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 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright 2020-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  */
 
 /**
  * DOC: Sample flow of using the ioctl interface provided by the Nitro Enclaves (NE)
  * kernel driver.
  *
  * Usage
  * -----
  *
  * Load the nitro_enclaves module, setting also the enclave CPU pool. The
  * enclave CPUs need to be full cores from the same NUMA node. CPU 0 and its
  * siblings have to remain available for the primary / parent VM, so they
  * cannot be included in the enclave CPU pool.
  *
  * See the cpu list section from the kernel documentation.
  * https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html#cpu-lists
  *
  *  insmod drivers/virt/nitro_enclaves/nitro_enclaves.ko
  *  lsmod
  *
  *  The CPU pool can be set at runtime, after the kernel module is loaded.
  *
  *  echo <cpu-list> > /sys/module/nitro_enclaves/parameters/ne_cpus
  *
  *  NUMA and CPU siblings information can be found using:
  *
  *  lscpu
  *  /proc/cpuinfo
  *
  * Check the online / offline CPU list. The CPUs from the pool should be
  * offlined.
  *
  *  lscpu
  *
  * Check dmesg for any warnings / errors through the NE driver lifetime / usage.
  * The NE logs contain the "nitro_enclaves" or "pci 0000:00:02.0" pattern.
  *
  *  dmesg
  *
  * Setup hugetlbfs huge pages. The memory needs to be from the same NUMA node as
  * the enclave CPUs.
  *
  * https://www.kernel.org/doc/html/latest/admin-guide/mm/hugetlbpage.html
  *
  * By default, the allocation of hugetlb pages are distributed on all possible
  * NUMA nodes. Use the following configuration files to set the number of huge
  * pages from a NUMA node:
  *
  *  /sys/devices/system/node/node<X>/hugepages/hugepages-2048kB/nr_hugepages
  *  /sys/devices/system/node/node<X>/hugepages/hugepages-1048576kB/nr_hugepages
  *
  *  or, if not on a system with multiple NUMA nodes, can also set the number
  *  of 2 MiB / 1 GiB huge pages using
  *
  *  /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
  *  /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages
  *
  *  In this example 256 hugepages of 2 MiB are used.
  *
  * Build and run the NE sample.
  *
  *  make -C samples/nitro_enclaves clean
  *  make -C samples/nitro_enclaves
  *  ./samples/nitro_enclaves/ne_ioctl_sample <path_to_enclave_image>
  *
  * Unload the nitro_enclaves module.
  *
  *  rmmod nitro_enclaves
  *  lsmod
  */
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <poll.h>
 #include <pthread.h>
 #include <string.h>
 #include <sys/eventfd.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include <linux/mman.h>
 #include <linux/nitro_enclaves.h>
 #include <linux/vm_sockets.h>
 
 /**
  * NE_DEV_NAME - Nitro Enclaves (NE) misc device that provides the ioctl interface.
  */
 #define NE_DEV_NAME         "/dev/nitro_enclaves"
 
 /**
  * NE_POLL_WAIT_TIME - Timeout in seconds for each poll event.
  */
 #define NE_POLL_WAIT_TIME       (60)
 /**
  * NE_POLL_WAIT_TIME_MS - Timeout in milliseconds for each poll event.
  */
 #define NE_POLL_WAIT_TIME_MS        (NE_POLL_WAIT_TIME * 1000)
 
 /**
  * NE_SLEEP_TIME - Amount of time in seconds for the process to keep the enclave alive.
  */
 #define NE_SLEEP_TIME           (300)
 
 /**
  * NE_DEFAULT_NR_VCPUS - Default number of vCPUs set for an enclave.
  */
 #define NE_DEFAULT_NR_VCPUS     (2)
 
 /**
  * NE_MIN_MEM_REGION_SIZE - Minimum size of a memory region - 2 MiB.
  */
 #define NE_MIN_MEM_REGION_SIZE      (2 * 1024 * 1024)
 
