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 61EA9CD4F52 for ; Mon, 18 May 2026 10:52:54 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1wOvaS-0003rX-AC; Mon, 18 May 2026 06:52:40 -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 1wOvaF-0003pZ-8i for qemu-devel@nongnu.org; Mon, 18 May 2026 06:52:27 -0400 Received: from out30-97.freemail.mail.aliyun.com ([115.124.30.97]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wOvaA-0000sD-QT for qemu-devel@nongnu.org; Mon, 18 May 2026 06:52:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1779101523; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=yiOq06laJ9OAIKjKUpt4VDwPVBagTZHRhpc52CFfiVU=; b=SUn0IauMOenirmzL/WHsjs7ZJdyIt3sHUbSQQrACRHsUPVOcoNMTp2iDExQc7udVVuWWHgh6E/12Z6gtbwrTbpX2vMKJ64Z5dFGAf8LhS787B90Ck7knvbO9Q6VT2r6zPZPuLS2r6WzSKz6rEsVmeR5QLZ36nhG9NZ1Tvpwpt2g= X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R881e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=maildocker-contentspam033045098064; MF=guobin@linux.alibaba.com; NM=1; PH=DS; RN=3; SR=0; TI=SMTPD_---0X37tYzb_1779101516; Received: from localhost(mailfrom:guobin@linux.alibaba.com fp:SMTPD_---0X37tYzb_1779101516 cluster:ay36) by smtp.aliyun-inc.com; Mon, 18 May 2026 18:52:02 +0800 From: Bin Guo To: qemu-devel@nongnu.org Cc: peterx@redhat.com, farosas@suse.de Subject: [PATCH 0/8] migration: cleanups, fixes and micro-optimizations Date: Mon, 18 May 2026 18:51:47 +0800 Message-ID: <20260518105156.17626-1-guobin@linux.alibaba.com> X-Mailer: git-send-email 2.50.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=115.124.30.97; envelope-from=guobin@linux.alibaba.com; helo=out30-97.freemail.mail.aliyun.com X-Spam_score_int: -174 X-Spam_score: -17.5 X-Spam_bar: ----------------- X-Spam_report: (-17.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5 autolearn=ham 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 This series collects several small improvements to the migration subsystem: - Bug fix: off-by-one in multifd recv channel ID validation that could allow an out-of-bounds write (patch 5). - Micro-optimizations: cache migrate_multifd_channels() in hot paths (patches 7-8), use stack-allocated bitmap instead of heap (patch 4), avoid per-element heap churn in vmstate ptr marker field (patch 3). - Cleanups: collapse migration_fd_valid into a single boolean expression (patch 1), replace strcpy("") with explicit NUL termination (patch 2), merge thread-join and cleanup loops in multifd_recv_cleanup (patch 6). No functional change intended except for the off-by-one fix in patch 5. Bin Guo (8): migration/fd: collapse migration_fd_valid into single boolean expression migration/global_state: replace strcpy("") with explicit NUL termination migration/vmstate: avoid per-element heap churn in vmsd ptr marker field migration/savevm: use stack-allocated bitmap in configuration_validate_capabilities migration/multifd: fix off-by-one in recv channel ID validation migration/multifd: merge thread-join and cleanup loops in multifd_recv_cleanup migration/multifd: cache migrate_multifd_channels() in send/recv hot paths migration/multifd: cache channel count in multifd_send_sync_main migration/fd.c | 10 +--------- migration/global_state.c | 2 +- migration/multifd.c | 32 +++++++++++++++++-------------- migration/savevm.c | 5 ++--- migration/vmstate.c | 41 ++++++++++++++++------------------------ 5 files changed, 38 insertions(+), 52 deletions(-) -- 2.50.1 (Apple Git-155)