From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) (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 0120D28EC for ; Sun, 8 Sep 2024 04:57:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.9 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725771473; cv=none; b=qyp4+ChjdDX7ZWYFjc84wVqzgjH1jUIxG7j/tiw1Ia7LUIHmzS11wnWptUGDr/tu99wgj2KDLftiklocwignzlJU999jY+JiVb7nhjC3AvS3IRFWBEYComAuSzlwfoQSW/sdayfi/PusCXqJYPa5bQA+EIJ1byGqDK/h0EPp3e0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725771473; c=relaxed/simple; bh=xD/sz73bewgKRorRh4MBtS0BXrpfPei7LS5GZqG3Qnc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=QXok5e5J4gOQG9CERuE4dTgYyCpmBifsXyeZxFNAIiA+3Xt6ugyNwFbNue7ER5paWpNHATexDsHJEzuEyaoZCPc14F1YQA+jIlNdd04ziJH2DQKKSZC1d15pyOo1RqjJ/8O2Y7UGF0Q5OPmpQOhsWSsQIzOqsXBwIme2UBA32TA= 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=VHITgpZm; arc=none smtp.client-ip=192.198.163.9 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="VHITgpZm" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1725771471; x=1757307471; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=xD/sz73bewgKRorRh4MBtS0BXrpfPei7LS5GZqG3Qnc=; b=VHITgpZmNZ8cZWCKnZ9wl9WjxT3SQqooV/dzCLK21M0CfPZGULj0r228 vExgRz0rZwgiu9ScPmXFM0BtFiNAy8z+CZVEu3iSQOlGhGc3fnAMRhBHe Gdmkw6PmvE5vX6XrQjfTUTmtnTy68CZ74ghquQu20y1Q/N5q4HNEU3PvD vSjnkBjXTvY5A8kMckWKxovH4t2UyA0jM41WH+CFrRuodlFOc9prkfsoe JPEN7+0iJnnSAJPWuBruLdyUNqJQ5X4KtGe17Pjw7C3Y4UDNy7isZOAW+ KKSuVvFMTRdWE1vTCUABP/6kgtb+B7gDe3p9gdkuUL0b6Vlw5+Kh4hylD A==; X-CSE-ConnectionGUID: WyTOlIM4R4SJFB2CSLNHLw== X-CSE-MsgGUID: lCa2hVtQS26JiBgq+Lpo4w== X-IronPort-AV: E=McAfee;i="6700,10204,11188"; a="35152167" X-IronPort-AV: E=Sophos;i="6.10,211,1719903600"; d="scan'208";a="35152167" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Sep 2024 21:57:49 -0700 X-CSE-ConnectionGUID: j/a+WePbQnm4kUd7hfMlsg== X-CSE-MsgGUID: k7Y5I/V7Slmbl7UuTRPgNQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,211,1719903600"; d="scan'208";a="70924657" Received: from ibarbour-mobl.amr.corp.intel.com (HELO bxing-mobl1.clients.intel.com) ([10.246.116.49]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Sep 2024 21:57:49 -0700 From: Cedric Xing Date: Sat, 07 Sep 2024 23:56:19 -0500 Subject: [PATCH RFC 1/3] 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: <20240907-tsm-rtmr-v1-1-12fc4d43d4e7@intel.com> References: <20240907-tsm-rtmr-v1-0-12fc4d43d4e7@intel.com> In-Reply-To: <20240907-tsm-rtmr-v1-0-12fc4d43d4e7@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_provider(struct tsm_measurement_provider *)` This function allows a CC guest driver to register a set of measurement registers with the TSM core. - `tsm_unregister_measurement_provider(struct tsm_measurement_provider *)`: This function enables a CC guest driver to unregister a previously registered set of measurement registers. The `struct tsm_measurement_provider` 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 added 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//`, with `` being the name of the measurement provider. Each static MR is made accessible as a read-only file, named after the MR itself. Runtime MRs (RTMRs) are represented as directories named after the RTMR, containing two files: `digest` and `hash_algo`. The purpose and