 /**
  * NE_DEFAULT_NR_MEM_REGIONS - Default number of memory regions of 2 MiB set for
  *                 an enclave.
  */
 #define NE_DEFAULT_NR_MEM_REGIONS   (256)
 
 /**
  * NE_IMAGE_LOAD_HEARTBEAT_CID - Vsock CID for enclave image loading heartbeat logic.
  */
 #define NE_IMAGE_LOAD_HEARTBEAT_CID (3)
 /**
  * NE_IMAGE_LOAD_HEARTBEAT_PORT - Vsock port for enclave image loading heartbeat logic.
  */
 #define NE_IMAGE_LOAD_HEARTBEAT_PORT    (9000)
 /**
  * NE_IMAGE_LOAD_HEARTBEAT_VALUE - Heartbeat value for enclave image loading.
  */
 #define NE_IMAGE_LOAD_HEARTBEAT_VALUE   (0xb7)
 
 /**
  * struct ne_user_mem_region - User space memory region set for an enclave.
  * @userspace_addr: Address of the user space memory region.
  * @memory_size:    Size of the user space memory region.
  */
 struct ne_user_mem_region {
     void    *userspace_addr;
     size_t  memory_size;
 };
 
 /**
  * ne_create_vm() - Create a slot for the enclave VM.
  * @ne_dev_fd:      The file descriptor of the NE misc device.
  * @slot_uid:       The generated slot uid for the enclave.
  * @enclave_fd :    The generated file descriptor for the enclave.
  *
  * Context: Process context.
  * Return:
  * * 0 on success.
  * * Negative return value on failure.
  */
 static int ne_create_vm(int ne_dev_fd, unsigned long *slot_uid, int *enclave_fd)
 {
     int rc = -EINVAL;
     *enclave_fd = ioctl(ne_dev_fd, NE_CREATE_VM, slot_uid);
 
     if (*enclave_fd < 0) {
         rc = *enclave_fd;
         switch (errno) {
         case NE_ERR_NO_CPUS_AVAIL_IN_POOL: {
             printf("Error in create VM, no CPUs available in the NE CPU pool\n");
 
             break;
         }
 
         default:
             printf("Error in create VM [%m]\n");
         }
 
         return rc;
     }
 
     return 0;
 }
 
 /**
  * ne_poll_enclave_fd() - Thread function for polling the enclave fd.
  * @data:   Argument provided for the polling function.
  *
  * Context: Process context.
  * Return:
  * * NULL on success / failure.
  */
 void *ne_poll_enclave_fd(void *data)
 {
     int enclave_fd = *(int *)data;
     struct pollfd fds[1] = {};
     int i = 0;
     int rc = -EINVAL;
 
     printf("Running from poll thread, enclave fd %d\n", enclave_fd);
 
     fds[0].fd = enclave_fd;
     fds[0].events = POLLIN | POLLERR | POLLHUP;
 
     /* Keep on polling until the current process is terminated. */
     while (1) {
         printf("[iter %d] Polling ...\n", i);
 
         rc = poll(fds, 1, NE_POLL_WAIT_TIME_MS);
         if (rc < 0) {
             printf("Error in poll [%m]\n");
 
             return NULL;
         }
 
         i++;
 
         if (!rc) {
             printf("Poll: %d seconds elapsed\n",
                    i * NE_POLL_WAIT_TIME);
 
             continue;
         }
 
         printf("Poll received value 0x%x\n", fds[0].revents);
 
         if (fds[0].revents & POLLHUP) {
             printf("Received POLLHUP\n");
 
             return NULL;
         }
 
         if (fds[0].revents & POLLNVAL) {
             printf("Received POLLNVAL\n");
 
