migration: MigrationEvent for notifiers
Passing MigrationState to notifiers is unsound because they could access unstable migration state internals or even modify the state. Instead, pass the minimal info needed in a new MigrationEvent struct, which could be extended in the future if needed. Suggested-by: Peter Xu <peterx@redhat.com> Signed-off-by: Steve Sistare <steven.sistare@oracle.com> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Link: https://lore.kernel.org/r/1708622920-68779-5-git-send-email-steven.sistare@oracle.com Signed-off-by: Peter Xu <peterx@redhat.com>
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@ -3504,7 +3504,7 @@ out:
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return !err;
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}
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static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationState *s)
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static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationEvent *e)
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{
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bool should_be_hidden;
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Error *err = NULL;
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@ -3516,7 +3516,7 @@ static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationState *s)
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should_be_hidden = qatomic_read(&n->failover_primary_hidden);
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if (migration_in_setup(s) && !should_be_hidden) {
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if (e->type == MIG_EVENT_PRECOPY_SETUP && !should_be_hidden) {
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if (failover_unplug_primary(n, dev)) {
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vmstate_unregister(VMSTATE_IF(dev), qdev_get_vmsd(dev), dev);
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qapi_event_send_unplug_primary(dev->id);
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@ -3524,7 +3524,7 @@ static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationState *s)
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} else {
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warn_report("couldn't unplug primary device");
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}
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} else if (migration_has_failed(s)) {
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} else if (e->type == MIG_EVENT_PRECOPY_FAILED) {
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/* We already unplugged the device let's plug it back */
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if (!failover_replug_primary(n, dev, &err)) {
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if (err) {
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@ -3537,9 +3537,10 @@ static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationState *s)
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static int virtio_net_migration_state_notifier(NotifierWithReturn *notifier,
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void *data, Error **errp)
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{
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MigrationState *s = data;
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MigrationEvent *e = data;
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VirtIONet *n = container_of(notifier, VirtIONet, migration_state);
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virtio_net_handle_migration_primary(n, s);
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virtio_net_handle_migration_primary(n, e);
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return 0;
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}
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@ -757,18 +757,14 @@ static void vfio_vmstate_change(void *opaque, bool running, RunState state)
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static int vfio_migration_state_notifier(NotifierWithReturn *notifier,
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void *data, Error **errp)
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{
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MigrationState *s = data;
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MigrationEvent *e = data;
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VFIOMigration *migration = container_of(notifier, VFIOMigration,
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migration_state);
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VFIODevice *vbasedev = migration->vbasedev;
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trace_vfio_migration_state_notifier(vbasedev->name,
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MigrationStatus_str(s->state));
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trace_vfio_migration_state_notifier(vbasedev->name, e->type);
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switch (s->state) {
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case MIGRATION_STATUS_CANCELLING:
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case MIGRATION_STATUS_CANCELLED:
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case MIGRATION_STATUS_FAILED:
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if (e->type == MIG_EVENT_PRECOPY_FAILED) {
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vfio_migration_set_state_or_reset(vbasedev, VFIO_DEVICE_STATE_RUNNING);
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}
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return 0;
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@ -153,7 +153,7 @@ vfio_load_state(const char *name, uint64_t data) " (%s) data 0x%"PRIx64
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vfio_load_state_device_data(const char *name, uint64_t data_size, int ret) " (%s) size 0x%"PRIx64" ret %d"
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vfio_migration_realize(const char *name) " (%s)"
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vfio_migration_set_state(const char *name, const char *state) " (%s) state %s"
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vfio_migration_state_notifier(const char *name, const char *state) " (%s) state %s"
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vfio_migration_state_notifier(const char *name, int state) " (%s) state %d"
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vfio_save_block(const char *name, int data_size) " (%s) data_size %d"
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vfio_save_cleanup(const char *name) " (%s)"
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vfio_save_complete_precopy(const char *name, int ret) " (%s) ret %d"
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@ -60,10 +60,31 @@ void migration_object_init(void);
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void migration_shutdown(void);
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bool migration_is_idle(void);
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bool migration_is_active(MigrationState *);
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typedef enum MigrationEventType {
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MIG_EVENT_PRECOPY_SETUP,
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MIG_EVENT_PRECOPY_DONE,
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MIG_EVENT_PRECOPY_FAILED,
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MIG_EVENT_MAX
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} MigrationEventType;
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typedef struct MigrationEvent {
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MigrationEventType type;
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} MigrationEvent;
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/*
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* Register the notifier @notify to be called when a migration event occurs
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* for MIG_MODE_NORMAL, as specified by the MigrationEvent passed to @func.
