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replay: introduce a central report point for sync errors
Figuring out why replay has failed is tricky at the best of times. Lets centralise the reporting of a replay sync error and add a little bit of extra information to help with debugging. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20231211091346.14616-10-alex.bennee@linaro.org>
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@ -175,6 +175,7 @@ void replay_fetch_data_kind(void)
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if (replay_file) {
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if (!replay_state.has_unread_data) {
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replay_state.data_kind = replay_get_byte();
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replay_state.current_event++;
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if (replay_state.data_kind == EVENT_INSTRUCTION) {
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replay_state.instruction_count = replay_get_dword();
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}
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@ -25,7 +25,12 @@ typedef enum ReplayAsyncEventKind {
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REPLAY_ASYNC_COUNT
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} ReplayAsyncEventKind;
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/* Any changes to order/number of events will need to bump REPLAY_VERSION */
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/*
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* Any changes to order/number of events will need to bump
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* REPLAY_VERSION to prevent confusion with old logs. Also don't
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* forget to update replay_event_name() to make your debugging life
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* easier.
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*/
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enum ReplayEvents {
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/* for instruction event */
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EVENT_INSTRUCTION,
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@ -74,6 +79,7 @@ enum ReplayEvents {
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* @cached_clock: Cached clocks values
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* @current_icount: number of processed instructions
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* @instruction_count: number of instructions until next event
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* @current_event: current event index
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* @data_kind: current event
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* @has_unread_data: true if event not yet processed
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* @file_offset: offset into replay log at replay snapshot
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@ -84,6 +90,7 @@ typedef struct ReplayState {
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int64_t cached_clock[REPLAY_CLOCK_COUNT];
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uint64_t current_icount;
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int instruction_count;
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unsigned int current_event;
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unsigned int data_kind;
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bool has_unread_data;
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uint64_t file_offset;
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@ -188,6 +195,16 @@ void replay_event_net_save(void *opaque);
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/*! Reads network from the file. */
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void *replay_event_net_load(void);
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/* Diagnostics */
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/**
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* replay_sync_error(): report sync error and exit
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*
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* When we reach an error condition we want to report it centrally so
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* we can also dump some useful information into the logs.
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*/
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G_NORETURN void replay_sync_error(const char *error);
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/* VMState-related functions */
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/* Registers replay VMState.
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@ -55,6 +55,7 @@ static const VMStateDescription vmstate_replay = {
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VMSTATE_INT64_ARRAY(cached_clock, ReplayState, REPLAY_CLOCK_COUNT),
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VMSTATE_UINT64(current_icount, ReplayState),
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VMSTATE_INT32(instruction_count, ReplayState),
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VMSTATE_UINT32(current_event, ReplayState),
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VMSTATE_UINT32(data_kind, ReplayState),
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VMSTATE_BOOL(has_unread_data, ReplayState),
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VMSTATE_UINT64(file_offset, ReplayState),
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111
replay/replay.c
111
replay/replay.c
@ -38,6 +38,107 @@ static GSList *replay_blockers;
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uint64_t replay_break_icount = -1ULL;
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QEMUTimer *replay_break_timer;
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/* Pretty print event names */
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static const char *replay_async_event_name(ReplayAsyncEventKind event)
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{
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switch (event) {
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#define ASYNC_EVENT(_x) case REPLAY_ASYNC_EVENT_ ## _x: return "ASYNC_EVENT_"#_x
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ASYNC_EVENT(BH);
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ASYNC_EVENT(BH_ONESHOT);
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ASYNC_EVENT(INPUT);
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ASYNC_EVENT(INPUT_SYNC);
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ASYNC_EVENT(CHAR_READ);
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ASYNC_EVENT(BLOCK);
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ASYNC_EVENT(NET);
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#undef ASYNC_EVENT
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default:
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g_assert_not_reached();
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}
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}
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static const char *replay_clock_event_name(ReplayClockKind clock)
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{
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switch (clock) {
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#define CLOCK_EVENT(_x) case REPLAY_CLOCK_ ## _x: return "CLOCK_" #_x
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CLOCK_EVENT(HOST);
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CLOCK_EVENT(VIRTUAL_RT);
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#undef CLOCK_EVENT
