From bfbf89c2b524670edbf71e12fc5bc1b34d925211 Mon Sep 17 00:00:00 2001 From: Peter Xu Date: Wed, 2 May 2018 18:47:39 +0800 Subject: migration/qmp: add command migrate-pause It pauses an ongoing migration. Currently it only supports postcopy. Note that this command will work on either side of the migration. Basically when we trigger this on one side, it'll interrupt the other side as well since the other side will get notified on the disconnect event. However, it's still possible that the other side is not notified, for example, when the network is totally broken, or due to some firewall configuration changes. In that case, we will also need to run the same command on the other side so both sides will go into the paused state. Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Peter Xu Message-Id: <20180502104740.12123-24-peterx@redhat.com> Signed-off-by: Juan Quintela --- s/2.12/2.13/ --- migration/migration.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'migration/migration.c') diff --git a/migration/migration.c b/migration/migration.c index 3deded90e5..05aec2c905 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -1507,6 +1507,35 @@ void qmp_migrate_recover(const char *uri, Error **errp) qemu_start_incoming_migration(uri, errp); } +void qmp_migrate_pause(Error **errp) +{ + MigrationState *ms = migrate_get_current(); + MigrationIncomingState *mis = migration_incoming_get_current(); + int ret; + + if (ms->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { + /* Source side, during postcopy */ + qemu_mutex_lock(&ms->qemu_file_lock); + ret = qemu_file_shutdown(ms->to_dst_file); + qemu_mutex_unlock(&ms->qemu_file_lock); + if (ret) { + error_setg(errp, "Failed to pause source migration"); + } + return; + } + + if (mis->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { + ret = qemu_file_shutdown(mis->from_src_file); + if (ret) { + error_setg(errp, "Failed to pause destination migration"); + } + return; + } + + error_setg(errp, "migrate-pause is currently only supported " + "during postcopy-active state"); +} + bool migration_is_blocked(Error **errp) { if (qemu_savevm_state_blocked(errp)) { -- cgit v1.2.3