From patchwork Wed Dec 18 09:14:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Liu, Yuan1" X-Patchwork-Id: 13913225 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 46A0BE7718A for ; Wed, 18 Dec 2024 09:15:38 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tNq8T-0006Yy-Ab; Wed, 18 Dec 2024 04:14:29 -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 1tNq8R-0006Y6-7j for qemu-devel@nongnu.org; Wed, 18 Dec 2024 04:14:27 -0500 Received: from mgamail.intel.com ([192.198.163.13]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tNq8P-0001mR-2o for qemu-devel@nongnu.org; Wed, 18 Dec 2024 04:14:26 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1734513265; x=1766049265; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=VhK6YJCxy3UNdY56dm9LpsnVCa7MhAkw47y80bUy74U=; b=YOX4+En+aGoBoj0jB96BPTx+E5qeVU25kLvkfc8PT3YSqQrIIZMqGzXp ONWo44mFKRJl9yaynB/5ummmRYOIJoXBu0MvC+Pbikh3tWqKM1flN4Whp EcP/66QkO4ldEzgot7EOOg8Mkj5Q9FOiOt7wPvijzo/9Hm8KUKJKzBo6b wEkuY8DK3WJPgtIhQ9YuBypvGoR+QkFtDNKmLgrx2ScTKcrNt0q/K5f7b BmjSuPEjc4dTEFaLkys2HD1bTb9vRQoBZWYy49qKeSoBvMcWBeljH0Nox PjRWTjbqR3nEkjSxpRKIGWuM76Z0i82EWbhAE8yWtIjA8fjd9AAiggqkR A==; X-CSE-ConnectionGUID: mouUqFitQUiVJz4mjcy/5w== X-CSE-MsgGUID: AemB7ed9RcaAAl0XzgY6ug== X-IronPort-AV: E=McAfee;i="6700,10204,11289"; a="37815600" X-IronPort-AV: E=Sophos;i="6.12,244,1728975600"; d="scan'208";a="37815600" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Dec 2024 01:14:18 -0800 X-CSE-ConnectionGUID: mdKrFj6XToKvQIOU6dUTqg== X-CSE-MsgGUID: 7PxwsLOQRpetzpbqHhFP5w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="121066394" Received: from sae-gw02.sh.intel.com (HELO localhost) ([10.239.45.110]) by fmviesa002.fm.intel.com with ESMTP; 18 Dec 2024 01:14:16 -0800 From: Yuan Liu To: peterx@redhat.com, farosas@suse.de Cc: qemu-devel@nongnu.org, yuan1.liu@intel.com, jason.zeng@intel.com, yichen.wang@bytedance.com Subject: [PATCH 1/3] multifd: bugfix for migration using compression methods Date: Wed, 18 Dec 2024 17:14:11 +0800 Message-ID: <20241218091413.140396-2-yuan1.liu@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241218091413.140396-1-yuan1.liu@intel.com> References: <20241218091413.140396-1-yuan1.liu@intel.com> MIME-Version: 1.0 Received-SPF: pass client-ip=192.198.163.13; envelope-from=yuan1.liu@intel.com; helo=mgamail.intel.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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: 2.1.29 Precedence: list List-Id: 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 When compression is enabled on the migration channel and the pages processed are all zero pages, these pages will not be sent and updated on the target side, resulting in incorrect memory data on the source and target sides. The root cause is that all compression methods call multifd_send_prepare_common to determine whether to compress dirty pages, but multifd_send_prepare_common does not update the IOV of MultiFDPacket_t when all dirty pages are zero pages. The solution is to always update the IOV of MultiFDPacket_t regardless of whether the dirty pages are all zero pages. Signed-off-by: Yuan Liu Reviewed-by: Jason Zeng Reviewed-by: Peter Xu --- migration/multifd-nocomp.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/migration/multifd-nocomp.c b/migration/multifd-nocomp.c index 55191152f9..2e4aaac285 100644 --- a/migration/multifd-nocomp.c +++ b/migration/multifd-nocomp.c @@ -362,6 +362,7 @@ int multifd_ram_flush_and_sync(void) bool multifd_send_prepare_common(MultiFDSendParams *p) { MultiFDPages_t *pages = &p->data->u.ram; + multifd_send_prepare_header(p); multifd_send_zero_page_detect(p); if (!pages->normal_num) { @@ -369,8 +370,6 @@ bool multifd_send_prepare_common(MultiFDSendParams *p) return false; } - multifd_send_prepare_header(p); - return true; }