02b2e25360
Add qdev_add_vm_change_state_handler_full() variant that allows setting a prepare callback in addition to the main callback. This will facilitate adding P2P support for VFIO migration in the following patches. Signed-off-by: Avihai Horon <avihaih@nvidia.com> Signed-off-by: Joao Martins <joao.m.martins@oracle.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Tested-by: YangHang Liu <yanghliu@redhat.com> Signed-off-by: Cédric Le Goater <clg@redhat.com>
75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/*
|
|
* qdev vm change state handlers
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License,
|
|
* or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "hw/qdev-core.h"
|
|
#include "sysemu/runstate.h"
|
|
|
|
static int qdev_get_dev_tree_depth(DeviceState *dev)
|
|
{
|
|
int depth;
|
|
|
|
for (depth = 0; dev; depth++) {
|
|
BusState *bus = dev->parent_bus;
|
|
|
|
if (!bus) {
|
|
break;
|
|
}
|
|
|
|
dev = bus->parent;
|
|
}
|
|
|
|
return depth;
|
|
}
|
|
|
|
/**
|
|
* qdev_add_vm_change_state_handler:
|
|
* @dev: the device that owns this handler
|
|
* @cb: the callback function to be invoked
|
|
* @opaque: user data passed to the callback function
|
|
*
|
|
* This function works like qemu_add_vm_change_state_handler() except callbacks
|
|
* are invoked in qdev tree depth order. Ordering is desirable when callbacks
|
|
* of children depend on their parent's callback having completed first.
|
|
*
|
|
* For example, when qdev_add_vm_change_state_handler() is used, a host
|
|
* controller's callback is invoked before the children on its bus when the VM
|
|
* starts running. The order is reversed when the VM stops running.
|
|
*
|
|
* Returns: an entry to be freed with qemu_del_vm_change_state_handler()
|
|
*/
|
|
VMChangeStateEntry *qdev_add_vm_change_state_handler(DeviceState *dev,
|
|
VMChangeStateHandler *cb,
|
|
void *opaque)
|
|
{
|
|
return qdev_add_vm_change_state_handler_full(dev, cb, NULL, opaque);
|
|
}
|
|
|
|
/*
|
|
* Exactly like qdev_add_vm_change_state_handler() but passes a prepare_cb
|
|
* argument too.
|
|
*/
|
|
VMChangeStateEntry *qdev_add_vm_change_state_handler_full(
|
|
DeviceState *dev, VMChangeStateHandler *cb,
|
|
VMChangeStateHandler *prepare_cb, void *opaque)
|
|
{
|
|
int depth = qdev_get_dev_tree_depth(dev);
|
|
|
|
return qemu_add_vm_change_state_handler_prio_full(cb, prepare_cb, opaque,
|
|
depth);
|
|
}
|