From patchwork Tue Sep 28 03:13:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 12521633 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81E53C433EF for ; Tue, 28 Sep 2021 03:13:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 68D6361279 for ; Tue, 28 Sep 2021 03:13:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238822AbhI1DPf (ORCPT ); Mon, 27 Sep 2021 23:15:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:60864 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238748AbhI1DPf (ORCPT ); Mon, 27 Sep 2021 23:15:35 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 31F4A6127C; Tue, 28 Sep 2021 03:13:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1632798836; bh=8fB8mikxXPNO2h/2xBZsQSlNcFQzTYO/QiPBmJA6W1s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DOamniHm5AMHOqxNm9theY01F5aYAYqdmxT4Iw3+AIi4ZyB6TIgtem5CbiInPDLqF PqqGpCOKakbKFyTeQ0dClRJrNw56fV55pEX7RaavdBCXSF5ZSrZ/weNlJ5b/ikZhex XCiHvgGAzYBQZxkW7nVpzpjjGLr5JcofmnXoJar1uuaVB/CghzpnQlQjYpAR8VzvIu FOoAU45yh63+hdK0YlUVUAG0rXU8XJQ7ySrlwBmuohWRl6OKnMsDxn9TiUZtzQfGne sQIb7iNND2mynIfJ2Xoj6IBvilTUcah2HuxCqIYK37Y2IvnKONaAw2UgMTTtcGYj7y QgMqORZAU8LAA== From: Jarkko Sakkinen To: Jarkko Sakkinen , Dave Hansen , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Jonathan Corbet Cc: reinette.chatre@intel.com, tony.luck@intel.com, Greg Kroah-Hartman , linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v6 2/2] x86/sgx: Add an attribute for the amount of SGX memory in a NUMA node Date: Tue, 28 Sep 2021 06:13:50 +0300 Message-Id: <20210928031350.63464-2-jarkko@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210928031350.63464-1-jarkko@kernel.org> References: <20210928031350.63464-1-jarkko@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org The amount of SGX memory on the system is determined by the BIOS and it varies wildly between systems. It can be from dozens of MB's on desktops or VM's, up to many GB's on servers. Just like for regular memory, it is sometimes useful to know the amount of usable SGX memory in the system. Add an attribute for the amount of SGX memory in bytes to each NUMA node. The path is /sys/devices/system/node/node[0-9]*/sgx/memory_size. Calculate these values by summing up EPC section sizes for each node during the driver initalization. Cc: Greg Kroah-Hartman Signed-off-by: Jarkko Sakkinen --- v6: * Initialize node->size to zero in sgx_setup_epc_section(), when the node is first accessed. The bug report: https://lore.kernel.org/linux-sgx/f45245ba-41b8-62ae-38b5-64725a214bad@intel.com/ v5: * A new patch based on the discussion on https://lore.kernel.org/linux-sgx/3a7cab4115b4f902f3509ad8652e616b91703e1d.camel@kernel.org/T/#t Documentation/x86/sgx.rst | 14 ++++++ arch/x86/kernel/cpu/sgx/main.c | 91 ++++++++++++++++++++++++++++++++++ arch/x86/kernel/cpu/sgx/sgx.h | 2 + 3 files changed, 107 insertions(+) diff --git a/Documentation/x86/sgx.rst b/Documentation/x86/sgx.rst index dd0ac96ff9ef..f9d9cfa6dbf9 100644 --- a/Documentation/x86/sgx.rst +++ b/Documentation/x86/sgx.rst @@ -250,3 +250,17 @@ user wants to deploy SGX applications both on the host and in guests on the same machine, the user should reserve enough EPC (by taking out total virtual EPC size of all SGX VMs from the physical EPC size) for host SGX applications so they can run with acceptable performance. + +Per NUMA node SGX attributes +============================ + +NUMA nodes devices expose SGX specific attributes in the following path: + + /sys/devices/system/node/node[0-9]*/sgx/ + +Attributes +---------- + +memory_size + Total available physical SGX memory, also known as Enclave + Page Cache (EPC), in bytes. diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index a6e313f1a82d..4f1e3b5e3d14 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -714,9 +714,11 @@ static bool __init sgx_page_cache_init(void) spin_lock_init(&sgx_numa_nodes[nid].lock); INIT_LIST_HEAD(&sgx_numa_nodes[nid].free_page_list); node_set(nid, sgx_numa_mask); + sgx_numa_nodes[nid].size = 0; } sgx_epc_sections[i].node = &sgx_numa_nodes[nid]; + sgx_numa_nodes[nid].size += size; sgx_nr_epc_sections++; } @@ -790,6 +792,87 @@ int sgx_set_attribute(unsigned long *allowed_attributes, } EXPORT_SYMBOL_GPL(sgx_set_attribute); +#ifdef CONFIG_NUMA +static void sgx_numa_exit(void) +{ + int nid; + + for (nid = 0; nid < num_possible_nodes(); nid++) { + if (!sgx_numa_nodes[nid].kobj) + continue; + + kobject_put(sgx_numa_nodes[nid].kobj); + } +} + +#define SGX_NODE_ATTR_RO(_name) \ + static struct kobj_attribute _name##_attr = __ATTR_RO(_name) + +static ssize_t memory_size_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + unsigned long size = 0; + int nid; + + for (nid = 0; nid < num_possible_nodes(); nid++) { + if (kobj == sgx_numa_nodes[nid].kobj) { + size = sgx_numa_nodes[nid].size; + break; + } + } + + return sysfs_emit(buf, "%lu\n", size); +} +SGX_NODE_ATTR_RO(memory_size); + +static struct attribute *sgx_node_attrs[] = { + &memory_size_attr.attr, + NULL, +}; + +static const struct attribute_group sgx_node_attr_group = { + .attrs = sgx_node_attrs, +}; + +static bool sgx_numa_init(void) +{ + struct sgx_numa_node *node; + struct device *dev; + int nid; + int ret; + + for (nid = 0; nid < num_possible_nodes(); nid++) { + if (!sgx_numa_nodes[nid].size) + continue; + + node = &sgx_numa_nodes[nid]; + dev = &node_devices[nid]->dev; + + node->kobj = kobject_create_and_add("sgx", &dev->kobj); + if (!node->kobj) { + sgx_numa_exit(); + return false; + } + + ret = sysfs_create_group(node->kobj, &sgx_node_attr_group); + if (ret) { + sgx_numa_exit(); + return false; + } + } + + return true; +} +#else +static inline void sgx_numa_exit(void) +{ +} + +static inline bool sgx_numa_init(void) +{ + return true; +} +#endif /* CONFIG_NUMA */ + static int __init sgx_init(void) { int ret; @@ -806,6 +889,11 @@ static int __init sgx_init(void) goto err_reclaimer; } + if (!sgx_numa_init()) { + ret = -ENOMEM; + goto err_numa_nodes; + } + ret = misc_register(&sgx_dev_provision); if (ret) goto err_provision; @@ -829,6 +917,9 @@ static int __init sgx_init(void) misc_deregister(&sgx_dev_provision); err_provision: + sgx_numa_exit(); + +err_numa_nodes: kthread_stop(ksgxd_tsk); err_reclaimer: diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h index 4628acec0009..c2c5e7c66d21 100644 --- a/arch/x86/kernel/cpu/sgx/sgx.h +++ b/arch/x86/kernel/cpu/sgx/sgx.h @@ -39,6 +39,8 @@ struct sgx_epc_page { */ struct sgx_numa_node { struct list_head free_page_list; + struct kobject *kobj; + unsigned long size; spinlock_t lock; };