             return NULL;
         }
     }
 
     return NULL;
 }
 
 /**
  * ne_alloc_user_mem_region() - Allocate a user space memory region for an enclave.
  * @ne_user_mem_region: User space memory region allocated using hugetlbfs.
  *
  * Context: Process context.
  * Return:
  * * 0 on success.
  * * Negative return value on failure.
  */
 static int ne_alloc_user_mem_region(struct ne_user_mem_region *ne_user_mem_region)
 {
     /**
      * Check available hugetlb encodings for different huge page sizes in
      * include/uapi/linux/mman.h.
      */
     ne_user_mem_region->userspace_addr = mmap(NULL, ne_user_mem_region->memory_size,
                           PROT_READ | PROT_WRITE,
                           MAP_PRIVATE | MAP_ANONYMOUS |
                           MAP_HUGETLB | MAP_HUGE_2MB, -1, 0);
     if (ne_user_mem_region->userspace_addr == MAP_FAILED) {
         printf("Error in mmap memory [%m]\n");
 
         return -1;
     }
 
     return 0;
 }
 
 /**
  * ne_load_enclave_image() - Place the enclave image in the enclave memory.
  * @enclave_fd :        The file descriptor associated with the enclave.
  * @ne_user_mem_regions:    User space memory regions allocated for the enclave.
  * @enclave_image_path :    The file path of the enclave image.
  *
  * Context: Process context.
  * Return:
  * * 0 on success.
  * * Negative return value on failure.
  */
 static int ne_load_enclave_image(int enclave_fd, struct ne_user_mem_region ne_user_mem_regions[],
                  char *enclave_image_path)
 {
     unsigned char *enclave_image = NULL;
     int enclave_image_fd = -1;
     size_t enclave_image_size = 0;
     size_t enclave_memory_size = 0;
     unsigned long i = 0;
     size_t image_written_bytes = 0;
     struct ne_image_load_info image_load_info = {
         .flags = NE_EIF_IMAGE,
     };
     struct stat image_stat_buf = {};
     int rc = -EINVAL;
     size_t temp_image_offset = 0;
 
     for (i = 0; i < NE_DEFAULT_NR_MEM_REGIONS; i++)
         enclave_memory_size += ne_user_mem_regions[i].memory_size;
 
     rc = stat(enclave_image_path, &image_stat_buf);
     if (rc < 0) {
         printf("Error in get image stat info [%m]\n");
 
         return rc;
     }
 
     enclave_image_size = image_stat_buf.st_size;
 
     if (enclave_memory_size < enclave_image_size) {
         printf("The enclave memory is smaller than the enclave image size\n");
 
         return -ENOMEM;
     }
 
     rc = ioctl(enclave_fd, NE_GET_IMAGE_LOAD_INFO, &image_load_info);
     if (rc < 0) {
         switch (errno) {
         case NE_ERR_NOT_IN_INIT_STATE: {
             printf("Error in get image load info, enclave not in init state\n");
 
             break;
         }
 
         case NE_ERR_INVALID_FLAG_VALUE: {
             printf("Error in get image load info, provided invalid flag\n");
 
             break;
         }
 
         default:
             printf("Error in get image load info [%m]\n");
         }
 
         return rc;
     }
 
     printf("Enclave image offset in enclave memory is %lld\n",
            image_load_info.memory_offset);
 
     enclave_image_fd = open(enclave_image_path, O_RDONLY);
     if (enclave_image_fd < 0) {
         printf("Error in open enclave image file [%m]\n");
 
         return enclave_image_fd;
     }
 
     enclave_image = mmap(NULL, enclave_image_size, PROT_READ,
                  MAP_PRIVATE, enclave_image_fd, 0);
     if (enclave_image == MAP_FAILED) {
         printf("Error in mmap enclave image [%m]\n");
 
         return -1;
     }
 
     temp_image_offset = image_load_info.memory_offset;
 
     for (i = 0; i < NE_DEFAULT_NR_MEM_REGIONS; i++) {
         size_t bytes_to_write = 0;
         size_t memory_offset = 0;
         size_t memory_size = ne_user_mem_regions[i].memory_size;
         size_t remaining_bytes = 0;
         void *userspace_addr = ne_user_mem_regions[i].userspace_addr;
 
