From patchwork Tue Jun 11 17:36:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 13694056 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 81064C27C65 for ; Tue, 11 Jun 2024 17:38:18 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sH5Qv-00007x-4w; Tue, 11 Jun 2024 13:37:21 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sH5Qt-00006t-Sq for qemu-devel@nongnu.org; Tue, 11 Jun 2024 13:37:19 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sH5Qs-0008UT-Gr for qemu-devel@nongnu.org; Tue, 11 Jun 2024 13:37:19 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1718127437; 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=ekDyI0XrbGkORk/+Y7DVMqIWcACoq55sA4lf/J9YDMA=; b=RnIB1mEXWpT7SomabiltiMKd2L5cLuvVdal/YvYqEt8tDzEA0T5Yx+AXVVGHNv7gu3V0ra UXolKcQunMBIja73cLbCr21Qcmkz2Ni8JjK2E//dlw3r2soon8yxleog8ad/Y73/cmYr08 aPwnVObMt/doI+UEru9XruWLKg5lorc= Received: from mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-90-4Nn3CKfaPj-wGpzR5HfSNQ-1; Tue, 11 Jun 2024 13:37:11 -0400 X-MC-Unique: 4Nn3CKfaPj-wGpzR5HfSNQ-1 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 2E5A619560BD; Tue, 11 Jun 2024 17:37:10 +0000 (UTC) Received: from merkur.fritz.box (unknown [10.39.192.130]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id D2B5619560AB; Tue, 11 Jun 2024 17:37:08 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org Subject: [PULL 3/8] aio: warn about iohandler_ctx special casing Date: Tue, 11 Jun 2024 19:36:53 +0200 Message-ID: <20240611173658.231831-4-kwolf@redhat.com> In-Reply-To: <20240611173658.231831-1-kwolf@redhat.com> References: <20240611173658.231831-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass client-ip=170.10.133.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 11 X-Spam_score: 1.1 X-Spam_bar: + X-Spam_report: (1.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.141, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Stefan Hajnoczi 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 Message-ID: <20240506190622.56095-3-stefanha@redhat.com> Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- include/block/aio.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/block/aio.h b/include/block/aio.h index 8378553eb9..4ee81936ed 100644 --- a/include/block/aio.h +++ b/include/block/aio.h @@ -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);