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balloon: Don't allow multiple balloon handler registrations
Multiple balloon devices don't make sense; disallow more than one registration attempt to register handlers. Signed-off-by: Amit Shah <amit.shah@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com>
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d4443cb616
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12
balloon.c
12
balloon.c
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@ -36,12 +36,20 @@ static QEMUBalloonEvent *balloon_event_fn;
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static QEMUBalloonStatus *balloon_stat_fn;
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static void *balloon_opaque;
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void qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
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QEMUBalloonStatus *stat_func, void *opaque)
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int qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
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QEMUBalloonStatus *stat_func, void *opaque)
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{
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if (balloon_event_fn || balloon_stat_fn || balloon_opaque) {
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/* We're already registered one balloon handler. How many can
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* a guest really have?
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*/
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error_report("Another balloon device already registered");
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return -1;
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}
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balloon_event_fn = event_func;
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balloon_stat_fn = stat_func;
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balloon_opaque = opaque;
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return 0;
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}
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static int qemu_balloon(ram_addr_t target)
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@ -20,8 +20,8 @@ typedef void (QEMUBalloonEvent)(void *opaque, ram_addr_t target);
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typedef void (QEMUBalloonStatus)(void *opaque, MonitorCompletion cb,
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void *cb_data);
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void qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
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QEMUBalloonStatus *stat_func, void *opaque);
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int qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
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QEMUBalloonStatus *stat_func, void *opaque);
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void monitor_print_balloon(Monitor *mon, const QObject *data);
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int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque);
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