HV: Add has_rt_vm API

The has_rt_vm walk through all VMs to check RT VM flag and if
there is no any RT VM, then return false otherwise return true.

Signed-off-by: Jack Ren <jack.ren@intel.com>
Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Reviewed-by: Li, Fei1 <fei1.li@intel.com>

Author: yliu80

hypervisor/arch/x86/guest/vm.c

@@ -854,3 +854,19 @@ enum vm_vlapic_state check_vm_vlapic_state(const struct acrn_vm *vm)
 	vlapic_state = vm->arch_vm.vlapic_state;
 	return vlapic_state;
 }
+
+/**
+ * if there is RT VM return true otherwise return false.
+ */
+bool has_rt_vm(void)
+{
+	uint16_t vm_id;
+
+	for (vm_id = 0U; vm_id < CONFIG_MAX_VM_NUM; vm_id++) {
+		if (is_rt_vm(get_vm_from_vmid(vm_id))) {
+			break;
+		}
+	}
+
+	return ((vm_id == CONFIG_MAX_VM_NUM) ? false : true);
+}

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

@@ -224,6 +224,7 @@ void vrtc_init(struct acrn_vm *vm);
 
 bool is_lapic_pt_configured(const struct acrn_vm *vm);
 bool is_rt_vm(const struct acrn_vm *vm);
+bool has_rt_vm(void);
 bool is_highest_severity_vm(const struct acrn_vm *vm);
 bool vm_hide_mtrr(const struct acrn_vm *vm);
 void update_vm_vlapic_state(struct acrn_vm *vm);