Re: [Qemu-devel] [QEMU-devel][PATCH v4 0/2] Fix concurrent aio_poll/set_fd_handler.

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Thu, Dec 20, 2018 at 04:20:28PM +0100, remy.noel@blade-group.com wrote:
> From: Remy Noel <remy.noel@blade-group.com>
> 
> It is possible for an io_poll/read/write callback to be concurrently executed along
> with an aio_set_fd_handlers. This can cause all sorts of problems, like
> a NULL callback or a bad opaque pointer.
> 
> V2:
>     * Do not use RCU anymore as it inccurs a performance loss
> V3:
>     * Don't drop revents when a handler is modified [Stefan]
> V4:
>     * Unregister fd from ctx epoll when removing fd_handler [Paolo]
> 
> Remy Noel (2):
>   aio-posix: Unregister fd from ctx epoll when removing fd_handler.
>   aio-posix: Fix concurrent aio_poll/set_fd_handler.
> 
>  util/aio-posix.c | 90 +++++++++++++++++++++++++++++-------------------
>  util/aio-win32.c | 67 ++++++++++++++++-------------------
>  2 files changed, 84 insertions(+), 73 deletions(-)
> 
> -- 
> 2.19.2
> 

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

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