KVM: s390: set the prefix initially properly

When KVM_RUN is triggered on a VCPU without an initial reset, a
validity intercept occurs.
Setting the prefix will set the KVM_REQ_MMU_RELOAD bit initially,
thus preventing the bug.

Reviewed-by: David Hildenbrand <[e-mail]>
Acked-by: Cornelia Huck <[e-mail]>
Signed-off-by: Julius Niedworok <[e-mail]>
Signed-off-by: Christian Borntraeger <[e-mail]>

arch/s390/kvm/kvm-s390.c

···
 				    KVM_SYNC_CRS |
 				    KVM_SYNC_ARCH0 |
 				    KVM_SYNC_PFAULT;
+	kvm_s390_set_prefix(vcpu, 0);
 	if (test_kvm_facility(vcpu->kvm, 64))
 		vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
 	/* fprs can be synchronized via vrs, even if the guest has no vx. With