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migration: MigrationEvent for notifiers

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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>
This commit is contained in:
Steve Sistare 2024-02-22 09:28:30 -08:00 committed by Peter Xu
parent 3e7757301c
commit 9d9babf78d
7 changed files with 51 additions and 27 deletions
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11
hw/net/virtio-net.c
View file

@ -3504,7 +3504,7 @@ out:
return !err;
}
static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationState *s)
static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationEvent *e)
{
bool should_be_hidden;
Error *err = NULL;
@ -3516,7 +3516,7 @@ static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationState *s)
should_be_hidden = qatomic_read(&n->failover_primary_hidden);
if (migration_in_setup(s) && !should_be_hidden) {
if (e->type == MIG_EVENT_PRECOPY_SETUP && !should_be_hidden) {
if (failover_unplug_primary(n, dev)) {
vmstate_unregister(VMSTATE_IF(dev), qdev_get_vmsd(dev), dev);
qapi_event_send_unplug_primary(dev->id);
@ -3524,7 +3524,7 @@ static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationState *s)
} else {
warn_report("couldn't unplug primary device");
}
} else if (migration_has_failed(s)) {
} else if (e->type == MIG_EVENT_PRECOPY_FAILED) {
/* We already unplugged the device let's plug it back */
if (!failover_replug_primary(n, dev, &err)) {
if (err) {
@ -3537,9 +3537,10 @@ static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationState *s)
static int virtio_net_migration_state_notifier(NotifierWithReturn *notifier,
void *data, Error **errp)
{
MigrationState *s = data;
MigrationEvent *e = data;
VirtIONet *n = container_of(notifier, VirtIONet, migration_state);
virtio_net_handle_migration_primary(n, s);
virtio_net_handle_migration_primary(n, e);
return 0;
}

10
hw/vfio/migration.c
View file

@ -757,18 +757,14 @@ static void vfio_vmstate_change(void *opaque, bool running, RunState state)
static int vfio_migration_state_notifier(NotifierWithReturn *notifier,
void *data, Error **errp)
{
MigrationState *s = data;
MigrationEvent *e = data;
VFIOMigration *migration = container_of(notifier, VFIOMigration,
migration_state);
VFIODevice *vbasedev = migration->vbasedev;
trace_vfio_migration_state_notifier(vbasedev->name,
MigrationStatus_str(s->state));
trace_vfio_migration_state_notifier(vbasedev->name, e->type);
switch (s->state) {
case MIGRATION_STATUS_CANCELLING:
case MIGRATION_STATUS_CANCELLED:
case MIGRATION_STATUS_FAILED:
if (e->type == MIG_EVENT_PRECOPY_FAILED) {
vfio_migration_set_state_or_reset(vbasedev, VFIO_DEVICE_STATE_RUNNING);
}
return 0;

2
hw/vfio/trace-events
View file

@ -153,7 +153,7 @@ vfio_load_state(const char *name, uint64_t data) " (%s) data 0x%"PRIx64
vfio_load_state_device_data(const char *name, uint64_t data_size, int ret) " (%s) size 0x%"PRIx64" ret %d"
vfio_migration_realize(const char *name) " (%s)"
vfio_migration_set_state(const char *name, const char *state) " (%s) state %s"
vfio_migration_state_notifier(const char *name, const char *state) " (%s) state %s"
vfio_migration_state_notifier(const char *name, int state) " (%s) state %d"
vfio_save_block(const char *name, int data_size) " (%s) data_size %d"
vfio_save_cleanup(const char *name) " (%s)"
vfio_save_complete_precopy(const char *name, int ret) " (%s) ret %d"

23
include/migration/misc.h
View file

@ -60,10 +60,31 @@ void migration_object_init(void);
void migration_shutdown(void);
bool migration_is_idle(void);
bool migration_is_active(MigrationState *);
typedef enum MigrationEventType {
MIG_EVENT_PRECOPY_SETUP,
MIG_EVENT_PRECOPY_DONE,
MIG_EVENT_PRECOPY_FAILED,
MIG_EVENT_MAX
} MigrationEventType;
typedef struct MigrationEvent {
MigrationEventType type;
} MigrationEvent;
/*
* Register the notifier @notify to be called when a migration event occurs
* for MIG_MODE_NORMAL, as specified by the MigrationEvent passed to @func.
* Notifiers may receive events in any of the following orders:
* - MIG_EVENT_PRECOPY_SETUP -> MIG_EVENT_PRECOPY_DONE
* - MIG_EVENT_PRECOPY_SETUP -> MIG_EVENT_PRECOPY_FAILED
* - MIG_EVENT_PRECOPY_FAILED
*/
void migration_add_notifier(NotifierWithReturn *notify,
NotifierWithReturnFunc func);
void migration_remove_notifier(NotifierWithReturn *notify);
void migration_call_notifiers(MigrationState *s);
void migration_call_notifiers(MigrationState *s, MigrationEventType type);
bool migration_in_setup(MigrationState *);
bool migration_has_finished(MigrationState *);
bool migration_has_failed(MigrationState *);

