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Tue, 08 Dec 2020 19:14:58 +0000 Received: from abhmp0015.oracle.com (abhmp0015.oracle.com [141.146.116.21]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0B8JEvaH017802; Tue, 8 Dec 2020 19:14:57 GMT Received: from ban25x6uut148.us.oracle.com (/10.153.73.148) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 08 Dec 2020 11:14:57 -0800 From: Alejandro Jimenez To: qemu-devel@nongnu.org Subject: [PATCH 1/4] vl: Add an -action option to respond to guest events Date: Tue, 8 Dec 2020 14:14:47 -0500 Message-Id: <1607454890-3339-2-git-send-email-alejandro.j.jimenez@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1607454890-3339-1-git-send-email-alejandro.j.jimenez@oracle.com> References: <1607454890-3339-1-git-send-email-alejandro.j.jimenez@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9829 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 malwarescore=0 adultscore=0 bulkscore=0 phishscore=0 suspectscore=1 mlxscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012080117 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9829 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 mlxlogscore=999 clxscore=1015 malwarescore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 phishscore=0 spamscore=0 impostorscore=0 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012080117 Received-SPF: pass client-ip=156.151.31.86; envelope-from=alejandro.j.jimenez@oracle.com; helo=userp2130.oracle.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pbonzini@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Several command line options currently in use are meant to modify the behavior of QEMU in response to certain guest events like: -no-reboot, -no-shutdown, -watchdog-action. These can be grouped into a single option of the form: -action event=action Which can be used to specify the existing options above in the following format: -action reboot=none|shutdown -action shutdown=poweroff|pause -action watchdog=reset|shutdown|poweroff|pause|debug|none|inject-nmi This is done in preparation for adding yet another option of this type, which modifies the QEMU behavior when a guest panic occurs. Suggested-by: Paolo Bonzini Signed-off-by: Alejandro Jimenez Reviewed-by: David Edmondson Reviewed-by: Liam Merwick --- MAINTAINERS | 2 + include/sysemu/runstate-action.h | 16 +++++ include/sysemu/sysemu.h | 1 + qapi/run-state.json | 88 ++++++++++++++++++++++++++ qemu-options.hx | 22 +++++++ softmmu/meson.build | 1 + softmmu/runstate-action.c | 131 +++++++++++++++++++++++++++++++++++++++ softmmu/vl.c | 30 ++++++++- 8 files changed, 290 insertions(+), 1 deletion(-) create mode 100644 include/sysemu/runstate-action.h create mode 100644 softmmu/runstate-action.c diff --git a/MAINTAINERS b/MAINTAINERS index 68bc160..7dcc4bd 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2332,6 +2332,7 @@ M: Paolo Bonzini S: Maintained F: include/qemu/main-loop.h F: include/sysemu/runstate.h +F: include/sysemu/runstate-action.h F: util/main-loop.c F: util/qemu-timer.c F: softmmu/vl.c @@ -2340,6 +2341,7 @@ F: softmmu/cpus.c F: softmmu/cpu-throttle.c F: softmmu/cpu-timers.c F: softmmu/icount.c +F: softmmu/runstate-action.c F: qapi/run-state.json Read, Copy, Update (RCU) diff --git a/include/sysemu/runstate-action.h b/include/sysemu/runstate-action.h new file mode 100644 index 0000000..f545ab3 --- /dev/null +++ b/include/sysemu/runstate-action.h @@ -0,0 +1,16 @@ +/* + * Copyright (c) 2020 Oracle and/or its affiliates. + * + * This work is licensed under the terms of the GNU GPL, version 2. + * See the COPYING file in the top-level directory. + * + */ + +#ifndef RUNSTATE_ACTION_H +#define RUNSTATE_ACTION_H + +/* in softmmu/runstate-action.c */ +int process_runstate_actions(void *opaque, QemuOpts *opts, Error **errp); +int runstate_action_parse(QemuOptsList *opts_list, const char *optarg); + +#endif /* RUNSTATE_ACTION_H */ diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h index 817ff4c..5480e61 100644 --- a/include/sysemu/sysemu.h +++ b/include/sysemu/sysemu.h @@ -43,6 +43,7 @@ extern int win2k_install_hack; extern int alt_grab; extern int ctrl_grab; extern int graphic_rotate; +extern int no_reboot; extern int no_shutdown; extern int old_param; extern int boot_menu; diff --git a/qapi/run-state.json b/qapi/run-state.json index 