From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60553) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e4sKm-0005eN-JP for qemu-devel@nongnu.org; Wed, 18 Oct 2017 13:40:49 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e4sKk-0001oM-TZ for qemu-devel@nongnu.org; Wed, 18 Oct 2017 13:40:48 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49168) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1e4sKk-0001mr-LG for qemu-devel@nongnu.org; Wed, 18 Oct 2017 13:40:46 -0400 From: "Dr. David Alan Gilbert (git)" Date: Wed, 18 Oct 2017 18:40:13 +0100 Message-Id: <20171018174013.22709-8-dgilbert@redhat.com> In-Reply-To: <20171018174013.22709-1-dgilbert@redhat.com> References: <20171018174013.22709-1-dgilbert@redhat.com> Subject: [Qemu-devel] [PATCH v3 7/7] migration: pause-before-switchover for postcopy List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, kwolf@redhat.com, jdenemar@redhat.com, wangjie88@huawei.com, quintela@redhat.com, peterx@redhat.com, mreitz@redhat.com Cc: berrange@redhat.com, eblake@redhat.com, fuweiwei2@huawei.com From: "Dr. David Alan Gilbert" Add pause-before-switchover support for postcopy. After starting postcopy it will transition active->pre-switchover->postcopy_active Signed-off-by: Dr. David Alan Gilbert --- migration/migration.c | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) diff --git a/migration/migration.c b/migration/migration.c index 756deb3e2c..af587377e9 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -104,6 +104,9 @@ enum mig_rp_message_type { static MigrationState *current_migration; static bool migration_object_check(MigrationState *ms, Error **errp); +static int migration_maybe_pause(MigrationState *s, + int *current_active_state, + int new_state); void migration_object_init(void) { @@ -1830,8 +1833,11 @@ static int postcopy_start(MigrationState *ms, bool *old_vm_running) QEMUFile *fb; int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); bool restart_block = false; - migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE, - MIGRATION_STATUS_POSTCOPY_ACTIVE); + int cur_state = MIGRATION_STATUS_ACTIVE; + if (!migrate_pause_before_switchover()) { + migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE, + MIGRATION_STATUS_POSTCOPY_ACTIVE); + } trace_postcopy_start(); qemu_mutex_lock_iothread(); @@ -1845,6 +1851,12 @@ static int postcopy_start(MigrationState *ms, bool *old_vm_running) goto fail; } + ret = migration_maybe_pause(ms, &cur_state, + MIGRATION_STATUS_POSTCOPY_ACTIVE); + if (ret < 0) { + goto fail; + } + ret = bdrv_inactivate_all(); if (ret < 0) { goto fail; @@ -1987,7 +1999,9 @@ fail: * migrate_pause_before_switchover called with the iothread locked * Returns: 0 on success */ -static int migration_maybe_pause(MigrationState *s, int *current_active_state) +static int migration_maybe_pause(MigrationState *s, + int *current_active_state, + int new_state) { if (!migrate_pause_before_switchover()) { return 0; @@ -2008,11 +2022,11 @@ static int migration_maybe_pause(MigrationState *s, int *current_active_state) MIGRATION_STATUS_PRE_SWITCHOVER); qemu_sem_wait(&s->pause_sem); migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER, - MIGRATION_STATUS_DEVICE); - *current_active_state = MIGRATION_STATUS_DEVICE; + new_state); + *current_active_state = new_state; qemu_mutex_lock_iothread(); - return s->state == MIGRATION_STATUS_DEVICE ? 0 : -EINVAL; + return s->state == new_state ? 0 : -EINVAL; } /** @@ -2041,7 +2055,8 @@ static void migration_completion(MigrationState *s, int current_active_state, bool inactivate = !migrate_colo_enabled(); ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); if (ret >= 0) { - ret = migration_maybe_pause(s, ¤t_active_state); + ret = migration_maybe_pause(s, ¤t_active_state, + MIGRATION_STATUS_DEVICE); } if (ret >= 0) { qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX); -- 2.13.6