17
migration/migration.c
View file

@ -1319,6 +1319,8 @@ void migrate_set_state(int *state, int old_state, int new_state)
static void migrate_fd_cleanup(MigrationState *s)
{
MigrationEventType type;
g_free(s->hostname);
s->hostname = NULL;
json_writer_free(s->vmdesc);
@ -1367,7 +1369,9 @@ static void migrate_fd_cleanup(MigrationState *s)
/* It is used on info migrate. We can't free it */
error_report_err(error_copy(s->error));
}
migration_call_notifiers(s);
type = migration_has_failed(s) ? MIG_EVENT_PRECOPY_FAILED :
MIG_EVENT_PRECOPY_DONE;
migration_call_notifiers(s, type);
block_cleanup_parameters();
yank_unregister_instance(MIGRATION_YANK_INSTANCE);
}
@ -1474,9 +1478,12 @@ void migration_remove_notifier(NotifierWithReturn *notify)
}
}
void migration_call_notifiers(MigrationState *s)
void migration_call_notifiers(MigrationState *s, MigrationEventType type)
{
notifier_with_return_list_notify(&migration_state_notifiers, s, 0);
MigrationEvent e;
e.type = type;
notifier_with_return_list_notify(&migration_state_notifiers, &e, 0);
}
bool migration_in_setup(MigrationState *s)
@ -2537,7 +2544,7 @@ static int postcopy_start(MigrationState *ms, Error **errp)
* spice needs to trigger a transition now
*/
ms->postcopy_after_devices = true;
migration_call_notifiers(ms);
migration_call_notifiers(ms, MIG_EVENT_PRECOPY_DONE);
migration_downtime_end(ms);
@ -3601,7 +3608,7 @@ void migrate_fd_connect(MigrationState *s, Error *error_in)
rate_limit = migrate_max_bandwidth();
/* Notify before starting migration thread */
migration_call_notifiers(s);
migration_call_notifiers(s, MIG_EVENT_PRECOPY_SETUP);
}
migration_rate_set(rate_limit);

6
net/vhost-vdpa.c
View file

@ -325,13 +325,13 @@ static void vhost_vdpa_net_log_global_enable(VhostVDPAState *s, bool enable)
static int vdpa_net_migration_state_notifier(NotifierWithReturn *notifier,
void *data, Error **errp)
{
MigrationState *migration = data;
MigrationEvent *e = data;
VhostVDPAState *s = container_of(notifier, VhostVDPAState,
migration_state);
if (migration_in_setup(migration)) {
if (e->type == MIG_EVENT_PRECOPY_SETUP) {
vhost_vdpa_net_log_global_enable(s, true);
} else if (migration_has_failed(migration)) {
} else if (e->type == MIG_EVENT_PRECOPY_FAILED) {
vhost_vdpa_net_log_global_enable(s, false);
}
return 0;

9
ui/spice-core.c
View file

@ -571,19 +571,18 @@ static SpiceInfo *qmp_query_spice_real(Error **errp)
static int migration_state_notifier(NotifierWithReturn *notifier,
void *data, Error **errp)
{
MigrationState *s = data;
MigrationEvent *e = data;
if (!spice_have_target_host) {
return 0;
}
if (migration_in_setup(s)) {
if (e->type == MIG_EVENT_PRECOPY_SETUP) {
spice_server_migrate_start(spice_server);
} else if (migration_has_finished(s) ||
migration_in_postcopy_after_devices(s)) {
} else if (e->type == MIG_EVENT_PRECOPY_DONE) {
spice_server_migrate_end(spice_server, true);
spice_have_target_host = false;
} else if (migration_has_failed(s)) {
} else if (e->type == MIG_EVENT_PRECOPY_FAILED) {
spice_server_migrate_end(spice_server, false);
spice_have_target_host = false;
}