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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>