qemu/replay/replay-events.c
Pavel Dovgalyuk f9a9fb6516 replay: flush rr queue before loading the vmstate
Non-empty record/replay queue prevents saving and loading the VM state,
because it includes pending bottom halves and block coroutines.
But when the new VM state is loaded, we don't have to preserve the consistency
of the current state anymore. Therefore this patch just flushes the queue
allowing the coroutines to finish and removes checking for empty rr queue
for load_snapshot function.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <160174521762.12451.15752448887893855757.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-06 08:34:49 +02:00

334 lines
8.6 KiB
C

/*
* replay-events.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 "qemu/error-report.h"
#include "sysemu/replay.h"
#include "replay-internal.h"
#include "block/aio.h"
#include "ui/input.h"
typedef struct Event {
ReplayAsyncEventKind event_kind;
void *opaque;
void *opaque2;
uint64_t id;
QTAILQ_ENTRY(Event) events;
} Event;
static QTAILQ_HEAD(, Event) events_list = QTAILQ_HEAD_INITIALIZER(events_list);
static bool events_enabled;
/* Functions */
static void replay_run_event(Event *event)
{
switch (event->event_kind) {
case REPLAY_ASYNC_EVENT_BH:
aio_bh_call(event->opaque);
break;
case REPLAY_ASYNC_EVENT_BH_ONESHOT:
((QEMUBHFunc *)event->opaque)(event->opaque2);
break;
case REPLAY_ASYNC_EVENT_INPUT:
qemu_input_event_send_impl(NULL, (InputEvent *)event->opaque);
qapi_free_InputEvent((InputEvent *)event->opaque);
break;
case REPLAY_ASYNC_EVENT_INPUT_SYNC:
qemu_input_event_sync_impl();
break;
case REPLAY_ASYNC_EVENT_CHAR_READ:
replay_event_char_read_run(event->opaque);
break;
case REPLAY_ASYNC_EVENT_BLOCK:
aio_bh_call(event->opaque);
break;
case REPLAY_ASYNC_EVENT_NET:
replay_event_net_run(event->opaque);
break;
default:
error_report("Replay: invalid async event ID (%d) in the queue",
event->event_kind);
exit(1);
break;
}
}
void replay_enable_events(void)
{
if (replay_mode != REPLAY_MODE_NONE) {
events_enabled = true;
}
}
bool replay_has_events(void)
{
return !QTAILQ_EMPTY(&events_list);
}
void replay_flush_events(void)
{
if (replay_mode == REPLAY_MODE_NONE) {
return;
}
g_assert(replay_mutex_locked());
while (!QTAILQ_EMPTY(&events_list)) {
Event *event = QTAILQ_FIRST(&events_list);
replay_run_event(event);
QTAILQ_REMOVE(&events_list, event, events);
g_free(event);
}
}
void replay_disable_events(void)
{
if (replay_mode != REPLAY_MODE_NONE) {
events_enabled = false;
/* Flush events queue before waiting of completion */
replay_flush_events();
}
}
/*! Adds specified async event to the queue */
void replay_add_event(ReplayAsyncEventKind event_kind,
void *opaque,
void *opaque2, uint64_t id)
{
assert(event_kind < REPLAY_ASYNC_COUNT);
if (!replay_file || replay_mode == REPLAY_MODE_NONE
|| !events_enabled) {
Event e;
e.event_kind = event_kind;
e.opaque = opaque;
e.opaque2 = opaque2;
e.id = id;
replay_run_event(&e);
return;
}
Event *event = g_malloc0(sizeof(Event));
event->event_kind = event_kind;
event->opaque = opaque;
event->opaque2 = opaque2;
event->id = id;
g_assert(replay_mutex_locked());
QTAILQ_INSERT_TAIL(&events_list, event, events);
}
void replay_bh_schedule_event(QEMUBH *bh)
{
if (events_enabled) {
uint64_t id = replay_get_current_icount();
replay_add_event(REPLAY_ASYNC_EVENT_BH, bh, NULL, id);
} else {
qemu_bh_schedule(bh);
}
}
void replay_bh_schedule_oneshot_event(AioContext *ctx,
QEMUBHFunc *cb, void *opaque)
{
if (events_enabled) {
uint64_t id = replay_get_current_icount();
replay_add_event(REPLAY_ASYNC_EVENT_BH_ONESHOT, cb, opaque, id);
} else {
aio_bh_schedule_oneshot(ctx, cb, opaque);
}
}
void replay_add_input_event(struct InputEvent *event)
{
replay_add_event(REPLAY_ASYNC_EVENT_INPUT, event, NULL, 0);
}
void replay_add_input_sync_event(void)
{
replay_add_event(REPLAY_ASYNC_EVENT_INPUT_SYNC, NULL, NULL, 0);
}
