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https://gitlab.com/qemu-project/qemu
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qemu: refactor main_loop (Marcelo Tosatti)
Break main loop into 3 main functions. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7241 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori
parent
50317c7fa7
commit
43b9685807
1 changed files with 160 additions and 138 deletions
298
vl.c
298
vl.c
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@ -273,7 +273,7 @@ uint64_t node_cpumask[MAX_NODES];
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static CPUState *cur_cpu;
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static CPUState *next_cpu;
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static int event_pending = 1;
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static int timer_alarm_pending = 1;
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/* Conversion factor from emulated instructions to virtual clock ticks. */
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static int icount_time_shift;
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/* Arbitrarily pick 1MIPS as the minimum allowable speed. */
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@ -1360,7 +1360,7 @@ static void host_alarm_handler(int host_signum)
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}
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#endif
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}
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event_pending = 1;
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timer_alarm_pending = 1;
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qemu_notify_event();
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}
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}
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@ -3879,153 +3879,175 @@ void main_loop_wait(int timeout)
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}
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static int main_loop(void)
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static int qemu_cpu_exec(CPUState *env)
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{
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int ret, timeout;
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int ret;
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#ifdef CONFIG_PROFILER
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int64_t ti;
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#endif
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#ifdef CONFIG_PROFILER
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ti = profile_getclock();
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#endif
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if (use_icount) {
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int64_t count;
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int decr;
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qemu_icount -= (env->icount_decr.u16.low + env->icount_extra);
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env->icount_decr.u16.low = 0;
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env->icount_extra = 0;
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count = qemu_next_deadline();
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count = (count + (1 << icount_time_shift) - 1)
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>> icount_time_shift;
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qemu_icount += count;
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decr = (count > 0xffff) ? 0xffff : count;
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count -= decr;
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env->icount_decr.u16.low = decr;
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env->icount_extra = count;
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}
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ret = cpu_exec(env);
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#ifdef CONFIG_PROFILER
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qemu_time += profile_getclock() - ti;
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#endif
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if (use_icount) {
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/* Fold pending instructions back into the
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instruction counter, and clear the interrupt flag. */
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qemu_icount -= (env->icount_decr.u16.low
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+ env->icount_extra);
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env->icount_decr.u32 = 0;
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env->icount_extra = 0;
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}
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return ret;
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}
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static int cpu_has_work(CPUState *env)
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{
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if (!env->halted)
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return 1;
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if (qemu_cpu_has_work(env))
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return 1;
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return 0;
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}
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static int tcg_has_work(void)
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{
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CPUState *env;
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cur_cpu = first_cpu;
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next_cpu = cur_cpu->next_cpu ?: first_cpu;
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for(;;) {
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if (vm_running) {
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for (env = first_cpu; env != NULL; env = env->next_cpu)
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if (cpu_has_work(env))
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return 1;
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return 0;
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}
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for(;;) {
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/* get next cpu */
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env = next_cpu;
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#ifdef CONFIG_PROFILER
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ti = profile_getclock();
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#endif
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if (use_icount) {
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int64_t count;
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int decr;
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qemu_icount -= (env->icount_decr.u16.low + env->icount_extra);
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env->icount_decr.u16.low = 0;
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env->icount_extra = 0;
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count = qemu_next_deadline();
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count = (count + (1 << icount_time_shift) - 1)
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>> icount_time_shift;
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qemu_icount += count;
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decr = (count > 0xffff) ? 0xffff : count;
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count -= decr;
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env->icount_decr.u16.low = decr;
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env->icount_extra = count;
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}
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ret = cpu_exec(env);
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#ifdef CONFIG_PROFILER
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qemu_time += profile_getclock() - ti;
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#endif
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if (use_icount) {
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/* Fold pending instructions back into the
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instruction counter, and clear the interrupt flag. */
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qemu_icount -= (env->icount_decr.u16.low
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+ env->icount_extra);
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env->icount_decr.u32 = 0;
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env->icount_extra = 0;
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}
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next_cpu = env->next_cpu ?: first_cpu;
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if (event_pending && likely(ret != EXCP_DEBUG)) {
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ret = EXCP_INTERRUPT;
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event_pending = 0;
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break;
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}
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if (ret == EXCP_HLT) {
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/* Give the next CPU a chance to run. */
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cur_cpu = env;
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continue;
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}
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if (ret != EXCP_HALTED)
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break;
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/* all CPUs are halted ? */
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if (env == cur_cpu)
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break;
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}
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cur_cpu = env;
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static int qemu_calculate_timeout(void)
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{
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int timeout;
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if (shutdown_requested) {
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ret = EXCP_INTERRUPT;
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if (no_shutdown) {
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vm_stop(0);
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no_shutdown = 0;
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}
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else
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break;
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}
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if (reset_requested) {
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reset_requested = 0;
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qemu_system_reset();
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ret = EXCP_INTERRUPT;
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}
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if (powerdown_requested) {
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powerdown_requested = 0;
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qemu_system_powerdown();
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ret = EXCP_INTERRUPT;
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}
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if (unlikely(ret == EXCP_DEBUG)) {
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gdb_set_stop_cpu(cur_cpu);
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vm_stop(EXCP_DEBUG);
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}
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/* If all cpus are halted then wait until the next IRQ */
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/* XXX: use timeout computed from timers */
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if (ret == EXCP_HALTED) {
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if (use_icount) {
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int64_t add;
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int64_t delta;
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/* Advance virtual time to the next event. */
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if (use_icount == 1) {
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/* When not using an adaptive execution frequency
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we tend to get badly out of sync with real time,
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so just delay for a reasonable amount of time. */
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delta = 0;
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} else {
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delta = cpu_get_icount() - cpu_get_clock();
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}
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if (delta > 0) {
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/* If virtual time is ahead of real time then just
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wait for IO. */
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timeout = (delta / 1000000) + 1;
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} else {
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/* Wait for either IO to occur or the next
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timer event. */
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add = qemu_next_deadline();
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/* We advance the timer before checking for IO.
