[Qemu-devel] [PATCH v2 6/6] pc: parse cpu features only once

[Igor Mammedov]

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.
Parsing also should be done before any CPU is
created so that features would affect the first
CPU a well.

Signed-off-by: Igor Mammedov <address@hidden>
---
 hw/i386/pc.c      | 37 ++++++++++++++++++++++++++++---------
 qom/cpu.c         |  1 -
 target-i386/cpu.c | 44 --------------------------------------------
 target-i386/cpu.h |  1 -
 4 files changed, 28 insertions(+), 55 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 7198ed5..a3f94b1 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1039,21 +1039,17 @@ 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));
@@ -1065,7 +1061,8 @@ 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;
 
@@ -1093,7 +1090,9 @@ 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;
@@ -1104,6 +1103,10 @@ void pc_hot_add_cpu(const int64_t id, Error **errp)
 void pc_cpus_init(PCMachineState *pcms)
 {
     int i;
+    CPUClass *cc;
+    ObjectClass *oc;
+    const char *typename;
+    gchar **model_pieces;
     X86CPU *cpu = NULL;
     MachineState *machine = MACHINE(pcms);
 
@@ -1116,6 +1119,22 @@ 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
@@ -1136,7 +1155,7 @@ void pc_cpus_init(PCMachineState *pcms)
         pcms->possible_cpus->cpus[i].arch_id = x86_cpu_apic_id_from_index(i);
         pcms->possible_cpus->len++;
         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/qom/cpu.c b/qom/cpu.c
index 1295f5b..b34c4a0 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -297,7 +297,6 @@ static void cpu_common_parse_features(const char *typename, 
char *features,
      * to assert(!cpu_globals_initialized).
      * Current callers of ->parse_features() are:
      * - cpu_generic_init()
-     * - cpu_x86_create()
      */
     if (cpu_globals_initialized) {
         return;
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 279f656..4d36623 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -2214,50 +2214,6 @@ 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 d9ab884..f4f65ce 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -1234,7 +1234,6 @@ 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);
-- 
2.7.0