From patchwork Sun Apr 26 19:25:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Straub X-Patchwork-Id: 283927 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6B4FCC54FCB for ; Sun, 26 Apr 2020 19:36:38 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 3C5AA20700 for ; Sun, 26 Apr 2020 19:36:38 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Sun, 26 Apr 2020 15:26:07 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=web.de; s=dbaedf251592; t=1587929155; bh=B9XY0V6HG/toYTYIEUFnzTvAwLVvOsgRzhHhxFxq1Xk=; h=X-UI-Sender-Class:Date:From:To:Cc:Subject:In-Reply-To:References; b=cGSJkMsFmBDBtdDVqFRt09CcjauLL/Ew0xJl1i9Qi3TVKQNgH/E7ShYSIhW/qUaij VZZXPHREWD3vvxKSJk1VX/jCqBsGFqnysfiz+K171wLwAAMB2Xp0tcqy4icw6DGaak UbenyxpO5zw3ewUtNFVnf7tIcUmFaYHfDS3pwh3E= X-UI-Sender-Class: c548c8c5-30a9-4db5-a2e7-cb6cb037b8f9 Received: from luklap ([89.247.255.95]) by smtp.web.de (mrweb102 [213.165.67.124]) with ESMTPSA (Nemesis) id 0LyDph-1j5CGU14C5-015bYx; Sun, 26 Apr 2020 21:25:55 +0200 Date: Sun, 26 Apr 2020 21:25:54 +0200 From: Lukas Straub To: qemu-devel Subject: [PATCH v2 5/6] net/colo-compare.c, softmmu/vl.c: Check that colo-compare is active Message-ID: <9cfb9136badd63804dab1331658803cf70d0cc3d.1587927878.git.lukasstraub2@web.de> In-Reply-To: References: MIME-Version: 1.0 X-Provags-ID: V03:K1:gTmJjSM3VizveceaIutLKB2t+8lYiqnFCFpGJpxZznR5WCtttvJ AFwabXg/wIsmkDIa4IIg6T15As+NhlAZx1wWMtCXHFn04PhL2SZLe1fJfUID/3GubncPCLJ FfSkq0G9bA54hnR4/Ytuj7/sLc/ZwPugHsTNTbRfTneAxIqtbYFtRBEbVKscQJ3MaUxNDv+ PhBFlxVDpnJ79S5zJJydw== X-UI-Out-Filterresults: notjunk:1; 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envelope-from=lukasstraub2@web.de; helo=mout.web.de X-detected-operating-system: by eggs.gnu.org: First seen = 2020/04/26 15:26:05 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Received-From: 212.227.17.12 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: Zhang Chen , Jason Wang , Paolo Bonzini , Li Zhijian , =?utf-8?q?Marc-Andr=C3=A9?= Lureau Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" If the colo-compare object is removed before failover and a checkpoint happens, qemu crashes because it tries to lock the destroyed event_mtx in colo_notify_compares_event. Fix this by checking if everything is initialized by introducing a new variable colo_compare_active which is protected by a new mutex colo_compare_mutex. The new mutex also protects against concurrent access of the net_compares list and makes sure that colo_notify_compares_event isn't active while we destroy event_mtx and event_complete_cond. With this it also is again possible to use colo without colo-compare (periodic mode) and to use multiple colo-compare for multiple network interfaces. Signed-off-by: Lukas Straub --- net/colo-compare.c | 34 ++++++++++++++++++++++++++++------ net/colo-compare.h | 1 + softmmu/vl.c | 2 ++ 3 files changed, 31 insertions(+), 6 deletions(-) diff --git a/net/colo-compare.c