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Limit the amount we advance so that early IO
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activity won't get the guest too far ahead. */
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if (add > 10000000)
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add = 10000000;
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delta += add;
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add = (add + (1 << icount_time_shift) - 1)
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>> icount_time_shift;
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qemu_icount += add;
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timeout = delta / 1000000;
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if (timeout < 0)
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timeout = 0;
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}
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} else {
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timeout = 5000;
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}
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} else {
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timeout = 0;
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}
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if (!vm_running)
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timeout = 5000;
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else if (tcg_has_work())
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timeout = 0;
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else if (!use_icount)
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timeout = 5000;
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else {
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/* XXX: use timeout computed from timers */
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int64_t add;
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int64_t delta;
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/* Advance virtual time to the next event. */
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if (use_icount == 1) {
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/* When not using an adaptive execution frequency
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we tend to get badly out of sync with real time,
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so just delay for a reasonable amount of time. */
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delta = 0;
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} else {
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if (shutdown_requested) {
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ret = EXCP_INTERRUPT;
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break;
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}
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timeout = 5000;
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delta = cpu_get_icount() - cpu_get_clock();
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}
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if (delta > 0) {
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/* If virtual time is ahead of real time then just
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wait for IO. */
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timeout = (delta / 1000000) + 1;
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} else {
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/* Wait for either IO to occur or the next
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timer event. */
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add = qemu_next_deadline();
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/* We advance the timer before checking for IO.
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Limit the amount we advance so that early IO
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activity won't get the guest too far ahead. */
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if (add > 10000000)
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add = 10000000;
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delta += add;
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add = (add + (1 << icount_time_shift) - 1)
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>> icount_time_shift;
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qemu_icount += add;
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timeout = delta / 1000000;
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if (timeout < 0)
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timeout = 0;
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}
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#ifdef CONFIG_PROFILER
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ti = profile_getclock();
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#endif
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main_loop_wait(timeout);
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#ifdef CONFIG_PROFILER
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dev_time += profile_getclock() - ti;
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#endif
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}
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cpu_disable_ticks();
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return ret;
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return timeout;
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}
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static int vm_can_run(void)
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{
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if (powerdown_requested)
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return 0;
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if (reset_requested)
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return 0;
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if (shutdown_requested)
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return 0;
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return 1;
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}
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static void main_loop(void)
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{
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int ret = 0;
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#ifdef CONFIG_PROFILER
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int64_t ti;
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#endif
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for (;;) {
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do {
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if (next_cpu == NULL)
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next_cpu = first_cpu;
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for (; next_cpu != NULL; next_cpu = next_cpu->next_cpu) {
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CPUState *env = cur_cpu = next_cpu;
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if (!vm_running)
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break;
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if (timer_alarm_pending) {
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timer_alarm_pending = 0;
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break;
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}
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ret = qemu_cpu_exec(env);
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if (ret == EXCP_DEBUG) {
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gdb_set_stop_cpu(env);
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break;
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}
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}
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#ifdef CONFIG_PROFILER
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ti = profile_getclock();
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#endif
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main_loop_wait(qemu_calculate_timeout());
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#ifdef CONFIG_PROFILER
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dev_time += profile_getclock() - ti;
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#endif
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} while (ret != EXCP_DEBUG && vm_can_run());
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if (ret == EXCP_DEBUG)
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vm_stop(EXCP_DEBUG);
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if (qemu_shutdown_requested()) {
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if (no_shutdown) {
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vm_stop(0);
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no_shutdown = 0;
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} else
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break;
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}
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if (qemu_reset_requested())
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qemu_system_reset();
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if (qemu_powerdown_requested())
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qemu_system_powerdown();
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}
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}
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static void version(void)
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