mirror of
https://gitlab.com/qemu-project/qemu.git
synced 2024-10-13 23:23:57 +03:00
94962ff00d
This reverts commit 1f881ea4a4
.
That commit causes reverse_debugging.py test failures, and does
not seem to solve the root cause of the problem x86-64 still
hangs in record/replay tests.
The problem with short-cutting the iowait that was taken during
record phase is that related events will not get consumed at the
same points (e.g., reading the clock).
A hang with zero icount always seems to be a symptom of an earlier
problem that has caused the recording to become out of synch with
the execution and consumption of events by replay.
Acked-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20240813050638.446172-6-npiggin@gmail.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240813202329.1237572-14-alex.bennee@linaro.org>
504 lines
13 KiB
C
504 lines
13 KiB
C
/*
|
|
* replay.c
|
|
*
|
|
* Copyright (c) 2010-2015 Institute for System Programming
|
|
* of the Russian Academy of Sciences.
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qapi/error.h"
|
|
#include "sysemu/cpu-timers.h"
|
|
#include "sysemu/replay.h"
|
|
#include "sysemu/runstate.h"
|
|
#include "replay-internal.h"
|
|
#include "qemu/main-loop.h"
|
|
#include "qemu/option.h"
|
|
#include "sysemu/cpus.h"
|
|
#include "qemu/error-report.h"
|
|
|
|
/* Current version of the replay mechanism.
|
|
Increase it when file format changes. */
|
|
#define REPLAY_VERSION 0xe0200c
|
|
/* Size of replay log header */
|
|
#define HEADER_SIZE (sizeof(uint32_t) + sizeof(uint64_t))
|
|
|
|
ReplayMode replay_mode = REPLAY_MODE_NONE;
|
|
char *replay_snapshot;
|
|
|
|
/* Name of replay file */
|
|
static char *replay_filename;
|
|
ReplayState replay_state;
|
|
static GSList *replay_blockers;
|
|
|
|
/* Replay breakpoints */
|
|
uint64_t replay_break_icount = -1ULL;
|
|
QEMUTimer *replay_break_timer;
|
|
|
|
/* Pretty print event names */
|
|
|
|
static const char *replay_async_event_name(ReplayAsyncEventKind event)
|
|
{
|
|
switch (event) {
|
|
#define ASYNC_EVENT(_x) case REPLAY_ASYNC_EVENT_ ## _x: return "ASYNC_EVENT_"#_x
|
|
ASYNC_EVENT(BH);
|
|
ASYNC_EVENT(BH_ONESHOT);
|
|
ASYNC_EVENT(INPUT);
|
|
ASYNC_EVENT(INPUT_SYNC);
|
|
ASYNC_EVENT(CHAR_READ);
|
|
ASYNC_EVENT(BLOCK);
|
|
ASYNC_EVENT(NET);
|
|
#undef ASYNC_EVENT
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
}
|
|
|
|
static const char *replay_clock_event_name(ReplayClockKind clock)
|
|
{
|
|
switch (clock) {
|
|
#define CLOCK_EVENT(_x) case REPLAY_CLOCK_ ## _x: return "CLOCK_" #_x
|
|
CLOCK_EVENT(HOST);
|
|
CLOCK_EVENT(VIRTUAL_RT);
|
|
#undef CLOCK_EVENT
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
}
|
|
|
|
/* Pretty print shutdown event names */
|
|
static const char *replay_shutdown_event_name(ShutdownCause cause)
|
|
{
|
|
switch (cause) {
|
|
#define SHUTDOWN_EVENT(_x) case SHUTDOWN_CAUSE_ ## _x: return "SHUTDOWN_CAUSE_" #_x
|
|
SHUTDOWN_EVENT(NONE);
|
|
SHUTDOWN_EVENT(HOST_ERROR);
|
|
SHUTDOWN_EVENT(HOST_QMP_QUIT);
|
|
SHUTDOWN_EVENT(HOST_QMP_SYSTEM_RESET);
|
|
SHUTDOWN_EVENT(HOST_SIGNAL);
|
|
SHUTDOWN_EVENT(HOST_UI);
|
|
SHUTDOWN_EVENT(GUEST_SHUTDOWN);
|
|
SHUTDOWN_EVENT(GUEST_RESET);
|
|
SHUTDOWN_EVENT(GUEST_PANIC);
|
|
SHUTDOWN_EVENT(SUBSYSTEM_RESET);
|
|
SHUTDOWN_EVENT(SNAPSHOT_LOAD);
|
|
#undef SHUTDOWN_EVENT
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
}
|
|
|
|
static const char *replay_checkpoint_event_name(enum ReplayCheckpoint checkpoint)
|
|
{
|
|
