From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists1p.gnu.org (lists1p.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 45DD6CD98F3 for ; Thu, 18 Jun 2026 11:00:44 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1waATJ-0006mw-7p; Thu, 18 Jun 2026 06:59:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1waATG-0006XV-JS for qemu-devel@nongnu.org; Thu, 18 Jun 2026 06:59:42 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1waATE-00027a-Ph for qemu-devel@nongnu.org; Thu, 18 Jun 2026 06:59:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1781780380; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9AQldYg5h2VAyCRnkpJZstjEVQUu9sZhbO2jPxkeD/k=; b=ioWIBFqdZTD0EqA3waIHXNyr+BE+wErkosU1ljW9/ThyC0lLvMdBoF/KvnJhh2OgVLmRwx GNuvWcE3It8Ud0RACifbuFgPjI+BM/nsVDRnwsvY04uPuKPIfUwptpbTZrbxfZSH7anatm nHS549kEnfa+s8OKPEYM64pVJ3m6eDc= Received: from mx-prod-mc-05.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-589-lxz6LWXKPjGy_jWEom7Zmg-1; Thu, 18 Jun 2026 06:59:38 -0400 X-MC-Unique: lxz6LWXKPjGy_jWEom7Zmg-1 X-Mimecast-MFC-AGG-ID: lxz6LWXKPjGy_jWEom7Zmg_1781780375 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-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 4BF0C1956051; Thu, 18 Jun 2026 10:59:35 +0000 (UTC) Received: from berrange.com (unknown [10.44.49.28]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id D6AA21956087; Thu, 18 Jun 2026 10:59:31 +0000 (UTC) From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: devel@lists.libvirt.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= , Christian Brauner , Markus Armbruster , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , "Dr. David Alan Gilbert" , Paolo Bonzini , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Subject: [PATCH v3 14/35] monitor: use class method for I/O thread request Date: Thu, 18 Jun 2026 11:58:15 +0100 Message-ID: <20260618105836.991609-15-berrange@redhat.com> In-Reply-To: <20260618105836.991609-1-berrange@redhat.com> References: <20260618105836.991609-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 8 X-Spam_score: 0.8 X-Spam_bar: / X-Spam_report: (0.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.445, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 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: qemu development 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 Introducing a virtual "requires_iothread" method allows the code to automatically initialize the I/O thread during object completion. Reviewed-by: Marc-André Lureau Signed-off-by: Daniel P. Berrangé --- monitor/monitor-internal.h | 14 +++++++++----- monitor/monitor.c | 22 ++++++++++++---------- monitor/qmp.c | 20 +++++++++++--------- 3 files changed, 32 insertions(+), 24 deletions(-) diff --git a/monitor/monitor-internal.h b/monitor/monitor-internal.h index 592f146331..efd21b8912 100644 --- a/monitor/monitor-internal.h +++ b/monitor/monitor-internal.h @@ -121,6 +121,12 @@ struct MonitorClass { * the monitor to accept further client input */ void (*accept_input)(Monitor *mon); + + /* + * If non-NULL and returns true, then an I/O thread + * is required for processing the monitor + */ + bool (*requires_iothread)(const Monitor *mon); }; struct Monitor { @@ -129,7 +135,6 @@ struct Monitor { CharFrontend chr; int suspend_cnt; /* Needs to be accessed atomically */ bool is_qmp; - bool use_io_thread; char *mon_cpu_path; QTAILQ_ENTRY(Monitor) entry; @@ -159,9 +164,8 @@ struct MonitorHMP { bool use_readline; /* * State used only in the thread "owning" the monitor. - * If @use_io_thread, this is @mon_iothread. (This does not actually happen - * in the current state of the code.) - * Else, it's the main thread. + * This is currently always the main thread, since + * HMP does not allow use of the I/O thread at this time. * These members can be safely accessed without locks. */ ReadLineState *rs; @@ -210,7 +214,7 @@ extern QemuMutex monitor_lock; extern MonitorList mon_list; void monitor_complete(Monitor *mon, Error **errp); -void monitor_iothread_init(Monitor *mon); +bool monitor_requires_iothread(const