         if (temp_image_offset >= memory_size) {
             temp_image_offset -= memory_size;
 
             continue;
         } else if (temp_image_offset != 0) {
             memory_offset = temp_image_offset;
             memory_size -= temp_image_offset;
             temp_image_offset = 0;
         }
 
         remaining_bytes = enclave_image_size - image_written_bytes;
         bytes_to_write = memory_size < remaining_bytes ?
                  memory_size : remaining_bytes;
 
         memcpy(userspace_addr + memory_offset,
                enclave_image + image_written_bytes, bytes_to_write);
 
         image_written_bytes += bytes_to_write;
 
         if (image_written_bytes == enclave_image_size)
             break;
     }
 
     munmap(enclave_image, enclave_image_size);
 
     close(enclave_image_fd);
 
     return 0;
 }
 
 /**
  * ne_set_user_mem_region() - Set a user space memory region for the given enclave.
  * @enclave_fd :        The file descriptor associated with the enclave.
  * @ne_user_mem_region :    User space memory region to be set for the enclave.
  *
  * Context: Process context.
  * Return:
  * * 0 on success.
  * * Negative return value on failure.
  */
 static int ne_set_user_mem_region(int enclave_fd, struct ne_user_mem_region ne_user_mem_region)
 {
     struct ne_user_memory_region mem_region = {
         .flags = NE_DEFAULT_MEMORY_REGION,
         .memory_size = ne_user_mem_region.memory_size,
         .userspace_addr = (__u64)ne_user_mem_region.userspace_addr,
     };
     int rc = -EINVAL;
 
     rc = ioctl(enclave_fd, NE_SET_USER_MEMORY_REGION, &mem_region);
     if (rc < 0) {
         switch (errno) {
         case NE_ERR_NOT_IN_INIT_STATE: {
             printf("Error in set user memory region, enclave not in init state\n");
 
             break;
         }
 
         case NE_ERR_INVALID_MEM_REGION_SIZE: {
             printf("Error in set user memory region, mem size not multiple of 2 MiB\n");
 
             break;
         }
 
         case NE_ERR_INVALID_MEM_REGION_ADDR: {
             printf("Error in set user memory region, invalid user space address\n");
 
             break;
         }
 
         case NE_ERR_UNALIGNED_MEM_REGION_ADDR: {
             printf("Error in set user memory region, unaligned user space address\n");
 
             break;
         }
 
         case NE_ERR_MEM_REGION_ALREADY_USED: {
             printf("Error in set user memory region, memory region already used\n");
 
             break;
         }
 
         case NE_ERR_MEM_NOT_HUGE_PAGE: {
             printf("Error in set user memory region, not backed by huge pages\n");
 
             break;
         }
 
         case NE_ERR_MEM_DIFFERENT_NUMA_NODE: {
             printf("Error in set user memory region, different NUMA node than CPUs\n");
 
             break;
         }
 
         case NE_ERR_MEM_MAX_REGIONS: {
             printf("Error in set user memory region, max memory regions reached\n");
 
             break;
         }
 
         case NE_ERR_INVALID_PAGE_SIZE: {
             printf("Error in set user memory region, has page not multiple of 2 MiB\n");
 
             break;
         }
 
         case NE_ERR_INVALID_FLAG_VALUE: {
             printf("Error in set user memory region, provided invalid flag\n");
 
             break;
         }
 
         default:
             printf("Error in set user memory region [%m]\n");
         }
 
         return rc;
     }
 
     return 0;
 }
 
 /**
  * ne_free_mem_regions() - Unmap all the user space memory regions that were set
  *             aside for the enclave.
  * @ne_user_mem_regions:    The user space memory regions associated with an enclave.
  *
  * Context: Process context.
  */
 static void ne_free_mem_regions(struct ne_user_mem_region ne_user_mem_regions[])
 {
     unsigned int i = 0;
 
     for (i = 0; i < NE_DEFAULT_NR_MEM_REGIONS; i++)
         munmap(ne_user_mem_regions[i].userspace_addr,
                ne_user_mem_regions[i].memory_size);
 }
 