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* Notifiers may receive events in any of the following orders:
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* - MIG_EVENT_PRECOPY_SETUP -> MIG_EVENT_PRECOPY_DONE
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* - MIG_EVENT_PRECOPY_SETUP -> MIG_EVENT_PRECOPY_FAILED
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* - MIG_EVENT_PRECOPY_FAILED
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*/
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void migration_add_notifier(NotifierWithReturn *notify,
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NotifierWithReturnFunc func);
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void migration_remove_notifier(NotifierWithReturn *notify);
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void migration_call_notifiers(MigrationState *s);
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void migration_call_notifiers(MigrationState *s, MigrationEventType type);
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bool migration_in_setup(MigrationState *);
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bool migration_has_finished(MigrationState *);
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bool migration_has_failed(MigrationState *);
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@ -1319,6 +1319,8 @@ void migrate_set_state(int *state, int old_state, int new_state)
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static void migrate_fd_cleanup(MigrationState *s)
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{
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MigrationEventType type;
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g_free(s->hostname);
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s->hostname = NULL;
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json_writer_free(s->vmdesc);
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@ -1367,7 +1369,9 @@ static void migrate_fd_cleanup(MigrationState *s)
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/* It is used on info migrate. We can't free it */
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error_report_err(error_copy(s->error));
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}
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migration_call_notifiers(s);
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type = migration_has_failed(s) ? MIG_EVENT_PRECOPY_FAILED :
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MIG_EVENT_PRECOPY_DONE;
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migration_call_notifiers(s, type);
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block_cleanup_parameters();
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yank_unregister_instance(MIGRATION_YANK_INSTANCE);
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}
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@ -1474,9 +1478,12 @@ void migration_remove_notifier(NotifierWithReturn *notify)
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}
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}
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void migration_call_notifiers(MigrationState *s)
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void migration_call_notifiers(MigrationState *s, MigrationEventType type)
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{
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notifier_with_return_list_notify(&migration_state_notifiers, s, 0);
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MigrationEvent e;
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e.type = type;
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notifier_with_return_list_notify(&migration_state_notifiers, &e, 0);
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}
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bool migration_in_setup(MigrationState *s)
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@ -2537,7 +2544,7 @@ static int postcopy_start(MigrationState *ms, Error **errp)
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* spice needs to trigger a transition now
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*/
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ms->postcopy_after_devices = true;
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migration_call_notifiers(ms);
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migration_call_notifiers(ms, MIG_EVENT_PRECOPY_DONE);
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migration_downtime_end(ms);
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@ -3601,7 +3608,7 @@ void migrate_fd_connect(MigrationState *s, Error *error_in)
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rate_limit = migrate_max_bandwidth();
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/* Notify before starting migration thread */
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migration_call_notifiers(s);
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migration_call_notifiers(s, MIG_EVENT_PRECOPY_SETUP);
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}
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migration_rate_set(rate_limit);
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@ -325,13 +325,13 @@ static void vhost_vdpa_net_log_global_enable(VhostVDPAState *s, bool enable)
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static int vdpa_net_migration_state_notifier(NotifierWithReturn *notifier,
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void *data, Error **errp)
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{
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MigrationState *migration = data;
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MigrationEvent *e = data;
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VhostVDPAState *s = container_of(notifier, VhostVDPAState,
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migration_state);
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if (migration_in_setup(migration)) {
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if (e->type == MIG_EVENT_PRECOPY_SETUP) {
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vhost_vdpa_net_log_global_enable(s, true);
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} else if (migration_has_failed(migration)) {
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} else if (e->type == MIG_EVENT_PRECOPY_FAILED) {
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vhost_vdpa_net_log_global_enable(s, false);
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}
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return 0;
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@ -571,19 +571,18 @@ static SpiceInfo *qmp_query_spice_real(Error **errp)
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static int migration_state_notifier(NotifierWithReturn *notifier,
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void *data, Error **errp)
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{
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MigrationState *s = data;
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MigrationEvent *e = data;
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if (!spice_have_target_host) {
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return 0;
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}
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if (migration_in_setup(s)) {
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if (e->type == MIG_EVENT_PRECOPY_SETUP) {
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spice_server_migrate_start(spice_server);
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} else if (migration_has_finished(s) ||
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migration_in_postcopy_after_devices(s)) {
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} else if (e->type == MIG_EVENT_PRECOPY_DONE) {
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spice_server_migrate_end(spice_server, true);
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spice_have_target_host = false;
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} else if (migration_has_failed(s)) {
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} else if (e->type == MIG_EVENT_PRECOPY_FAILED) {
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spice_server_migrate_end(spice_server, false);
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spice_have_target_host = false;
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}
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