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aio: warn about iohandler_ctx special casing

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The main loop has two AioContexts: qemu_aio_context and iohandler_ctx.
The main loop runs them both, but nested aio_poll() calls on
qemu_aio_context exclude iohandler_ctx.

Which one should qemu_get_current_aio_context() return when called from
the main loop? Document that it's always qemu_aio_context.

This has subtle effects on functions that use
qemu_get_current_aio_context(). For example, aio_co_reschedule_self()
does not work when moving from iohandler_ctx to qemu_aio_context because
qemu_get_current_aio_context() does not differentiate these two
AioContexts.

Document this in order to reduce the chance of future bugs.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20240506190622.56095-3-stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2024-05-06 15:06:22 -04:00 committed by Kevin Wolf
parent 719c6819ed
commit e669e800fc
1 changed files with 6 additions and 0 deletions
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6
include/block/aio.h
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@ -629,6 +629,9 @@ void aio_co_schedule(AioContext *ctx, Coroutine *co);
*
* Move the currently running coroutine to new_ctx. If the coroutine is already
* running in new_ctx, do nothing.
*
* Note that this function cannot reschedule from iohandler_ctx to
* qemu_aio_context.
*/
void coroutine_fn aio_co_reschedule_self(AioContext *new_ctx);
@ -661,6 +664,9 @@ void aio_co_enter(AioContext *ctx, Coroutine *co);
* If called from an IOThread this will be the IOThread's AioContext. If
* called from the main thread or with the "big QEMU lock" taken it
* will be the main loop AioContext.
*
* Note that the return value is never the main loop's iohandler_ctx and the
* return value is the main loop AioContext instead.
*/
AioContext *qemu_get_current_aio_context(void);