add triple fault request support

if vcpu meet triple fault, the vcpu should exit.

Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Tian, Kevin <kevin.tian@intel.com>

Author: JasonChenCJ

hypervisor/arch/x86/interrupt.c

@@ -304,6 +304,11 @@ int acrn_handle_pending_request(struct vcpu *vcpu)
 	bool intr_pending = false;
 	uint64_t *pending_req_bits = &vcpu->arch_vcpu.pending_req;
 
+	if (bitmap_test_and_clear(ACRN_REQUEST_TRP_FAULT, pending_req_bits)) {
+		pr_fatal("Triple fault happen -> shutdown!");
+		return -EFAULT;
+	}
+
 	if (bitmap_test_and_clear(ACRN_REQUEST_TLB_FLUSH, pending_req_bits))
 		invept(vcpu);
 

hypervisor/common/hv_main.c

@@ -64,7 +64,12 @@ void vcpu_thread(struct vcpu *vcpu)
 		CPU_IRQ_DISABLE();
 
 		/* Check and process pending requests(including interrupt) */
-		acrn_handle_pending_request(vcpu);
+		ret = acrn_handle_pending_request(vcpu);
+		if (ret < 0) {
+			pr_fatal("vcpu handling pending request fail");
+			pause_vcpu(vcpu, VCPU_ZOMBIE);
+			continue;
+		}
 
 		if (need_rescheduled(vcpu->pcpu_id)) {
 			/*

hypervisor/include/arch/x86/guest/guest.h

@@ -70,6 +70,7 @@ int get_req_info(char *str, int str_max);
 #define ACRN_REQUEST_GP 3
 #define	ACRN_REQUEST_TMR_UPDATE 4
 #define	ACRN_REQUEST_TLB_FLUSH 5
+#define	ACRN_REQUEST_TRP_FAULT 6
 
 #define E820_MAX_ENTRIES    32
 

hypervisor/include/lib/errno.h

@@ -41,5 +41,7 @@
 #define EIO                4
 /** Indicates that target is busy. */
 #define EBUSY              5
+/** Indicates there is fault. */
+#define EFAULT             6
 
 #endif /* ERRNO_H */