From patchwork Tue Jul 6 19:14:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Li Zhang X-Patchwork-Id: 1501461 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=pSez69Bk; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4GKC2n0lvHz9sV8 for ; Wed, 7 Jul 2021 05:16:15 +1000 (AEST) Received: from localhost ([::1]:53448 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m0qYF-00031m-Vo for incoming@patchwork.ozlabs.org; Tue, 06 Jul 2021 15:16:12 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35018) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m0qXP-00031V-I9 for qemu-devel@nongnu.org; Tue, 06 Jul 2021 15:15:19 -0400 Received: from mail-wr1-x42f.google.com ([2a00:1450:4864:20::42f]:35607) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1m0qXN-0003vr-DY for qemu-devel@nongnu.org; Tue, 06 Jul 2021 15:15:19 -0400 Received: by mail-wr1-x42f.google.com with SMTP id q17so245604wrv.2 for ; Tue, 06 Jul 2021 12:15:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=SPMyOq5Wvvo3dgH6djgGwx1IYio9YYNItPb4BKshS6Q=; b=pSez69BkoHBvOFGXH8HueSlwD/cdS/uS6uSasqsUIg5bi7rvlvQhth19H3sJSr34zs F5gll8/S5pQcc4mPjZXz6W+K+0HntGWWSQgOwDDVvP1kOwz1X8iWKYqGTjZjm0dBy0p4 n1LMToZOY8+E43VHsHtNweAoBN1DFXrMCCGGfwJ4l8xwm6XmFXNIzRpZvqixlrm+oYqD oPpoU3wxZ4Y+VSW7I3I2d0Suj+4b4NASbcOtktqufEazneVIEC0YIxInJ8zSpMpSQVKS tlVQK2FfWvcOoJYFaRIewaDCAW2rTK9uEA6WtGDDyi7ctg7lKNeoUmTsEEG+13YLGBCm 5asg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=SPMyOq5Wvvo3dgH6djgGwx1IYio9YYNItPb4BKshS6Q=; b=JyxhfYbbWCVQS/oWrgBX4IdnZ+y2m5crHfvPqQyiZvNheVed39rpSCdnMi6zn7tWf1 MeaGEyIpeRauVK3KE7Y+lQfcnSsJV4ANuN4DnmLjihtGpHlhBm6DL236CdEmQfn2leOr /vQUf1KOrZYtoWqmouZT7IXt/hjqZBaMvLkifJlyUtCbXVoCF6aWEdQUBufUdSiWi4bq L/VW1OSEDX9iOj7NRJldoOgW69zAKbErxFVBcWvjdVLjmssYMsBOOMzYpILFm5duKXNW eV2BAiRtFSkU9DDGDaSHn0PD/m7Bf8VVLdjZQY4OLkzqtHGWX3GqF3PEUpzmkdt73ua5 gkaA== X-Gm-Message-State: AOAM532dEvu4cOMBxfROSxsVEfYFvqdPOKU/77C/6WvSlQy6mk4Vj0Xf n6rrTizqISi8qpbewV7cPzA= X-Google-Smtp-Source: ABdhPJwbMpohsJ+1nrLqGDaL17HEB+Mbc2I5IuuSXn+rCO/gR0XyWWEqwzLX6nm77mRawwiWV3CQhQ== X-Received: by 2002:a5d:644c:: with SMTP id d12mr5997538wrw.129.1625598914444; Tue, 06 Jul 2021 12:15:14 -0700 (PDT) Received: from lb01556.speedport.ip (p200300f11706da9e87913749ebbd0132.dip0.t-ipconnect.de. [2003:f1:1706:da9e:8791:3749:ebbd:132]) by smtp.gmail.com with ESMTPSA id p3sm3791522wmq.17.2021.07.06.12.15.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Jul 2021 12:15:14 -0700 (PDT) From: Li Zhang X-Google-Original-From: Li Zhang To: armbru@redhat.com, marcandre.lureau@gmail.com, pankaj.gupta.linux@gmail.com, qemu-devel@nongnu.org Subject: [PATCH v3 1/2] qmp: Support chardev-change for QMP device Date: Tue, 6 Jul 2021 21:14:51 +0200 Message-Id: <20210706191452.127893-1-li.zhang@ionos.