 /**
  * ne_add_vcpu() - Add a vCPU to the given enclave.
  * @enclave_fd :    The file descriptor associated with the enclave.
  * @vcpu_id:        vCPU id to be set for the enclave, either provided or
  *          auto-generated (if provided vCPU id is 0).
  *
  * Context: Process context.
  * Return:
  * * 0 on success.
  * * Negative return value on failure.
  */
 static int ne_add_vcpu(int enclave_fd, unsigned int *vcpu_id)
 {
     int rc = -EINVAL;
 
     rc = ioctl(enclave_fd, NE_ADD_VCPU, vcpu_id);
     if (rc < 0) {
         switch (errno) {
         case NE_ERR_NO_CPUS_AVAIL_IN_POOL: {
             printf("Error in add vcpu, no CPUs available in the NE CPU pool\n");
 
             break;
         }
 
         case NE_ERR_VCPU_ALREADY_USED: {
             printf("Error in add vcpu, the provided vCPU is already used\n");
 
             break;
         }
 
         case NE_ERR_VCPU_NOT_IN_CPU_POOL: {
             printf("Error in add vcpu, the provided vCPU is not in the NE CPU pool\n");
 
             break;
         }
 
         case NE_ERR_VCPU_INVALID_CPU_CORE: {
             printf("Error in add vcpu, the core id of the provided vCPU is invalid\n");
 
             break;
         }
 
         case NE_ERR_NOT_IN_INIT_STATE: {
             printf("Error in add vcpu, enclave not in init state\n");
 
             break;
         }
 
         case NE_ERR_INVALID_VCPU: {
             printf("Error in add vcpu, the provided vCPU is out of avail CPUs range\n");
 
             break;
         }
 
         default:
             printf("Error in add vcpu [%m]\n");
         }
 
         return rc;
     }
 
     return 0;
 }
 
 /**
  * ne_start_enclave() - Start the given enclave.
  * @enclave_fd :        The file descriptor associated with the enclave.
  * @enclave_start_info :    Enclave metadata used for starting e.g. vsock CID.
  *
  * Context: Process context.
  * Return:
  * * 0 on success.
  * * Negative return value on failure.
  */
 static int ne_start_enclave(int enclave_fd,  struct ne_enclave_start_info *enclave_start_info)
 {
     int rc = -EINVAL;
 
     rc = ioctl(enclave_fd, NE_START_ENCLAVE, enclave_start_info);
     if (rc < 0) {
         switch (errno) {
         case NE_ERR_NOT_IN_INIT_STATE: {
             printf("Error in start enclave, enclave not in init state\n");
 
             break;
         }
 
         case NE_ERR_NO_MEM_REGIONS_ADDED: {
             printf("Error in start enclave, no memory regions have been added\n");
 
             break;
         }
 
         case NE_ERR_NO_VCPUS_ADDED: {
             printf("Error in start enclave, no vCPUs have been added\n");
 
             break;
         }
 
         case NE_ERR_FULL_CORES_NOT_USED: {
             printf("Error in start enclave, enclave has no full cores set\n");
 
             break;
         }
 
         case NE_ERR_ENCLAVE_MEM_MIN_SIZE: {
             printf("Error in start enclave, enclave memory is less than min size\n");
 
             break;
         }
 
         case NE_ERR_INVALID_FLAG_VALUE: {
             printf("Error in start enclave, provided invalid flag\n");
 
             break;
         }
 
         case NE_ERR_INVALID_ENCLAVE_CID: {
             printf("Error in start enclave, provided invalid enclave CID\n");
 
