--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ */
+
+/**
+ * DOC: Enclave lifetime management driver for Nitro Enclaves (NE).
+ * Nitro is a hypervisor that has been developed by Amazon.
+ */
+
+#include <linux/anon_inodes.h>
+#include <linux/capability.h>
+#include <linux/cpu.h>
+#include <linux/device.h>
+#include <linux/file.h>
+#include <linux/hugetlb.h>
+#include <linux/limits.h>
+#include <linux/list.h>
+#include <linux/miscdevice.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/nitro_enclaves.h>
+#include <linux/pci.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <uapi/linux/vm_sockets.h>
+
+#include "ne_misc_dev.h"
+#include "ne_pci_dev.h"
+
+/**
+ * NE_CPUS_SIZE - Size for max 128 CPUs, for now, in a cpu-list string, comma
+ * separated. The NE CPU pool includes CPUs from a single NUMA
+ * node.
+ */
+#define NE_CPUS_SIZE (512)
+
+/**
+ * NE_EIF_LOAD_OFFSET - The offset where to copy the Enclave Image Format (EIF)
+ * image in enclave memory.
+ */
+#define NE_EIF_LOAD_OFFSET (8 * 1024UL * 1024UL)
+
+/**
+ * NE_MIN_ENCLAVE_MEM_SIZE - The minimum memory size an enclave can be launched
+ * with.
+ */
+#define NE_MIN_ENCLAVE_MEM_SIZE (64 * 1024UL * 1024UL)
+
+/**
+ * NE_MIN_MEM_REGION_SIZE - The minimum size of an enclave memory region.
+ */
+#define NE_MIN_MEM_REGION_SIZE (2 * 1024UL * 1024UL)
+
+/**
+ * NE_PARENT_VM_CID - The CID for the vsock device of the primary / parent VM.
+ */
+#define NE_PARENT_VM_CID (3)
+
+static const struct file_operations ne_fops = {
+ .owner = THIS_MODULE,
+ .llseek = noop_llseek,
+};
+
+static struct miscdevice ne_misc_dev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "nitro_enclaves",
+ .fops = &ne_fops,
+ .mode = 0660,
+};
+
+struct ne_devs ne_devs = {
+ .ne_misc_dev = &ne_misc_dev,
+};
+
+/*
+ * TODO: Update logic to create new sysfs entries instead of using
+ * a kernel parameter e.g. if multiple sysfs files needed.
+ */
+static const struct kernel_param_ops ne_cpu_pool_ops = {
+ .get = param_get_string,
+};
+
+static char ne_cpus[NE_CPUS_SIZE];
+static struct kparam_string ne_cpus_arg = {
+ .maxlen = sizeof(ne_cpus),
+ .string = ne_cpus,
+};
+
+module_param_cb(ne_cpus, &ne_cpu_pool_ops, &ne_cpus_arg, 0644);
+/* https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html#cpu-lists */
+MODULE_PARM_DESC(ne_cpus, "<cpu-list> - CPU pool used for Nitro Enclaves");
+
+/**
+ * struct ne_cpu_pool - CPU pool used for Nitro Enclaves.
+ * @avail_threads_per_core: Available full CPU cores to be dedicated to
+ * enclave(s). The cpumasks from the array, indexed
+ * by core id, contain all the threads from the
+ * available cores, that are not set for created
+ * enclave(s). The full CPU cores are part of the
+ * NE CPU pool.
+ * @mutex: Mutex for the access to the NE CPU pool.
+ * @nr_parent_vm_cores : The size of the available threads per core array.
+ * The total number of CPU cores available on the
+ * primary / parent VM.
+ * @nr_threads_per_core: The number of threads that a full CPU core has.
+ * @numa_node: NUMA node of the CPUs in the pool.
+ */
+struct ne_cpu_pool {
+ cpumask_var_t *avail_threads_per_core;
+ struct mutex mutex;
+ unsigned int nr_parent_vm_cores;
+ unsigned int nr_threads_per_core;
+ int numa_node;
+};
+
+static struct ne_cpu_pool ne_cpu_pool;
+
+static int __init ne_init(void)
+{
+ mutex_init(&ne_cpu_pool.mutex);
+
+ return pci_register_driver(&ne_pci_driver);
+}
+
+static void __exit ne_exit(void)
+{
+ pci_unregister_driver(&ne_pci_driver);
+}
+
+module_init(ne_init);
+module_exit(ne_exit);
+
+MODULE_AUTHOR("Amazon.com, Inc. or its affiliates");
+MODULE_DESCRIPTION("Nitro Enclaves Driver");
+MODULE_LICENSE("GPL v2");
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