[PATCH 5/7] i386: Remove x86_cpu_set_default_version() function

[Eduardo Habkost <ehabkost@redhat.com>]

We will introduce code that will return machine-type-specific
from other machines (not the current one), so we'll need a helper
for getting the default CPU version from a machine class.

With the new helper, we don't need the machine init function to
call x86_cpu_set_default_version() anymore: we can just look at
the machine class of the current machine.  Replace the
default_cpu_version static variable with a default_cpu_version()
function that will look at qdev_get_machine().

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 include/hw/i386/pc.h |  5 ++++-
 target/i386/cpu.h    |  6 ------
 hw/i386/pc.c         |  3 ---
 target/i386/cpu.c    | 28 ++++++++++++++++++++--------
 4 files changed, 24 insertions(+), 18 deletions(-)

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 37bfd95113..00ac726ebc 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -113,7 +113,10 @@ typedef struct PCMachineClass {
 
     /* Compat options: */
 
-    /* Default CPU model version.  See x86_cpu_set_default_version(). */
+    /*
+     * Default CPU model version for CPU models having
+     * version == CPU_VERSION_AUTO.
+     */
     int default_cpu_version;
 
     /* ACPI compat: */
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index cedb5bc205..aa17c79b43 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -2168,12 +2168,6 @@ void x86_cpu_change_kvm_default(const char *prop, const char *value);
 
 typedef int X86CPUVersion;
 
-/*
- * Set default CPU model version for CPU models having
- * version == CPU_VERSION_AUTO.
- */
-void x86_cpu_set_default_version(X86CPUVersion version);
-
 /* Return name of 32-bit register, from a R_* constant */
 const char *get_register_name_32(unsigned int reg);
 
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 4b1904237e..64ec995172 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1503,9 +1503,6 @@ void pc_cpus_init(PCMachineState *pcms)
     const CPUArchIdList *possible_cpus;
     MachineState *ms = MACHINE(pcms);
     MachineClass *mc = MACHINE_GET_CLASS(pcms);
-    PCMachineClass *pcmc = PC_MACHINE_CLASS(mc);
-
-    x86_cpu_set_default_version(pcmc->default_cpu_version);
 
     /* Calculates the limit to CPU APIC ID values
      *
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 8cecc669b3..5dbd379331 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -57,6 +57,7 @@
 #include "hw/xen/xen.h"
 #include "hw/i386/apic_internal.h"
 #include "hw/boards.h"
+#include "hw/i386/pc.h"
 #endif
 
 #include "disas/capstone.h"
@@ -3165,14 +3166,25 @@ static PropValue tcg_default_props[] = {
 };
 
 
-X86CPUVersion default_cpu_version = CPU_VERSION_LATEST;
+#ifdef CONFIG_USER_ONLY
+static X86CPUVersion default_cpu_version(void)
+{
+    return CPU_VERSION_LATEST;
+}
+#else
+static X86CPUVersion default_cpu_version_for_machine(MachineClass *mc)
+{
+    PCMachineClass *pcmc =
+        (PCMachineClass *)object_class_dynamic_cast(OBJECT_CLASS(mc), TYPE_PC_MACHINE);
+    return pcmc ? pcmc->default_cpu_version : CPU_VERSION_LATEST;
+}
 
-void x86_cpu_set_default_version(X86CPUVersion version)
+static X86CPUVersion default_cpu_version(void)
 {
-    /* Translating CPU_VERSION_AUTO to CPU_VERSION_AUTO doesn't make sense */
-    assert(version != CPU_VERSION_AUTO);
-    default_cpu_version = version;
+    return default_cpu_version_for_machine(MACHINE_GET_CLASS(qdev_get_machine()));
 }
+#endif
+
 
 static X86CPUVersion x86_cpu_model_last_version(const X86CPUModel *model)
 {
@@ -4047,8 +4059,8 @@ static void x86_cpu_definition_entry(gpointer data, gpointer user_data)
      * Old machine types won't report aliases, so that alias translation
      * doesn't break compatibility with previous QEMU versions.
      */
-    if (default_cpu_version != CPU_VERSION_LEGACY) {
-        info->alias_of = x86_cpu_class_get_alias_of(cc, default_cpu_version);
+    if (default_cpu_version() != CPU_VERSION_LEGACY) {
+        info->alias_of = x86_cpu_class_get_alias_of(cc, default_cpu_version());
         info->has_alias_of = !!info->alias_of;
     }
 
@@ -4119,7 +4131,7 @@ static void x86_cpu_apply_props(X86CPU *cpu, PropValue *props)
 static void x86_cpu_apply_version_props(X86CPU *cpu, X86CPUModel *model)
 {
     const X86CPUVersionDefinition *vdef;
-    X86CPUVersion version = x86_cpu_model_resolve_version(model, default_cpu_version);
+    X86CPUVersion version = x86_cpu_model_resolve_version(model, default_cpu_version());
 
     if (version == CPU_VERSION_LEGACY) {
         return;
-- 
2.21.0