diff --git a/include/sysemu/runstate.h b/include/sysemu/runstate.h index 7beb29c2e2..764a0fc6a4 100644 --- a/include/sysemu/runstate.h +++ b/include/sysemu/runstate.h @@ -16,6 +16,10 @@ VMChangeStateEntry *qemu_add_vm_change_state_handler(VMChangeStateHandler *cb, void *opaque); VMChangeStateEntry *qemu_add_vm_change_state_handler_prio( VMChangeStateHandler *cb, void *opaque, int priority); +VMChangeStateEntry * +qemu_add_vm_change_state_handler_prio_full(VMChangeStateHandler *cb, + VMChangeStateHandler *prepare_cb, + void *opaque, int priority); VMChangeStateEntry *qdev_add_vm_change_state_handler(DeviceState *dev, VMChangeStateHandler *cb, void *opaque); diff --git a/softmmu/runstate.c b/softmmu/runstate.c index f3bd862818..1652ed0439 100644 --- a/softmmu/runstate.c +++ b/softmmu/runstate.c @@ -271,6 +271,7 @@ void qemu_system_vmstop_request(RunState state) } struct VMChangeStateEntry { VMChangeStateHandler *cb; + VMChangeStateHandler *prepare_cb; void *opaque; QTAILQ_ENTRY(VMChangeStateEntry) entries; int priority; @@ -293,12 +294,39 @@ static QTAILQ_HEAD(, VMChangeStateEntry) vm_change_state_head = */ VMChangeStateEntry *qemu_add_vm_change_state_handler_prio( VMChangeStateHandler *cb, void *opaque, int priority) +{ + return qemu_add_vm_change_state_handler_prio_full(cb, NULL, opaque, + priority); +} + +/** + * qemu_add_vm_change_state_handler_prio_full: + * @cb: the main callback to invoke + * @prepare_cb: a callback to invoke before the main callback + * @opaque: user data passed to the callbacks + * @priority: low priorities execute first when the vm runs and the reverse is + * true when the vm stops + * + * Register a main callback function and an optional prepare callback function + * that are invoked when the vm starts or stops running. The main callback and + * the prepare callback are called in two separate phases: First all prepare + * callbacks are called and only then all main callbacks are called. As its + * name suggests, the prepare callback can be used to do some preparatory work + * before invoking the main callback. + * + * Returns: an entry to be freed using qemu_del_vm_change_state_handler() + */ +VMChangeStateEntry * +qemu_add_vm_change_state_handler_prio_full(VMChangeStateHandler *cb, + VMChangeStateHandler *prepare_cb, + void *opaque, int priority) { VMChangeStateEntry *e; VMChangeStateEntry *other; e = g_malloc0(sizeof(*e)); e->cb = cb; + e->prepare_cb = prepare_cb; e->opaque = opaque; e->priority = priority; @@ -333,10 +361,22 @@ void vm_state_notify(bool running, RunState state) trace_vm_state_notify(running, state, RunState_str(state)); if (running) { + QTAILQ_FOREACH_SAFE(e, &vm_change_state_head, entries, next) { + if (e->prepare_cb) { + e->prepare_cb(e->opaque, running, state); + } + } + QTAILQ_FOREACH_SAFE(e, &vm_change_state_head, entries, next) { e->cb(e->opaque, running, state); } } else { + QTAILQ_FOREACH_REVERSE_SAFE(e, &vm_change_state_head, entries, next) { + if (e->prepare_cb) { + e->prepare_cb(e->opaque, running, state); + } + } + QTAILQ_FOREACH_REVERSE_SAFE(e, &vm_change_state_head, entries, next) { e->cb(e->opaque, running, state); }