@@ -176,3 +176,10 @@ Contact: Keith Busch <keith.busch@intel.com>
Description:
The cache write policy: 0 for write-back, 1 for write-through,
other or unknown.
+
+What: /sys/devices/system/node/nodeX/sgx/size
+Date: October 2021
+Contact: Jarkko Sakkinen <jarkko@kernel.org>
+Description:
+ Total available physical SGX memory, also known as Enclave Page
+ Cache (EPC), in bytes.
@@ -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"
@@ -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
@@ -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;
@@ -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;
};
@@ -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
/*
@@ -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 */
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/size. Calculate these values by summing up EPC section sizes for each node during the driver initalization. Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org> --- 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 | 7 +++++ 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, 61 insertions(+), 1 deletion(-)