> From: Paolo Bonzini [mailto:paolo.bonz...@gmail.com] On Behalf Of Paolo > Bonzini > On 23/09/2015 09:22, Pavel Dovgaluk wrote: > > Sometimes tcg thread halts in qemu_tcg_wait_io_event function, > > waiting for any external event. Virtual clock does not run, because > > warp is not called. warp call in main_loop_wait proceeds virtual > > clock and allows tcg thread to run further. > > Ok, this makes sense! > > Would this work too as a replacement for this patch?
No, it doesn't help. It seems that tcg is waiting within qemu_cond_wait function without leaving it. > > diff --git a/cpus.c b/cpus.c > index fbbd17f..9480acc 100644 > --- a/cpus.c > +++ b/cpus.c > @@ -926,6 +926,7 @@ static void qemu_tcg_wait_io_event(CPUState *cpu) > } > > while (iothread_requesting_mutex) { > + qemu_clock_warp(QEMU_CLOCK_VIRTUAL); > qemu_cond_wait(&qemu_io_proceeded_cond, &qemu_global_mutex); > } Pavel Dovgalyuk