Re: [Qemu-devel] [PATCH] replay: wake up vCPU when replaying

["Pavel Dovgalyuk" <dovgaluk@ispras.ru>]

> From: Paolo Bonzini [mailto:pbonzini@redhat.com]
> On 09/07/2018 13:24, Pavel Dovgalyuk wrote:
> > static void qemu_tcg_rr_wait_io_event(CPUState *cpu)
> > {
> >     while (all_cpu_threads_idle()) {
> >         stop_tcg_kick_timer();
> >         qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex);
> >     }
> >
> >     start_tcg_kick_timer();
> >
> >     qemu_wait_io_event_common(cpu);
> > }
> >
> > all_cpu_threads_idle() returns true when there is no queued work.
> > But between this call and qemu_cond_wait() iothread may add queued work
> > and the vCPU thread will sleep infinitely.
> 
> Maybe queue_work_on_cpu is called outside BQL?

I don't remember now.
However, rr series includes the better version of that patch.

Pavel Dovgalyuk