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

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Message-Id: <20180307191744.368559705@linuxfoundation.org>
Date:   Wed,  7 Mar 2018 11:38:35 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Hildenbrand <david@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: [PATCH 4.15 103/122] KVM: s390: consider epoch index on hotplugged CPUs

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

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

From: David Hildenbrand <david@...hat.com>

commit d16b52cb9cdb6f06dea8ab2f0a428e7d7f0b0a81 upstream.

We must copy both, the epoch and the epoch_idx.

Signed-off-by: David Hildenbrand <david@...hat.com>
Message-Id: <20180207114647.6220-4-david@...hat.com>
Fixes: 8fa1696ea781 ("KVM: s390: Multiple Epoch Facility support")
Reviewed-by: Cornelia Huck <cohuck@...hat.com>
Reviewed-by: Christian Borntraeger <borntraeger@...ibm.com>
Fixes: 8fa1696ea781 ("KVM: s390: Multiple Epoch Facility support")
Cc: stable@...r.kernel.org
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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)) {