Re: [RFC PATCH 3/4] include/sysemu/block-backend: split header into I/O and graph API

[Paolo Bonzini]

On 13/09/21 15:27, Stefan Hajnoczi wrote:
> > +/*
> > + * I/O API functions. These functions are thread-safe, and therefore
> > + * can run in any AioContext.
> "can run in any AioContext" makes me wonder what the exact requirements
> are. Can they run in any*thread*  (regardless of whether an AioContext
> even exists for that thread) or do they need to run in a thread that has
> called qemu_set_current_aio_context()?

I think they can run in any thread as long as they have called 
aio_context_acquire/release; later on, they will be able to run in any 
thread completely (which will be the underlying mechanism for multiqueue).

Paolo