b/net/colo-compare.c index 6634911770..a82bb27a67 100644 --- a/net/colo-compare.c +++ b/net/colo-compare.c @@ -54,6 +54,8 @@ static NotifierList colo_compare_notifiers = #define REGULAR_PACKET_CHECK_MS 3000 #define DEFAULT_TIME_OUT_MS 3000 +static QemuMutex colo_compare_mutex; +static bool colo_compare_active = false; static QemuMutex event_mtx; static QemuCond event_complete_cond; static int event_unhandled_count; @@ -912,6 +914,12 @@ static void check_old_packet_regular(void *opaque) void colo_notify_compares_event(void *opaque, int event, Error **errp) { CompareState *s; + qemu_mutex_lock(&colo_compare_mutex); + + if (!colo_compare_active) { + qemu_mutex_unlock(&colo_compare_mutex); + return; + } qemu_mutex_lock(&event_mtx); QTAILQ_FOREACH(s, &net_compares, next) { @@ -925,6 +933,7 @@ void colo_notify_compares_event(void *opaque, int event, Error **errp) } qemu_mutex_unlock(&event_mtx); + qemu_mutex_unlock(&colo_compare_mutex); } static void colo_compare_timer_init(CompareState *s) @@ -1278,16 +1287,20 @@ static void colo_compare_complete(UserCreatable *uc, Error **errp) s->vnet_hdr); } + qemu_mutex_lock(&colo_compare_mutex); + if (!colo_compare_active) { + qemu_mutex_init(&event_mtx); + qemu_cond_init(&event_complete_cond); + colo_compare_active = true; + } QTAILQ_INSERT_TAIL(&net_compares, s, next); + qemu_mutex_unlock(&colo_compare_mutex); s->sendco.done = true; g_queue_init(&s->sendco.send_list); g_queue_init(&s->conn_list); - qemu_mutex_init(&event_mtx); - qemu_cond_init(&event_complete_cond); - s->connection_track_table = g_hash_table_new_full(connection_key_hash, connection_key_equal, g_free, @@ -1382,12 +1395,19 @@ static void colo_compare_finalize(Object *obj) qemu_bh_delete(s->event_bh); + qemu_mutex_lock(&colo_compare_mutex); QTAILQ_FOREACH(tmp, &net_compares, next) { if (tmp == s) { QTAILQ_REMOVE(&net_compares, s, next); break; } } + if (QTAILQ_EMPTY(&net_compares)) { + colo_compare_active = false; + qemu_mutex_destroy(&event_mtx); + qemu_cond_destroy(&event_complete_cond); + } + qemu_mutex_unlock(&colo_compare_mutex); /* Release all unhandled packets after compare thead exited */ g_queue_foreach(&s->conn_list, colo_flush_packets, s); @@ -1403,15 +1423,17 @@ static void colo_compare_finalize(Object *obj) object_unref(OBJECT(s->iothread)); } - qemu_mutex_destroy(&event_mtx); - qemu_cond_destroy(&event_complete_cond); - g_free(s->pri_indev); g_free(s->sec_indev); g_free(s->outdev); g_free(s->notify_dev); } +void colo_compare_init_globals(void) +{ + qemu_mutex_init(&colo_compare_mutex); +} + static const TypeInfo colo_compare_info = { .name = TYPE_COLO_COMPARE, .parent = TYPE_OBJECT, diff --git a/net/colo-compare.h b/net/colo-compare.h index 22ddd512e2..eb483ac586 100644 --- a/net/colo-compare.h +++ b/net/colo-compare.h @@ -17,6 +17,7 @@ #ifndef QEMU_COLO_COMPARE_H #define QEMU_COLO_COMPARE_H +void colo_compare_init_globals(void); void colo_notify_compares_event(void *opaque, int event, Error **errp); void colo_compare_register_notifier(Notifier *notify); void colo_compare_unregister_notifier(Notifier *notify); diff --git a/softmmu/vl.c b/softmmu/vl.c index 32c0047889..a913ed5469 100644 --- a/softmmu/vl.c +++ b/softmmu/vl.c @@ -112,6 +112,7 @@ #include "qapi/qmp/qerror.h" #include "sysemu/iothread.h" #include "qemu/guest-random.h" +#include "net/colo-compare.h" #define MAX_VIRTIO_CONSOLES 1 @@ -2906,6 +2907,7 @@ void qemu_init(int argc, char **argv, char **envp) precopy_infrastructure_init(); postcopy_infrastructure_init(); monitor_init_globals(); + colo_compare_init_globals(); if (qcrypto_init(&err) < 0) { error_reportf_err(err, "cannot initialize crypto: "); From patchwork Sun Apr 26 19:25:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Straub X-Patchwork-Id: 283926 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E6284C54FCB for ; 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Sun, 26 Apr 2020 21:25:59 +0200 Date: Sun, 26 Apr 2020 21:25:58 +0200 From: Lukas Straub To: qemu-devel Subject: [PATCH v2 6/6] net/colo-compare.c: Correct ordering in complete and finalize Message-ID: <1f8588fc862c9a96006239f82431775c60953250.1587927878.git.lukasstraub2@web.de> In-Reply-To: References: MIME-Version: 1.0 X-Provags-ID: V03:K1:eMORE7rslF06fO7KdwJI3wW43+RE9wizYdPzOVgtGkBOpY7IajJ jBh4Hl+mvToQseJbBIY0qpRePwdwqRvYahar9WqJOQ9tFJON//CfrvReo1u6jvNkluT6cMP 3mETCRew66Mq+g/AnXp2DBW/GiSf4HWVLRJs++aZ46zAqhSdFz1tl4Hz2hXjbs6EC4NAhw9 izBHf52mMs4UjcfjZkX7Q== X-UI-Out-Filterresults: notjunk:1; V03:K0:gwtfQ+v7ngE=:BIyVkOdN8xUVlFFcbHxhR+ 6i2LgrpWI1LkyhYfi57QM7H0bnlF+kZ6rGnQacKdG4Mr2dEzcvE4y/KMZoOBwt51bRlp9Hpw4 YB3IQ+FhdBSlZxnHUGeakdiSnw7gQQwYieku/k50KcCtHx9IYo2LCVm4FASqNkOMfa6I+0IAy d6KTHpFSmn5awGGqjljk7/WfOu7YGEXRZXGCgb0BtqePSapG8FsJjsZmDNrGkIShQOawvINpI YMQ3xQAf1QDBnFoWAc9LHgvHnh5omK288XBB1FhZAl4vfZ/Ov9UWQgxJLhCxDHbh5VZe+/2bw cOllSNtOFnkCdTc3Ky42JnBCvaIOh4z2Ka9pTCf/YU3yLWrd+8vuwwGEIr7H+Xn+QnRtOkaoW f27++BjM+wpJmUF9TpmQxK3Ift94T27g45uE8Y6jX9VdV5/Pd3A3KNKUqxTIYoP54BkWn9Kd4 wRAGpzrUd31zL0kCD1kVQBdst71412siMXA1uqXpBYGSTIEdB5Nzalf2tlzO1XG03Pwe/ny2d zmLKIHN2OZIOL+YSvf8msrgBwJmxHMVsLQeZFClW7Fbyh/f5DaMlfedx9W5fTXkX6zVwTrIRK hgksOhKcy2V/9P9wrkzH/yWNbJL1jOd2sTkmqWYqH8tBeBth8kZgdEEyTF3uB/R0F6vvwZ6qM TCYspUJwsMPB6u3uiMw+FrkC/G1IpLUQf6ykhkUFPAAYJt9QsrEw6vHrhOl2PnFA8LjC+4P1e XDTK6vvnQiLbNV8Q0WH32vx5i3mDty1wifvcEVKTbvtE/HSvPOZ/Af2xkeusvduTvdVBzbsbx keRutN6XAlKQ6q9ctqjH/YeCN5tGPV2D+Jq95fSLu0R74nscWKeYqM2n0iwwZzsRrMbvHZ016 6zI+oTbNOVx/xywbuMGuwThJBWDZI3oHI5bf+MWLqwLyEtz4w56zO4HgLjK0owg2uFcAs512U HwvBfcOyc/XP4Rhj9a9OY7XfKxKWEWvcaZofSrDKAr9e2gDne5jG7ZHLMv7XQnJ+aH5avzZhx sR/dE4gkqfUJYFR6O2WJfHuBF/A2545bQlaGmWmxVYwkHIGZn/1NGVgbn6xN9pLc57qu9P18v yjtkfcuF71vPSvnBSbRbmlNqEC1FohbTxvZvUWjBCa6FThTcPJ8rNRZTUMEvJSImDQ+vsp7Mn 93cTjSRE4VKszu/X6AhU0vYNeMBPgUepbBexe017e8QwJA7TiMfa5Xrd7mKgtPDOECBhJ2Ho/ g+NY+s5OeuH7MRGtB Received-SPF: pass client-ip=212.227.15.14; envelope-from=lukasstraub2@web.de; helo=mout.web.de X-detected-operating-system: by eggs.gnu.org: First seen = 2020/04/26 15:26:03 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Received-From: 212.227.15.14 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: Zhang Chen , Jason Wang , Paolo Bonzini , Li Zhijian , =?utf-8?q?Marc-Andr=C3=A9?