964c8ef..6b033c1 100644 --- a/qapi/run-state.json +++ b/qapi/run-state.json @@ -329,6 +329,94 @@ 'inject-nmi' ] } ## +# @RunStateEventType: +# +# An enumeration of Run State event types +# +# @reboot: Guest reboot +# +# @shutdown: Guest shutdown +# +# @watchdog: A watchdog device's timer has expired +# +# Since: 6.0 +## +{ 'enum': 'RunStateEventType', + 'data': [ 'reboot', 'shutdown', 'watchdog' ] } + +## +# @RunStateAction: +# +# Describes a guest event and the subsequent action that is taken +# by QEMU when such event takes place. +# +# Since: 6.0 +## +{ 'union': 'RunStateAction', + 'base': { 'event': 'RunStateEventType' }, + 'discriminator': 'event', + 'data': { + 'reboot': 'RunStateRebootAction', + 'shutdown': 'RunStateShutdownAction', + 'watchdog': 'RunStateWatchdogAction' } } + +## +# @RunStateRebootAction: +# +# @action: Action taken by QEMU when guest reboots +# +# Since: 6.0 +## +{ 'struct': 'RunStateRebootAction', + 'data': { 'action': 'RebootAction' } } + +## +# @RebootAction: +# +# Possible QEMU actions upon guest reboot +# +# @none: Reset the VM +# +# @shutdown: Shutdown the VM and exit +# +# Since: 6.0 +## +{ 'enum': 'RebootAction', + 'data': [ 'none', 'shutdown' ] } + +## +# @RunStateShutdownAction: +# +# @action: Action taken by QEMU when guest shuts down +# +# Since: 6.0 +## +{ 'struct': 'RunStateShutdownAction', + 'data': { 'action': 'ShutdownAction' } } + +## +# @ShutdownAction: +# +# @pause: pause the VM +# +# @poweroff: Shutdown the VM and exit +# +# Since: 6.0 +## +{ 'enum': 'ShutdownAction', + 'data': [ 'pause', 'poweroff' ] } + +## +# @RunStateWatchdogAction: +# +# @action: Action taken by QEMU when watchdog device timer expires +# +# Since: 6.0 +## +{ 'struct': 'RunStateWatchdogAction', + 'data': { 'action': 'WatchdogAction' } } + +## # @watchdog-set-action: # # Set watchdog action diff --git a/qemu-options.hx b/qemu-options.hx index 104632e..a0d50f0 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -3894,6 +3894,28 @@ SRST changes to the disk image. ERST +DEF("action", HAS_ARG, QEMU_OPTION_action, + "-action reboot=none|shutdown\n" + " action when guest reboots [default=none]\n" + "-action shutdown=poweroff|pause\n" + " action when guest shuts down [default=poweroff]\n" + "-action watchdog=reset|shutdown|poweroff|inject-nmi|pause|debug|none\n" + " action when watchdog fires [default=reset]\n", + QEMU_ARCH_ALL) +SRST +``-action event=action`` + The action parameter serves to modify QEMU's default behavior when + certain guest events occur. It provides a generic method for specifying the + same behaviors that are modified by the ``-no-reboot`` and ``-no-shutdown`` + parameters. + + Examples: + + ``-action reboot=shutdown,shutdown=pause`` + ``-watchdog i6300esb -action watchdog=pause`` + +ERST + DEF("loadvm", HAS_ARG, QEMU_OPTION_loadvm, \ "-loadvm [tag|id]\n" \ " start right away with a saved state (loadvm in monitor)\n", diff --git a/softmmu/meson.build b/softmmu/meson.build index 8f7210b..8ad586e 100644 --- a/softmmu/meson.build +++ b/softmmu/meson.build @@ -10,6 +10,7 @@ specific_ss.add(when: 'CONFIG_SOFTMMU', if_true: [files( 'qtest.c', 'vl.c', 'cpu-timers.c', + 'runstate-action.c', )]) specific_ss.add(when: ['CONFIG_SOFTMMU', 'CONFIG_TCG'], if_true: [files( diff --git a/softmmu/runstate-action.c b/softmmu/runstate-action.c new file mode 100644 index 0000000..bbbbc07 --- /dev/null +++ b/softmmu/runstate-action.c @@ -0,0 +1,131 @@ +/* + * Copyright (c) 2020 Oracle and/or its affiliates. + * + * This work is licensed under the terms of the GNU GPL, version 2. + * See the COPYING file in the top-level directory. + * + */ + +#include "qemu/osdep.h" +#include "sysemu/runstate-action.h" +#include "sysemu/sysemu.h" +#include "sysemu/watchdog.h" +#include "qemu/config-file.h" +#include "qapi/error.h" +#include "qemu/option_int.h" +#include "qapi/qapi-commands-run-state.h" + +static void runstate_action_help(void) +{ + int idx; + + printf("Events for which an action can be specified:\n"); + for (idx = 0; idx < RUN_STATE_EVENT_TYPE__MAX; idx++) { + printf("%10s\n", RunStateEventType_str(idx)); + } +} + +/* + * Set the internal state to react to a guest reboot event + * as specified by the action parameter. + */ +static void qmp_reboot_set_action(RebootAction act, Error **errp) +{ + switch (act) { + case REBOOT_ACTION_NONE: + no_reboot = 