On Thu, Jun 09, 2022 at 10:37:23AM -0400, Emanuele Giuseppe Esposito wrote:
> All the callbacks below are always running in the main loop.
> 
> The callbacks are the following:
> - start/stop_ioeventfd: these are the callbacks where
>   blk_set_aio_context(iothread) is done, so they are called in the main
>   loop.
> 
> - save and load: called during migration, when VM is stopped from the
>   main loop.
> 
> - reset: before calling this callback, stop_ioeventfd is invoked, so
>   it can only run in the main loop.
> 
> - set_status: going through all the callers we can see it is called
>   from a MemoryRegionOps callback, which always run in the main loop.
> 
> - realize: iothread is not even created yet.
> 
> Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
> ---
>  hw/block/virtio-blk.c  | 2 ++
>  hw/virtio/virtio-bus.c | 5 +++++
>  hw/virtio/virtio-pci.c | 2 ++
>  hw/virtio/virtio.c     | 8 ++++++++
>  4 files changed, 17 insertions(+)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>