From: Nicholas Piggin <npig...@gmail.com>
This reverts commit 1f881ea4a444ef36a8b6907b0b82be4b3af253a2.
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.ben...@linaro.org>
Signed-off-by: Nicholas Piggin <npig...@gmail.com>
Message-Id: <20240813050638.446172-6-npig...@gmail.com>
Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
---
include/sysemu/replay.h | 5 -----
accel/tcg/tcg-accel-ops-rr.c | 2 +-
replay/replay.c | 21 ---------------------
3 files changed, 1 insertion(+), 27 deletions(-)
diff --git a/include/sysemu/replay.h b/include/sysemu/replay.h
index f229b2109c..8102fa54f0 100644
--- a/include/sysemu/replay.h
+++ b/include/sysemu/replay.h
@@ -73,11 +73,6 @@ int replay_get_instructions(void);
/*! Updates instructions counter in replay mode. */
void replay_account_executed_instructions(void);
-/**
- * replay_can_wait: check if we should pause for wait-io
- */
-bool replay_can_wait(void);
-
/* Processing clocks and other time sources */
/*! Save the specified clock */
diff --git a/accel/tcg/tcg-accel-ops-rr.c b/accel/tcg/tcg-accel-ops-rr.c
index 48c38714bd..c59c77da4b 100644
--- a/accel/tcg/tcg-accel-ops-rr.c
+++ b/accel/tcg/tcg-accel-ops-rr.c
@@ -109,7 +109,7 @@ static void rr_wait_io_event(void)
{
CPUState *cpu;
- while (all_cpu_threads_idle() && replay_can_wait()) {
+ while (all_cpu_threads_idle()) {
rr_stop_kick_timer();
qemu_cond_wait_bql(first_cpu->halt_cond);
}
diff --git a/replay/replay.c b/replay/replay.c
index b8564a4813..895fa6b67a 100644
--- a/replay/replay.c
+++ b/replay/replay.c
@@ -451,27 +451,6 @@ void replay_start(void)
replay_enable_events();
}
-/*
- * For none/record the answer is yes.
- */
-bool replay_can_wait(void)
-{
- if (replay_mode == REPLAY_MODE_PLAY) {
- /*
- * For playback we shouldn't ever be at a point we wait. If
- * the instruction count has reached zero and we have an
- * unconsumed event we should go around again and consume it.
- */
- if (replay_state.instruction_count == 0 &&
replay_state.has_unread_data) {
- return false;
- } else {
- replay_sync_error("Playback shouldn't have to iowait");
- }
- }
- return true;
-}
-
-
void replay_finish(void)
{
if (replay_mode == REPLAY_MODE_NONE) {
--
2.39.2