0; + break; + case REBOOT_ACTION_SHUTDOWN: + no_reboot = 1; + break; + default: + g_assert_not_reached(); + } +} + +/* + * Set the internal state to react to a guest shutdown event + * as specified by the action parameter. + */ +static void qmp_shutdown_set_action(ShutdownAction act, Error **errp) +{ + switch (act) { + case SHUTDOWN_ACTION_PAUSE: + no_shutdown = 1; + break; + case SHUTDOWN_ACTION_POWEROFF: + no_shutdown = 0; + break; + default: + g_assert_not_reached(); + } +} + +/* + * Process an event|action pair and set the appropriate internal + * state if event and action are valid. + */ +static int set_runstate_action(void *opaque, const char *event, + const char *action, Error **errp) +{ + int event_idx, act_idx; + + event_idx = qapi_enum_parse(&RunStateEventType_lookup, event, -1, errp); + + switch (event_idx) { + case RUN_STATE_EVENT_TYPE_REBOOT: + act_idx = qapi_enum_parse(&RebootAction_lookup, action, -1, errp); + qmp_reboot_set_action(act_idx, NULL); + break; + case RUN_STATE_EVENT_TYPE_SHUTDOWN: + act_idx = qapi_enum_parse(&ShutdownAction_lookup, action, -1, errp); + qmp_shutdown_set_action(act_idx, NULL); + break; + case RUN_STATE_EVENT_TYPE_WATCHDOG: + if (select_watchdog_action(action) == -1) { + error_report("unknown watchdog action parameter"); + exit(1); + } + break; + default: + /* + * The event and action types are checked for validity in the calls to + * qapi_enum_parse(), which will cause an exit if the requested event or + * action are invalid, since error_fatal is used as the error parameter. + * This case is unreachable unless those conditions change. + */ + g_assert_not_reached(); + } + + return 0; +} + +/* + * Parse provided -action arguments from cmdline. + */ +int runstate_action_parse(QemuOptsList *opts_list, const char *optarg) +{ + QemuOpts *opts; + + if (!strcmp(optarg, "help")) { + runstate_action_help(); + return -1; + } + + opts = qemu_opts_parse_noisily(opts_list, optarg, false); + if (!opts) { + return -1; + } + return 0; +} + +/* + * Process all the -action parameters parsed from cmdline. + */ +int process_runstate_actions(void *opaque, QemuOpts *opts, Error **errp) +{ + if (qemu_opt_foreach(opts, set_runstate_action, NULL, errp)) { + return -1; + } + return 0; +} diff --git a/softmmu/vl.c b/softmmu/vl.c index e6e0ad5..2b1583e 100644 --- a/softmmu/vl.c +++ b/softmmu/vl.c @@ -34,6 +34,7 @@ #include "qemu/uuid.h" #include "sysemu/reset.h" #include "sysemu/runstate.h" +#include "sysemu/runstate-action.h" #include "sysemu/seccomp.h" #include "sysemu/tcg.h" #include "sysemu/xen.h" @@ -147,7 +148,7 @@ Chardev *parallel_hds[MAX_PARALLEL_PORTS]; int win2k_install_hack = 0; int singlestep = 0; int fd_bootchk = 1; -static int no_reboot; +int no_reboot; int no_shutdown = 0; int graphic_rotate = 0; const char *watchdog; @@ -506,6 +507,21 @@ static QemuOptsList qemu_fw_cfg_opts = { }, }; +static QemuOptsList qemu_action_opts = { + .name = "action", + /* + * When lists are merged, the location is set to the first use of the + * option. If a subsequent option has an invalid parameter, the error msg + * will display the wrong location. Avoid this by not merging the lists. + */ + .merge_lists = false, + .head = QTAILQ_HEAD_INITIALIZER(qemu_action_opts.head), + .desc = { + /* Validation is done when processing the runstate actions */ + { } + }, +}; + /** * Get machine options * @@ -2948,6 +2964,7 @@ void qemu_init(int argc, char **argv, char **envp) qemu_add_opts(&qemu_icount_opts); qemu_add_opts(&qemu_semihosting_config_opts); qemu_add_opts(&qemu_fw_cfg_opts); + qemu_add_opts(&qemu_action_opts); module_call_init(MODULE_INIT_OPTS); runstate_init(); @@ -3420,6 +3437,12 @@ void qemu_init(int argc, char **argv, char **envp) } watchdog = optarg; break; + case QEMU_OPTION_action: + if (runstate_action_parse(qemu_find_opts("action"), + optarg) < 0) { + exit(1); + } + break; case QEMU_OPTION_watchdog_action: if (select_watchdog_action(optarg) == -1) { error_report("unknown -watchdog-action parameter"); @@ -3902,6 +3925,11 @@ void qemu_init(int argc, char **argv, char **envp) qemu_opts_foreach(qemu_find_opts("name"), parse_name, NULL, &error_fatal); + if (qemu_opts_foreach(qemu_find_opts("action"), + process_runstate_actions, NULL, &error_fatal)) { + exit(1); + } + #ifndef _WIN32 qemu_opts_foreach(qemu_find_opts("add-fd"), parse_add_fd, NULL, &error_fatal);