switch (checkpoint) {
|
|
#define CHECKPOINT_EVENT(_x) case CHECKPOINT_ ## _x: return "CHECKPOINT_" #_x
|
|
CHECKPOINT_EVENT(CLOCK_WARP_START);
|
|
CHECKPOINT_EVENT(CLOCK_WARP_ACCOUNT);
|
|
CHECKPOINT_EVENT(RESET_REQUESTED);
|
|
CHECKPOINT_EVENT(SUSPEND_REQUESTED);
|
|
CHECKPOINT_EVENT(CLOCK_VIRTUAL);
|
|
CHECKPOINT_EVENT(CLOCK_HOST);
|
|
CHECKPOINT_EVENT(CLOCK_VIRTUAL_RT);
|
|
CHECKPOINT_EVENT(INIT);
|
|
CHECKPOINT_EVENT(RESET);
|
|
#undef CHECKPOINT_EVENT
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
}
|
|
|
|
static const char *replay_event_name(enum ReplayEvents event)
|
|
{
|
|
/* First deal with the simple ones */
|
|
switch (event) {
|
|
#define EVENT(_x) case EVENT_ ## _x: return "EVENT_"#_x
|
|
EVENT(INSTRUCTION);
|
|
EVENT(INTERRUPT);
|
|
EVENT(EXCEPTION);
|
|
EVENT(CHAR_WRITE);
|
|
EVENT(CHAR_READ_ALL);
|
|
EVENT(AUDIO_OUT);
|
|
EVENT(AUDIO_IN);
|
|
EVENT(RANDOM);
|
|
#undef EVENT
|
|
default:
|
|
if (event >= EVENT_ASYNC && event <= EVENT_ASYNC_LAST) {
|
|
return replay_async_event_name(event - EVENT_ASYNC);
|
|
} else if (event >= EVENT_SHUTDOWN && event <= EVENT_SHUTDOWN_LAST) {
|
|
return replay_shutdown_event_name(event - EVENT_SHUTDOWN);
|
|
} else if (event >= EVENT_CLOCK && event <= EVENT_CLOCK_LAST) {
|
|
return replay_clock_event_name(event - EVENT_CLOCK);
|
|
} else if (event >= EVENT_CHECKPOINT && event <= EVENT_CHECKPOINT_LAST) {
|
|
return replay_checkpoint_event_name(event - EVENT_CHECKPOINT);
|
|
}
|
|
}
|
|
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
bool replay_next_event_is(int event)
|
|
{
|
|
bool res = false;
|
|
|
|
/* nothing to skip - not all instructions used */
|
|
if (replay_state.instruction_count != 0) {
|
|
assert(replay_state.data_kind == EVENT_INSTRUCTION);
|
|
return event == EVENT_INSTRUCTION;
|
|
}
|
|
|
|
while (true) {
|
|
unsigned int data_kind = replay_state.data_kind;
|
|
if (event == data_kind) {
|
|
res = true;
|
|
}
|
|
switch (data_kind) {
|
|
case EVENT_SHUTDOWN ... EVENT_SHUTDOWN_LAST:
|
|
replay_finish_event();
|
|
qemu_system_shutdown_request(data_kind - EVENT_SHUTDOWN);
|
|
break;
|
|
default:
|
|
/* clock, time_t, checkpoint and other events */
|
|
return res;
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
uint64_t replay_get_current_icount(void)
|
|
{
|
|
return icount_get_raw();
|
|
}
|
|
|
|
int replay_get_instructions(void)
|
|
{
|
|
int res = 0;
|
|
g_assert(replay_mutex_locked());
|
|
if (replay_next_event_is(EVENT_INSTRUCTION)) {
|
|
res = replay_state.instruction_count;
|
|
if (replay_break_icount != -1LL) {
|
|
uint64_t current = replay_get_current_icount();
|
|
assert(replay_break_icount >= current);
|
|
if (current + res > replay_break_icount) {
|
|
res = replay_break_icount - current;
|
|
}
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
void replay_account_executed_instructions(void)
|
|
{
|
|
if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
if (replay_state.instruction_count > 0) {
|
|
replay_advance_current_icount(replay_get_current_icount());
|
|
}
|
|
}
|
|
}
|
|
|
|
bool replay_exception(void)
|
|
{
|
|
|
|
if (replay_mode == REPLAY_MODE_RECORD) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_save_instructions();
|
|
replay_put_event(EVENT_EXCEPTION);
|
|
return true;
|
|
} else if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
bool res = replay_has_exception();
|
|
if (res) {
|
|
replay_finish_event();
|
|
}
|
|
return res;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool replay_has_exception(void)
