balloon: Do not save VM state wrt asynchronous virtio operations
When working with the VM state (for loadvm/savevm and migration), it is not valid to load and store pointers since the validity of those pointers cannot be assured in the new qemu address space. Therefore, virtio_balloon_save() and virtio_balloon_load() must not handle the stats-related fields in struct VirtIOBalloon. If a memory stats request is in-flight at the time of a migration or savevm, the request will not complete and should be resubmitted once migration or loadvm completes. Note that this extremely small race window can only be triggered using QMP so it is not possible to hang the user monitor. Signed-off-by: NAdam Litke <agl@us.ibm.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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