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default:
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g_assert_not_reached();
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}
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}
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/* Pretty print shutdown event names */
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static const char *replay_shutdown_event_name(ShutdownCause cause)
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{
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switch (cause) {
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#define SHUTDOWN_EVENT(_x) case SHUTDOWN_CAUSE_ ## _x: return "SHUTDOWN_CAUSE_" #_x
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SHUTDOWN_EVENT(NONE);
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SHUTDOWN_EVENT(HOST_ERROR);
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SHUTDOWN_EVENT(HOST_QMP_QUIT);
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SHUTDOWN_EVENT(HOST_QMP_SYSTEM_RESET);
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SHUTDOWN_EVENT(HOST_SIGNAL);
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SHUTDOWN_EVENT(HOST_UI);
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SHUTDOWN_EVENT(GUEST_SHUTDOWN);
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SHUTDOWN_EVENT(GUEST_RESET);
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SHUTDOWN_EVENT(GUEST_PANIC);
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SHUTDOWN_EVENT(SUBSYSTEM_RESET);
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SHUTDOWN_EVENT(SNAPSHOT_LOAD);
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#undef SHUTDOWN_EVENT
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default:
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g_assert_not_reached();
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}
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}
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static const char *replay_checkpoint_event_name(enum ReplayCheckpoint checkpoint)
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{
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switch (checkpoint) {
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#define CHECKPOINT_EVENT(_x) case CHECKPOINT_ ## _x: return "CHECKPOINT_" #_x
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CHECKPOINT_EVENT(CLOCK_WARP_START);
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CHECKPOINT_EVENT(CLOCK_WARP_ACCOUNT);
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CHECKPOINT_EVENT(RESET_REQUESTED);
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CHECKPOINT_EVENT(SUSPEND_REQUESTED);
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CHECKPOINT_EVENT(CLOCK_VIRTUAL);
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CHECKPOINT_EVENT(CLOCK_HOST);
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CHECKPOINT_EVENT(CLOCK_VIRTUAL_RT);
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CHECKPOINT_EVENT(INIT);
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CHECKPOINT_EVENT(RESET);
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#undef CHECKPOINT_EVENT
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default:
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g_assert_not_reached();
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}
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}
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static const char *replay_event_name(enum ReplayEvents event)
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{
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/* First deal with the simple ones */
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switch (event) {
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#define EVENT(_x) case EVENT_ ## _x: return "EVENT_"#_x
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EVENT(INSTRUCTION);
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EVENT(INTERRUPT);
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EVENT(EXCEPTION);
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EVENT(CHAR_WRITE);
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EVENT(CHAR_READ_ALL);
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EVENT(AUDIO_OUT);
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EVENT(AUDIO_IN);
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EVENT(RANDOM);
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#undef EVENT
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default:
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if (event >= EVENT_ASYNC && event <= EVENT_ASYNC_LAST) {
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return replay_async_event_name(event - EVENT_ASYNC);
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} else if (event >= EVENT_SHUTDOWN && event <= EVENT_SHUTDOWN_LAST) {
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return replay_shutdown_event_name(event - EVENT_SHUTDOWN);
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} else if (event >= EVENT_CLOCK && event <= EVENT_CLOCK_LAST) {
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return replay_clock_event_name(event - EVENT_CLOCK);
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} else if (event >= EVENT_CHECKPOINT && event <= EVENT_CHECKPOINT_LAST) {
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return replay_checkpoint_event_name(event - EVENT_CHECKPOINT);
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}
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}
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g_assert_not_reached();
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}
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bool replay_next_event_is(int event)
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{
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bool res = false;
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@ -226,6 +327,15 @@ bool replay_has_event(void)
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return res;
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}
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G_NORETURN void replay_sync_error(const char *error)
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{
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error_report("%s (insn total %"PRId64"/%d left, event %d is %s)", error,
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replay_state.current_icount, replay_state.instruction_count,
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replay_state.current_event,
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replay_event_name(replay_state.data_kind));
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abort();
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}
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static void replay_enable(const char *fname, int mode)
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{
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const char *fmode = NULL;
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@ -258,6 +368,7 @@ static void replay_enable(const char *fname, int mode)
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replay_state.data_kind = -1;
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replay_state.instruction_count = 0;
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replay_state.current_icount = 0;
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replay_state.current_event = 0;
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replay_state.has_unread_data = 0;
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/* skip file header for RECORD and check it for PLAY */
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