hv: vm_event: send event on triple fault handler

In the triple fault handler, post-launched VMs are instantly turned
off. Now a vm event is generated simultaneously. So that
developers can capture the event and decide what to do with it. (e.g.,
logging and populating diagnostics, or poweroff VM)

Tracked-On: projectacrn#8547
Signed-off-by: Wu Zhou <wu.zhou@intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>

hypervisor/arch/x86/guest/vm_reset.c

@@ -10,13 +10,15 @@
 #include <logmsg.h>
 #include <asm/per_cpu.h>
 #include <asm/guest/vm_reset.h>
+#include <vm_event.h>
 
 /**
  * @pre vm != NULL
  */
 void triple_fault_shutdown_vm(struct acrn_vcpu *vcpu)
 {
 	struct acrn_vm *vm = vcpu->vm;
+	struct vm_event trp_event;
 
 	if (is_postlaunched_vm(vm)) {
 		struct io_request *io_req = &vcpu->req;
@@ -28,6 +30,10 @@ void triple_fault_shutdown_vm(struct acrn_vcpu *vcpu)
 		io_req->reqs.pio_request.size = 2UL;
 		io_req->reqs.pio_request.value = (VIRTUAL_PM1A_SLP_EN | (5U << 10U));
 
+		/* Send the tripple fault event to DM. */
+		trp_event.type = VM_EVENT_TRIPLE_FAULT;
+		(void)send_vm_event(vcpu->vm, &trp_event);
+
 		/* Inject pm1a S5 request to Service VM to shut down the guest */
 		(void)emulate_io(vcpu, io_req);
 	} else {