             break;
         }
 
         default:
             printf("Error in start enclave [%m]\n");
         }
 
         return rc;
     }
 
     return 0;
 }
 
 /**
  * ne_start_enclave_check_booted() - Start the enclave and wait for a heartbeat
  *                   from it, on a newly created vsock channel,
  *                   to check it has booted.
  * @enclave_fd :    The file descriptor associated with the enclave.
  *
  * Context: Process context.
  * Return:
  * * 0 on success.
  * * Negative return value on failure.
  */
 static int ne_start_enclave_check_booted(int enclave_fd)
 {
     struct sockaddr_vm client_vsock_addr = {};
     int client_vsock_fd = -1;
     socklen_t client_vsock_len = sizeof(client_vsock_addr);
     struct ne_enclave_start_info enclave_start_info = {};
     struct pollfd fds[1] = {};
     int rc = -EINVAL;
     unsigned char recv_buf = 0;
     struct sockaddr_vm server_vsock_addr = {
         .svm_family = AF_VSOCK,
         .svm_cid = NE_IMAGE_LOAD_HEARTBEAT_CID,
         .svm_port = NE_IMAGE_LOAD_HEARTBEAT_PORT,
     };
     int server_vsock_fd = -1;
 
     server_vsock_fd = socket(AF_VSOCK, SOCK_STREAM, 0);
     if (server_vsock_fd < 0) {
         rc = server_vsock_fd;
 
         printf("Error in socket [%m]\n");
 
         return rc;
     }
 
     rc = bind(server_vsock_fd, (struct sockaddr *)&server_vsock_addr,
           sizeof(server_vsock_addr));
     if (rc < 0) {
         printf("Error in bind [%m]\n");
 
         goto out;
     }
 
     rc = listen(server_vsock_fd, 1);
     if (rc < 0) {
         printf("Error in listen [%m]\n");
 
         goto out;
     }
 
     rc = ne_start_enclave(enclave_fd, &enclave_start_info);
     if (rc < 0)
         goto out;
 
     printf("Enclave started, CID %llu\n", enclave_start_info.enclave_cid);
 
     fds[0].fd = server_vsock_fd;
     fds[0].events = POLLIN;
 
     rc = poll(fds, 1, NE_POLL_WAIT_TIME_MS);
     if (rc < 0) {
         printf("Error in poll [%m]\n");
 
         goto out;
     }
 
     if (!rc) {
         printf("Poll timeout, %d seconds elapsed\n", NE_POLL_WAIT_TIME);
 
         rc = -ETIMEDOUT;
 
         goto out;
     }
 
     if ((fds[0].revents & POLLIN) == 0) {
         printf("Poll received value %d\n", fds[0].revents);
 
         rc = -EINVAL;
 
         goto out;
     }
 
     rc = accept(server_vsock_fd, (struct sockaddr *)&client_vsock_addr,
             &client_vsock_len);
     if (rc < 0) {
         printf("Error in accept [%m]\n");
 
         goto out;
     }
 
     client_vsock_fd = rc;
 
     /*
      * Read the heartbeat value that the init process in the enclave sends
      * after vsock connect.
      */
     rc = read(client_vsock_fd, &recv_buf, sizeof(recv_buf));
     if (rc < 0) {
         printf("Error in read [%m]\n");
 
         goto out;
     }
 
     if (rc != sizeof(recv_buf) || recv_buf != NE_IMAGE_LOAD_HEARTBEAT_VALUE) {
         printf("Read %d instead of %d\n", recv_buf,
                NE_IMAGE_LOAD_HEARTBEAT_VALUE);
 
         goto out;
     }
 
     /* Write the heartbeat value back. */
     rc = write(client_vsock_fd, &recv_buf, sizeof(recv_buf));
     if (rc < 0) {
         printf("Error in write [%m]\n");
 
         goto out;
     }
 
     rc = 0;
 
 out:
     close(server_vsock_fd);
 
