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Postcopy+spice: Pass spice migration data earlier

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Spice hooks the migration status changes to figure out when to
transmit information to the new spice server; but the migration
status in postcopy doesn't quite fit - the destination starts
running before the end of the source migration.

It's not a case of hanging off the migration status change to
postcopy-active either, since that happens before we stop the
guest CPU.

Fix it by sending a notify just after sending the device state,
and adding a flag that can be tested by the notify receiver.

Symptom:
   spice handover doesn't work with the error:
   red_worker.c:11540:display_channel_wait_for_migrate_data: timeout

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Message-id: 1456161452-25318-1-git-send-email-dgilbert@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2016-02-22 17:17:32 +00:00 • committed by Gerd Hoffmann
parent 22672a3798
commit b82fc321bf
3 changed files with 20 additions and 1 deletions
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14
migration/migration.c
View file

@ -905,6 +905,11 @@ bool migration_in_postcopy(MigrationState *s)
return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
}
bool migration_in_postcopy_after_devices(MigrationState *s)
{
return migration_in_postcopy(s) && s->postcopy_after_devices;
}
MigrationState *migrate_init(const MigrationParams *params)
{
MigrationState *s = migrate_get_current();
@ -930,6 +935,7 @@ MigrationState *migrate_init(const MigrationParams *params)
s->setup_time = 0;
s->dirty_sync_count = 0;
s->start_postcopy = false;
s->postcopy_after_devices = false;
s->migration_thread_running = false;
s->last_req_rb = NULL;
@ -1489,6 +1495,14 @@ static int postcopy_start(MigrationState *ms, bool *old_vm_running)
goto fail_closefb;
}
qemu_fclose(fb);
/* Send a notify to give a chance for anything that needs to happen
* at the transition to postcopy and after the device state; in particular
* spice needs to trigger a transition now
*/
ms->postcopy_after_devices = true;
notifier_list_notify(&migration_state_notifiers, ms);
ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop;
qemu_mutex_unlock_iothread();