[Qemu-devel] [PATCH 1/2] target-i386: Introduce "-cpu custom"

[Eduardo Habkost <ehabkost@redhat.com>]

Now that we can configure everything in a CPU using QOM properties, add
a new CPU model name that won't load anything from the CPU model table.
That means no CPUID field will be initialized with any data that depends
on CPU model name, machine-type, or accelerator.

This will allow management software to control CPUID data completely
using the "-cpu" command-line option, or using global properties.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 target-i386/cpu.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 4e7cdaa..4677784 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -3052,7 +3052,9 @@ static void x86_cpu_initfn(Object *obj)
         }
     }
 
-    x86_cpu_load_def(cpu, xcc->cpu_def, &error_abort);
+    if (xcc->cpu_def) {
+        x86_cpu_load_def(cpu, xcc->cpu_def, &error_abort);
+    }
 
     /* init various static tables used in TCG mode */
     if (tcg_enabled() && !inited) {
@@ -3182,6 +3184,11 @@ static const TypeInfo x86_cpu_type_info = {
     .class_init = x86_cpu_common_class_init,
 };
 
+static const TypeInfo custom_x86_cpu_type_info = {
+    .name = X86_CPU_TYPE_NAME("custom"),
+    .parent = TYPE_X86_CPU,
+};
+
 static void x86_cpu_register_types(void)
 {
     int i;
@@ -3190,6 +3197,7 @@ static void x86_cpu_register_types(void)
     for (i = 0; i < ARRAY_SIZE(builtin_x86_defs); i++) {
         x86_register_cpudef_type(&builtin_x86_defs[i]);
     }
+    type_register_static(&custom_x86_cpu_type_info);
 #ifdef CONFIG_KVM
     type_register_static(&host_x86_cpu_type_info);
 #endif
-- 
2.1.0