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s390x/cpu topology: add max_threads machine class attribute

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The S390 CPU topology accepts the smp.threads argument while
in reality it does not effectively allow multthreading.

Let's keep this behavior for machines older than 7.2 and
refuse to use threads in newer machines until multithreading
is really exposed to the guest by the machine.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Message-Id: <20221103170150.20789-3-pmorel@linux.ibm.com>
[thuth: Small fixes to the commit description]
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Pierre Morel 2022-11-03 18:01:41 +01:00 • committed by Thomas Huth
parent 1fd396e322
commit 6393b29966
2 changed files with 12 additions and 0 deletions
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include/hw/s390x/s390-virtio-ccw.h
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@ -40,6 +40,7 @@ struct S390CcwMachineClass {
bool cpu_model_allowed;
bool css_migration_enabled;
bool hpage_1m_allowed;
int max_threads;
};
/* runtime-instrumentation allowed by the machine */