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Thu, 31 Aug 2023 05:57:10 -0700 From: Avihai Horon To: CC: Alex Williamson , =?utf-8?q?C=C3=A9dric_Le_G?= =?utf-8?q?oater?= , Juan Quintela , Peter Xu , Leonardo Bras , Yanghang Liu , Avihai Horon Subject: [PATCH v2 3/5] migration: Add .save_prepare() handler to struct SaveVMHandlers Date: Thu, 31 Aug 2023 15:57:00 +0300 Message-ID: <20230831125702.11263-4-avihaih@nvidia.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20230831125702.11263-1-avihaih@nvidia.com> References: <20230831125702.11263-1-avihaih@nvidia.com> MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000044FA:EE_|DM4PR12MB8452:EE_ X-MS-Office365-Filtering-Correlation-Id: b08c8a93-b841-4d8c-ede2-08dbaa21d29a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160; 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envelope-from=avihaih@nvidia.com; helo=NAM12-MW2-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, SPF_HELO_PASS=-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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Add a new .save_prepare() handler to struct SaveVMHandlers. This handler is called early, even before migration starts, and can be used by devices to perform early checks. Suggested-by: Peter Xu Signed-off-by: Avihai Horon Reviewed-by: Peter Xu Reviewed-by: Cédric Le Goater --- include/migration/register.h | 5 +++++ migration/savevm.h | 1 + migration/migration.c | 4 ++++ migration/savevm.c | 29 +++++++++++++++++++++++++++++ 4 files changed, 39 insertions(+) diff --git a/include/migration/register.h b/include/migration/register.h index 90914f32f5..2b12c6adec 100644 --- a/include/migration/register.h +++ b/include/migration/register.h @@ -20,6 +20,11 @@ typedef struct SaveVMHandlers { /* This runs inside the iothread lock. */ SaveStateHandler *save_state; + /* + * save_prepare is called early, even before migration starts, and can be + * used to perform early checks. + */ + int (*save_prepare)(void *opaque, Error **errp); void (*save_cleanup)(void *opaque); int (*save_live_complete_postcopy)(QEMUFile *f, void *opaque); int (*save_live_complete_precopy)(QEMUFile *f, void *opaque); diff --git a/migration/savevm.h b/migration/savevm.h index e894bbc143..74669733dd 100644 --- a/migration/savevm.h +++ b/migration/savevm.h @@ -31,6 +31,7 @@ bool qemu_savevm_state_blocked(Error **errp); void qemu_savevm_non_migratable_list(strList **reasons); +int qemu_savevm_state_prepare(Error **errp); void qemu_savevm_state_setup(QEMUFile *f); bool qemu_savevm_state_guest_unplug_pending(void); int qemu_savevm_state_resume_prepare(MigrationState *s); diff --git a/migration/migration.c b/migration/migration.c index 92866a8f49..914783f07b 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -1634,6 +1634,10 @@ static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc, migrate_set_block_incremental(true); } + if (qemu_savevm_state_prepare(errp)) { + return false; + } + migrate_init(s); /* * set mig_stats compression_counters memory to zero for a diff --git a/migration/savevm.c b/migration/savevm.c index 5bf8b59a7d..818510ec57 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -1233,6 +1233,30 @@ bool qemu_savevm_state_guest_unplug_pending(void) return false; } +int qemu_savevm_state_prepare(Error **errp) +{ + SaveStateEntry *se; + int ret; + + QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { + if (!se->ops || !se->ops->save_prepare) { + continue; + } + if (se->ops->is_active) { + if (!se->ops->is_active(se->opaque)) { + continue; + } + } + + ret = se->ops->save_prepare(se->opaque, errp); + if (ret < 0) { + return ret; + } + } + + return 0; +} + void qemu_savevm_state_setup(QEMUFile *f) { MigrationState *ms = migrate_get_current(); @@ -1619,6 +1643,11 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp) return -EINVAL; } + ret = qemu_savevm_state_prepare(errp); + if (ret) { + return ret; + } + migrate_init(ms); memset(&mig_stats, 0, sizeof(mig_stats)); memset(&compression_counters, 0, sizeof(compression_counters));