|
|
{
|
|
bool res = false;
|
|
if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_account_executed_instructions();
|
|
res = replay_next_event_is(EVENT_EXCEPTION);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
bool replay_interrupt(void)
|
|
{
|
|
if (replay_mode == REPLAY_MODE_RECORD) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_save_instructions();
|
|
replay_put_event(EVENT_INTERRUPT);
|
|
return true;
|
|
} else if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
bool res = replay_has_interrupt();
|
|
if (res) {
|
|
replay_finish_event();
|
|
}
|
|
return res;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool replay_has_interrupt(void)
|
|
{
|
|
bool res = false;
|
|
if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_account_executed_instructions();
|
|
res = replay_next_event_is(EVENT_INTERRUPT);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
void replay_shutdown_request(ShutdownCause cause)
|
|
{
|
|
if (replay_mode == REPLAY_MODE_RECORD) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_put_event(EVENT_SHUTDOWN + cause);
|
|
}
|
|
}
|
|
|
|
bool replay_checkpoint(ReplayCheckpoint checkpoint)
|
|
{
|
|
assert(EVENT_CHECKPOINT + checkpoint <= EVENT_CHECKPOINT_LAST);
|
|
|
|
replay_save_instructions();
|
|
|
|
if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
if (replay_next_event_is(EVENT_CHECKPOINT + checkpoint)) {
|
|
replay_finish_event();
|
|
} else {
|
|
return false;
|
|
}
|
|
} else if (replay_mode == REPLAY_MODE_RECORD) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_put_event(EVENT_CHECKPOINT + checkpoint);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void replay_async_events(void)
|
|
{
|
|
static bool processing = false;
|
|
/*
|
|
* If we are already processing the events, recursion may occur
|
|
* in case of incorrect implementation when HW event modifies timers.
|
|
* Timer modification may invoke the icount warp, event processing,
|
|
* and cause the recursion.
|
|
*/
|
|
g_assert(!processing);
|
|
processing = true;
|
|
|
|
replay_save_instructions();
|
|
|
|
if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_read_events();
|
|
} else if (replay_mode == REPLAY_MODE_RECORD) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_save_events();
|
|
}
|
|
processing = false;
|
|
}
|
|
|
|
bool replay_has_event(void)
|
|
{
|
|
bool res = false;
|
|
if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_account_executed_instructions();
|
|
res = EVENT_CHECKPOINT <= replay_state.data_kind
|
|
&& replay_state.data_kind <= EVENT_CHECKPOINT_LAST;
|
|
res = res || (EVENT_ASYNC <= replay_state.data_kind
|
|
&& replay_state.data_kind <= EVENT_ASYNC_LAST);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
G_NORETURN void replay_sync_error(const char *error)
|
|
{
|
|
error_report("%s (insn total %"PRId64"/%d left, event %d is %s)", error,
|
|
replay_state.current_icount, replay_state.instruction_count,
|
|
replay_state.current_event,
|
|
replay_event_name(replay_state.data_kind));
|
|
abort();
|
|
}
|
|
|
|
static void replay_enable(const char *fname, int mode)
|
|
{
|
|
const char *fmode = NULL;
|
|
assert(!replay_file);
|
|
|
|
switch (mode) {
|
|
case REPLAY_MODE_RECORD:
|
|
fmode = "wb";
|
|
break;
|
|
case REPLAY_MODE_PLAY:
|
|
fmode = "rb";
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Replay: internal error: invalid replay mode\n");
|
|
exit(1);
|
|
}
|
|
|
|
atexit(replay_finish);
|
|
|
|