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::42f; envelope-from=zhlcindy@gmail.com; helo=mail-wr1-x42f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Li Zhang Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" For some scenarios, we'd like to hot-add a monitor device. But QEMU doesn't support that, yet. It does support hot-swapping character backends with QMP command chardev-change. This lets us pre-add a monitor with a null character backend, then chardev-change to a socket backend. Except the chardev-change fails with "Chardev user does not support chardev hotswap" because monitors don't provide the required callback. Implement it for QMP monitors. Signed-off-by: Li Zhang --- v3 -> v2: * rework the patch according. * refactor the source code of chardev. monitor/monitor-internal.h | 1 + monitor/monitor.c | 4 +- monitor/qmp.c | 83 +++++++++++++++++++++++++++----------- 3 files changed, 62 insertions(+), 26 deletions(-) diff --git a/monitor/monitor-internal.h b/monitor/monitor-internal.h index 9c3a09cb01..162f73119b 100644 --- a/monitor/monitor-internal.h +++ b/monitor/monitor-internal.h @@ -182,5 +182,6 @@ int get_monitor_def(Monitor *mon, int64_t *pval, const char *name); void help_cmd(Monitor *mon, const char *name); void handle_hmp_command(MonitorHMP *mon, const char *cmdline); int hmp_compare_cmd(const char *name, const char *list); +void monitor_flush_locked(Monitor *mon); #endif diff --git a/monitor/monitor.c b/monitor/monitor.c index b90c0f4051..1b05ef3bdb 100644 --- a/monitor/monitor.c +++ b/monitor/monitor.c @@ -154,8 +154,6 @@ static inline bool monitor_is_hmp_non_interactive(const Monitor *mon) return !monitor_uses_readline(container_of(mon, MonitorHMP, common)); } -static void monitor_flush_locked(Monitor *mon); - static gboolean monitor_unblocked(GIOChannel *chan, GIOCondition cond, void *opaque) { @@ -169,7 +167,7 @@ static gboolean monitor_unblocked(GIOChannel *chan, GIOCondition cond, } /* Caller must hold mon->mon_lock */ -static void monitor_flush_locked(Monitor *mon) +void monitor_flush_locked(Monitor *mon) { int rc; size_t len; diff --git a/monitor/qmp.c b/monitor/qmp.c index 092c527b6f..92c704373f 100644 --- a/monitor/qmp.c +++ b/monitor/qmp.c @@ -46,6 +46,8 @@ struct QMPRequest { typedef struct QMPRequest QMPRequest; QmpCommandList qmp_commands, qmp_cap_negotiation_commands; +static void monitor_qmp_setup_handlers_bh(void *opaque); +static void monitor_backend_init(MonitorQMP *mon, Chardev *chr); static bool qmp_oob_enabled(MonitorQMP *mon) { @@ -481,6 +483,35 @@ void monitor_data_destroy_qmp(MonitorQMP *mon) g_queue_free(mon->qmp_requests); } +static bool mointor_in_list(Monitor *mon) +{ + Monitor *mon_tmp; + QTAILQ_FOREACH(mon_tmp, &mon_list, entry) { + if (mon_tmp == mon) { + return true; + } + } + return false; +} + +static int monitor_qmp_change(void *opaque) +{ + MonitorQMP *mon = opaque; + + monitor_data_init(&mon->common, true, false, + qemu_chr_has_feature(mon->common.chr.chr, + QEMU_CHAR_FEATURE_GCONTEXT)); + monitor_backend_init(mon, mon->common.chr.chr); + qemu_mutex_lock(&mon->common.mon_lock); + if (mon->common.out_watch) { + mon->common.out_watch = 0; + monitor_flush_locked(&mon->common); + } + qemu_mutex_unlock(&mon->common.mon_lock); + + return 0; +} + static void