From patchwork Tue Aug 27 17:54:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Maciej S. Szmigiero" X-Patchwork-Id: 13779939 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 E3D69C54731 for ; Tue, 27 Aug 2024 17:57:56 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sj0Q2-0005dX-RH; Tue, 27 Aug 2024 13:55:50 -0400 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 1sj0Px-0005FC-21 for qemu-devel@nongnu.org; Tue, 27 Aug 2024 13:55:45 -0400 Received: from vps-vb.mhejs.net ([37.28.154.113]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sj0Pr-0001Zm-Q9 for qemu-devel@nongnu.org; Tue, 27 Aug 2024 13:55:44 -0400 Received: from MUA by vps-vb.mhejs.net with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1sj0Pc-0002Ml-VW; Tue, 27 Aug 2024 19:55:25 +0200 From: "Maciej S. Szmigiero" To: Peter Xu , Fabiano Rosas Cc: Alex Williamson , =?utf-8?q?C=C3=A9dric_Le_G?= =?utf-8?q?oater?= , Eric Blake , Markus Armbruster , =?utf-8?q?Daniel_P_=2E_Berrang=C3=A9?= , Avihai Horon , Joao Martins , qemu-devel@nongnu.org Subject: [PATCH v2 06/17] migration: Add save_live_complete_precopy_{begin, end} handlers Date: Tue, 27 Aug 2024 19:54:25 +0200 Message-ID: X-Mailer: git-send-email 2.45.2 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=37.28.154.113; envelope-from=mail@maciej.szmigiero.name; helo=vps-vb.mhejs.net X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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 From: "Maciej S. Szmigiero" These SaveVMHandlers help device provide its own asynchronous transmission of the remaining data at the end of a precopy phase. In this use case the save_live_complete_precopy_begin handler might be used to mark the stream boundary before proceeding with asynchronous transmission of the remaining data while the save_live_complete_precopy_end handler might be used to mark the stream boundary after performing the asynchronous transmission. Signed-off-by: Maciej S. Szmigiero Reviewed-by: Fabiano Rosas --- include/migration/register.h | 36 ++++++++++++++++++++++++++++++++++++ migration/savevm.c | 35 +++++++++++++++++++++++++++++++++++ 2 files changed, 71 insertions(+) diff --git a/include/migration/register.h b/include/migration/register.h index f60e797894e5..9de123252edf 100644 --- a/include/migration/register.h +++ b/include/migration/register.h @@ -103,6 +103,42 @@ typedef struct SaveVMHandlers { */ int (*save_live_complete_precopy)(QEMUFile *f, void *opaque); + /** + * @save_live_complete_precopy_begin + * + * Called at the end of a precopy phase, before all + * @save_live_complete_precopy handlers and before launching + * all @save_live_complete_precopy_thread threads. + * The handler might, for example, mark the stream boundary before + * proceeding with asynchronous transmission of the remaining data via + * @save_live_complete_precopy_thread. + * When postcopy is enabled, devices that support postcopy will skip this step. + * + * @f: QEMUFile where the handler can synchronously send data before returning + * @idstr: this device section idstr + * @instance_id: this device section instance_id + * @opaque: data pointer passed to register_savevm_live() + * + * Returns zero to indicate success and negative for error + */ + int (*save_live_complete_precopy_begin)(QEMUFile *f, + char *idstr, uint32_t instance_id, + void *opaque); + /** + * @save_live_complete_precopy_end + * + * Called at the end of a precopy phase, after @save_live_complete_precopy + * handlers and after all @save_live_complete_precopy_thread threads have + * finished. When postcopy is enabled, devices that support postcopy will + * skip this step. + * + * @f: QEMUFile where the handler can synchronously send data before returning + * @opaque: data pointer passed to register_savevm_live() + * + * Returns zero to indicate success and negative for error + */ + int (*save_live_complete_precopy_end)(QEMUFile *f, void *opaque); + /* This runs both outside and inside the BQL. */ /** diff --git a/migration/savevm.c b/migration/savevm.c index 6bb404b9c86f..d43acbbf20cf 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -1496,6 +1496,27 @@ int qemu_savevm_state_complete_precopy_iterable(QEMUFile *f, bool in_postcopy) SaveStateEntry *se; int ret; + QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { + if (!se->ops || (in_postcopy && se->ops->has_postcopy && + se->ops->has_postcopy(se->opaque)) || + !se->ops->save_live_complete_precopy_begin) { + continue; + } + + save_section_header(f, se, QEMU_VM_SECTION_END); + + ret = se->ops->save_live_complete_precopy_begin(f, + se->idstr, se->instance_id, + se->opaque); + + save_section_footer(f, se); + + if (ret < 0) { + qemu_file_set_error(f, ret); + return -1; + } + } + QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { if (!se->ops || (in_postcopy && se->ops->has_postcopy && @@ -1527,6 +1548,20 @@ int qemu_savevm_state_complete_precopy_iterable(QEMUFile *f, bool in_postcopy) end_ts_each - start_ts_each); } + QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { + if (!se->ops || (in_postcopy && se->ops->has_postcopy && + se->ops->has_postcopy(se->opaque)) || + !se->ops->save_live_complete_precopy_end) { + continue; + } + + ret = se->ops->save_live_complete_precopy_end(f, se->opaque); + if (ret < 0) { + qemu_file_set_error(f, ret); + return -1; + } + } + trace_vmstate_downtime_checkpoint("src-iterable-saved"); return 0;