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system/runstate: add VM state change cb with return value

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This patch adds the new VM state change cb type `VMChangeStateHandlerWithRet`,
which has return value for `VMChangeStateEntry`.

Thus, we can register a new VM state change cb with return value for device.
Note that `VMChangeStateHandler` and `VMChangeStateHandlerWithRet` are mutually
exclusive and cannot be provided at the same time.

This patch is the pre patch for 'vhost-user: return failure if backend crashes
when live migration', which makes the live migration aware of the loss of
connection with the vhost-user backend and aborts the live migration.

Virtio device will use VMChangeStateHandlerWithRet.

Signed-off-by: Haoqian He <haoqian.he@smartx.com>
Message-Id: <20250416024729.3289157-2-haoqian.he@smartx.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Haoqian He 2025-04-15 22:47:26 -04:00 • committed by Michael S. Tsirkin
parent 8717987fb5
commit e0f300b36d
8 changed files with 62 additions and 20 deletions
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13
include/system/runstate.h
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@ -12,6 +12,7 @@ bool runstate_needs_reset(void);
void runstate_replay_enable(void);
typedef void VMChangeStateHandler(void *opaque, bool running, RunState state);
typedef int VMChangeStateHandlerWithRet(void *opaque, bool running, RunState state);
VMChangeStateEntry *qemu_add_vm_change_state_handler(VMChangeStateHandler *cb,
void *opaque);
@ -20,21 +21,27 @@ VMChangeStateEntry *qemu_add_vm_change_state_handler_prio(
VMChangeStateEntry *
qemu_add_vm_change_state_handler_prio_full(VMChangeStateHandler *cb,
VMChangeStateHandler *prepare_cb,
VMChangeStateHandlerWithRet *cb_ret,
void *opaque, int priority);
VMChangeStateEntry *qdev_add_vm_change_state_handler(DeviceState *dev,
VMChangeStateHandler *cb,
VMChangeStateHandlerWithRet *cb_ret,
void *opaque);
VMChangeStateEntry *qdev_add_vm_change_state_handler_full(
DeviceState *dev, VMChangeStateHandler *cb,
VMChangeStateHandler *prepare_cb, void *opaque);
DeviceState *dev, VMChangeStateHandler *cb, VMChangeStateHandler *prepare_cb,
VMChangeStateHandlerWithRet *cb_ret, void *opaque);
void qemu_del_vm_change_state_handler(VMChangeStateEntry *e);
/**
* vm_state_notify: Notify the state of the VM
*
* @running: whether the VM is running or not.
* @state: the #RunState of the VM.
*
* Return the result of the callback which has return value.
* If no callback has return value, still return 0 and the
* upper layer should not do additional processing.
*/
void vm_state_notify(bool running, RunState state);
int vm_state_notify(bool running, RunState state);
static inline bool shutdown_caused_by_guest(ShutdownCause cause)
{