6f10a29e76
The tracepoints aid in debugging the triggering of watchdog devices. Reviewed-by: Richard W.M. Jones <rjones@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20221216125749.596075-4-berrange@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
/*
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* Virtual hardware watchdog.
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*
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* By Richard W.M. Jones (rjones@redhat.com).
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*/
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#include "qemu/osdep.h"
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#include "qemu/option.h"
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#include "qemu/config-file.h"
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#include "qemu/queue.h"
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#include "qapi/error.h"
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#include "qapi/qapi-commands-run-state.h"
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#include "qapi/qapi-events-run-state.h"
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#include "sysemu/runstate.h"
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#include "sysemu/watchdog.h"
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#include "hw/nmi.h"
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#include "qemu/help_option.h"
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#include "trace.h"
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static WatchdogAction watchdog_action = WATCHDOG_ACTION_RESET;
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WatchdogAction get_watchdog_action(void)
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{
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return watchdog_action;
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}
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/* This actually performs the "action" once a watchdog has expired,
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* ie. reboot, shutdown, exit, etc.
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*/
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void watchdog_perform_action(void)
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{
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trace_watchdog_perform_action(watchdog_action);
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switch (watchdog_action) {
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case WATCHDOG_ACTION_RESET: /* same as 'system_reset' in monitor */
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qapi_event_send_watchdog(WATCHDOG_ACTION_RESET);
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qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
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break;
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case WATCHDOG_ACTION_SHUTDOWN: /* same as 'system_powerdown' in monitor */
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qapi_event_send_watchdog(WATCHDOG_ACTION_SHUTDOWN);
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qemu_system_powerdown_request();
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break;
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case WATCHDOG_ACTION_POWEROFF: /* same as 'quit' command in monitor */
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qapi_event_send_watchdog(WATCHDOG_ACTION_POWEROFF);
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exit(0);
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case WATCHDOG_ACTION_PAUSE: /* same as 'stop' command in monitor */
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/* In a timer callback, when vm_stop calls qemu_clock_enable
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* you would get a deadlock. Bypass the problem.
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*/
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qemu_system_vmstop_request_prepare();
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qapi_event_send_watchdog(WATCHDOG_ACTION_PAUSE);
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qemu_system_vmstop_request(RUN_STATE_WATCHDOG);
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break;
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case WATCHDOG_ACTION_DEBUG:
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qapi_event_send_watchdog(WATCHDOG_ACTION_DEBUG);
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fprintf(stderr, "watchdog: timer fired\n");
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break;
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case WATCHDOG_ACTION_NONE:
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qapi_event_send_watchdog(WATCHDOG_ACTION_NONE);
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break;
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case WATCHDOG_ACTION_INJECT_NMI:
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qapi_event_send_watchdog(WATCHDOG_ACTION_INJECT_NMI);
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nmi_monitor_handle(0, NULL);
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break;
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default:
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assert(0);
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}
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}
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void qmp_watchdog_set_action(WatchdogAction action, Error **errp)
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{
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watchdog_action = action;
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trace_watchdog_set_action(watchdog_action);
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}
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