content of these files are self-explanatory. Signed-off-by: Cedric Xing --- drivers/virt/coco/Kconfig | 4 +- drivers/virt/coco/tsm.c | 390 ++++++++++++++++++++++++++++++++++++++++++++-- include/linux/tsm.h | 62 ++++++++ 3 files changed, 446 insertions(+), 10 deletions(-) diff --git a/drivers/virt/coco/Kconfig b/drivers/virt/coco/Kconfig index 87d142c1f932..0ce23c8d5854 100644 --- a/drivers/virt/coco/Kconfig +++ b/drivers/virt/coco/Kconfig @@ -5,7 +5,9 @@ config TSM_REPORTS select CONFIGFS_FS - tristate + select SYSFS + 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/tsm.c b/drivers/virt/coco/tsm.c index 9432d4e303f1..e83143f22fad 100644 --- a/drivers/virt/coco/tsm.c +++ b/drivers/virt/coco/tsm.c @@ -1,8 +1,6 @@ // SPDX-License-Identifier: GPL-2.0-only /* Copyright(c) 2023 Intel Corporation. All rights reserved. */ -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - #include #include #include @@ -11,6 +9,8 @@ #include #include #include +#include +#include static struct tsm_provider { const struct tsm_ops *ops; @@ -166,8 +166,9 @@ static ssize_t tsm_report_service_guid_store(struct config_item *cfg, } CONFIGFS_ATTR_WO(tsm_report_, service_guid); -static ssize_t tsm_report_service_manifest_version_store(struct config_item *cfg, - const char *buf, size_t len) +static ssize_t +tsm_report_service_manifest_version_store(struct config_item *cfg, + const char *buf, size_t len) { struct tsm_report *report = to_tsm_report(cfg); unsigned int val; @@ -187,8 +188,8 @@ static ssize_t tsm_report_service_manifest_version_store(struct config_item *cfg } CONFIGFS_ATTR_WO(tsm_report_, service_manifest_version); -static ssize_t tsm_report_inblob_write(struct config_item *cfg, - const void *buf, size_t count) +static ssize_t tsm_report_inblob_write(struct config_item *cfg, const void *buf, + size_t count) { struct tsm_report *report = to_tsm_report(cfg); int rc; @@ -341,7 +342,8 @@ static struct configfs_attribute *tsm_report_attrs[] = { [TSM_REPORT_PRIVLEVEL_FLOOR] = &tsm_report_attr_privlevel_floor, [TSM_REPORT_SERVICE_PROVIDER] = &tsm_report_attr_service_provider, [TSM_REPORT_SERVICE_GUID] = &tsm_report_attr_service_guid, - [TSM_REPORT_SERVICE_MANIFEST_VER] = &tsm_report_attr_service_manifest_version, + [TSM_REPORT_SERVICE_MANIFEST_VER] = + &tsm_report_attr_service_manifest_version, NULL, }; @@ -383,7 +385,8 @@ static bool tsm_report_is_visible(struct config_item *item, } static bool tsm_report_is_bin_visible(struct config_item *item, - struct configfs_bin_attribute *attr, int n) + struct configfs_bin_attribute *attr, + int n) { guard(rwsem_read)(&tsm_rwsem); if (!provider.ops) @@ -476,7 +479,370 @@ int tsm_unregister(const struct tsm_ops *ops) } EXPORT_SYMBOL_GPL(tsm_unregister); +enum _rtmr_bin_attr_index { + _RTMR_BATTR_DIGEST, + _RTMR_BATTR__COUNT, +}; + +struct _rtmr { + struct kobject kobj; + struct bin_attribute battrs[_RTMR_BATTR__COUNT]; +}; + +struct _mr_provider { + struct kset kset; + struct rw_semaphore rwsem; + struct bin_attribute *static_mrs; + struct tsm_measurement_provider *provider; + bool in_sync; +}; + +static inline const struct tsm_measurement_register * +_rtmr_mr(const struct _rtmr *rtmr) +{ + return (struct tsm_measurement_register *)rtmr + ->battrs[_RTMR_BATTR_DIGEST] + .private; +} + +static inline struct _mr_provider * +_mr_to_group(const struct tsm_measurement_register *mr, struct kobject *kobj) +{ + if (!