x86/ipipe: kvm: Deregister preemption notifier on interrupted VM entry

Otherwise, it may fire incorrectly, causing undesired side effects.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

arch/x86/kvm/x86.c

@@ -6639,6 +6639,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 	    || need_resched() || signal_pending(current)) {
 		vcpu->mode = OUTSIDE_GUEST_MODE;
 		smp_wmb();
+		__ipipe_exit_vm();
 		hard_cond_local_irq_enable();
 		local_irq_enable();
 		preempt_enable();