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From 49a0dc9e670b7f67713a7f9115028a4a29fbd03b Mon Sep 17 00:00:00 2001
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From: Cornelia Huck <cohuck@redhat.com>
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Date: Thu, 5 Oct 2017 12:04:05 +0200
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Subject: [PATCH 11/34] s390x/ais: for 2.10 stable: disable ais facility
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RH-Author: Cornelia Huck <cohuck@redhat.com>
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Message-id: <20171005120406.16642-2-cohuck@redhat.com>
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Patchwork-id: 76818
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O-Subject: [RHV7.5 qemu-kvm-ma PATCH 1/2] s390x/ais: for 2.10 stable: disable ais facility
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Bugzilla: 1494548
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Jens Freimann <jfreimann@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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From: Christian Borntraeger <borntraeger@de.ibm.com>
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The migration interface for ais was introduced with kernel 4.13
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but the capability itself had been active since 4.12. As migration
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support is considered necessary lets disable ais in the 2.10
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stable version. A proper fix and re-enablement will be done
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for qemu 2.11.
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Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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Message-Id: <20170921140834.14233-2-borntraeger@de.ibm.com>
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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(cherry picked from commit 3f2d07b3b01ea61126b382633ab4006320923048)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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target/s390x/kvm.c | 9 +++++++--
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1 file changed, 7 insertions(+), 2 deletions(-)
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diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
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index c4c5791..eb0dbb3 100644
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--- a/target/s390x/kvm.c
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+++ b/target/s390x/kvm.c
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@@ -308,8 +308,13 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
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}
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}
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- /* Try to enable AIS facility */
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- kvm_vm_enable_cap(s, KVM_CAP_S390_AIS, 0);
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+ /*
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+ * The migration interface for ais was introduced with kernel 4.13
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+ * but the capability itself had been active since 4.12. As migration
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+ * support is considered necessary let's disable ais in the 2.10
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+ * machine.
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+ */
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+ /* kvm_vm_enable_cap(s, KVM_CAP_S390_AIS, 0); */
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qemu_mutex_init(&qemu_sigp_mutex);
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--
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1.8.3.1
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