     return rc;
 }
 
 int main(int argc, char *argv[])
 {
     int enclave_fd = -1;
     unsigned int i = 0;
     int ne_dev_fd = -1;
     struct ne_user_mem_region ne_user_mem_regions[NE_DEFAULT_NR_MEM_REGIONS] = {};
     unsigned int ne_vcpus[NE_DEFAULT_NR_VCPUS] = {};
     int rc = -EINVAL;
     pthread_t thread_id = 0;
     unsigned long slot_uid = 0;
 
     if (argc != 2) {
         printf("Usage: %s <path_to_enclave_image>\n", argv[0]);
 
         exit(EXIT_FAILURE);
     }
 
     if (strlen(argv[1]) >= PATH_MAX) {
         printf("The size of the path to enclave image is higher than max path\n");
 
         exit(EXIT_FAILURE);
     }
 
     ne_dev_fd = open(NE_DEV_NAME, O_RDWR | O_CLOEXEC);
     if (ne_dev_fd < 0) {
         printf("Error in open NE device [%m]\n");
 
         exit(EXIT_FAILURE);
     }
 
     printf("Creating enclave slot ...\n");
 
     rc = ne_create_vm(ne_dev_fd, &slot_uid, &enclave_fd);
 
     close(ne_dev_fd);
 
     if (rc < 0)
         exit(EXIT_FAILURE);
 
     printf("Enclave fd %d\n", enclave_fd);
 
     rc = pthread_create(&thread_id, NULL, ne_poll_enclave_fd, (void *)&enclave_fd);
     if (rc < 0) {
         printf("Error in thread create [%m]\n");
 
         close(enclave_fd);
 
         exit(EXIT_FAILURE);
     }
 
     for (i = 0; i < NE_DEFAULT_NR_MEM_REGIONS; i++) {
         ne_user_mem_regions[i].memory_size = NE_MIN_MEM_REGION_SIZE;
 
         rc = ne_alloc_user_mem_region(&ne_user_mem_regions[i]);
         if (rc < 0) {
             printf("Error in alloc userspace memory region, iter %d\n", i);
 
             goto release_enclave_fd;
         }
     }
 
     rc = ne_load_enclave_image(enclave_fd, ne_user_mem_regions, argv[1]);
     if (rc < 0)
         goto release_enclave_fd;
 
     for (i = 0; i < NE_DEFAULT_NR_MEM_REGIONS; i++) {
         rc = ne_set_user_mem_region(enclave_fd, ne_user_mem_regions[i]);
         if (rc < 0) {
             printf("Error in set memory region, iter %d\n", i);
 
             goto release_enclave_fd;
         }
     }
 
     printf("Enclave memory regions were added\n");
 
     for (i = 0; i < NE_DEFAULT_NR_VCPUS; i++) {
         /*
          * The vCPU is chosen from the enclave vCPU pool, if the value
          * of the vcpu_id is 0.
          */
         ne_vcpus[i] = 0;
         rc = ne_add_vcpu(enclave_fd, &ne_vcpus[i]);
         if (rc < 0) {
             printf("Error in add vcpu, iter %d\n", i);
 
             goto release_enclave_fd;
         }
 
         printf("Added vCPU %d to the enclave\n", ne_vcpus[i]);
     }
 
     printf("Enclave vCPUs were added\n");
 
     rc = ne_start_enclave_check_booted(enclave_fd);
     if (rc < 0) {
         printf("Error in the enclave start / image loading heartbeat logic [rc=%d]\n", rc);
 
         goto release_enclave_fd;
     }
 
     printf("Entering sleep for %d seconds ...\n", NE_SLEEP_TIME);
 
     sleep(NE_SLEEP_TIME);
 
     close(enclave_fd);
 
     ne_free_mem_regions(ne_user_mem_regions);
 
     exit(EXIT_SUCCESS);
 
 release_enclave_fd:
     close(enclave_fd);
     ne_free_mem_regions(ne_user_mem_regions);
 
     exit(EXIT_FAILURE);
 }

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