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-rw-r--r--arch/x86/kvm/hyperv.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 5ff3485acb60..01bd7b7a6866 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1116,6 +1116,11 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
break;
case HVCALL_POST_MESSAGE:
case HVCALL_SIGNAL_EVENT:
+ /* don't bother userspace if it has no way to handle it */
+ if (!vcpu_to_synic(vcpu)->active) {
+ res = HV_STATUS_INVALID_HYPERCALL_CODE;
+ break;
+ }
vcpu->run->exit_reason = KVM_EXIT_HYPERV;
vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
vcpu->run->hyperv.u.hcall.input = param;