= Lureau Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" In colo_compare_complete, insert CompareState into net_compares only after everything has been initialized. In colo_compare_finalize, remove CompareState from net_compares before anything is deinitialized. Signed-off-by: Lukas Straub --- net/colo-compare.c | 47 +++++++++++++++++++++++----------------------- 1 file changed, 24 insertions(+), 23 deletions(-) diff --git a/net/colo-compare.c b/net/colo-compare.c index a82bb27a67..53cc145a84 100644 --- a/net/colo-compare.c +++ b/net/colo-compare.c @@ -1287,15 +1287,6 @@ static void colo_compare_complete(UserCreatable *uc, Error **errp) s->vnet_hdr); } - qemu_mutex_lock(&colo_compare_mutex); - if (!colo_compare_active) { - qemu_mutex_init(&event_mtx); - qemu_cond_init(&event_complete_cond); - colo_compare_active = true; - } - QTAILQ_INSERT_TAIL(&net_compares, s, next); - qemu_mutex_unlock(&colo_compare_mutex); - s->sendco.done = true; g_queue_init(&s->sendco.send_list); @@ -1307,6 +1298,16 @@ static void colo_compare_complete(UserCreatable *uc, Error **errp) connection_destroy); colo_compare_iothread(s); + + qemu_mutex_lock(&colo_compare_mutex); + if (!colo_compare_active) { + qemu_mutex_init(&event_mtx); + qemu_cond_init(&event_complete_cond); + colo_compare_active = true; + } + QTAILQ_INSERT_TAIL(&net_compares, s, next); + qemu_mutex_unlock(&colo_compare_mutex); + return; } @@ -1377,6 +1378,20 @@ static void colo_compare_finalize(Object *obj) CompareState *s = COLO_COMPARE(obj); CompareState *tmp = NULL; + qemu_mutex_lock(&colo_compare_mutex); + QTAILQ_FOREACH(tmp, &net_compares, next) { + if (tmp == s) { + QTAILQ_REMOVE(&net_compares, s, next); + break; + } + } + if (QTAILQ_EMPTY(&net_compares)) { + colo_compare_active = false; + qemu_mutex_destroy(&event_mtx); + qemu_cond_destroy(&event_complete_cond); + } + qemu_mutex_unlock(&colo_compare_mutex); + AioContext *ctx = iothread_get_aio_context(s->iothread); aio_context_acquire(ctx); AIO_WAIT_WHILE(ctx, !s->sendco.done); @@ -1395,20 +1410,6 @@ static void colo_compare_finalize(Object *obj) qemu_bh_delete(s->event_bh); - qemu_mutex_lock(&colo_compare_mutex); - QTAILQ_FOREACH(tmp, &net_compares, next) { - if (tmp == s) { - QTAILQ_REMOVE(&net_compares, s, next); - break; - } - } - if (QTAILQ_EMPTY(&net_compares)) { - colo_compare_active = false; - qemu_mutex_destroy(&event_mtx); - qemu_cond_destroy(&event_complete_cond); - } - qemu_mutex_unlock(&colo_compare_mutex); - /* Release all unhandled packets after compare thead exited */ g_queue_foreach(&s->conn_list, colo_flush_packets, s);