create(tmr); + if (IS_ERR(pvd)) + return PTR_ERR(pvd); + + nr = 0; + for (int i = 0; tmr->mrs[i].mr_name; ++i) { + // flat files are counted and skipped + if (tmr->mrs[i].mr_flags & TSM_MR_F_F) { + ++nr; + continue; + } + + struct tmr_dir *mrd; + struct bin_attribute *battrs[TMR_DIR_BA__COUNT + 1] = {}; + struct attribute_group agrp = { + .name = hash_algo_name[tmr->mrs[i].mr_hash], + .bin_attrs = battrs, + }; + + mrd = tmr_dir_create(&tmr->mrs[i], pvd); + if (IS_ERR(mrd)) + return PTR_ERR(mrd); + + for (int j = 0; j < TMR_DIR_BA__COUNT; ++j) + battrs[j] = &mrd->battrs[mrd->algo][j]; + + rc = sysfs_create_group(&mrd->kobj, &agrp); + if (rc) + return rc; + } + + if (nr > 0) { + struct bin_attribute *mrfiles __free(kfree); + struct bin_attribute **battrs __free(kfree); + + mrfiles = kcalloc(nr, sizeof(*mrfiles), GFP_KERNEL); + battrs = kcalloc(nr + 1, sizeof(*battrs), GFP_KERNEL); + if (!battrs || !mrfiles) + return -ENOMEM; + + for (int i = 0, j = 0; tmr->mrs[i].mr_name; ++i) { + if (!(tmr->mrs[i].mr_flags & TSM_MR_F_F)) + continue; + + mrfiles[j].attr.name = tmr->mrs[i].mr_name; + mrfiles[j].read = tmr_digest_read; + mrfiles[j].write = tmr_digest_write; + mrfiles[j].size = tmr->mrs[i].mr_size; + mrfiles[j].private = (void *)&tmr->mrs[i]; + if (tmr->mrs[i].mr_flags & TSM_MR_F_R) + mrfiles[j].attr.mode |= S_IRUGO; + if (tmr->mrs[i].mr_flags & TSM_MR_F_W) + mrfiles[j].attr.mode |= S_IWUSR | S_IWGRP; + + battrs[j] = &mrfiles[j]; + ++j; + } + + struct attribute_group agrp = { + .bin_attrs = battrs, + }; + rc = sysfs_create_group(&pvd->kset.kobj, &agrp); + if (rc) + return rc; + + pvd->mrfiles = no_free_ptr(mrfiles); + } + + // set pvd to NULL or it will be freed due to __free(kfree) + pvd = NULL; + return 0; +} +EXPORT_SYMBOL_GPL(tsm_register_measurement); + +static void tmr_put_children(struct kset *kset) +{ + struct kobject *p, *n; + + spin_lock(&kset->list_lock); + list_for_each_entry_safe(p, n, &kset->list, entry) { + spin_unlock(&kset->list_lock); + kobject_put(p); + spin_lock(&kset->list_lock); + } + spin_unlock(&kset->list_lock); +} + +int tsm_unregister_measurement(struct tsm_measurement *tmr) +{ + struct kobject *kobj; + struct tmr_provider *pvd; + + kobj = kset_find_obj(tmr_sysfs_root, tmr->name); + if (!kobj) + return -ENOENT; + + pvd = container_of(kobj, typeof(*pvd), kset.kobj); + if (pvd->tmr != tmr) + return -EINVAL; + + tmr_put_children(&pvd->kset); + kset_unregister(&pvd->kset); + kobject_put(kobj); + return 0; +} +EXPORT_SYMBOL_GPL(tsm_unregister_measurement); + +int tsm_mr_init(void) +{ + tmr_sysfs_root = kset_create_and_add("tsm", NULL, kernel_kobj); + if (!tmr_sysfs_root) + return -ENOMEM; + return 0; +} + +void tsm_mr_exit(void) +{ + kset_unregister(tmr_sysfs_root); +} + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Provide Trusted Security Module measurements via sysfs"); diff --git a/include/linux/tsm.h b/include/linux/tsm.h index 11b0c525be30..624a7b62b85d 100644 --- a/include/linux/tsm.h +++ b/include/linux/tsm.h @@ -5,6 +5,7 @@ #include #include #include +#include #define TSM_INBLOB_MAX 64 #define TSM_OUTBLOB_MAX SZ_32K @@ -109,4 +110,67 @@ struct tsm_ops { int tsm_register(const struct tsm_ops *ops, void *priv); int tsm_unregister(const struct tsm_ops *ops); + +/** + * struct tsm_measurement_register - describes an architectural measurement register (MR) + * @mr_name: name of the MR + * @mr_value: buffer containing the current value of the MR + * @mr_size: size of the MR - typically the digest size of @mr_hash + * @mr_flags: bitwise OR of flags defined in enum tsm_measurement_register_flag + * @mr_hash: optional hash identifier defined in include/uapi/linux/hash_info.h + * + * A CC guest driver provides this structure to detail the measurement facility supported by the + * underlying CC hardware. After registration via `tsm_register_measurement`, the CC guest driver + * must retain this structure until it is unregistered using `tsm_unregister_measurement`. + */ +struct tsm_measurement_register { + const char *mr_name; + void *mr_value; + u32 mr_size; + u32 mr_flags; + enum hash_algo mr_hash; +}; + +/** + * enum tsm_measurement_register_flag - properties of an MR + * @TSM_MR_F_X: this MR supports the extension semantics on write + * @TSM_MR_F_W: this MR is writable + * @TSM_MR_F_R: this MR is readable. This should typically be set + * @TSM_MR_F_L: this MR is live - writes to other MRs may change this MR + * @TSM_MR_F_F: present this MR as a file (instead of a directory) + * @TSM_MR_F_LIVE: shorthand for L (live) and R (readable) + * @TSM_MR_F_RTMR: shorthand for LIVE and X (extensible) + */ +enum tsm_measurement_register_flag { + TSM_MR_F_X = 1, + TSM_MR_F_W = 2, + TSM_MR_F_R = 4, + TSM_MR_F_L = 8, + TSM_MR_F_F = 16, + TSM_MR_F_LIVE = TSM_MR_F_L | TSM_MR_F_R, + TSM_MR_F_RTMR = TSM_MR_F_LIVE | TSM_MR_F_X, +}; + +#define TSM_MR_(mr, hash) \ + .mr_name = #mr, .mr_size = hash##_DIGEST_SIZE, .mr_hash = HASH_ALGO_##hash, \ + .mr_flags = TSM_MR_F_R + +/** + * struct tsm_measurement - define CC specific MRs and methods for updating them + * @name: name of the measurement provider + * @mrs: array of MR definitions ending with mr_name set to %NULL + * @refresh: invoked to update the specified MR + * @extend: invoked to extend the specified MR with mr_size bytes + */ +struct tsm_measurement { + const char *name; + const struct tsm_measurement_register *mrs; + int (*refresh)(struct tsm_measurement *tmr, const struct tsm_measurement_register *mr); + int (*extend)(struct tsm_measurement *tmr, const struct tsm_measurement_register *mr, + const u8 *data); +}; + +int tsm_register_measurement(struct tsm_measurement *tmr); +int tsm_unregister_measurement(struct tsm_measurement *tmr); + #endif /* __TSM_H */ -- 2.43.0