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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1761770078; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=XIn2kCTSgoGtJeeRn/iR5+f/1Vxi27UBr0nvXmUMNus=; b=VRHhKyX/qx3HZEQhhWGNwjuz9MiihZVvSlSfvT2snQHTgYOH0XJjPC8jzHYgJ3ep+iK/Hx kSdIoUbw49a89YcMW/F+PitLi+tBe+SOcJ5KKpnfVIIP17j6VR8bcKfvouHSi6IP/gg4Bs C+K4gsvVct7MfGwcKpn0vSRcr0kBVmc= X-MC-Unique: ucemEca8PiaJ_fHyC6ApUA-1 X-Mimecast-MFC-AGG-ID: ucemEca8PiaJ_fHyC6ApUA_1761770074 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: Stefan Hajnoczi , Paolo Bonzini , Kevin Wolf , hibriansong@gmail.com, qemu-block@nongnu.org, Hanna Czenczek , eblake@redhat.com Subject: [PATCH v5 10/12] aio-posix: add fdmon_ops->dispatch() Date: Wed, 29 Oct 2025 16:34:09 -0400 Message-ID: <20251029203411.445852-11-stefanha@redhat.com> In-Reply-To: <20251029203411.445852-1-stefanha@redhat.com> References: <20251029203411.445852-1-stefanha@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" The ppoll and epoll file descriptor monitoring implementations rely on the event loop's generic file descriptor, timer, and BH dispatch code to invoke user callbacks. The io_uring file descriptor monitoring implementation will need io_uring-specific dispatch logic for CQE handlers for custom SQEs. Introduce a new FDMonOps ->dispatch() callback that allows file descriptor monitoring implementations to invoke user callbacks. The next patch will use this new callback. Signed-off-by: Stefan Hajnoczi --- v5: - Add patch to introduce FDMonOps->dispatch() callback [Kevin] --- include/block/aio.h | 19 +++++++++++++++++++ util/aio-posix.c | 9 +++++++++ 2 files changed, 28 insertions(+) diff --git a/include/block/aio.h b/include/block/aio.h index 9562733fa7..b266daa58f 100644 --- a/include/block/aio.h +++ b/include/block/aio.h @@ -107,6 +107,25 @@ typedef struct { */ bool (*need_wait)(AioContext *ctx); =20 + /* + * dispatch: + * @ctx: the AioContext + * + * Dispatch any work that is specific to this file descriptor monitori= ng + * implementation. Usually the event loop's generic file descriptor + * monitoring, BH, and timer dispatching code is sufficient, but file + * descriptor monitoring implementations offering additional functiona= lity + * may need to implement this function for custom behavior. Called at a + * point in the event loop when it is safe to invoke user-defined + * callbacks. + * + * This function is optional and may be NULL. + * + * Returns: true if progress was made (see aio_poll()'s return value), + * false otherwise. + */ + bool (*dispatch)(AioContext *ctx); + /* * gsource_prepare: * @ctx: the AioContext diff --git a/util/aio-posix.c b/util/aio-posix.c index c0285a26a3..6ff36b6e51 100644 --- a/util/aio-posix.c +++ b/util/aio-posix.c @@ -385,10 +385,15 @@ void aio_dispatch(AioContext *ctx) AioHandlerList ready_list =3D QLIST_HEAD_INITIALIZER(ready_list); =20 qemu_lockcnt_inc(&ctx->list_lock); + aio_bh_poll(ctx); =20 ctx->fdmon_ops->gsource_dispatch(ctx, &ready_list); =20 + if (ctx->fdmon_ops->dispatch) { + ctx->fdmon_ops->dispatch(ctx); + } + /* block_ns is 0 because polling is disabled in the glib event loop */ aio_dispatch_ready_handlers(ctx, &ready_list, 0); =20 @@ -707,6 +712,10 @@ bool aio_poll(AioContext *ctx, bool blocking) block_ns =3D qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - start; } =20 + if (ctx->fdmon_ops->dispatch) { + progress |=3D ctx->fdmon_ops->dispatch(ctx); + } + progress |=3D aio_bh_poll(ctx); progress |=3D aio_dispatch_ready_handlers(ctx, &ready_list, block_ns); =20 --=20 2.51.0