HV: Use the variable to fire VHM interrupt

This is to do the preparation of switch the notifier vector from
PLATFORM_IPI to HYPERVISOR_CALLBACK_VECTOR.

Currently the acrn-hypervisor is using the PLATFORM_IPI vector to notify
the sos_kernel. And then sos_kernel will handle the notification from acrn
hypervisor in PLATFORM_IPI ISR. But as the PLATFORM_IPI ISR can be registered
by the other modules, it will have the conflict when trying to register
acrn intr ISR. So the HYPERVISOR_CALLBACK_VECTOR will be used instead.

Tracked-On: #1325
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: yakuizhao

hypervisor/common/io_request.c

@@ -7,6 +7,8 @@
 
 #define ACRN_DBG_IOREQUEST	6U
 
+uint32_t acrn_vhm_vector = VECTOR_VIRT_IRQ_VHM;
+
 static void fire_vhm_interrupt(void)
 {
 	/*
@@ -22,7 +24,7 @@ static void fire_vhm_interrupt(void)
 	vcpu = vcpu_from_vid(vm0, 0U);
 	ASSERT(vcpu != NULL, "vcpu_from_vid failed");
 
-	vlapic_intr_edge(vcpu, VECTOR_VIRT_IRQ_VHM);
+	vlapic_intr_edge(vcpu, acrn_vhm_vector);
 }
 
 static void acrn_print_request(uint16_t vcpu_id, struct vhm_request *req)

hypervisor/include/arch/x86/irq.h

@@ -121,4 +121,6 @@ void cancel_event_injection(struct vcpu *vcpu);
 void get_cpu_interrupt_info(char *str_arg, int str_max);
 #endif /* HV_DEBUG */
 
+extern uint32_t acrn_vhm_vector;
+
 #endif /* ARCH_IRQ_H */