void replay_block_event(QEMUBH *bh, uint64_t id)
{
if (events_enabled) {
replay_add_event(REPLAY_ASYNC_EVENT_BLOCK, bh, NULL, id);
} else {
qemu_bh_schedule(bh);
}
}
static void replay_save_event(Event *event, int checkpoint)
{
if (replay_mode != REPLAY_MODE_PLAY) {
/* put the event into the file */
replay_put_event(EVENT_ASYNC);
replay_put_byte(checkpoint);
replay_put_byte(event->event_kind);
/* save event-specific data */
switch (event->event_kind) {
case REPLAY_ASYNC_EVENT_BH:
case REPLAY_ASYNC_EVENT_BH_ONESHOT:
replay_put_qword(event->id);
break;
case REPLAY_ASYNC_EVENT_INPUT:
replay_save_input_event(event->opaque);
break;
case REPLAY_ASYNC_EVENT_INPUT_SYNC:
break;
case REPLAY_ASYNC_EVENT_CHAR_READ:
replay_event_char_read_save(event->opaque);
break;
case REPLAY_ASYNC_EVENT_BLOCK:
replay_put_qword(event->id);
break;
case REPLAY_ASYNC_EVENT_NET:
replay_event_net_save(event->opaque);
break;
default:
error_report("Unknown ID %" PRId64 " of replay event", event->id);
exit(1);
}
}
}
/* Called with replay mutex locked */
void replay_save_events(int checkpoint)
{
g_assert(replay_mutex_locked());
g_assert(checkpoint != CHECKPOINT_CLOCK_WARP_START);
g_assert(checkpoint != CHECKPOINT_CLOCK_VIRTUAL);
while (!QTAILQ_EMPTY(&events_list)) {
Event *event = QTAILQ_FIRST(&events_list);
replay_save_event(event, checkpoint);
replay_run_event(event);
QTAILQ_REMOVE(&events_list, event, events);
g_free(event);
}
}
static Event *replay_read_event(int checkpoint)
{
Event *event;
if (replay_state.read_event_kind == -1) {
replay_state.read_event_checkpoint = replay_get_byte();
replay_state.read_event_kind = replay_get_byte();
replay_state.read_event_id = -1;
replay_check_error();
}
if (checkpoint != replay_state.read_event_checkpoint) {
return NULL;
}
/* Events that has not to be in the queue */
switch (replay_state.read_event_kind) {
case REPLAY_ASYNC_EVENT_BH:
case REPLAY_ASYNC_EVENT_BH_ONESHOT:
if (replay_state.read_event_id == -1) {
replay_state.read_event_id = replay_get_qword();
}
break;
case REPLAY_ASYNC_EVENT_INPUT:
event = g_malloc0(sizeof(Event));
event->event_kind = replay_state.read_event_kind;
event->opaque = replay_read_input_event();
return event;
case REPLAY_ASYNC_EVENT_INPUT_SYNC:
event = g_malloc0(sizeof(Event));
event->event_kind = replay_state.read_event_kind;
event->opaque = 0;
return event;
case REPLAY_ASYNC_EVENT_CHAR_READ:
event = g_malloc0(sizeof(Event));
event->event_kind = replay_state.read_event_kind;
event->opaque = replay_event_char_read_load();
return event;
case REPLAY_ASYNC_EVENT_BLOCK:
if (replay_state.read_event_id == -1) {
replay_state.read_event_id = replay_get_qword();
}
break;
case REPLAY_ASYNC_EVENT_NET:
event = g_malloc0(sizeof(Event));
event->event_kind = replay_state.read_event_kind;
event->opaque = replay_event_net_load();
return event;
default:
error_report("Unknown ID %d of replay event",
replay_state.read_event_kind);
exit(1);
break;
}
QTAILQ_FOREACH(event, &events_list, events) {
if (event->event_kind == replay_state.read_event_kind
&& (replay_state.read_event_id == -1
|| replay_state.read_event_id == event->id)) {
break;
}
}
if (event) {
QTAILQ_REMOVE(&events_list, event, events);
} else {
return NULL;
}
/* Read event-specific data */
return event;
}
/* Called with replay mutex locked */
void replay_read_events(int checkpoint)
{
g_assert(replay_mutex_locked());
while (replay_state.data_kind == EVENT_ASYNC) {
Event *event = replay_read_event(checkpoint);
if (!event) {
break;
}
replay_finish_event();
replay_state.read_event_kind = -1;
replay_run_event(event);
g_free(event);
}
}
void replay_init_events(void)
{
replay_state.read_event_kind = -1;
}
void replay_finish_events(void)
{
events_enabled = false;
replay_flush_events();
}
bool replay_events_enabled(void)
{
return events_enabled;
}
uint64_t blkreplay_next_id(void)
{
if (replay_events_enabled()) {
return replay_state.block_request_id++;
}
return 0;
}