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replay: flush rr queue before loading the vmstate

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Non-empty record/replay queue prevents saving and loading the VM state,
because it includes pending bottom halves and block coroutines.
But when the new VM state is loaded, we don't have to preserve the consistency
of the current state anymore. Therefore this patch just flushes the queue
allowing the coroutines to finish and removes checking for empty rr queue
for load_snapshot function.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <160174521762.12451.15752448887893855757.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2020-10-03 20:13:37 +03:00 • committed by Paolo Bonzini
parent f6baed3d14
commit f9a9fb6516
4 changed files with 12 additions and 8 deletions
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12
migration/savevm.c
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@ -2881,12 +2881,6 @@ int load_snapshot(const char *name, Error **errp)
AioContext *aio_context;
MigrationIncomingState *mis = migration_incoming_get_current();
if (!replay_can_snapshot()) {
error_setg(errp, "Record/replay does not allow loading snapshot "
"right now. Try once more later.");
return -EINVAL;
}
if (!bdrv_all_can_snapshot(&bs)) {
error_setg(errp,
"Device '%s' is writable but does not support snapshots",
@ -2920,6 +2914,12 @@ int load_snapshot(const char *name, Error **errp)
return -EINVAL;
}
/*
* Flush the record/replay queue. Now the VM state is going
* to change. Therefore we don't need to preserve its consistency
*/
replay_flush_events();
/* Flush all IO requests so they don't interfere with the new state. */
bdrv_drain_all_begin();