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migration: Define VMSTATE_INSTANCE_ID_ANY

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Define the new macro VMSTATE_INSTANCE_ID_ANY for callers who wants to
auto-generate the vmstate instance ID.  Previously it was hard coded
as -1 instead of this macro.  It helps to change this default value in
the follow up patches.  No functional change.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Peter Xu 2019-10-16 10:29:30 +08:00 • committed by Juan Quintela
parent 8bba004cca
commit 1df2c9a26f
15 changed files with 25 additions and 17 deletions
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2
include/migration/vmstate.h
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@ -1157,6 +1157,8 @@ int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd,
bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque);
#define VMSTATE_INSTANCE_ID_ANY -1
/* Returns: 0 on success, -1 on failure */
int vmstate_register_with_alias_id(VMStateIf *obj, int instance_id,
const VMStateDescription *vmsd,