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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
2023-09-11 08:34:06 +02:00
committed by Cédric Le Goater
parent f543aa222d
commit 08fc4cb517
5 changed files with 48 additions and 4 deletions
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include/migration/register.h
+5
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@@ -20,6 +20,11 @@ typedef struct SaveVMHandlers {
/* This runs inside the iothread lock. */
SaveStateHandler *save_state;
/*
* save_prepare is called early, even before migration starts, and can be
* used to perform early checks.
*/
int (*save_prepare)(void *opaque, Error **errp);
void (*save_cleanup)(void *opaque);
int (*save_live_complete_postcopy)(QEMUFile *f, void *opaque);
int (*save_live_complete_precopy)(QEMUFile *f, void *opaque);