1 /* 2 * Virtual hardware watchdog. 3 * 4 * Copyright (C) 2009 Red Hat Inc. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 2 9 * of the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see <http://www.gnu.org/licenses/>. 18 * 19 * By Richard W.M. Jones (rjones@redhat.com). 20 */ 21 22 #include "qemu/osdep.h" 23 #include "qemu/option.h" 24 #include "qemu/config-file.h" 25 #include "qemu/queue.h" 26 #include "qapi/error.h" 27 #include "qapi/qapi-commands-run-state.h" 28 #include "qapi/qapi-events-run-state.h" 29 #include "sysemu/runstate.h" 30 #include "sysemu/watchdog.h" 31 #include "hw/nmi.h" 32 #include "qemu/help_option.h" 33 34 static WatchdogAction watchdog_action = WATCHDOG_ACTION_RESET; 35 36 WatchdogAction get_watchdog_action(void) 37 { 38 return watchdog_action; 39 } 40 41 /* This actually performs the "action" once a watchdog has expired, 42 * ie. reboot, shutdown, exit, etc. 43 */ 44 void watchdog_perform_action(void) 45 { 46 switch (watchdog_action) { 47 case WATCHDOG_ACTION_RESET: /* same as 'system_reset' in monitor */ 48 qapi_event_send_watchdog(WATCHDOG_ACTION_RESET); 49 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); 50 break; 51 52 case WATCHDOG_ACTION_SHUTDOWN: /* same as 'system_powerdown' in monitor */ 53 qapi_event_send_watchdog(WATCHDOG_ACTION_SHUTDOWN); 54 qemu_system_powerdown_request(); 55 break; 56 57 case WATCHDOG_ACTION_POWEROFF: /* same as 'quit' command in monitor */ 58 qapi_event_send_watchdog(WATCHDOG_ACTION_POWEROFF); 59 exit(0); 60 61 case WATCHDOG_ACTION_PAUSE: /* same as 'stop' command in monitor */ 62 /* In a timer callback, when vm_stop calls qemu_clock_enable 63 * you would get a deadlock. Bypass the problem. 64 */ 65 qemu_system_vmstop_request_prepare(); 66 qapi_event_send_watchdog(WATCHDOG_ACTION_PAUSE); 67 qemu_system_vmstop_request(RUN_STATE_WATCHDOG); 68 break; 69 70 case WATCHDOG_ACTION_DEBUG: 71 qapi_event_send_watchdog(WATCHDOG_ACTION_DEBUG); 72 fprintf(stderr, "watchdog: timer fired\n"); 73 break; 74 75 case WATCHDOG_ACTION_NONE: 76 qapi_event_send_watchdog(WATCHDOG_ACTION_NONE); 77 break; 78 79 case WATCHDOG_ACTION_INJECT_NMI: 80 qapi_event_send_watchdog(WATCHDOG_ACTION_INJECT_NMI); 81 nmi_monitor_handle(0, NULL); 82 break; 83 84 default: 85 assert(0); 86 } 87 } 88 89 void qmp_watchdog_set_action(WatchdogAction action, Error **errp) 90 { 91 watchdog_action = action; 92 } 93