[Qemu-devel] [PATCH RFC 8/8] pc: parse cpu features only once

[Igor Mammedov <imammedo@redhat.com>]

considering that features are converted to
global properties and global properties are
automatically applied to every new instance
of created CPU (at object_new() time), there
is no point in parsing cpu_model string every
time a CPU created.
So move parsing outside CPU creation loop and
do it only once.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/i386/pc.c      | 37 ++++++++++++++++++++++++++++---------
 target-i386/cpu.c | 44 --------------------------------------------
 target-i386/cpu.h |  1 -
 3 files changed, 28 insertions(+), 54 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index c48322b..0331e6d 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1041,21 +1041,17 @@ void pc_acpi_smi_interrupt(void *opaque, int irq, int level)
     }
 }
 
-static X86CPU *pc_new_cpu(const char *cpu_model, int64_t apic_id,
+static X86CPU *pc_new_cpu(const char *typename, int64_t apic_id,
                           Error **errp)
 {
     X86CPU *cpu = NULL;
     Error *local_err = NULL;
 
-    cpu = cpu_x86_create(cpu_model, &local_err);
-    if (local_err != NULL) {
-        goto out;
-    }
+    cpu = X86_CPU(object_new(typename));
 
     object_property_set_int(OBJECT(cpu), apic_id, "apic-id", &local_err);
     object_property_set_bool(OBJECT(cpu), true, "realized", &local_err);
 
-out:
     if (local_err) {
         error_propagate(errp, local_err);
         object_unref(OBJECT(cpu));
@@ -1067,7 +1063,8 @@ out:
 void pc_hot_add_cpu(const int64_t id, Error **errp)
 {
     X86CPU *cpu;
-    MachineState *machine = MACHINE(qdev_get_machine());
+    ObjectClass *oc;
+    PCMachineState *pcms = PC_MACHINE(qdev_get_machine());
     int64_t apic_id = x86_cpu_apic_id_from_index(id);
     Error *local_err = NULL;
 
@@ -1095,7 +1092,9 @@ void pc_hot_add_cpu(const int64_t id, Error **errp)
         return;
     }
 
-    cpu = pc_new_cpu(machine->cpu_model, apic_id, &local_err);
+    assert(pcms->possible_cpus->cpus[0].cpu); /* BSP is always present */
+    oc = OBJECT_CLASS(CPU_GET_CLASS(pcms->possible_cpus->cpus[0].cpu));
+    cpu = pc_new_cpu(object_class_get_name(oc), apic_id, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
@@ -1106,6 +1105,10 @@ void pc_hot_add_cpu(const int64_t id, Error **errp)
 void pc_cpus_init(PCMachineState *pcms)
 {
     int i, j;
+    CPUClass *cc;
+    ObjectClass *oc;
+    const char *typename;
+    gchar **model_pieces;
     X86CPU *cpu = NULL;
     MachineState *machine = MACHINE(pcms);
 
@@ -1118,6 +1121,22 @@ void pc_cpus_init(PCMachineState *pcms)
 #endif
     }
 
+    model_pieces = g_strsplit(machine->cpu_model, ",", 2);
+    if (!model_pieces[0]) {
+        error_report("Invalid/empty CPU model name");
+        exit(1);
+    }
+
+    oc = cpu_class_by_name(TYPE_X86_CPU, model_pieces[0]);
+    if (oc == NULL) {
+        error_report("Unable to find CPU definition: %s", model_pieces[0]);
+        exit(1);
+    }
+    typename = object_class_get_name(oc);
+    cc = CPU_CLASS(oc);
+    cc->parse_features(typename, model_pieces[1], &error_fatal);
+    g_strfreev(model_pieces);
+
     /* Calculates the limit to CPU APIC ID values
      *
      * Limit for the APIC ID value, so that all
@@ -1148,7 +1167,7 @@ void pc_cpus_init(PCMachineState *pcms)
         }
 
         if (i < smp_cpus) {
-            cpu = pc_new_cpu(machine->cpu_model, x86_cpu_apic_id_from_index(i),
+            cpu = pc_new_cpu(typename, x86_cpu_apic_id_from_index(i),
                              &error_fatal);
             pcms->possible_cpus->cpus[i].cpu = CPU(cpu);
             object_unref(OBJECT(cpu));
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 871175a..c4f2e2c 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -2209,50 +2209,6 @@ static void x86_cpu_load_def(X86CPU *cpu, X86CPUDefinition *def, Error **errp)
 
 }
 
-X86CPU *cpu_x86_create(const char *cpu_model, Error **errp)
-{
-    X86CPU *cpu = NULL;
-    ObjectClass *oc;
-    CPUClass *cc;
-    gchar **model_pieces;
-    char *name, *features;
-    Error *error = NULL;
-    const char *typename;
-
-    model_pieces = g_strsplit(cpu_model, ",", 2);
-    if (!model_pieces[0]) {
-        error_setg(&error, "Invalid/empty CPU model name");
-        goto out;
-    }
-    name = model_pieces[0];
-    features = model_pieces[1];
-
-    oc = x86_cpu_class_by_name(name);
-    if (oc == NULL) {
-        error_setg(&error, "Unable to find CPU definition: %s", name);
-        goto out;
-    }
-    cc = CPU_CLASS(oc);
-    typename = object_class_get_name(oc);
-
-    cc->parse_features(typename, features, &error);
-    cpu = X86_CPU(object_new(typename));
-    if (error) {
-        goto out;
-    }
-
-out:
-    if (error != NULL) {
-        error_propagate(errp, error);
-        if (cpu) {
-            object_unref(OBJECT(cpu));
-            cpu = NULL;
-        }
-    }
-    g_strfreev(model_pieces);
-    return cpu;
-}
-
 X86CPU *cpu_x86_init(const char *cpu_model)
 {
     return X86_CPU(cpu_generic_init(TYPE_X86_CPU, cpu_model));
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index a257c53..a9a3b87 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -1227,7 +1227,6 @@ void x86_cpu_exec_enter(CPUState *cpu);
 void x86_cpu_exec_exit(CPUState *cpu);
 
 X86CPU *cpu_x86_init(const char *cpu_model);
-X86CPU *cpu_x86_create(const char *cpu_model, Error **errp);
 int cpu_x86_exec(CPUState *cpu);
 void x86_cpu_list(FILE *f, fprintf_function cpu_fprintf);
 int cpu_x86_support_mca_broadcast(CPUX86State *env);
-- 
1.8.3.1