From nobody Sat Nov 23 20:06:11 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1731871422163826.9078056873387; Sun, 17 Nov 2024 11:23:42 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tCkqb-0002of-0k; Sun, 17 Nov 2024 14:22:13 -0500 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 1tCkqZ-0002n6-3t for qemu-devel@nongnu.org; Sun, 17 Nov 2024 14:22:11 -0500 Received: from vps-ovh.mhejs.net ([145.239.82.108]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tCkqX-0005v6-C3 for qemu-devel@nongnu.org; Sun, 17 Nov 2024 14:22:10 -0500 Received: from MUA by vps-ovh.mhejs.net with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.98) (envelope-from ) id 1tCkqT-00000002GUa-1ZLK; Sun, 17 Nov 2024 20:22:05 +0100 From: "Maciej S. Szmigiero" To: Peter Xu , Fabiano Rosas Cc: Alex Williamson , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Eric Blake , Markus Armbruster , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , Avihai Horon , Joao Martins , qemu-devel@nongnu.org Subject: [PATCH v3 11/24] migration/multifd: Make multifd_send() thread safe Date: Sun, 17 Nov 2024 20:20:06 +0100 Message-ID: <20fadbcc46cc7cc698ce24e83a3e0fc0c35cd2d8.1731773021.git.maciej.szmigiero@oracle.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=lists.gnu.org; Received-SPF: none client-ip=145.239.82.108; envelope-from=mhej@vps-ovh.mhejs.net; helo=vps-ovh.mhejs.net X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_NONE=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: 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-ZM-MESSAGEID: 1731871424253116600 Content-Type: text/plain; charset="utf-8" From: "Maciej S. Szmigiero" multifd_send() function is currently not thread safe, make it thread safe by holding a lock during its execution. This way it will be possible to safely call it concurrently from multiple threads. Signed-off-by: Maciej S. Szmigiero --- migration/multifd.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/migration/multifd.c b/migration/multifd.c index 9578a985449b..4575495c8816 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -50,6 +50,10 @@ typedef struct { =20 struct { MultiFDSendParams *params; + + /* multifd_send() body is not thread safe, needs serialization */ + QemuMutex multifd_send_mutex; + /* * Global number of generated multifd packets. * @@ -331,6 +335,7 @@ static void multifd_send_kick_main(MultiFDSendParams *p) */ bool multifd_send(MultiFDSendData **send_data) { + QEMU_LOCK_GUARD(&multifd_send_state->multifd_send_mutex); int i; static int next_channel; MultiFDSendParams *p =3D NULL; /* make happy gcc */ @@ -508,6 +513,7 @@ static void multifd_send_cleanup_state(void) socket_cleanup_outgoing_migration(); qemu_sem_destroy(&multifd_send_state->channels_created); qemu_sem_destroy(&multifd_send_state->channels_ready); + qemu_mutex_destroy(&multifd_send_state->multifd_send_mutex); g_free(multifd_send_state->params); multifd_send_state->params =3D NULL; g_free(multifd_send_state); @@ -853,6 +859,7 @@ bool multifd_send_setup(void) thread_count =3D migrate_multifd_channels(); multifd_send_state =3D g_malloc0(sizeof(*multifd_send_state)); multifd_send_state->params =3D g_new0(MultiFDSendParams, thread_count); + qemu_mutex_init(&multifd_send_state->multifd_send_mutex); qemu_sem_init(&multifd_send_state->channels_created, 0); qemu_sem_init(&multifd_send_state->channels_ready, 0); qatomic_set(&multifd_send_state->exiting, 0);