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From c2c11da318c64a43bb0ed7d07f329d2f1816eb3f Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Fri, 29 Mar 2019 11:13:37 +0000
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Subject: [PATCH 3/7] redhat: s390x/cpumodel: enable mepoch by default for z14
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GA2
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RH-Author: Thomas Huth <thuth@redhat.com>
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Message-id: <1553858017-376-4-git-send-email-thuth@redhat.com>
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Patchwork-id: 85240
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O-Subject: [RHEL-8.1.0 qemu-kvm PATCH 3/3] redhat: s390x/cpumodel: enable mepoch by default for z14 GA2
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Bugzilla: 1664371
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Jens Freimann <jfreimann@redhat.com>
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Upstream-status: n/a (downstream only)
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Enable the mepoch feature for the new z14 GA2 CPU model. In upstream
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QEMU, this feature has already been enabled by default for the GA1
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CPU model in new machine types, too:
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84176c7906ffaf59457bd7dff25a3ea32e00c3d8
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"s390x/cpumodel: default enable mepoch for z14 and later"
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But since we do not have new machine types in RHEL8 qemu-kvm yet,
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we can not play the trick with the machine type here and thus can
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only enable mepoch for the new z14 GA2 CPU. Users of the z14 GA1
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CPU will have to enable this feature manually.
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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target/s390x/gen-features.c | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c
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index dee8375..739d5f1 100644
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--- a/target/s390x/gen-features.c
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+++ b/target/s390x/gen-features.c
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@@ -556,7 +556,15 @@ static uint16_t default_GEN14_GA1[] = {
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S390_FEAT_GROUP_MSA_EXT_8,
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};
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-#define default_GEN14_GA2 EmptyFeat
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+/*
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+ * Red Hat only: We enable the MULTIPLE_EPOCH features only for z14 GA2 and
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+ * not for GA1 already, since we do not have a new s390-ccw-virtio-rhel8.y.0
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+ * machine type for applying upstream commit 84176c7906ffaf59457bd7 correctly.
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+ */
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+static uint16_t default_GEN14_GA2[] = {
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+ S390_FEAT_MULTIPLE_EPOCH,
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+ S390_FEAT_GROUP_MULTIPLE_EPOCH_PTFF,
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+};
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/* QEMU (CPU model) features */
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--
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1.8.3.1
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