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| author | Pierre Morel <pmorel@linux.ibm.com> | 2022-11-03 18:01:41 +0100 |
|---|---|---|
| committer | Thomas Huth <thuth@redhat.com> | 2022-11-06 12:38:57 +0100 |
| commit | 6393b29966fce3c0e47746a9646ae439e7fd0728 (patch) | |
| tree | 1aa7d776bfe1568091f34de3eab37ede658b7f13 | |
| parent | 1fd396e32288bbf536483c74b68cb3ee86005a9f (diff) | |
| download | qemu-6393b29966fce3c0e47746a9646ae439e7fd0728.zip qemu-6393b29966fce3c0e47746a9646ae439e7fd0728.tar.gz qemu-6393b29966fce3c0e47746a9646ae439e7fd0728.tar.bz2 | |
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>
| -rw-r--r-- | hw/s390x/s390-virtio-ccw.c | 11 | ||||
| -rw-r--r-- | include/hw/s390x/s390-virtio-ccw.h | 1 |
2 files changed, 12 insertions, 0 deletions
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index 196773c..560ddbb 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); diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-virtio-ccw.h index 8a0090a..4f8a39a 100644 --- a/include/hw/s390x/s390-virtio-ccw.h +++ b/include/hw/s390x/s390-virtio-ccw.h @@ -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 */ |