From patchwork Wed Nov 3 01:28:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 12599951 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 384E4C433EF for ; Wed, 3 Nov 2021 01:28:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 193F4610E8 for ; Wed, 3 Nov 2021 01:28:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233346AbhKCBbC (ORCPT ); Tue, 2 Nov 2021 21:31:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:34544 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233336AbhKCBbB (ORCPT ); Tue, 2 Nov 2021 21:31:01 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 86E8360F39; Wed, 3 Nov 2021 01:28:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1635902906; bh=2tMr04KNLzMif2jez1s3bhKp50a/nDbwzfW7cTUsulM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ps0uamdzuDQp37tBCFP9yILm7lVsSrF/UDCpQARFiQqDg7kQ8QSaEp7uw9dfT1R7q mzskOlGP1zrQ1e9tbzoJ2r3e4trgESS68S/QahjVPjoEhbgjsiuXN4BoeVHrc4DbZ/ iG3PLGAna/n0onUKNFwF946OvJc/UoAhAXAJ/e0A9N1IWs2e0yl/DddcbV4RugZ47e qAj2zbFNfyFaOCstIznuW3jVLgra9xwdgkJ8r76NGVy9ri138kVT/qtyH98T3RMDZl TofVXnlHl4Ckvyd+Ty1snVOdN3NNbGyvvg/da9Y15WziojICmVYWR2baNN7SknheQ5 PzxLrwWG16z3Q== From: Jarkko Sakkinen To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Jarkko Sakkinen , Dave Hansen , Greg Kroah-Hartman , "Rafael J. Wysocki" Cc: reinette.chatre@intel.com, tony.luck@intel.com, nathaniel@profian.com, linux-kernel@vger.kernel.org, linux-sgx@vger.kernel.org Subject: [PATCH v11 2/2] x86/sgx: Add an attribute for the amount of SGX memory in a NUMA node Date: Wed, 3 Nov 2021 03:28:13 +0200 Message-Id: <20211103012813.670195-2-jarkko@kernel.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211103012813.670195-1-jarkko@kernel.org> References: <20211103012813.670195-1-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. Introduce CONFIG_HAVE_ARCH_NODE_DEV_GROUP opt-in flag to expose an arch specific attribute group, and add an attribute for the amount of SGX memory in bytes to each NUMA node: /sys/devices/system/node/nodeX/x86/sgx_total_bytes Cc: Greg Kroah-Hartman Signed-off-by: Jarkko Sakkinen --- v11: * Fix documentation and the commit message. v10: * Change DEVICE_ATTR_RO() to static (Greg K-H) * Change the attribute name as sgx_total_bytes, and attribute group name as "x86" (Dave). * Add a new config flag HAVE_ARCH_NODE_DEV_GROUP to identify, whether an arch exports arch specific attribute group for NUMA nodes. v9: * Fix racy initialization of sysfs attributes: https://lore.kernel.org/linux-sgx/YXOsx8SvFJV5R7lU@kroah.com/ v8: * Fix a bug in sgx_numa_init(): node->dev should be only set after sysfe_create_group(). Otherwise, sysfs_remove_group() will issue a warning in sgx_numa_exit(), when sgx_create_group() is unsuccessful, because the group does not exist. v7: * Shorten memory_size to size. The prefix makes the name only longer but does not clarify things more than "size" would. * Use device_attribute instead of kobj_attribute. * Use named attribute group instead of creating raw kobject just for the "sgx" subdirectory. v6: * Initialize node->size to zero in sgx_setup_epc_section(), when the node is first accessed. v5 * A new patch based on the discussion on https://lore.kernel.org/linux-sgx/3a7cab4115b4f902f3509ad8652e616b91703e1d.camel@kernel.org/T/#t --- Documentation/ABI/stable/sysfs-devices-node | 6 ++++ arch/Kconfig | 4 +++ arch/x86/Kconfig | 1 + arch/x86/kernel/cpu/sgx/main.c | 31 +++++++++++++++++++++ arch/x86/kernel/cpu/sgx/sgx.h | 2 ++ drivers/base/node.c | 13 ++++++++- include/linux/numa.h | 4 +++ 7 files changed, 60 insertions(+), 1 deletion(-) diff --git a/Documentation/ABI/stable/sysfs-devices-node b/Documentation/ABI/stable/sysfs-devices-node index 484fc04bcc25..8db67aa472f1 100644 --- a/Documentation/ABI/stable/sysfs-devices-node +++ b/Documentation/ABI/stable/sysfs-devices-node @@ -176,3 +176,9 @@ Contact: Keith Busch Description: The cache write policy: 0 for write-back, 1 for write-through, other or unknown. + +What: /sys/devices/system/node/nodeX/x86/sgx_total_bytes +Date: November 2021 +Contact: Jarkko Sakkinen +Description: + The total amount of SGX physical memory in bytes. diff --git a/arch/Kconfig b/arch/Kconfig index 98db63496bab..ca5d75b5a427 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -1285,6 +1285,10 @@ config ARCH_HAS_ELFCORE_COMPAT config ARCH_HAS_PARANOID_L1D_FLUSH bool +# Select, if arch has a named attribute group bound to NUMA device nodes. +config HAVE_ARCH_NODE_DEV_GROUP + bool + source "kernel/gcov/Kconfig" source "scripts/gcc-plugins/Kconfig" diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 421fa9e38c60..8503c3bdf63f 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -266,6 +266,7 @@ config X86 select HAVE_ARCH_KCSAN if X86_64 select X86_FEATURE_NAMES if PROC_FS select PROC_PID_ARCH_STATUS if PROC_FS + select HAVE_ARCH_NODE_DEV_GROUP if X86_SGX imply IMA_SECURE_AND_OR_TRUSTED_BOOT if EFI config INSTRUCTION_DECODER diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index a6e313f1a82d..02ebb233c511 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -714,9 +714,12 @@ 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].dev = &node_devices[nid]->dev; + sgx_numa_nodes[nid].size += size; sgx_nr_epc_sections++; } @@ -790,6 +793,34 @@ int sgx_set_attribute(unsigned long *allowed_attributes, } EXPORT_SYMBOL_GPL(sgx_set_attribute); +#ifdef CONFIG_NUMA +static ssize_t sgx_total_bytes_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + unsigned long size = 0; + int nid; + + for (nid = 0; nid < num_possible_nodes(); nid++) { + if (dev == sgx_numa_nodes[nid].dev) { + size = sgx_numa_nodes[nid].size; + break; + } + } + + return sysfs_emit(buf, "%lu\n", size); +} +static DEVICE_ATTR_RO(sgx_total_bytes); + +static struct attribute *arch_node_dev_attrs[] = { + &dev_attr_sgx_total_bytes.attr, + NULL, +}; + +const struct attribute_group arch_node_dev_group = { + .name = "x86", + .attrs = arch_node_dev_attrs, +}; +#endif /* CONFIG_NUMA */ + static int __init sgx_init(void) { int ret; diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h index 4628acec0009..1de8c627a286 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 device *dev; + unsigned long size; spinlock_t lock; }; diff --git a/drivers/base/node.c b/drivers/base/node.c index 4a4ae868ad9f..8da977895b9a 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -565,7 +565,18 @@ static struct attribute *node_dev_attrs[] = { &dev_attr_vmstat.attr, NULL }; -ATTRIBUTE_GROUPS(node_dev); + +static const struct attribute_group node_dev_group = { + .attrs = node_dev_attrs, +}; + +static const struct attribute_group *node_dev_groups[] = { + &node_dev_group, +#ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP + &arch_node_dev_group, +#endif + NULL, +}; #ifdef CONFIG_HUGETLBFS /* diff --git a/include/linux/numa.h b/include/linux/numa.h index cb44cfe2b725..59df211d051f 100644 --- a/include/linux/numa.h +++ b/include/linux/numa.h @@ -58,4 +58,8 @@ static inline int phys_to_target_node(u64 start) } #endif +#ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP +extern const struct attribute_group arch_node_dev_group; +#endif + #endif /* _LINUX_NUMA_H */