diff options
Diffstat (limited to 'cpus.c')
| -rw-r--r-- | cpus.c | 200 |
1 files changed, 99 insertions, 101 deletions
@@ -1055,7 +1055,105 @@ static void *qemu_dummy_cpu_thread_fn(void *arg) #endif } -static void tcg_exec_all(void); +static int64_t tcg_get_icount_limit(void) +{ + int64_t deadline; + + if (replay_mode != REPLAY_MODE_PLAY) { + deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL); + + /* Maintain prior (possibly buggy) behaviour where if no deadline + * was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than + * INT32_MAX nanoseconds ahead, we still use INT32_MAX + * nanoseconds. + */ + if ((deadline < 0) || (deadline > INT32_MAX)) { + deadline = INT32_MAX; + } + + return qemu_icount_round(deadline); + } else { + return replay_get_instructions(); + } +} + +static int tcg_cpu_exec(CPUState *cpu) +{ + int ret; +#ifdef CONFIG_PROFILER + int64_t ti; +#endif + +#ifdef CONFIG_PROFILER + ti = profile_getclock(); +#endif + if (use_icount) { + int64_t count; + int decr; + timers_state.qemu_icount -= (cpu->icount_decr.u16.low + + cpu->icount_extra); + cpu->icount_decr.u16.low = 0; + cpu->icount_extra = 0; + count = tcg_get_icount_limit(); + timers_state.qemu_icount += count; + decr = (count > 0xffff) ? 0xffff : count; + count -= decr; + cpu->icount_decr.u16.low = decr; + cpu->icount_extra = count; + } + cpu_exec_start(cpu); + ret = cpu_exec(cpu); + cpu_exec_end(cpu); +#ifdef CONFIG_PROFILER + tcg_time += profile_getclock() - ti; +#endif + if (use_icount) { + /* Fold pending instructions back into the + instruction counter, and clear the interrupt flag. */ + timers_state.qemu_icount -= (cpu->icount_decr.u16.low + + cpu->icount_extra); + cpu->icount_decr.u32 = 0; + cpu->icount_extra = 0; + replay_account_executed_instructions(); + } + return ret; +} + +static void tcg_exec_all(void) +{ + int r; + + /* Account partial waits to QEMU_CLOCK_VIRTUAL. */ + qemu_account_warp_timer(); + + if (next_cpu == NULL) { + next_cpu = first_cpu; + } + for (; next_cpu != NULL && !exit_request; next_cpu = CPU_NEXT(next_cpu)) { + CPUState *cpu = next_cpu; + + qemu_clock_enable(QEMU_CLOCK_VIRTUAL, + (cpu->singlestep_enabled & SSTEP_NOTIMER) == 0); + + if (cpu_can_run(cpu)) { + r = tcg_cpu_exec(cpu); + if (r == EXCP_DEBUG) { + cpu_handle_guest_debug(cpu); + break; + } else if (r == EXCP_ATOMIC) { + cpu_exec_step_atomic(cpu); + } + } else if (cpu->stop || cpu->stopped) { + if (cpu->unplug) { + next_cpu = CPU_NEXT(cpu); + } + break; + } + } + + /* Pairs with smp_wmb in qemu_cpu_kick. */ + atomic_mb_set(&exit_request, 0); +} static void *qemu_tcg_cpu_thread_fn(void *arg) { @@ -1412,106 +1510,6 @@ int vm_stop_force_state(RunState state) } } -static int64_t tcg_get_icount_limit(void) -{ - int64_t deadline; - - if (replay_mode != REPLAY_MODE_PLAY) { - deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL); - - /* Maintain prior (possibly buggy) behaviour where if no deadline - * was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than - * INT32_MAX nanoseconds ahead, we still use INT32_MAX - * nanoseconds. - */ - if ((deadline < 0) || (deadline > INT32_MAX)) { - deadline = INT32_MAX; - } - - return qemu_icount_round(deadline); - } else { - return replay_get_instructions(); - } -} - -static int tcg_cpu_exec(CPUState *cpu) -{ - int ret; -#ifdef CONFIG_PROFILER - int64_t ti; -#endif - -#ifdef CONFIG_PROFILER - ti = profile_getclock(); -#endif - if (use_icount) { - int64_t count; - int decr; - timers_state.qemu_icount -= (cpu->icount_decr.u16.low - + cpu->icount_extra); - cpu->icount_decr.u16.low = 0; - cpu->icount_extra = 0; - count = tcg_get_icount_limit(); - timers_state.qemu_icount += count; - decr = (count > 0xffff) ? 0xffff : count; - count -= decr; - cpu->icount_decr.u16.low = decr; - cpu->icount_extra = count; - } - cpu_exec_start(cpu); - ret = cpu_exec(cpu); - cpu_exec_end(cpu); -#ifdef CONFIG_PROFILER - tcg_time += profile_getclock() - ti; -#endif - if (use_icount) { - /* Fold pending instructions back into the - instruction counter, and clear the interrupt flag. */ - timers_state.qemu_icount -= (cpu->icount_decr.u16.low - + cpu->icount_extra); - cpu->icount_decr.u32 = 0; - cpu->icount_extra = 0; - replay_account_executed_instructions(); - } - return ret; -} - -static void tcg_exec_all(void) -{ - int r; - - /* Account partial waits to QEMU_CLOCK_VIRTUAL. */ - qemu_account_warp_timer(); - - if (next_cpu == NULL) { - next_cpu = first_cpu; - } - for (; next_cpu != NULL && !exit_request; next_cpu = CPU_NEXT(next_cpu)) { - CPUState *cpu = next_cpu; - - qemu_clock_enable(QEMU_CLOCK_VIRTUAL, - (cpu->singlestep_enabled & SSTEP_NOTIMER) == 0); - - if (cpu_can_run(cpu)) { - r = tcg_cpu_exec(cpu); - if (r == EXCP_DEBUG) { - cpu_handle_guest_debug(cpu); - break; - } else if (r == EXCP_ATOMIC) { - cpu_exec_step_atomic(cpu); - } - } else if (cpu->stop || cpu->stopped) { - if (cpu->unplug) { - next_cpu = CPU_NEXT(cpu); - } - break; - } - } - - /* Pairs with smp_wmb in qemu_cpu_kick. */ - atomic_mb_set(&exit_request, 0); -} - void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg) { /* XXX: implement xxx_cpu_list for targets that still miss it */ |