vmstate: Mark VMStateInfo.get/put() coroutine_mixed_fn

Migration code can run both in coroutine context (the usual case) and
non-coroutine context (at least savevm/loadvm for snapshots). This also
affects the VMState callbacks, and devices must consider this. Change
the callback definition in VMStateInfo to be explicit about it.

Signed-off-by: Kevin Wolf <[email protected]>
Message-ID: <[email protected]>
Acked-by: Peter Xu <[email protected]>
Reviewed-by: Stefan Hajnoczi <[email protected]>
Signed-off-by: Kevin Wolf <[email protected]>

Author: kevmw

include/migration/vmstate.h

@@ -41,9 +41,11 @@ typedef struct VMStateField VMStateField;
  */
 struct VMStateInfo {
     const char *name;
-    int (*get)(QEMUFile *f, void *pv, size_t size, const VMStateField *field);
-    int (*put)(QEMUFile *f, void *pv, size_t size, const VMStateField *field,
-               JSONWriter *vmdesc);
+    int coroutine_mixed_fn (*get)(QEMUFile *f, void *pv, size_t size,
+                                  const VMStateField *field);
+    int coroutine_mixed_fn (*put)(QEMUFile *f, void *pv, size_t size,
+                                  const VMStateField *field,
+                                  JSONWriter *vmdesc);
 };
 
 enum VMStateFlags {