Re: [PATCH] io: mark mixed functions that can suspend

[Daniel P . Berrangé]

On Thu, Apr 06, 2023 at 12:28:00PM +0200, Paolo Bonzini wrote:
> There should be no paths from a coroutine_fn to aio_poll, however in
> practice coroutine_mixed_fn will call aio_poll in the !qemu_in_coroutine()
> path.  By marking mixed functions, we can track accurately the call paths
> that execute entirely in coroutine context, and find more missing
> coroutine_fn markers.  This results in more accurate checks that
> coroutine code does not end up blocking.
> 
> If the marking were extended transitively to all functions that call
> these ones, static analysis could be done much more efficiently.
> However, this is a start and makes it possible to use vrc's path-based
> searches to find potential bugs where coroutine_fns call blocking functions.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  include/io/channel.h | 78 ++++++++++++++++++++++----------------------
>  io/channel.c         | 78 ++++++++++++++++++++++----------------------
>  2 files changed, 78 insertions(+), 78 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

With regards,
Daniel
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