cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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vm-change-state-handler.c (2091B)

      1/*
      2 *  qdev vm change state handlers
      3 *
      4 *  This program is free software; you can redistribute it and/or modify
      5 *  it under the terms of the GNU General Public License as published by
      6 *  the Free Software Foundation; either version 2 of the License,
      7 *  or (at your option) any later version.
      8 *
      9 *  This program is distributed in the hope that it will be useful,
     10 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
     11 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     12 *  GNU General Public License for more details.
     13 *
     14 *  You should have received a copy of the GNU General Public License
     15 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
     16 */
     17
     18#include "qemu/osdep.h"
     19#include "hw/qdev-core.h"
     20#include "sysemu/runstate.h"
     21
     22static int qdev_get_dev_tree_depth(DeviceState *dev)
     23{
     24    int depth;
     25
     26    for (depth = 0; dev; depth++) {
     27        BusState *bus = dev->parent_bus;
     28
     29        if (!bus) {
     30            break;
     31        }
     32
     33        dev = bus->parent;
     34    }
     35
     36    return depth;
     37}
     38
     39/**
     40 * qdev_add_vm_change_state_handler:
     41 * @dev: the device that owns this handler
     42 * @cb: the callback function to be invoked
     43 * @opaque: user data passed to the callback function
     44 *
     45 * This function works like qemu_add_vm_change_state_handler() except callbacks
     46 * are invoked in qdev tree depth order.  Ordering is desirable when callbacks
     47 * of children depend on their parent's callback having completed first.
     48 *
     49 * For example, when qdev_add_vm_change_state_handler() is used, a host
     50 * controller's callback is invoked before the children on its bus when the VM
     51 * starts running.  The order is reversed when the VM stops running.
     52 *
     53 * Returns: an entry to be freed with qemu_del_vm_change_state_handler()
     54 */
     55VMChangeStateEntry *qdev_add_vm_change_state_handler(DeviceState *dev,
     56                                                     VMChangeStateHandler *cb,
     57                                                     void *opaque)
     58{
     59    int depth = qdev_get_dev_tree_depth(dev);
     60
     61    return qemu_add_vm_change_state_handler_prio(cb, opaque, depth);
     62}