[PULL v3 37/41] pvpanic: Emit GUEST_PVSHUTDOWN QMP event on pvpanic shutdown signal

["Michael S. Tsirkin" <mst@redhat.com>]

From: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>

Emit a QMP event on receiving a PVPANIC_SHUTDOWN event. Even though a typical
SHUTDOWN event will be sent, it will be indistinguishable from a shutdown
originating from other cases (e.g. KVM exit due to KVM_SYSTEM_EVENT_SHUTDOWN)
that also issue the guest-shutdown cause.
A management layer application can detect the new GUEST_PVSHUTDOWN event to
determine if the guest is using the pvpanic interface to request shutdowns.

Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Message-Id: <20240527-pvpanic-shutdown-v8-6-5a28ec02558b@t-8ch.de>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 qapi/run-state.json | 14 ++++++++++++++
 system/runstate.c   |  1 +
 2 files changed, 15 insertions(+)

diff --git a/qapi/run-state.json b/qapi/run-state.json
index f8773f23b2..5ac0fec852 100644
--- a/qapi/run-state.json
+++ b/qapi/run-state.json
@@ -462,6 +462,20 @@
 { 'event': 'GUEST_CRASHLOADED',
   'data': { 'action': 'GuestPanicAction', '*info': 'GuestPanicInformation' } }
 
+##
+# @GUEST_PVSHUTDOWN:
+#
+# Emitted when guest submits a shutdown request via pvpanic interface
+#
+# Since: 9.1
+#
+# Example:
+#
+#     <- { "event": "GUEST_PVSHUTDOWN",
+#          "timestamp": { "seconds": 1648245259, "microseconds": 893771 } }
+##
+{ 'event': 'GUEST_PVSHUTDOWN' }
+
 ##
 # @GuestPanicAction:
 #
diff --git a/system/runstate.c b/system/runstate.c
index 83055f3278..c149b1ab4b 100644
--- a/system/runstate.c
+++ b/system/runstate.c
@@ -587,6 +587,7 @@ void qemu_system_guest_crashloaded(GuestPanicInformation *info)
 
 void qemu_system_guest_pvshutdown(void)
 {
+    qapi_event_send_guest_pvshutdown();
     qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
 }
 
-- 
MST