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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1783346377; 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=aekispRBE71bK8cj0hULuFEvR+XWf6HWVh3460aRpsM=; b=MrFD7aNmIH74BKceQMdnl1ZprEIaFjiQ6gP44RcL5dsuPtTG9jNFFzz7VQYZ/VHGfGe40z /daSdLP24Sdgo4B0/vae6V/Bs2X4pRW+I1PlkczQlkfCcrABVwaqYYCJNa9ofycw2HVx8s 41RTp3WxVdMibXKqXyQ/YtIl060PQbA= X-MC-Unique: 99fFQ5drNjWYERTa-hUQdw-1 X-Mimecast-MFC-AGG-ID: 99fFQ5drNjWYERTa-hUQdw_1783346370 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: Christian Brauner , devel@lists.libvirt.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Paolo Bonzini , Peter Krempa , Markus Armbruster , "Dr. David Alan Gilbert" , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Subject: [PATCH v7 15/35] monitor: use class method for I/O thread request Date: Mon, 6 Jul 2026 14:58:03 +0100 Message-ID: <20260706135824.2623960-16-berrange@redhat.com> In-Reply-To: <20260706135824.2623960-1-berrange@redhat.com> References: <20260706135824.2623960-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=170.10.133.124; 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_H4=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1783346488431158500 Introducing a virtual "requires_iothread" method allows the code to automatically initialize the I/O thread during object completion. Reviewed-by: Marc-Andr=C3=A9 Lureau Tested-by: Peter Krempa Signed-off-by: Daniel P. Berrang=C3=A9 --- 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); }; =20 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; =20 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 h= appen - * 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; =20 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 6e63e7a5c7..1b2bdcf68f 100644 --- a/monitor/monitor.c +++ b/monitor/monitor.c @@ -162,6 +162,12 @@ bool monitor_cur_is_qmp(void) return cur_mon && monitor_is_qmp(cur_mon); } =20 +bool monitor_requires_iothread(const Monitor *mon) +{ + MonitorClass *cls =3D 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 @@ -563,7 +569,7 @@ int monitor_suspend(Monitor *mon) =20 qatomic_inc(&mon->suspend_cnt); =20 - 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. @@ -596,7 +602,7 @@ void monitor_resume(Monitor *mon) if (qatomic_dec_fetch(&mon->suspend_cnt) =3D=3D 0) { AioContext *ctx; =20 - if (mon->use_io_thread) { + if (monitor_requires_iothread(mon)) { ctx =3D iothread_get_aio_context(mon_iothread); } else { ctx =3D qemu_get_aio_context(); @@ -634,14 +640,6 @@ void monitor_list_append(Monitor *mon) } } =20 -void monitor_iothread_init(Monitor *mon) -{ - if (!mon_iothread) { - mon_iothread =3D iothread_create("mon_iothread", &error_abort); - } - mon->use_io_thread =3D true; -} - void monitor_cleanup(void) { /* @@ -743,6 +741,10 @@ void monitor_complete(Monitor *mon, Error **errp) return; } } + + if (monitor_requires_iothread(mon) && !mon_iothread) { + mon_iothread =3D iothread_create("mon_iothread", &error_abort); + } } =20 int monitor_new(MonitorOptions *opts, bool allow_hmp, Error **errp) diff --git a/monitor/qmp.c b/monitor/qmp.c index d732fff9a3..8bbe25d8de 100644 --- a/monitor/qmp.c +++ b/monitor/qmp.c @@ -100,6 +100,7 @@ static void monitor_qmp_set_pretty(Object *obj, bool va= l, Error **errp) } =20 static void monitor_qmp_emit_event(Monitor *mon, QAPIEvent event, QDict *q= dict); +static bool monitor_qmp_requires_iothread(const Monitor *mon); =20 static void monitor_qmp_class_init(ObjectClass *cls, const void *data) { @@ -110,6 +111,7 @@ static void monitor_qmp_class_init(ObjectClass *cls, co= nst void *data) monitor_qmp_set_pretty); =20 moncls->emit_event =3D monitor_qmp_emit_event; + moncls->requires_iothread =3D monitor_qmp_requires_iothread; } =20 static void handle_qmp_command(void *opaque, QObject *req, Error *err); @@ -136,6 +138,11 @@ static void monitor_qmp_emit_event(Monitor *mon, QAPIE= vent event, QDict *qdict) qmp_send_response(qmp, qdict); } =20 +static bool monitor_qmp_requires_iothread(const Monitor *mon) +{ + return qemu_chr_has_feature(mon->chr.chr, + QEMU_CHAR_FEATURE_GCONTEXT); +} =20 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] =3D mon->parent_obj.use_io_thre= ad; + mon->capab_offered[QMP_CAPABILITY_OOB] =3D + monitor_requires_iothread(MONITOR(mon)); } =20 static void qmp_request_free(QMPRequest *req) @@ -562,7 +570,7 @@ static void monitor_qmp_setup_handlers_bh(void *opaque) MonitorQMP *mon =3D opaque; GMainContext *context; =20 - assert(mon->parent_obj.use_io_thread); + assert(monitor_requires_iothread(MONITOR(mon))); context =3D 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 *id, const char *chard= ev_id, =20 qemu_chr_fe_set_echo(&mon->parent_obj.chr, true); =20 - /* 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=3Don. --=20 2.55.0