int before_block_exec(CPUState *env, TranslationBlock *tb) {
uint64_t count = rr_get_guest_instr_count();
if (!snipping && count+tb->icount > start_count) {
sassert((oldlog = fopen(rr_nondet_log->name, "r")), 8);
sassert(fread(&orig_last_prog_point, sizeof(RR_prog_point), 1, oldlog) == 1, 9);
printf("Original ending prog point: ");
rr_spit_prog_point(orig_last_prog_point);
actual_start_count = count;
printf("Saving snapshot at instr count %lu...\n", count);
// Force running state
global_state_store_running();
printf("writing snapshot:\t%s\n", snp_name);
QIOChannelFile* ioc =
qio_channel_file_new_path(snp_name, O_WRONLY | O_CREAT, 0660, NULL);
QEMUFile* snp = qemu_fopen_channel_output(QIO_CHANNEL(ioc));
qemu_savevm_state(snp, NULL);
qemu_fclose(snp);
printf("Beginning cut-and-paste process at prog point:\n");
rr_spit_prog_point(rr_prog_point());
printf("Writing entries to %s...\n", nondet_name);
newlog = fopen(nondet_name, "w");
sassert(newlog, 10);
// We'll fix this up later.
RR_prog_point prog_point = {0};
fwrite(&prog_point.guest_instr_count,
sizeof(prog_point.guest_instr_count), 1, newlog);
fseek(oldlog, ftell(rr_nondet_log->fp), SEEK_SET);
// If there are items in the queue, then start copying the log
// from there
RR_log_entry *item = rr_get_queue_head();
if (item != NULL) fseek(oldlog, item->header.file_pos, SEEK_SET);
while (prog_point.guest_instr_count < end_count && !feof(oldlog)) {
prog_point = copy_entry();
}
if (!feof(oldlog)) { // prog_point is the first one AFTER what we want
printf("Reached end of old nondet log.\n");
} else {
printf("Past desired ending point for log.\n");
}
snipping = true;
printf("Continuing with replay.\n");
}
if (snipping && !done && count > end_count) {
end_snip();
rr_end_replay_requested = 1;
}
return 0;
}
/* Duplicate temp_fd and seek to the beginning of the file */
static QEMUFile *open_test_file(bool write)
{
int fd = dup(temp_fd);
QIOChannel *ioc;
QEMUFile *f;
lseek(fd, 0, SEEK_SET);
if (write) {
g_assert_cmpint(ftruncate(fd, 0), ==, 0);
}
ioc = QIO_CHANNEL(qio_channel_file_new_fd(fd));
if (write) {
f = qemu_fopen_channel_output(ioc);
} else {
f = qemu_fopen_channel_input(ioc);
}
object_unref(OBJECT(ioc));
return f;
}
static void colo_process_checkpoint(MigrationState *s)
{
QIOChannelBuffer *bioc;
QEMUFile *fb = NULL;
int64_t current_time = qemu_clock_get_ms(QEMU_CLOCK_HOST);
Error *local_err = NULL;
int ret;
failover_init_state();
s->rp_state.from_dst_file = qemu_file_get_return_path(s->to_dst_file);
if (!s->rp_state.from_dst_file) {
error_report("Open QEMUFile from_dst_file failed");
goto out;
}
/*
* Wait for Secondary finish loading VM states and enter COLO
* restore.
*/
colo_receive_check_message(s->rp_state.from_dst_file,
COLO_MESSAGE_CHECKPOINT_READY, &local_err);
if (local_err) {
goto out;
}
bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc));
object_unref(OBJECT(bioc));
qemu_mutex_lock_iothread();
vm_start();
qemu_mutex_unlock_iothread();
trace_colo_vm_state_change("stop", "run");
timer_mod(s->colo_delay_timer,
current_time + s->parameters.x_checkpoint_delay);
while (s->state == MIGRATION_STATUS_COLO) {
if (failover_get_state() != FAILOVER_STATUS_NONE) {
error_report("failover request");
goto out;
}
qemu_sem_wait(&s->colo_checkpoint_sem);
ret = colo_do_checkpoint_transaction(s, bioc, fb);
if (ret < 0) {
goto out;
}
}
out:
/* Throw the unreported error message after exited from loop */
if (local_err) {
error_report_err(local_err);
}
if (fb) {
qemu_fclose(fb);
}
timer_del(s->colo_delay_timer);
/* Hope this not to be too long to wait here */
qemu_sem_wait(&s->colo_exit_sem);
qemu_sem_destroy(&s->colo_exit_sem);
/*
* Must be called after failover BH is completed,
* Or the failover BH may shutdown the wrong fd that
* re-used by other threads after we release here.
