From 366a85e4bb748794b1ae0ca0ccc2d95f316679a0 Mon Sep 17 00:00:00 2001 From: Pavel Dovgalyuk Date: Tue, 16 Feb 2021 15:51:44 +0300 Subject: replay: fix icount request when replaying clock access Record/replay provides REPLAY_CLOCK_LOCKED macro to access the clock when vm_clock_seqlock is locked. This macro is needed because replay internals operate icount. In locked case replay use icount_get_raw_locked for icount request, which prevents excess locking which leads to deadlock. But previously only record code used *_locked function and replay did not. Therefore sometimes clock access lead to deadlocks. This patch fixes clock access for replay too and uses *_locked icount access function. Signed-off-by: Pavel Dovgalyuk Message-Id: <161347990483.1313189.8371838968343494161.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini --- replay/replay-internal.c | 29 +++++++++++++++++++++++++---- replay/replay-time.c | 4 ++-- replay/replay.c | 23 +---------------------- 3 files changed, 28 insertions(+), 28 deletions(-) (limited to 'replay') diff --git a/replay/replay-internal.c b/replay/replay-internal.c index 2e8a3e947a..77d0c82327 100644 --- a/replay/replay-internal.c +++ b/replay/replay-internal.c @@ -247,10 +247,31 @@ void replay_advance_current_icount(uint64_t current_icount) /* Time can only go forward */ assert(diff >= 0); - if (diff > 0) { - replay_put_event(EVENT_INSTRUCTION); - replay_put_dword(diff); - replay_state.current_icount += diff; + if (replay_mode == REPLAY_MODE_RECORD) { + if (diff > 0) { + replay_put_event(EVENT_INSTRUCTION); + replay_put_dword(diff); + replay_state.current_icount += diff; + } + } else if (replay_mode == REPLAY_MODE_PLAY) { + if (diff > 0) { + replay_state.instruction_count -= diff; + replay_state.current_icount += diff; + if (replay_state.instruction_count == 0) { + assert(replay_state.data_kind == EVENT_INSTRUCTION); + replay_finish_event(); + /* Wake up iothread. This is required because + timers will not expire until clock counters + will be read from the log. */ + qemu_notify_event(); + } + } + /* Execution reached the break step */ + if (replay_break_icount == replay_state.current_icount) { + /* Cannot make callback directly from the vCPU thread */ + timer_mod_ns(replay_break_timer, + qemu_clock_get_ns(QEMU_CLOCK_REALTIME)); + } } } diff --git a/replay/replay-time.c b/replay/replay-time.c index 43357c9f24..00ebcb7a49 100644 --- a/replay/replay-time.c +++ b/replay/replay-time.c @@ -46,12 +46,12 @@ void replay_read_next_clock(ReplayClockKind kind) } /*! Reads next clock event from the input. */ -int64_t replay_read_clock(ReplayClockKind kind) +int64_t replay_read_clock(ReplayClockKind kind, int64_t raw_icount) { int64_t ret; g_assert(replay_file && replay_mutex_locked()); - replay_account_executed_instructions(); + replay_advance_current_icount(raw_icount); if (replay_next_event_is(EVENT_CLOCK + kind)) { replay_read_next_clock(kind); diff --git a/replay/replay.c b/replay/replay.c index d4c228ab28..c806fec69a 100644 --- a/replay/replay.c +++ b/replay/replay.c @@ -94,28 +94,7 @@ void replay_account_executed_instructions(void) if (replay_mode == REPLAY_MODE_PLAY) { g_assert(replay_mutex_locked()); if (replay_state.instruction_count > 0) { - int count = (int)(replay_get_current_icount() - - replay_state.current_icount); - - /* Time can only go forward */ - assert(count >= 0); - - replay_state.instruction_count -= count; - replay_state.current_icount += count; - if (replay_state.instruction_count == 0) { - assert(replay_state.data_kind == EVENT_INSTRUCTION); - replay_finish_event(); - /* Wake up iothread. This is required because - timers will not expire until clock counters - will be read from the log. */ - qemu_notify_event(); - } - /* Execution reached the break step */ - if (replay_break_icount == replay_state.current_icount) { - /* Cannot make callback directly from the vCPU thread */ - timer_mod_ns(replay_break_timer, - qemu_clock_get_ns(QEMU_CLOCK_REALTIME)); - } + replay_advance_current_icount(replay_get_current_icount()); } } } -- cgit v1.2.3-55-g7522