[RFC V1 1/7] migration: cpr_needed_for_reuse

[Steve Sistare <steven.sistare@oracle.com>]

Define a vmstate "needed" helper.  This will be moved to the preceding patch
series "Live update: cpr-exec" because it is needed by multiple devices.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 include/migration/cpr.h | 1 +
 migration/cpr.c         | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/include/migration/cpr.h b/include/migration/cpr.h
index c6c60f87bc..8d20d3ec49 100644
--- a/include/migration/cpr.h
+++ b/include/migration/cpr.h
@@ -24,6 +24,7 @@ void cpr_resave_fd(const char *name, int id, int fd);
 
 int cpr_state_save(Error **errp);
 int cpr_state_load(Error **errp);
+bool cpr_needed_for_reuse(void *opaque);
 
 QEMUFile *cpr_exec_output(Error **errp);
 QEMUFile *cpr_exec_input(Error **errp);
diff --git a/migration/cpr.c b/migration/cpr.c
index f756c1552d..843241c073 100644
--- a/migration/cpr.c
+++ b/migration/cpr.c
@@ -236,3 +236,8 @@ int cpr_state_load(Error **errp)
     return ret;
 }
 
+bool cpr_needed_for_reuse(void *opaque)
+{
+    MigMode mode = migrate_mode();
+    return mode == MIG_MODE_CPR_EXEC;
+}
-- 
2.39.3