*/
if (s->rp_state.from_dst_file) {
qemu_fclose(s->rp_state.from_dst_file);
}
}
static void colo_process_checkpoint(MigrationState *s)
{
QIOChannelBuffer *bioc;
QEMUFile *fb = NULL;
int64_t current_time = qemu_clock_get_ms(QEMU_CLOCK_HOST);
Error *local_err = NULL;
int ret;
failover_init_state();
s->rp_state.from_dst_file = qemu_file_get_return_path(s->to_dst_file);
if (!s->rp_state.from_dst_file) {
error_report("Open QEMUFile from_dst_file failed");
goto out;
}
packets_compare_notifier.notify = colo_compare_notify_checkpoint;
colo_compare_register_notifier(&packets_compare_notifier);
/*
* Wait for Secondary finish loading VM states and enter COLO
* restore.
*/
colo_receive_check_message(s->rp_state.from_dst_file,
COLO_MESSAGE_CHECKPOINT_READY, &local_err);
if (local_err) {
goto out;
}
bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc));
object_unref(OBJECT(bioc));
qemu_mutex_lock_iothread();
#ifdef CONFIG_REPLICATION
replication_start_all(REPLICATION_MODE_PRIMARY, &local_err);
if (local_err) {
qemu_mutex_unlock_iothread();
goto out;
}
#else
abort();
#endif
vm_start();
qemu_mutex_unlock_iothread();
trace_colo_vm_state_change("stop", "run");
timer_mod(s->colo_delay_timer,
current_time + s->parameters.x_checkpoint_delay);
while (s->state == MIGRATION_STATUS_COLO) {
if (failover_get_state() != FAILOVER_STATUS_NONE) {
error_report("failover request");
goto out;
}
qemu_sem_wait(&s->colo_checkpoint_sem);
if (s->state != MIGRATION_STATUS_COLO) {
goto out;
}
ret = colo_do_checkpoint_transaction(s, bioc, fb);
if (ret < 0) {
goto out;
}
}
out:
/* Throw the unreported error message after exited from loop */
if (local_err) {
error_report_err(local_err);
}
if (fb) {
qemu_fclose(fb);
}
/*
* There are only two reasons we can get here, some error happened
* or the user triggered failover.
*/
switch (failover_get_state()) {
case FAILOVER_STATUS_NONE:
qapi_event_send_colo_exit(COLO_MODE_PRIMARY,
COLO_EXIT_REASON_ERROR);
break;
case FAILOVER_STATUS_REQUIRE:
qapi_event_send_colo_exit(COLO_MODE_PRIMARY,
COLO_EXIT_REASON_REQUEST);
break;
default:
abort();
}
/* Hope this not to be too long to wait here */
qemu_sem_wait(&s->colo_exit_sem);
qemu_sem_destroy(&s->colo_exit_sem);
/*
* It is safe to unregister notifier after failover finished.
* Besides, colo_delay_timer and colo_checkpoint_sem can't be
* released befor unregister notifier, or there will be use-after-free
* error.
*/
colo_compare_unregister_notifier(&packets_compare_notifier);
timer_del(s->colo_delay_timer);
timer_free(s->colo_delay_timer);
qemu_sem_destroy(&s->colo_checkpoint_sem);
/*
* Must be called after failover BH is completed,
* Or the failover BH may shutdown the wrong fd that
* re-used by other threads after we release here.
*/
if (s->rp_state.from_dst_file) {
qemu_fclose(s->rp_state.from_dst_file);
}
}