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 #include "trace.h" 34 35 static WatchdogAction watchdog_action = WATCHDOG_ACTION_RESET; 36 37 WatchdogAction get_watchdog_action(void) 38 { 39 return watchdog_action; 40 } 41 42 /* This actually performs the "action" once a watchdog has expired, 43 * ie. reboot, shutdown, exit, etc. 44 */ 45 void watchdog_perform_action(void) 46 { 47 trace_watchdog_perform_action(watchdog_action); 48 49 switch (watchdog_action) { 50 case WATCHDOG_ACTION_RESET: /* same as 'system_reset' in monitor */ 51 qapi_event_send_watchdog(WATCHDOG_ACTION_RESET); 52 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); 53 break; 54 55 case WATCHDOG_ACTION_SHUTDOWN: /* same as 'system_powerdown' in monitor */ 56 qapi_event_send_watchdog(WATCHDOG_ACTION_SHUTDOWN); 57 qemu_system_powerdown_request(); 58 break; 59 60 case WATCHDOG_ACTION_POWEROFF: /* same as 'quit' command in monitor */ 61 qapi_event_send_watchdog(WATCHDOG_ACTION_POWEROFF); 62 exit(0); 63 64 case WATCHDOG_ACTION_PAUSE: /* same as 'stop' command in monitor */ 65 /* In a timer callback, when vm_stop calls qemu_clock_enable 66 * you would get a deadlock. Bypass the problem. 67 */ 68 qemu_system_vmstop_request_prepare(); 69 qapi_event_send_watchdog(WATCHDOG_ACTION_PAUSE); 70 qemu_system_vmstop_request(RUN_STATE_WATCHDOG); 71 break; 72 73 case WATCHDOG_ACTION_DEBUG: 74 qapi_event_send_watchdog(WATCHDOG_ACTION_DEBUG); 75 fprintf(stderr, "watchdog: timer fired\n"); 76 break; 77 78 case WATCHDOG_ACTION_NONE: 79 qapi_event_send_watchdog(WATCHDOG_ACTION_NONE); 80 break; 81 82 case WATCHDOG_ACTION_INJECT_NMI: 83 qapi_event_send_watchdog(WATCHDOG_ACTION_INJECT_NMI); 84 nmi_monitor_handle(0, NULL); 85 break; 86 87 default: 88 g_assert_not_reached(); 89 } 90 } 91 92 void qmp_watchdog_set_action(WatchdogAction action, Error **errp) 93 { 94 watchdog_action = action; 95 trace_watchdog_set_action(watchdog_action); 96 } 97