diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 13bfa4e0b93dba96b52adf32d7021cb1c7ca5283..293619998c3855c2a87a3d75ab986fd5497ec4f7 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2099,6 +2099,8 @@ static bool hv_check_hypercall_access(struct kvm_vcpu_hv *hv_vcpu, u16 code)
 	case HVCALL_NOTIFY_LONG_SPIN_WAIT:
 		return hv_vcpu->cpuid_cache.enlightenments_ebx &&
 			hv_vcpu->cpuid_cache.enlightenments_ebx != U32_MAX;
+	case HVCALL_POST_MESSAGE:
+		return hv_vcpu->cpuid_cache.features_ebx & HV_POST_MESSAGES;
 	default:
 		break;
 	}