[RFC PATCH 01/11] acpi: hmp/qmp: Add hmp/qmp support for system_sleep

[Annie Li <annie.li@oracle.com>]

Following hmp/qmp commands are implemented for pressing virtual
sleep button,

hmp: system_sleep
qmp: { "execute": "system_sleep" }

These commands put the guest into suspend or other power states
depending on the power settings inside the guest.

Signed-off-by: Annie Li <annie.li@oracle.com>
---
 hmp-commands.hx            | 14 ++++++++++++++
 hw/core/machine-hmp-cmds.c |  5 +++++
 hw/core/machine-qmp-cmds.c |  9 +++++++++
 include/monitor/hmp.h      |  1 +
 qapi/machine.json          | 18 ++++++++++++++++++
 qapi/pragma.json           |  1 +
 6 files changed, 48 insertions(+)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index 765349ed14..bd01e49ec5 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -652,6 +652,20 @@ SRST
   whether profiling is on or off.
 ERST
 
+    {
+        .name       = "system_sleep",
+        .args_type  = "",
+        .params     = "",
+        .help       = "send ACPI sleep event",
+        .cmd = hmp_system_sleep,
+    },
+
+SRST
+``system_sleep``
+  Push the virtual sleep button; if supported the system will enter
+  an ACPI sleep state.
+ERST
+
     {
         .name       = "system_reset",
         .args_type  = "",
diff --git a/hw/core/machine-hmp-cmds.c b/hw/core/machine-hmp-cmds.c
index a6ff6a4875..641a365e3e 100644
--- a/hw/core/machine-hmp-cmds.c
+++ b/hw/core/machine-hmp-cmds.c
@@ -185,6 +185,11 @@ void hmp_system_reset(Monitor *mon, const QDict *qdict)
     qmp_system_reset(NULL);
 }
 
+void hmp_system_sleep(Monitor *mon, const QDict *qdict)
+{
+    qmp_system_sleep(NULL);
+}
+
 void hmp_system_powerdown(Monitor *mon, const QDict *qdict)
 {
     qmp_system_powerdown(NULL);
diff --git a/hw/core/machine-qmp-cmds.c b/hw/core/machine-qmp-cmds.c
index 3860a50c3b..9f1e636c90 100644
--- a/hw/core/machine-qmp-cmds.c
+++ b/hw/core/machine-qmp-cmds.c
@@ -257,6 +257,15 @@ void qmp_system_reset(Error **errp)
     qemu_system_reset_request(SHUTDOWN_CAUSE_HOST_QMP_SYSTEM_RESET);
 }
 
+void qmp_system_sleep(Error **errp)
+{
+    if (!qemu_wakeup_suspend_enabled()) {
+        error_setg(errp,
+                   "suspend from running is not supported by this guest");
+        return;
+    }
+}
+
 void qmp_system_powerdown(Error **errp)
 {
     qemu_system_powerdown_request();
diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h
index 13f9a2dedb..d72a3b775c 100644
--- a/include/monitor/hmp.h
+++ b/include/monitor/hmp.h
@@ -45,6 +45,7 @@ void hmp_quit(Monitor *mon, const QDict *qdict);
 void hmp_stop(Monitor *mon, const QDict *qdict);
 void hmp_sync_profile(Monitor *mon, const QDict *qdict);
 void hmp_system_reset(Monitor *mon, const QDict *qdict);
+void hmp_system_sleep(Monitor *mon, const QDict *qdict);
 void hmp_system_powerdown(Monitor *mon, const QDict *qdict);
 void hmp_exit_preconfig(Monitor *mon, const QDict *qdict);
 void hmp_announce_self(Monitor *mon, const QDict *qdict);
diff --git a/qapi/machine.json b/qapi/machine.json
index b6d634b30d..3ac69df92f 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -297,6 +297,24 @@
 ##
 { 'command': 'system_reset' }
 
+##
+# @system_sleep:
+#
+# Requests that a guest perform a ACPI sleep transition by pushing a virtual
+# sleep button.
+#
+# Notes: A guest may or may not respond to this command. This command
+#        returning does not indicate that a guest has accepted the request
+#        or that it has gone to sleep.
+#
+# Example:
+#
+# -> { "execute": "system_sleep" }
+# <- { "return": {} }
+#
+##
+{ 'command': 'system_sleep' }
+
 ##
 # @system_powerdown:
 #
diff --git a/qapi/pragma.json b/qapi/pragma.json
index 0aa4eeddd3..ef15229854 100644
--- a/qapi/pragma.json
+++ b/qapi/pragma.json
@@ -23,6 +23,7 @@
         'set_password',
         'system_powerdown',
         'system_reset',
+        'system_sleep',
         'system_wakeup' ],
     # Commands allowed to return a non-dictionary
     'command-returns-exceptions': [
-- 
2.34.3