| 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 "system/runstate.h" |
| 30 | #include "system/watchdog.h" |
| 31 | #include "hw/core/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_inject(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 | } |