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migration: introduce SaveVMHandlers.resume_prepare

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This is hook function to be called when a postcopy migration wants to
resume from a failure. For each module, it should provide its own
recovery logic before we switch to the postcopy-active state.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180502104740.12123-16-peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Peter Xu 2018-05-02 18:47:31 +08:00 • committed by Juan Quintela
parent 13955b89ce
commit d1b8eadbc4
5 changed files with 48 additions and 1 deletions
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25
migration/savevm.c
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@ -1031,6 +1031,31 @@ void qemu_savevm_state_setup(QEMUFile *f)
}
}
int qemu_savevm_state_resume_prepare(MigrationState *s)
{
SaveStateEntry *se;
int ret;
trace_savevm_state_resume_prepare();
QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
if (!se->ops || !se->ops->resume_prepare) {
continue;
}
if (se->ops && se->ops->is_active) {
if (!se->ops->is_active(se->opaque)) {
continue;
}
}
ret = se->ops->resume_prepare(s, se->opaque);
if (ret < 0) {
return ret;
}
}
return 0;
}
/*
* this function has three return values:
* negative: there was one error, and we have -errno.