mirror of https://github.com/xemu-project/xemu.git
i386: Define static "base" CPU model
The query-cpu-model-expand QMP command needs at least one static model, to allow the "static" expansion mode to be implemented. Instead of defining static versions of every CPU model, define a "base" CPU model that has absolutely no feature flag enabled. Despite having no CPUID data set at all, "-cpu base" is even a functional CPU: * It can boot a Slackware Linux 1.01 image with a Linux 0.99.12 kernel[1]. * It is even possible to boot[2] a modern Fedora x86_64 guest by manually enabling the following CPU features: -cpu base,+lm,+msr,+pae,+fpu,+cx8,+cmov,+sse,+sse2,+fxsr [1] http://www.qemu-advent-calendar.org/2014/#day-1 [2] This is what can be seen in the guest: [root@localhost ~]# cat /proc/cpuinfo processor : 0 vendor_id : unknown cpu family : 0 model : 0 model name : 00/00 stepping : 0 physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu msr pae cx8 cmov fxsr sse sse2 lm nopl bugs : bogomips : 5832.70 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: [root@localhost ~]# x86info -v -a x86info v1.30. Dave Jones 2001-2011 Feedback to <davej@redhat.com>. No TSC, MHz calculation cannot be performed. Unknown vendor (0) MP Table: Family: 0 Model: 0 Stepping: 0 CPU Model (x86info's best guess): eax in: 0x00000000, eax = 00000001 ebx = 00000000 ecx = 00000000 edx = 00000000 eax in: 0x00000001, eax = 00000000 ebx = 00000800 ecx = 00000000 edx = 07008161 eax in: 0x80000000, eax = 80000001 ebx = 00000000 ecx = 00000000 edx = 00000000 eax in: 0x80000001, eax = 00000000 ebx = 00000000 ecx = 00000000 edx = 20000000 Feature flags: fpu Onboard FPU msr Model-Specific Registers pae Physical Address Extensions cx8 CMPXCHG8 instruction cmov CMOV instruction fxsr FXSAVE and FXRSTOR instructions sse SSE support sse2 SSE2 support Long NOPs supported: yes Address sizes : 0 bits physical, 0 bits virtual 0MHz processor (estimate). running at an estimated 0MHz [root@localhost ~]# Message-Id: <20170222190029.17243-2-ehabkost@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Tested-by: Jiri Denemark <jdenemar@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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@ -50,6 +50,7 @@ typedef struct X86CPUDefinition X86CPUDefinition;
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* @kvm_required: Whether CPU model requires KVM to be enabled.
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* @ordering: Ordering on the "-cpu help" CPU model list.
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* @migration_safe: See CpuDefinitionInfo::migration_safe
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* @static_model: See CpuDefinitionInfo::static
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* @parent_realize: The parent class' realize handler.
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* @parent_reset: The parent class' reset handler.
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*
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@ -68,6 +69,7 @@ typedef struct X86CPUClass {
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bool kvm_required;
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int ordering;
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bool migration_safe;
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bool static_model;
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/* Optional description of CPU model.
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* If unavailable, cpu_def->model_id is used */
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@ -2229,6 +2229,7 @@ static void x86_cpu_definition_entry(gpointer data, gpointer user_data)
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info->q_typename = g_strdup(object_class_get_name(oc));
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info->migration_safe = cc->migration_safe;
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info->has_migration_safe = true;
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info->q_static = cc->static_model;
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entry = g_malloc0(sizeof(*entry));
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entry->value = info;
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@ -3835,6 +3836,24 @@ static const TypeInfo x86_cpu_type_info = {
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.class_init = x86_cpu_common_class_init,
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};
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/* "base" CPU model, used by query-cpu-model-expansion */
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static void x86_cpu_base_class_init(ObjectClass *oc, void *data)
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{
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X86CPUClass *xcc = X86_CPU_CLASS(oc);
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xcc->static_model = true;
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xcc->migration_safe = true;
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xcc->model_description = "base CPU model type with no features enabled";
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xcc->ordering = 8;
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}
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static const TypeInfo x86_base_cpu_type_info = {
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.name = X86_CPU_TYPE_NAME("base"),
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.parent = TYPE_X86_CPU,
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.class_init = x86_cpu_base_class_init,
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};
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static void x86_cpu_register_types(void)
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{
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int i;
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@ -3844,6 +3863,7 @@ static void x86_cpu_register_types(void)
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x86_register_cpudef_type(&builtin_x86_defs[i]);
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}
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type_register_static(&max_x86_cpu_type_info);
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type_register_static(&x86_base_cpu_type_info);
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#ifdef CONFIG_KVM
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type_register_static(&host_x86_cpu_type_info);
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#endif
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