monitor_qmp_setup_handlers_bh(void *opaque) { MonitorQMP *mon = opaque; @@ -491,30 +522,14 @@ static void monitor_qmp_setup_handlers_bh(void *opaque) assert(context); qemu_chr_fe_set_handlers(&mon->common.chr, monitor_can_read, monitor_qmp_read, monitor_qmp_event, - NULL, &mon->common, context, true); - monitor_list_append(&mon->common); + monitor_qmp_change, &mon->common, context, true); + + if (!mointor_in_list(&mon->common)) + monitor_list_append(&mon->common); } -void monitor_init_qmp(Chardev *chr, bool pretty, Error **errp) +static void monitor_backend_init(MonitorQMP *mon, Chardev *chr) { - MonitorQMP *mon = g_new0(MonitorQMP, 1); - - if (!qemu_chr_fe_init(&mon->common.chr, chr, errp)) { - g_free(mon); - return; - } - qemu_chr_fe_set_echo(&mon->common.chr, true); - - /* Note: we run QMP monitor in I/O thread when @chr supports that */ - monitor_data_init(&mon->common, true, false, - qemu_chr_has_feature(chr, QEMU_CHAR_FEATURE_GCONTEXT)); - - mon->pretty = pretty; - - qemu_mutex_init(&mon->qmp_queue_lock); - mon->qmp_requests = g_queue_new(); - - json_message_parser_init(&mon->parser, handle_qmp_command, mon, NULL); if (mon->common.use_io_thread) { /* * Make sure the old iowatch is gone. It's possible when @@ -532,7 +547,29 @@ void monitor_init_qmp(Chardev *chr, bool pretty, Error **errp) } else { qemu_chr_fe_set_handlers(&mon->common.chr, monitor_can_read, monitor_qmp_read, monitor_qmp_event, - NULL, &mon->common, NULL, true); - monitor_list_append(&mon->common); + monitor_qmp_change, &mon->common, NULL, true); + if (!mointor_in_list(&mon->common)) { + monitor_list_append(&mon->common); + } + } +} + +void monitor_init_qmp(Chardev *chr, bool pretty, Error **errp) +{ + MonitorQMP *mon = g_new0(MonitorQMP, 1); + + if (!qemu_chr_fe_init(&mon->common.chr, chr, errp)) { + g_free(mon); + return; } + qemu_chr_fe_set_echo(&mon->common.chr, true); + /* Note: we run QMP monitor in I/O thread when @chr supports that */ + monitor_data_init(&mon->common, true, false, + qemu_chr_has_feature(chr, QEMU_CHAR_FEATURE_GCONTEXT)); + + mon->pretty = pretty; + qemu_mutex_init(&mon->qmp_queue_lock); + mon->qmp_requests = g_queue_new(); + json_message_parser_init(&mon->parser, handle_qmp_command, mon, NULL); + monitor_backend_init(mon, chr); } From patchwork Tue Jul 6 19:14:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Li Zhang X-Patchwork-Id: 1501462 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=ZwBylfXQ; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4GKC4X4gLvz9sV8 for ; Wed, 7 Jul 2021 05:17:48 +1000 (AEST) Received: from localhost ([::1]:55584 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m0qZm-0004Qs-Fe for incoming@patchwork.ozlabs.org; Tue, 06 Jul 2021 15:17:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35020) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m0qXQ-00031d-6B for qemu-devel@nongnu.org; Tue, 06 Jul 2021 15:15:20 -0400 Received: from mail-wr1-x42f.google.com ([2a00:1450:4864:20::42f]:34369) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1m0qXO-0003vu-6R