(mr->mr_flags & TSM_MR_F_X)) + return container_of(kobj, struct _mr_provider, kset.kobj); + else + return container_of(kobj->kset, struct _mr_provider, kset); +} + +static inline int _call_refresh(struct _mr_provider *pvd, + const struct tsm_measurement_register *mr) +{ + int rc = pvd->provider->refresh(pvd->provider, mr); + if (rc) + pr_warn(KBUILD_MODNAME ": %s.extend(%s) failed %d\n", + kobject_name(&pvd->kset.kobj), mr->mr_name, rc); + return rc; +} + +static inline int _call_extend(struct _mr_provider *pvd, + const struct tsm_measurement_register *mr, + const u8 *data) +{ + int rc = pvd->provider->extend(pvd->provider, mr, data); + if (rc) + pr_warn(KBUILD_MODNAME ": %s.extend(%s) failed %d\n", + kobject_name(&pvd->kset.kobj), mr->mr_name, rc); + return rc; +} + +static ssize_t hash_algo_show(struct kobject *kobj, struct kobj_attribute *attr, + char *page) +{ + struct _rtmr *rtmr; + rtmr = container_of(kobj, typeof(*rtmr), kobj); + return sysfs_emit(page, "%s", hash_algo_name[_rtmr_mr(rtmr)->mr_hash]); +} + +static ssize_t _mr_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 _mr_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; + BUG_ON(mr->mr_size != attr->size); + + pvd = _mr_to_group(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 = _call_refresh(pvd, mr); + pvd->in_sync = !rc; + } + + downgrade_write(&pvd->rwsem); + } + + if (!rc) + memcpy(page, mr->mr_value + off, count); + else + pr_debug(KBUILD_MODNAME ": refresh(%s,%s)=%d\n", + kobject_name(&pvd->kset.kobj), mr->mr_name, rc); + + up_read(&pvd->rwsem); + return rc ?: count; +} + +static inline size_t snprint_hex(char *sbuf, size_t size, const u8 *data, + size_t len) +{ + size_t ret = 0; + for (size_t i = 0; i < len; ++i) + ret += snprintf(sbuf + ret, size - ret, "%02x", data[i]); + return ret; +} + +static ssize_t _mr_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 _mr_provider *pvd; + ssize_t rc; + + if (off != 0 || count != attr->size) + return -EINVAL; + + mr = (typeof(mr))attr->private; + BUG_ON(mr->mr_size != attr->size); + + pvd = _mr_to_group(mr, kobj); + rc = down_write_killable(&pvd->rwsem); + if (rc) + return rc; + + if (mr->mr_flags & TSM_MR_F_X) + rc = pvd->provider->extend(pvd->provider, mr, (u8 *)page); + else { + BUG_ON(!(mr->mr_flags & TSM_MR_F_W)); + memcpy(mr->mr_value, page, count); + } + + if (!rc) + pvd->in_sync = false; + else + pr_warn(KBUILD_MODNAME ": extending %s/%s failed with %ld\n", + kobject_name(&pvd->kset.kobj), mr->mr_name, rc); + + up_write(&pvd->rwsem); + return rc ?: count; +} + +static void _rtmr_release(struct kobject *kobj) +{ + struct _rtmr *rtmr; + rtmr = container_of(kobj, typeof(*rtmr), kobj); + pr_debug("%s(%s)\n", __func__, kobject_name(kobj)); + kfree(rtmr); +} + +static struct kobj_type _rtmr_ktype = { + .release = _rtmr_release, + .sysfs_ops = &kobj_sysfs_ops, +}; + +static struct _rtmr *_rtmr_create(const struct tsm_measurement_register *mr, + struct _mr_provider *pvd) +{ + struct _rtmr *rtmr __free(kfree); + int rc; + + BUG_ON(!(mr->mr_flags & TSM_MR_F_X)); + rtmr = kzalloc(sizeof(*rtmr), GFP_KERNEL); + if (!rtmr) + return ERR_PTR(-ENOMEM); + + sysfs_bin_attr_init(&rtmr->battrs[_RTMR_BATTR_DIGEST]); + rtmr->battrs[_RTMR_BATTR_DIGEST].attr.name = "digest"; + if (mr->mr_flags & TSM_MR_F_W) + rtmr->battrs[_RTMR_BATTR_DIGEST].attr.mode |= S_IWUSR; + if (mr->mr_flags & TSM_MR_F_R) + rtmr->battrs[_RTMR_BATTR_DIGEST].attr.mode |= S_IRUGO; + + rtmr->battrs[_RTMR_BATTR_DIGEST].size = mr->mr_size; + rtmr->battrs[_RTMR_BATTR_DIGEST].read = _mr_read; + rtmr->battrs[_RTMR_BATTR_DIGEST].write = _mr_write; + rtmr->battrs[_RTMR_BATTR_DIGEST].private = (void *)mr; + + rtmr->kobj.kset = &pvd->kset; + rc = kobject_init_and_add(&rtmr->kobj, &_rtmr_ktype, NULL, "%s", + mr->mr_name); + if (rc) + return ERR_PTR(rc); + + return_ptr(rtmr); +} + +static void _mr_provider_release(struct kobject *kobj) +{ + struct _mr_provider *pvd; + pvd = container_of(kobj, typeof(*pvd), kset.kobj); + pr_debug("%s(%s)\n", __func__, kobject_name(kobj)); + BUG_ON(!list_empty(&pvd->kset.list)); + kfree(pvd->static_mrs); + kfree(pvd); +} + +static struct kobj_type _mr_provider_ktype = { + .release = _mr_provider_release, + .sysfs_ops = &kobj_sysfs_ops, +}; + static struct config_group *tsm_report_group; +static struct kset *_sysfs_tsm; + +static struct _mr_provider * +_mr_provider_create(struct tsm_measurement_provider *tpvd) +{ + struct _mr_provider *pvd __free(kfree); + int rc; + + pvd = kzalloc(sizeof(*pvd), GFP_KERNEL); + if (!pvd) + return ERR_PTR(-ENOMEM); + + if (!tpvd->name || !tpvd->mrs || !tpvd->refresh || !tpvd->extend) + return ERR_PTR(-EINVAL); + + rc = kobject_set_name(&pvd->kset.kobj, "%s", tpvd->name); + if (rc) + return ERR_PTR(rc); + + pvd->kset.kobj.kset = _sysfs_tsm; + pvd->kset.kobj.ktype = &_mr_provider_ktype; + pvd->provider = tpvd; + + rc = kset_register(&pvd->kset); + if (rc) + return ERR_PTR(rc); + + return_ptr(pvd); +} + +DEFINE_FREE(_unregister_measurement_provider, struct _mr_provider *, + if (!IS_ERR_OR_NULL(_T)) + tsm_unregister_measurement_provider(_T->provider)); + +int tsm_register_measurement_provider(struct tsm_measurement_provider *tpvd) +{ + static struct kobj_attribute _attr_hash = __ATTR_RO(hash_algo); + + struct _mr_provider *pvd __free(_unregister_measurement_provider); + int rc, nr; + + pvd = _mr_provider_create(tpvd); + if (IS_ERR(pvd)) + return PTR_ERR(pvd); + + nr = 0; + for (int i = 0; tpvd->mrs[i].mr_name; ++i) { + if (!(tpvd->mrs[i].mr_flags & TSM_MR_F_X)) { + ++nr; + continue; + } + + struct _rtmr *rtmr = _rtmr_create(&tpvd->mrs[i], pvd); + if (IS_ERR(rtmr)) + return PTR_ERR(rtmr); + + struct attribute *attrs[] = { + &_attr_hash.attr, + NULL, + }; + struct bin_attribute + *battrs[_RTMR_BATTR__COUNT + 1] = {}; + for (int j = 0; j < _RTMR_BATTR__COUNT; ++j) + battrs[j] = &rtmr->battrs[j]; + struct attribute_group agrp = { + .attrs = attrs, + .bin_attrs = battrs, + }; + rc = sysfs_create_group(&rtmr->kobj, &agrp); + if (rc) + return rc; + } + + if (nr > 0) { + struct bin_attribute *static_mrs __free(kfree); + struct bin_attribute **battrs __free(kfree); + + static_mrs = kcalloc(sizeof(*static_mrs), nr, GFP_KERNEL); + battrs = kcalloc(sizeof(*battrs), nr + 1, GFP_KERNEL); + if (!battrs || !static_mrs) + return -ENOMEM; + + for (int i = 0, j = 0; tpvd->mrs[i].mr_name; ++i) { + if (tpvd->mrs[i].mr_flags & TSM_MR_F_X) + continue; + + static_mrs[j].attr.name = tpvd->mrs[i].mr_name; + if (tpvd->mrs[i].mr_flags & TSM_MR_F_R) { + static_mrs[j].attr.mode |= S_IRUGO; + static_mrs[j].read = _mr_read; + } + if (tpvd->mrs[i].mr_flags & TSM_MR_F_W) { + static_mrs[j].attr.mode |= S_IWUSR; + static_mrs[j].write = _mr_write; + } + static_mrs[j].size = tpvd->mrs[i].mr_size; + static_mrs[j].private = (void *)&tpvd->mrs[i]; + + battrs[j] = &static_mrs[j]; + ++j; + + BUG_ON(j > nr); + } + + struct attribute_group agrp = { + .bin_attrs = battrs, + }; + rc = sysfs_create_group(&pvd->kset.kobj, &agrp); + if (rc) + return rc; + + pvd->static_mrs = no_free_ptr(static_mrs); + } + + pvd = NULL; + return 0; +} +EXPORT_SYMBOL_GPL(tsm_register_measurement_provider); + +static void _kset_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_provider(struct tsm_measurement_provider *tpvd) +{ + struct kobject *kobj = kset_find_obj(_sysfs_tsm, tpvd->name); + if (!kobj) + return -ENOENT; + + struct _mr_provider *pvd = container_of(kobj, typeof(*pvd), kset.kobj); + BUG_ON(pvd->provider != tpvd); + + _kset_put_children(&pvd->kset); + kset_unregister(&pvd->kset); + kobject_put(kobj); + return 0; +} +EXPORT_SYMBOL_GPL(tsm_unregister_measurement_provider); static int __init tsm_init(void) { @@ -497,16 +863,22 @@ static int __init tsm_init(void) } tsm_report_group = tsm; + _sysfs_tsm = kset_create_and_add("tsm", NULL, kernel_kobj); + if (!_sysfs_tsm) + return -ENOMEM; + return 0; } module_init(tsm_init); static void __exit tsm_exit(void) { + kset_unregister(_sysfs_tsm); configfs_unregister_default_group(tsm_report_group); configfs_unregister_subsystem(&tsm_configfs); } module_exit(tsm_exit); MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("Provide Trusted Security Module attestation reports via configfs"); +MODULE_DESCRIPTION( + "Provide Trusted Security Module attestation reports via configfs"); diff --git a/include/linux/tsm.h b/include/linux/tsm.h index 11b0c525be30..9fd7a2f0208e 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 +110,65 @@ 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 + */ +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 is extensible, should be set for RTMRs + * @TSM_MR_F_W: this MR is writable, should be set if direct extension to an + * RTMR is allowed + * @TSM_MR_F_R: this MR is readable. All MRs should have this flag set + * @TSM_MR_F_L: this MR is live - writes to other MRs may change this MR + * @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_LIVE = TSM_MR_F_L | TSM_MR_F_R, + TSM_MR_F_RTMR = TSM_MR_F_LIVE | TSM_MR_F_X, +}; + +#define TSM_MR_(h, f) .mr_size = h##_DIGEST_SIZE, .mr_flags = (f) +#define TSM_MR(h) TSM_MR_(h, TSM_MR_F_R) +#define TSM_RTMR(h) TSM_MR_(h, TSM_MR_F_RTMR), .mr_hash = HASH_ALGO_##h + +/** + * struct tsm_measurement_provider - 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_provider { + const char *name; + const struct tsm_measurement_register *mrs; + int (*refresh)(struct tsm_measurement_provider *, + const struct tsm_measurement_register *); + int (*extend)(struct tsm_measurement_provider *, + const struct tsm_measurement_register *, const u8 *); +}; + +int tsm_register_measurement_provider(struct tsm_measurement_provider *); +int tsm_unregister_measurement_provider(struct tsm_measurement_provider *); + #endif /* __TSM_H */ -- 2.43.0