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Wed, 6 Sep 2023 08:09:05 -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 v3 4/6] migration: Add .save_prepare() handler to struct SaveVMHandlers Date: Wed, 6 Sep 2023 18:08:51 +0300 Message-ID: <20230906150853.22176-5-avihaih@nvidia.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20230906150853.22176-1-avihaih@nvidia.com> References: <20230906150853.22176-1-avihaih@nvidia.com> MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PEPF0000343B:EE_|SJ2PR12MB8954:EE_ X-MS-Office365-Filtering-Correlation-Id: 8387acc2-48f9-44a1-9ce2-08dbaeeb3d8b 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=NAM10-BN7-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. Refactor migrate_init() to be able to return errors and call .save_prepare() from there. Suggested-by: Peter Xu Signed-off-by: Avihai Horon Reviewed-by: Peter Xu Reviewed-by: Cédric Le Goater --- include/migration/register.h | 5 +++++ migration/migration.h | 2 +- migration/savevm.h | 1 + migration/migration.c | 15 +++++++++++++-- migration/savevm.c | 29 ++++++++++++++++++++++++++++- 5 files changed, 48 insertions(+), 4 deletions(-) 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/migration.h b/migration/migration.h index c5695de214..c390500604 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -472,7 +472,7 @@ void migrate_fd_connect(MigrationState *s, Error *error_in); bool migration_is_setup_or_active(int state); bool migration_is_running(int state); -void migrate_init(MigrationState *s); +int migrate_init(MigrationState *s, Error **errp); bool migration_is_blocked(Error **errp); /* True if outgoing migration has entered postcopy phase */ bool migration_in_postcopy(void); 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 ce01a3ba6a..d61e572742 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -1392,8 +1392,15 @@ bool migration_is_active(MigrationState *s) s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); } -void migrate_init(MigrationState *s) +int migrate_init(MigrationState *s, Error **errp) { + int ret; + + ret = qemu_savevm_state_prepare(errp); + if (ret) { + return ret; + } + /* * Reinitialise all migration state, except * parameters/capabilities that the user set, and @@ -1432,6 +1439,8 @@ void migrate_init(MigrationState *s) memset(&mig_stats, 0, sizeof(mig_stats)); memset(&compression_counters, 0, sizeof(compression_counters)); migration_reset_vfio_bytes_transferred(); + + return 0; } int migrate_add_blocker_internal(Error *reason, Error **errp) @@ -1641,7 +1650,9 @@ static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc, migrate_set_block_incremental(true); } - migrate_init(s); + if (migrate_init(s, errp)) { + return false; + } return true; } diff --git a/migration/savevm.c b/migration/savevm.c index e14efeced0..bb3e99194c 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(); @@ -1619,7 +1643,10 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp) return -EINVAL; } - migrate_init(ms); + ret = migrate_init(ms, errp); + if (ret) { + return ret; + } ms->to_dst_file = f; qemu_mutex_unlock_iothread();