for qemu-devel@nongnu.org; Tue, 06 Jul 2021 15:15:19 -0400 Received: by mail-wr1-x42f.google.com with SMTP id p8so251025wrr.1 for ; Tue, 06 Jul 2021 12:15:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=xhEYnp3bVi89arzNzlyGinB4KyibAFhtXkK1ythb5+I=; b=ZwBylfXQLnIfYzKV24KEqNqtYl4Rj1eVfGMxqlK9sckRnkfvEHXXinvl+4TSnxsUdb Pm/ezoHThjiR9Q1QeA6wsmvKzZEo50qNajCtQXUrh1QcCXaMJVpRBtZkqFlImK2Sq1bC DjdgRCXOLsoryR+p/HT70TAf9JcZcU0AnDvl9L6qADG8OjQNWwz8fNOrbdpqhMP6H4YD o0VGwY4fhFH9pUhK0rNSdnvj9KMcT4hWCRH2cJAVe2fQdT+kZjCOmvrLxXc6nIKhgVz4 TaImA5cWrp7jLDTmYCfVLQcc49shCjoKIvSvodecLeXWXXx/1lN/wdy6zpAhgSylWtDt iSrw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=xhEYnp3bVi89arzNzlyGinB4KyibAFhtXkK1ythb5+I=; b=S8+MKRDe9uboBEeBKvYtmzLycO+VLdezR6/CVisf1JF+SinN4VqntT/RyHcJUPwbTo Wu0dT3pmTjSg6dvmWNvlZcDQ3LR+o6laFu9rvcw3/wz4AD+If9clynmtgXDZlymHkGkl 2tjtRO55gbiUsWtNc2xYB7arI55MIlA5AlDjhZrwslMH2CRgKnc9xlq0kVIgb2KV0wS0 kuVj4NdrabLkGKThLge00yvD8M7gmIHN0qgsAQlx5qWHj2Tu6b3/gtKOOoa57OX/QoIx d0owHc/LHlNsqzG4ApE9W8mZ1vE2T4LWj7Vxbln4lAo357BAFKDG/bou+De4OdUqaf6c X91Q== X-Gm-Message-State: AOAM531BstGf9UBG8HgjUudqwzL1WjYH2wE03CL6oLxcpO3XevCx0CZC +u36oA0+QBPmR5Qi+/6eZcY= X-Google-Smtp-Source: ABdhPJytF6jc9ZQuZfNB5M32Dy+17fQkXxBNNYqz/Hch7DSw/ZvVO2btEy86xEOC7R0Zby4sovYAUQ== X-Received: by 2002:a5d:548a:: with SMTP id h10mr23208721wrv.273.1625598915255; Tue, 06 Jul 2021 12:15:15 -0700 (PDT) Received: from lb01556.speedport.ip (p200300f11706da9e87913749ebbd0132.dip0.t-ipconnect.de. [2003:f1:1706:da9e:8791:3749:ebbd:132]) by smtp.gmail.com with ESMTPSA id p3sm3791522wmq.17.2021.07.06.12.15.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Jul 2021 12:15:14 -0700 (PDT) From: Li Zhang X-Google-Original-From: Li Zhang To: armbru@redhat.com, marcandre.lureau@gmail.com, pankaj.gupta.linux@gmail.com, qemu-devel@nongnu.org Subject: [PATCH v3 2/2] chardev: refactor qmp_chardev_add and qmp_chardev_change Date: Tue, 6 Jul 2021 21:14:52 +0200 Message-Id: <20210706191452.127893-2-li.zhang@ionos.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210706191452.127893-1-li.zhang@ionos.com> References: <20210706191452.127893-1-li.zhang@ionos.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::42f; envelope-from=zhlcindy@gmail.com; helo=mail-wr1-x42f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Li Zhang Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" To improve the problematic source code as Markus mentioned before and some redundant source code, it is refactored in the functions qmp_chardev_add and qmp_chardev_change. https://lists.nongnu.org/archive/html/qemu-devel/2021-04/msg03167.html Signed-off-by: Li Zhang --- chardev/char.c | 72 ++++++++++++++++++++++++++------------------------ 1 file changed, 37 insertions(+), 35 deletions(-) diff --git a/chardev/char.c b/chardev/char.c index d959eec522..da23e1bd71 100644 --- a/chardev/char.c +++ b/chardev/char.c @@ -1028,23 +1028,10 @@ Chardev *qemu_chardev_new(const char *id, const char *typename, return