30e5210a70
qemu_clock_enable says:
/* Disabling the clock will wait for related timerlists to stop
* executing qemu_run_timers. Thus, this functions should not
* be used from the callback of a timer that is based on @clock.
* Doing so would cause a deadlock.
*/
and it indeed does: vm_stop uses qemu_clock_enable on QEMU_CLOCK_VIRTUAL
and watchdogs are based on QEMU_CLOCK_VIRTUAL, and we get a deadlock.
Use qemu_system_vmstop_request_prepare()/qemu_system_vmstop_request()
instead; yet another alternative could be a BH.
I checked other occurrences of vm_stop and they should not have this
problem. RUN_STATE_IO_ERROR could in principle (it depends on the
code in the drivers) but it has been fixed by commit 2bd3bce, "block:
asynchronously stop the VM on I/O errors", 2014-06-05.
Tested-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
143 lines
4.5 KiB
C
143 lines
4.5 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-common.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/qmp/types.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/watchdog.h"
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#include "qapi-event.h"
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/* Possible values for action parameter. */
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#define WDT_RESET 1 /* Hard reset. */
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#define WDT_SHUTDOWN 2 /* Shutdown. */
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#define WDT_POWEROFF 3 /* Quit. */
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#define WDT_PAUSE 4 /* Pause. */
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#define WDT_DEBUG 5 /* Prints a message and continues running. */
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#define WDT_NONE 6 /* Do nothing. */
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static int watchdog_action = WDT_RESET;
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static QLIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list;
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void watchdog_add_model(WatchdogTimerModel *model)
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{
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QLIST_INSERT_HEAD(&watchdog_list, model, entry);
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}
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/* Returns:
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* 0 = continue
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* 1 = exit program with error
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* 2 = exit program without error
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*/
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int select_watchdog(const char *p)
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{
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WatchdogTimerModel *model;
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QemuOpts *opts;
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/* -watchdog ? lists available devices and exits cleanly. */
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if (is_help_option(p)) {
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QLIST_FOREACH(model, &watchdog_list, entry) {
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fprintf(stderr, "\t%s\t%s\n",
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model->wdt_name, model->wdt_description);
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}
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return 2;
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}
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QLIST_FOREACH(model, &watchdog_list, entry) {
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if (strcasecmp(model->wdt_name, p) == 0) {
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/* add the device */
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opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
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&error_abort);
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qemu_opt_set(opts, "driver", p);
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return 0;
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}
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}
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fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n");
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QLIST_FOREACH(model, &watchdog_list, entry) {
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fprintf(stderr, "\t%s\t%s\n",
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model->wdt_name, model->wdt_description);
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}
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return 1;
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}
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int select_watchdog_action(const char *p)
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{
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if (strcasecmp(p, "reset") == 0)
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watchdog_action = WDT_RESET;
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else if (strcasecmp(p, "shutdown") == 0)
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watchdog_action = WDT_SHUTDOWN;
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else if (strcasecmp(p, "poweroff") == 0)
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watchdog_action = WDT_POWEROFF;
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else if (strcasecmp(p, "pause") == 0)
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watchdog_action = WDT_PAUSE;
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else if (strcasecmp(p, "debug") == 0)
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watchdog_action = WDT_DEBUG;
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else if (strcasecmp(p, "none") == 0)
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watchdog_action = WDT_NONE;
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else
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return -1;
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return 0;
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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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switch (watchdog_action) {
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case WDT_RESET: /* same as 'system_reset' in monitor */
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qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_RESET, &error_abort);
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qemu_system_reset_request();
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break;
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case WDT_SHUTDOWN: /* same as 'system_powerdown' in monitor */
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qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_SHUTDOWN, &error_abort);
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qemu_system_powerdown_request();
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break;
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case WDT_POWEROFF: /* same as 'quit' command in monitor */
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qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_POWEROFF, &error_abort);
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exit(0);
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case WDT_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_EXPIRATION_ACTION_PAUSE, &error_abort);
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qemu_system_vmstop_request(RUN_STATE_WATCHDOG);
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break;
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case WDT_DEBUG:
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qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_DEBUG, &error_abort);
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fprintf(stderr, "watchdog: timer fired\n");
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break;
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case WDT_NONE:
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qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_NONE, &error_abort);
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break;
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}
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}
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