Monitor *mon); int monitor_can_read(void *opaque); void monitor_list_append(Monitor *mon); void monitor_fdsets_cleanup(void); diff --git a/monitor/monitor.c b/monitor/monitor.c index 2f16cd3053..b788669f1f 100644 --- a/monitor/monitor.c +++ b/monitor/monitor.c @@ -160,6 +160,12 @@ bool monitor_cur_is_qmp(void) return cur_mon && monitor_is_qmp(cur_mon); } +bool monitor_requires_iothread(const Monitor *mon) +{ + MonitorClass *cls = MONITOR_GET_CLASS(mon); + return cls->requires_iothread && cls->requires_iothread(mon); +} + /** * Is @mon is using readline? * Note: not all HMP monitors use readline, e.g., gdbserver has a @@ -561,7 +567,7 @@ int monitor_suspend(Monitor *mon) qatomic_inc(&mon->suspend_cnt); - if (mon->use_io_thread) { + if (monitor_requires_iothread(mon)) { /* * Kick I/O thread to make sure this takes effect. It'll be * evaluated again in prepare() of the watch object. @@ -594,7 +600,7 @@ void monitor_resume(Monitor *mon) if (qatomic_dec_fetch(&mon->suspend_cnt) == 0) { AioContext *ctx; - if (mon->use_io_thread) { + if (monitor_requires_iothread(mon)) { ctx = iothread_get_aio_context(mon_iothread); } else { ctx = qemu_get_aio_context(); @@ -632,14 +638,6 @@ void monitor_list_append(Monitor *mon) } } -void monitor_iothread_init(Monitor *mon) -{ - if (!mon_iothread) { - mon_iothread = iothread_create("mon_iothread", &error_abort); - } - mon->use_io_thread = true; -} - void monitor_cleanup(void) { /* @@ -734,6 +732,10 @@ void monitor_complete(Monitor *mon, Error **errp) return; } } + + if (monitor_requires_iothread(mon) && !mon_iothread) { + mon_iothread = iothread_create("mon_iothread", &error_abort); + } } int monitor_new(MonitorOptions *opts, bool allow_hmp, Error **errp) diff --git a/monitor/qmp.c b/monitor/qmp.c index ec17050a70..93f576c19d 100644 --- a/monitor/qmp.c +++ b/monitor/qmp.c @@ -100,6 +100,7 @@ static void monitor_qmp_set_pretty(Object *obj, bool val, Error **errp) } static void monitor_qmp_emit_event(Monitor *mon, QAPIEvent event, QDict *qdict); +static bool monitor_qmp_requires_iothread(const Monitor *mon); static void monitor_qmp_class_init(ObjectClass *cls, const void *data) { @@ -110,6 +111,7 @@ static void monitor_qmp_class_init(ObjectClass *cls, const void *data) monitor_qmp_set_pretty); moncls->emit_event = monitor_qmp_emit_event; + moncls->requires_iothread = monitor_qmp_requires_iothread; } static void handle_qmp_command(void *opaque, QObject *req, Error *err); @@ -136,6 +138,11 @@ static void monitor_qmp_emit_event(Monitor *mon, QAPIEvent event, QDict *qdict) qmp_send_response(qmp, qdict); } +static bool monitor_qmp_requires_iothread(const Monitor *mon) +{ + return qemu_chr_has_feature(mon->chr.chr, + QEMU_CHAR_FEATURE_GCONTEXT); +} static bool qmp_oob_enabled(MonitorQMP *mon) { @@ -146,7 +153,8 @@ static void monitor_qmp_caps_reset(MonitorQMP *mon) { memset(mon->capab_offered, 0, sizeof(mon->capab_offered)); memset(mon->capab, 0, sizeof(mon->capab)); - mon->capab_offered[QMP_CAPABILITY_OOB] = mon->parent_obj.use_io_thread; + mon->capab_offered[QMP_CAPABILITY_OOB] = + monitor_requires_iothread(MONITOR(mon)); } static void qmp_request_free(QMPRequest *req) @@ -562,7 +570,7 @@ static void monitor_qmp_setup_handlers_bh(void *opaque) MonitorQMP *mon = opaque; GMainContext *context; - assert(mon->parent_obj.use_io_thread); + assert(monitor_requires_iothread(MONITOR(mon))); context = iothread_get_g_main_context(mon_iothread); assert(context); qemu_chr_fe_set_handlers(&mon->parent_obj.chr, monitor_can_read, @@ -598,13 +606,7 @@ void monitor_new_qmp(const char *chardev_id, bool pretty, Error **errp) qemu_chr_fe_set_echo(&mon->parent_obj.chr, true); - /* Note: we run QMP monitor in I/O thread when @chr supports that */ - if (qemu_chr_has_feature(mon->parent_obj.chr.chr, - QEMU_CHAR_FEATURE_GCONTEXT)) { - monitor_iothread_init(&mon->parent_obj); - } - - if (mon->parent_obj.use_io_thread) { + if (monitor_requires_iothread(MONITOR(mon))) { /* * Make sure the old iowatch is gone. It's possible when * e.g. the chardev is in client mode, with wait=on. -- 2.54.0