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[Qemu-devel] [RFC 21/28] s390x/kvm: disable host model for existing comp

From: David Hildenbrand
Subject: [Qemu-devel] [RFC 21/28] s390x/kvm: disable host model for existing compat machines
Date: Tue, 21 Jun 2016 15:02:26 +0200

Compatibility machines that touch runtime-instrumentation should not
be used with the CPU model. Otherwise the host model will look different,
depending on the QEMU machine QEMU has been started with.

So let's simply disable the host model for existing compatibility machines
that all disable ri.

Acked-by: Cornelia Huck <address@hidden>
Signed-off-by: David Hildenbrand <address@hidden>
 target-s390x/kvm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
index 6002cf9..a4f5762 100644
--- a/target-s390x/kvm.c
+++ b/target-s390x/kvm.c
@@ -2440,6 +2440,10 @@ static int configure_cpu_feat(const S390FeatBitmap 
 bool kvm_s390_cpu_models_supported(void)
+    if (!ri_allowed()) {
+        /* compatibility machines interfere with the cpu model */
+        return false;
+    }
     return kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,
                              KVM_S390_VM_CPU_MACHINE) &&
            kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,

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