diff options
| -rw-r--r-- | include/qemu/timer.h | 10 | ||||
| -rw-r--r-- | slirp/ip6_icmp.c | 4 | ||||
| -rw-r--r-- | ui/input.c | 5 | ||||
| -rw-r--r-- | util/qemu-timer.c | 50 |
4 files changed, 58 insertions, 11 deletions
diff --git a/include/qemu/timer.h b/include/qemu/timer.h index 8ff1092..9f37c92 100644 --- a/include/qemu/timer.h +++ b/include/qemu/timer.h @@ -60,9 +60,17 @@ typedef enum { * Each attribute corresponds to one bit. Attributes modify the processing * of timers when they fire. * - * No attributes defined currently. + * The following attributes are available: + * + * QEMU_TIMER_ATTR_EXTERNAL: drives external subsystem + * + * Timers with this attribute do not recorded in rr mode, therefore it could be + * used for the subsystems that operate outside the guest core. Applicable only + * with virtual clock type. */ +#define QEMU_TIMER_ATTR_EXTERNAL BIT(0) + typedef struct QEMUTimerList QEMUTimerList; struct QEMUTimerListGroup { diff --git a/slirp/ip6_icmp.c b/slirp/ip6_icmp.c index ee333d0..cd1e0b9 100644 --- a/slirp/ip6_icmp.c +++ b/slirp/ip6_icmp.c @@ -27,7 +27,9 @@ void icmp6_init(Slirp *slirp) return; } - slirp->ra_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, ra_timer_handler, slirp); + slirp->ra_timer = timer_new_full(NULL, QEMU_CLOCK_VIRTUAL, + SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL, + ra_timer_handler, slirp); timer_mod(slirp->ra_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + NDP_Interval); } @@ -448,8 +448,9 @@ void qemu_input_event_send_key_delay(uint32_t delay_ms) } if (!kbd_timer) { - kbd_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, qemu_input_queue_process, - &kbd_queue); + kbd_timer = timer_new_full(NULL, QEMU_CLOCK_VIRTUAL, + SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL, + qemu_input_queue_process, &kbd_queue); } if (queue_count < queue_limit) { qemu_input_queue_delay(&kbd_queue, kbd_timer, diff --git a/util/qemu-timer.c b/util/qemu-timer.c index 04527a3..1cc1b2f 100644 --- a/util/qemu-timer.c +++ b/util/qemu-timer.c @@ -489,6 +489,7 @@ bool timerlist_run_timers(QEMUTimerList *timer_list) bool progress = false; QEMUTimerCB *cb; void *opaque; + bool need_replay_checkpoint = false; if (!atomic_read(&timer_list->active_timers)) { return false; @@ -504,8 +505,15 @@ bool timerlist_run_timers(QEMUTimerList *timer_list) break; default: case QEMU_CLOCK_VIRTUAL: - if (!replay_checkpoint(CHECKPOINT_CLOCK_VIRTUAL)) { - goto out; + if (replay_mode != REPLAY_MODE_NONE) { + /* Checkpoint for virtual clock is redundant in cases where + * it's being triggered with only non-EXTERNAL timers, because + * these timers don't change guest state directly. + * Since it has conditional dependence on specific timers, it is + * subject to race conditions and requires special handling. + * See below. + */ + need_replay_checkpoint = true; } break; case QEMU_CLOCK_HOST: @@ -520,14 +528,39 @@ bool timerlist_run_timers(QEMUTimerList *timer_list) break; } + /* + * Extract expired timers from active timers list and and process them. + * + * In rr mode we need "filtered" checkpointing for virtual clock. The + * checkpoint must be recorded/replayed before processing any non-EXTERNAL timer, + * and that must only be done once since the clock value stays the same. Because + * non-EXTERNAL timers may appear in the timers list while it being processed, + * the checkpoint can be issued at a time until no timers are left and we are + * done". + */ current_time = qemu_clock_get_ns(timer_list->clock->type); - for(;;) { - qemu_mutex_lock(&timer_list->active_timers_lock); - ts = timer_list->active_timers; + qemu_mutex_lock(&timer_list->active_timers_lock); + while ((ts = timer_list->active_timers)) { if (!timer_expired_ns(ts, current_time)) { - qemu_mutex_unlock(&timer_list->active_timers_lock); + /* No expired timers left. The checkpoint can be skipped + * if no timers fired or they were all external. + */ break; } + if (need_replay_checkpoint + && !(ts->attributes & QEMU_TIMER_ATTR_EXTERNAL)) { + /* once we got here, checkpoint clock only once */ + need_replay_checkpoint = false; + qemu_mutex_unlock(&timer_list->active_timers_lock); + if (!replay_checkpoint(CHECKPOINT_CLOCK_VIRTUAL)) { + goto out; + } + qemu_mutex_lock(&timer_list->active_timers_lock); + /* The lock was released; start over again in case the list was + * modified. + */ + continue; + } /* remove timer from the list before calling the callback */ timer_list->active_timers = ts->next; @@ -535,12 +568,15 @@ bool timerlist_run_timers(QEMUTimerList *timer_list) ts->expire_time = -1; cb = ts->cb; opaque = ts->opaque; - qemu_mutex_unlock(&timer_list->active_timers_lock); /* run the callback (the timer list can be modified) */ + qemu_mutex_unlock(&timer_list->active_timers_lock); cb(opaque); + qemu_mutex_lock(&timer_list->active_timers_lock); + progress = true; } + qemu_mutex_unlock(&timer_list->active_timers_lock); out: qemu_event_set(&timer_list->timers_done_ev); |