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/*
* Virtual hardware watchdog.
*
* Copyright (C) 2009 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
* By Richard W.M. Jones (rjones@redhat.com).
*/
#include "qemu-common.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "qemu/queue.h"
#include "qapi/qmp/types.h"
#include "sysemu/sysemu.h"
#include "sysemu/watchdog.h"
#include "qapi-event.h"
#include "hw/nmi.h"
/* Possible values for action parameter. */
#define WDT_RESET 1 /* Hard reset. */
#define WDT_SHUTDOWN 2 /* Shutdown. */
#define WDT_POWEROFF 3 /* Quit. */
#define WDT_PAUSE 4 /* Pause. */
#define WDT_DEBUG 5 /* Prints a message and continues running. */
#define WDT_NONE 6 /* Do nothing. */
#define WDT_NMI 7 /* Inject nmi into the guest */
static int watchdog_action = WDT_RESET;
static QLIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list;
void watchdog_add_model(WatchdogTimerModel *model)
{
QLIST_INSERT_HEAD(&watchdog_list, model, entry);
}
/* Returns:
* 0 = continue
* 1 = exit program with error
* 2 = exit program without error
*/
int select_watchdog(const char *p)
{
WatchdogTimerModel *model;
QemuOpts *opts;
/* -watchdog ? lists available devices and exits cleanly. */
if (is_help_option(p)) {
QLIST_FOREACH(model, &watchdog_list, entry) {
fprintf(stderr, "\t%s\t%s\n",
model->wdt_name, model->wdt_description);
}
return 2;
}
QLIST_FOREACH(model, &watchdog_list, entry) {
if (strcasecmp(model->wdt_name, p) == 0) {
/* add the device */
opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
&error_abort);
qemu_opt_set(opts, "driver", p, &error_abort);
return 0;
}
}
fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n");
QLIST_FOREACH(model, &watchdog_list, entry) {
fprintf(stderr, "\t%s\t%s\n",
model->wdt_name, model->wdt_description);
}
return 1;
}
int select_watchdog_action(const char *p)
{
if (strcasecmp(p, "reset") == 0)
watchdog_action = WDT_RESET;
else if (strcasecmp(p, "shutdown") == 0)
watchdog_action = WDT_SHUTDOWN;
else if (strcasecmp(p, "poweroff") == 0)
watchdog_action = WDT_POWEROFF;
else if (strcasecmp(p, "pause") == 0)
watchdog_action = WDT_PAUSE;
else if (strcasecmp(p, "debug") == 0)
watchdog_action = WDT_DEBUG;
else if (strcasecmp(p, "none") == 0)
watchdog_action = WDT_NONE;
else if (strcasecmp(p, "inject-nmi") == 0)
watchdog_action = WDT_NMI;
else
return -1;
return 0;
}
/* This actually performs the "action" once a watchdog has expired,
* ie. reboot, shutdown, exit, etc.
*/
void watchdog_perform_action(void)
{
switch (watchdog_action) {
case WDT_RESET: /* same as 'system_reset' in monitor */
qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_RESET, &error_abort);
qemu_system_reset_request();
break;
case WDT_SHUTDOWN: /* same as 'system_powerdown' in monitor */
qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_SHUTDOWN, &error_abort);
qemu_system_powerdown_request();
break;
case WDT_POWEROFF: /* same as 'quit' command in monitor */
qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_POWEROFF, &error_abort);
exit(0);
case WDT_PAUSE: /* same as 'stop' command in monitor */
/* In a timer callback, when vm_stop calls qemu_clock_enable
* you would get a deadlock. Bypass the problem.
*/
qemu_system_vmstop_request_prepare();
qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_PAUSE, &error_abort);
qemu_system_vmstop_request(RUN_STATE_WATCHDOG);
break;
case WDT_DEBUG:
qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_DEBUG, &error_abort);
fprintf(stderr, "watchdog: timer fired\n");
break;
case WDT_NONE:
qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_NONE, &error_abort);
break;
case WDT_NMI:
qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_INJECT_NMI,
&error_abort);
inject_nmi();
break;
}
}
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