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0b47ec4b95
Calling qdev_get_machine() from a QOM instance_init function is fragile because we can't be sure the machine object actually exists. And this happens to break when passing ",help" on the command line to get the list of properties for a CPU core device types : $ ./qemu-system-ppc64 -device power8_v2.0-spapr-cpu-core,help qemu-system-ppc64: ../../hw/core/machine.c:1290: qdev_get_machine: Assertion `machine != NULL' failed. Aborted (core dumped) This used to work before QEMU 5.0, but commit3df261b667unwillingly introduced a subtle regression : the above command line needs to create an instance but the instance_init function of the base class calls qdev_get_machine() before qemu_create_machine() has been called, which is a programming bug. Use current_machine instead. It is okay to skip the setting of nr_thread in this case since only its type is displayed. Fixes:3df261b667("softmmu/vl.c: Handle '-cpu help' and '-device help' before 'no default machine'") Reported-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Greg Kurz <groug@kaod.org> Cc: peter.maydell@linaro.org Message-Id: <20210409160339.500167-3-groug@kaod.org> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
/*
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* CPU core abstract device
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*
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* Copyright (C) 2016 Bharata B Rao <bharata@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "hw/cpu/core.h"
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#include "qapi/visitor.h"
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#include "qemu/module.h"
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#include "qapi/error.h"
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#include "sysemu/cpus.h"
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#include "hw/boards.h"
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static void core_prop_get_core_id(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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CPUCore *core = CPU_CORE(obj);
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int64_t value = core->core_id;
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visit_type_int(v, name, &value, errp);
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}
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static void core_prop_set_core_id(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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CPUCore *core = CPU_CORE(obj);
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int64_t value;
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if (!visit_type_int(v, name, &value, errp)) {
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return;
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}
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if (value < 0) {
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error_setg(errp, "Invalid core id %"PRId64, value);
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return;
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}
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core->core_id = value;
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}
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static void core_prop_get_nr_threads(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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CPUCore *core = CPU_CORE(obj);
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int64_t value = core->nr_threads;
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visit_type_int(v, name, &value, errp);
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}
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static void core_prop_set_nr_threads(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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CPUCore *core = CPU_CORE(obj);
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int64_t value;
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if (!visit_type_int(v, name, &value, errp)) {
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return;
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}
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core->nr_threads = value;
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}
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static void cpu_core_instance_init(Object *obj)
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{
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CPUCore *core = CPU_CORE(obj);
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/*
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* Only '-device something-cpu-core,help' can get us there before
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* the machine has been created. We don't care to set nr_threads
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* in this case since it isn't used afterwards.
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*/
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if (current_machine) {
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core->nr_threads = current_machine->smp.threads;
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}
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}
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static void cpu_core_class_init(ObjectClass *oc, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(oc);
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set_bit(DEVICE_CATEGORY_CPU, dc->categories);
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object_class_property_add(oc, "core-id", "int", core_prop_get_core_id,
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core_prop_set_core_id, NULL, NULL);
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object_class_property_add(oc, "nr-threads", "int", core_prop_get_nr_threads,
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core_prop_set_nr_threads, NULL, NULL);
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}
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static const TypeInfo cpu_core_type_info = {
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.name = TYPE_CPU_CORE,
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.parent = TYPE_DEVICE,
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.abstract = true,
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.class_init = cpu_core_class_init,
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.instance_size = sizeof(CPUCore),
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.instance_init = cpu_core_instance_init,
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};
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static void cpu_core_register_types(void)
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{
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type_register_static(&cpu_core_type_info);
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}
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type_init(cpu_core_register_types)
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