diff --git a/hypervisor/arch/x86/cpu.c b/hypervisor/arch/x86/cpu.c
index ee9f70e53..20bda6ecd 100644
--- a/hypervisor/arch/x86/cpu.c
+++ b/hypervisor/arch/x86/cpu.c
@@ -232,11 +232,12 @@ void init_pcpu_post(uint16_t pcpu_id)
 		ptdev_init();
 
 		/* Start all secondary cores */
+#if 		0
 		startup_paddr = prepare_trampoline();
 		if (!start_pcpus(AP_MASK)) {
 			panic("Failed to start all secondary cores!");
 		}
-
+#endif
 		ASSERT(get_pcpu_id() == BOOT_CPU_ID, "");
 	} else {
 		pr_dbg("Core %hu is up", pcpu_id);
@@ -313,6 +314,14 @@ bool start_pcpus(uint64_t mask)
 	uint16_t pcpu_id = get_pcpu_id();
 	uint64_t expected_start_mask = mask;
 
+	if ((pcpu_active_bitmap & mask) == mask)
+		return 1;
+
+#if 1
+	if (startup_paddr == 0)
+		startup_paddr = prepare_trampoline();
+#endif
+
 	/* secondary cpu start up will wait for pcpu_sync -> 0UL */
 	atomic_store64(&pcpu_sync, 1UL);
 
diff --git a/hypervisor/arch/x86/guest/vlapic.c b/hypervisor/arch/x86/guest/vlapic.c
index 44f74a78a..f99f7a7ad 100644
--- a/hypervisor/arch/x86/guest/vlapic.c
+++ b/hypervisor/arch/x86/guest/vlapic.c
@@ -1201,6 +1201,7 @@ vlapic_process_init_sipi(struct acrn_vcpu* target_vcpu, uint32_t mode,
 			target_vcpu->arch.nr_sipi = 1U;
 		}
 	} else if (mode == APIC_DELMODE_STARTUP) {
+		
 		/* Ignore SIPIs in any state other than wait-for-SIPI */
 		if ((target_vcpu->state == VCPU_INIT) &&
 			(target_vcpu->arch.nr_sipi != 0U)) {
@@ -1259,6 +1260,11 @@ static void vlapic_icrlo_write_handler(struct acrn_vlapic *vlapic)
 	} else if (((shorthand == APIC_DEST_SELF) || (shorthand == APIC_DEST_ALLISELF))
 			&& ((mode == APIC_DELMODE_NMI) || (mode == APIC_DELMODE_INIT)
 			|| (mode == APIC_DELMODE_STARTUP))) {
+
+#if		1
+			/* Start all secondary cores */
+			start_pcpus(AP_MASK);
+#endif
 			dev_dbg(ACRN_DBG_LAPIC, "Invalid ICR value");
 	} else {
 
@@ -1268,6 +1274,10 @@ static void vlapic_icrlo_write_handler(struct acrn_vlapic *vlapic)
 
 		switch (shorthand) {
 		case APIC_DEST_DESTFLD:
+#if		1
+			/* Start all secondary cores */
+			start_pcpus(AP_MASK);
+#endif
 			vlapic_calc_dest(vlapic->vm, &dmask, is_broadcast, dest, phys, false);
 			break;
 		case APIC_DEST_SELF: