[PATCH 4.15 103/122] KVM: s390: consider epoch index on hotplugged CPUs

[Greg Kroah-Hartman]

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Hildenbrand <david@xxxxxxxxxx>

commit d16b52cb9cdb6f06dea8ab2f0a428e7d7f0b0a81 upstream.

We must copy both, the epoch and the epoch_idx.

Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Message-Id: <20180207114647.6220-4-david@xxxxxxxxxx>
Fixes: 8fa1696ea781 ("KVM: s390: Multiple Epoch Facility support")
Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Fixes: 8fa1696ea781 ("KVM: s390: Multiple Epoch Facility support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/s390/kvm/kvm-s390.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2359,6 +2359,7 @@ void kvm_arch_vcpu_postcreate(struct kvm
 	mutex_lock(&vcpu->kvm->lock);
 	preempt_disable();
 	vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
+	vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx;
 	preempt_enable();
 	mutex_unlock(&vcpu->kvm->lock);
 	if (!kvm_is_ucontrol(vcpu->kvm)) {