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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2026, Google LLC.
* Pasha Tatashin <pasha.tatashin@soleen.com>
*
* Validate that LUO can handle a large number of sessions across a kexec
* reboot.
*/
#include <stdio.h>
#include <unistd.h>
#include "luo_test_utils.h"
#define NUM_SESSIONS 2000
#define STATE_SESSION_NAME "kexec_many_state"
#define STATE_MEMFD_TOKEN 999
/* Stage 1: Executed before the kexec reboot. */
static void run_stage_1(int luo_fd)
{
int ret, i;
ksft_print_msg("[STAGE 1] Increasing ulimit for open files...\n");
ret = luo_ensure_nofile_limit(NUM_SESSIONS);
if (ret == -EPERM)
ksft_exit_skip("Insufficient privileges to set RLIMIT_NOFILE\n");
if (ret < 0)
ksft_exit_fail_msg("luo_ensure_nofile_limit failed: %s\n", strerror(-ret));
ksft_print_msg("[STAGE 1] Creating state file for next stage (2)...\n");
create_state_file(luo_fd, STATE_SESSION_NAME, STATE_MEMFD_TOKEN, 2);
ksft_print_msg("[STAGE 1] Creating %d sessions...\n", NUM_SESSIONS);
for (i = 0; i < NUM_SESSIONS; i++) {
char name[LIVEUPDATE_SESSION_NAME_LENGTH];
int s_fd;
snprintf(name, sizeof(name), "many-test-%d", i);
s_fd = luo_create_session(luo_fd, name);
if (s_fd < 0) {
fail_exit("luo_create_session for '%s' at index %d",
name, i);
}
}
ksft_print_msg("[STAGE 1] Successfully created %d sessions.\n",
NUM_SESSIONS);
close(luo_fd);
daemonize_and_wait();
}
/* Stage 2: Executed after the kexec reboot. */
static void run_stage_2(int luo_fd, int state_session_fd)
{
int i, stage;
ksft_print_msg("[STAGE 2] Starting post-kexec verification...\n");
restore_and_read_stage(state_session_fd, STATE_MEMFD_TOKEN, &stage);
if (stage != 2) {
fail_exit("Expected stage 2, but state file contains %d",
stage);
}
ksft_print_msg("[STAGE 2] Retrieving and finishing %d sessions...\n",
NUM_SESSIONS);
for (i = 0; i < NUM_SESSIONS; i++) {
char name[LIVEUPDATE_SESSION_NAME_LENGTH];
int s_fd;
snprintf(name, sizeof(name), "many-test-%d", i);
s_fd = luo_retrieve_session(luo_fd, name);
if (s_fd < 0) {
fail_exit("luo_retrieve_session for '%s' at index %d",
name, i);
}
if (luo_session_finish(s_fd) < 0) {
fail_exit("luo_session_finish for '%s' at index %d",
name, i);
}
close(s_fd);
}
ksft_print_msg("[STAGE 2] Finalizing state session...\n");
if (luo_session_finish(state_session_fd) < 0)
fail_exit("luo_session_finish for state session");
close(state_session_fd);
ksft_print_msg("\n--- MANY-SESSIONS KEXEC TEST PASSED (%d sessions) ---\n",
NUM_SESSIONS);
}
int main(int argc, char *argv[])
{
return luo_test(argc, argv, STATE_SESSION_NAME,
run_stage_1, run_stage_2);
}
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