chr; } -ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend, - Error **errp) +static ChardevReturn *chardev_add(const char *id, Chardev *chr, + Error **errp) { - const ChardevClass *cc; ChardevReturn *ret; - Chardev *chr; - - cc = char_get_class(ChardevBackendKind_str(backend->type), errp); - if (!cc) { - return NULL; - } - - chr = chardev_new(id, object_class_get_name(OBJECT_CLASS(cc)), - backend, NULL, false, errp); - if (!chr) { - return NULL; - } if (!object_property_try_add_child(get_chardevs_root(), id, OBJECT(chr), errp)) { @@ -1062,6 +1049,26 @@ ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend, return ret; } +ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend, + Error **errp) +{ + const ChardevClass *cc; + Chardev *chr; + + cc = char_get_class(ChardevBackendKind_str(backend->type), errp); + if (!cc) { + return NULL; + } + + chr = chardev_new(id, object_class_get_name(OBJECT_CLASS(cc)), + backend, NULL, false, errp); + if (!chr) { + return NULL; + } + + return chardev_add(id, chr, errp); +} + ChardevReturn *qmp_chardev_change(const char *id, ChardevBackend *backend, Error **errp) { @@ -1070,7 +1077,6 @@ ChardevReturn *qmp_chardev_change(const char *id, ChardevBackend *backend, Chardev *chr, *chr_new; bool closed_sent = false; bool handover_yank_instance; - ChardevReturn *ret; chr = qemu_chr_find(id); if (!chr) { @@ -1078,6 +1084,12 @@ ChardevReturn *qmp_chardev_change(const char *id, ChardevBackend *backend, return NULL; } + cc = CHARDEV_GET_CLASS(chr); + cc_new = char_get_class(ChardevBackendKind_str(backend->type), errp); + if (!cc_new) { + return NULL; + } + if (CHARDEV_IS_MUX(chr)) { error_setg(errp, "Mux device hotswap not supported yet"); return NULL; @@ -1092,8 +1104,13 @@ ChardevReturn *qmp_chardev_change(const char *id, ChardevBackend *backend, be = chr->be; if (!be) { /* easy case */ - object_unparent(OBJECT(chr)); - return qmp_chardev_add(id, backend, errp); + chr_new = chardev_new(id, object_class_get_name(OBJECT_CLASS(cc_new)), + backend, NULL, false, errp); + if (!chr_new) { + return NULL; + } + + goto out; } if (!be->chr_be_change) { @@ -1101,12 +1118,6 @@ ChardevReturn *qmp_chardev_change(const char *id, ChardevBackend *backend, return NULL; } - cc = CHARDEV_GET_CLASS(chr); - cc_new = char_get_class(ChardevBackendKind_str(backend->type), errp); - if (!cc_new) { - return NULL; - } - /* * The new chardev should not register a yank instance if the current * chardev has registered one already. @@ -1147,18 +1158,9 @@ ChardevReturn *qmp_chardev_change(const char *id, ChardevBackend *backend, */ chr->handover_yank_instance = handover_yank_instance; +out: object_unparent(OBJECT(chr)); - object_property_add_child(get_chardevs_root(), chr_new->label, - OBJECT(chr_new)); - object_unref(OBJECT(chr_new)); - - ret = g_new0(ChardevReturn, 1); - if (CHARDEV_IS_PTY(chr_new)) { - ret->pty = g_strdup(chr_new->filename + 4); - ret->has_pty = true; - } - - return ret; + return chardev_add(id, chr_new, errp); } void qmp_chardev_remove(const char *id, Error **errp)