hv: reduce cyclomatic complexity of create_vm()

This commit extract pm io handler registration code to register_pm_io_handler()
to reduce the cyclomatic complexity of create_vm() in order to be complied with
MISRA-C rules.

Tracked-On: #3227
Signed-off-by: Yan, Like <like.yan@intel.com>

Author: lyan3

hypervisor/arch/x86/guest/vm.c

@@ -393,6 +393,21 @@ static void prepare_epc_vm_memmap(struct acrn_vm *vm)
 	}
 }
 
+static void register_pm_io_handler(struct acrn_vm *vm)
+{
+	if (is_sos_vm(vm)) {
+		/* Load pm S state data */
+		if (vm_load_pm_s_state(vm) == 0) {
+			register_pm1ab_handler(vm);
+		}
+	}
+
+	/* Intercept the virtual pm port for RTVM */
+	if (is_rt_vm(vm)) {
+		register_rt_vm_pm1a_ctl_handler(vm);
+	}
+}
+
 /**
  * @pre vm_id < CONFIG_MAX_VM_NUM && vm_config != NULL && rtn_vm != NULL
  * @pre vm->state == VM_POWERED_OFF
@@ -471,12 +486,8 @@ int32_t create_vm(uint16_t vm_id, struct acrn_vm_config *vm_config, struct acrn_
 
 		vm_setup_cpu_state(vm);
 
-		if (is_sos_vm(vm)) {
-			/* Load pm S state data */
-			if (vm_load_pm_s_state(vm) == 0) {
-				register_pm1ab_handler(vm);
-			}
-		}
+		register_pm_io_handler(vm);
+
 		if (!is_lapic_pt_configured(vm)) {
 			vpic_init(vm);
 		}
@@ -501,11 +512,6 @@ int32_t create_vm(uint16_t vm_id, struct acrn_vm_config *vm_config, struct acrn_
 			vioapic_init(vm);
 		}
 
-		/* Intercept the virtual pm port for RTVM */
-		if (is_rt_vm(vm)) {
-			register_rt_vm_pm1a_ctl_handler(vm);
-		}
-
 		/* Populate return VM handle */
 		*rtn_vm = vm;
 		vm->sw.io_shared_page = NULL;