replay_file = fopen(fname, fmode);
|
|
if (replay_file == NULL) {
|
|
fprintf(stderr, "Replay: open %s: %s\n", fname, strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
replay_filename = g_strdup(fname);
|
|
replay_mode = mode;
|
|
replay_mutex_init();
|
|
|
|
replay_state.data_kind = -1;
|
|
replay_state.instruction_count = 0;
|
|
replay_state.current_icount = 0;
|
|
replay_state.current_event = 0;
|
|
replay_state.has_unread_data = 0;
|
|
|
|
/* skip file header for RECORD and check it for PLAY */
|
|
if (replay_mode == REPLAY_MODE_RECORD) {
|
|
fseek(replay_file, HEADER_SIZE, SEEK_SET);
|
|
} else if (replay_mode == REPLAY_MODE_PLAY) {
|
|
unsigned int version = replay_get_dword();
|
|
if (version != REPLAY_VERSION) {
|
|
fprintf(stderr, "Replay: invalid input log file version\n");
|
|
exit(1);
|
|
}
|
|
/* go to the beginning */
|
|
fseek(replay_file, HEADER_SIZE, SEEK_SET);
|
|
replay_fetch_data_kind();
|
|
}
|
|
|
|
runstate_replay_enable();
|
|
|
|
replay_init_events();
|
|
}
|
|
|
|
void replay_configure(QemuOpts *opts)
|
|
{
|
|
const char *fname;
|
|
const char *rr;
|
|
ReplayMode mode = REPLAY_MODE_NONE;
|
|
Location loc;
|
|
|
|
if (!opts) {
|
|
return;
|
|
}
|
|
|
|
loc_push_none(&loc);
|
|
qemu_opts_loc_restore(opts);
|
|
|
|
rr = qemu_opt_get(opts, "rr");
|
|
if (!rr) {
|
|
/* Just enabling icount */
|
|
goto out;
|
|
} else if (!strcmp(rr, "record")) {
|
|
mode = REPLAY_MODE_RECORD;
|
|
} else if (!strcmp(rr, "replay")) {
|
|
mode = REPLAY_MODE_PLAY;
|
|
} else {
|
|
error_report("Invalid icount rr option: %s", rr);
|
|
exit(1);
|
|
}
|
|
|
|
fname = qemu_opt_get(opts, "rrfile");
|
|
if (!fname) {
|
|
error_report("File name not specified for replay");
|
|
exit(1);
|
|
}
|
|
|
|
replay_snapshot = g_strdup(qemu_opt_get(opts, "rrsnapshot"));
|
|
replay_vmstate_register();
|
|
replay_enable(fname, mode);
|
|
|
|
out:
|
|
loc_pop(&loc);
|
|
}
|
|
|
|
void replay_start(void)
|
|
{
|
|
if (replay_mode == REPLAY_MODE_NONE) {
|
|
return;
|
|
}
|
|
|
|
if (replay_blockers) {
|
|
error_reportf_err(replay_blockers->data, "Record/replay: ");
|
|
exit(1);
|
|
}
|
|
if (!icount_enabled()) {
|
|
error_report("Please enable icount to use record/replay");
|
|
exit(1);
|
|
}
|
|
|
|
/* Timer for snapshotting will be set up here. */
|
|
|
|
replay_enable_events();
|
|
}
|
|
|
|
void replay_finish(void)
|
|
{
|
|
if (replay_mode == REPLAY_MODE_NONE) {
|
|
return;
|
|
}
|
|
|
|
replay_save_instructions();
|
|
|
|
/* finalize the file */
|
|
if (replay_file) {
|
|
if (replay_mode == REPLAY_MODE_RECORD) {
|
|
/*
|
|
* Can't do it in the signal handler, therefore
|
|
* add shutdown event here for the case of Ctrl-C.
|
|
*/
|
|
replay_shutdown_request(SHUTDOWN_CAUSE_HOST_SIGNAL);
|
|
/* write end event */
|
|
replay_put_event(EVENT_END);
|
|
|
|
/* write header */
|
|
fseek(replay_file, 0, SEEK_SET);
|
|
replay_put_dword(REPLAY_VERSION);
|
|
}
|
|
|
|
fclose(replay_file);
|
|
replay_file = NULL;
|
|
}
|
|
g_free(replay_filename);
|
|
replay_filename = NULL;
|
|
|
|
g_free(replay_snapshot);
|
|
replay_snapshot = NULL;
|
|
|
|
replay_finish_events();
|
|
replay_mode = REPLAY_MODE_NONE;
|
|
}
|
|
|
|
void replay_add_blocker(const char *feature)
|
|
{
|
|
Error *reason = NULL;
|
|
|
|
error_setg(&reason, "Record/replay is not supported with %s",
|
|
feature);
|
|
replay_blockers = g_slist_prepend(replay_blockers, reason);
|
|
}
|
|
|
|
const char *replay_get_filename(void)
|
|
{
|
|
return replay_filename;
|
|
}
|