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migration: Add .save_prepare() handler to struct SaveVMHandlers

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Add a new .save_prepare() handler to struct SaveVMHandlers. This handler
is called early, even before migration starts, and can be used by
devices to perform early checks.

Refactor migrate_init() to be able to return errors and call
.save_prepare() from there.

Suggested-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Avihai Horon 2023-09-06 18:08:51 +03:00 • committed by Cédric Le Goater
parent f543aa222d
commit 08fc4cb517
5 changed files with 48 additions and 4 deletions
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29
migration/savevm.c
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@ -1233,6 +1233,30 @@ bool qemu_savevm_state_guest_unplug_pending(void)
return false;
}
int qemu_savevm_state_prepare(Error **errp)
{
SaveStateEntry *se;
int ret;
QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
if (!se->ops || !se->ops->save_prepare) {
continue;
}
if (se->ops->is_active) {
if (!se->ops->is_active(se->opaque)) {
continue;
}
}
ret = se->ops->save_prepare(se->opaque, errp);
if (ret < 0) {
return ret;
}
}
return 0;
}
void qemu_savevm_state_setup(QEMUFile *f)
{
MigrationState *ms = migrate_get_current();
@ -1619,7 +1643,10 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp)
return -EINVAL;
}
migrate_init(ms);
ret = migrate_init(ms, errp);
if (ret) {
return ret;
}
ms->to_dst_file = f;
qemu_mutex_unlock_iothread();