s390x/cpu topology: add max_threads machine class attribute

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>

1 files changed, 11 insertions, 0 deletions

diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 196773c833..560ddbb6fb 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -85,8 +85,15 @@ out:
 static void s390_init_cpus(MachineState *machine)
 {
     MachineClass *mc = MACHINE_GET_CLASS(machine);
+    S390CcwMachineClass *s390mc = S390_CCW_MACHINE_CLASS(mc);
     int i;
 
+    if (machine->smp.threads > s390mc->max_threads) {
+        error_report("S390 does not support more than %d threads.",
+                     s390mc->max_threads);
+        exit(1);
+    }
+
     /* initialize possible_cpus */
     mc->possible_cpu_arch_ids(machine);
 
@@ -731,6 +738,7 @@ static void ccw_machine_class_init(ObjectClass *oc, void *data)
     s390mc->cpu_model_allowed = true;
     s390mc->css_migration_enabled = true;
     s390mc->hpage_1m_allowed = true;
+    s390mc->max_threads = 1;
     mc->init = ccw_init;
     mc->reset = s390_machine_reset;
     mc->block_default_type = IF_VIRTIO;
@@ -859,8 +867,11 @@ static void ccw_machine_7_1_instance_options(MachineState *machine)
 
 static void ccw_machine_7_1_class_options(MachineClass *mc)
 {
+    S390CcwMachineClass *s390mc = S390_CCW_MACHINE_CLASS(mc);
+
     ccw_machine_7_2_class_options(mc);
     compat_props_add(mc->compat_props, hw_compat_7_1, hw_compat_7_1_len);
+    s390mc->max_threads = S390_MAX_CPUS;
 }
 DEFINE_CCW_MACHINE(7_1, "7.1", false);