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Re: [PATCH-for-9.1 07/21] target/mips: Make MIPS_CPU common to new MIPS3


From: Philippe Mathieu-Daudé
Subject: Re: [PATCH-for-9.1 07/21] target/mips: Make MIPS_CPU common to new MIPS32_CPU / MIPS64_CPU types
Date: Tue, 19 Mar 2024 19:12:46 +0100
User-agent: Mozilla Thunderbird

On 15/3/24 14:08, Philippe Mathieu-Daudé wrote:
"target/foo/cpu-qom.h" can not use any target specific definitions.

Currently "target/mips/cpu-qom.h" defines TYPE_MIPS_CPU depending
on the mips(32)/mips64 build type. This doesn't scale in a
heterogeneous context where we need to access both types concurrently.

In order to do that, introduce the new MIPS32_CPU / MIPS64_CPU types,
both inheriting a common TYPE_MIPS_CPU base type.

Keep the current CPU types registered in mips_register_cpudef_type()
as 32 or 64-bit, but instead of depending on the binary built being
targeting 32/64-bit, check whether the CPU is 64-bit by looking at
the CPU_MIPS64 bit.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
  target/mips/cpu-qom.h              | 13 +++++++------
  target/mips/cpu.c                  | 11 ++++++++++-
  target/mips/sysemu/mips-qmp-cmds.c | 26 ++------------------------
  3 files changed, 19 insertions(+), 31 deletions(-)

diff --git a/target/mips/cpu-qom.h b/target/mips/cpu-qom.h
index 0eea2a2598..bf464f16b6 100644
--- a/target/mips/cpu-qom.h
+++ b/target/mips/cpu-qom.h
@@ -1,5 +1,5 @@
  /*
- * QEMU MIPS CPU
+ * QEMU MIPS CPU QOM header (target agnostic)
   *
   * Copyright (c) 2012 SUSE LINUX Products GmbH
   *
@@ -22,14 +22,15 @@
#include "hw/core/cpu.h" -#ifdef TARGET_MIPS64
-#define TYPE_MIPS_CPU "mips64-cpu"
-#else
-#define TYPE_MIPS_CPU "mips-cpu"
-#endif
+#define TYPE_MIPS_CPU   "mips-cpu"
+#define TYPE_MIPS32_CPU "mips32-cpu"
+#define TYPE_MIPS64_CPU "mips64-cpu"
OBJECT_DECLARE_CPU_TYPE(MIPSCPU, MIPSCPUClass, MIPS_CPU) +OBJECT_DECLARE_CPU_TYPE(MIPS32CPU, MIPSCPUClass, MIPS32_CPU)
+OBJECT_DECLARE_CPU_TYPE(MIPS64CPU, MIPSCPUClass, MIPS64_CPU)
+
  #define MIPS_CPU_TYPE_SUFFIX "-" TYPE_MIPS_CPU
  #define MIPS_CPU_TYPE_NAME(model) model MIPS_CPU_TYPE_SUFFIX
diff --git a/target/mips/cpu.c b/target/mips/cpu.c
index c096d97fe3..f3ea6175f2 100644
--- a/target/mips/cpu.c
+++ b/target/mips/cpu.c
@@ -604,6 +604,14 @@ static const TypeInfo mips_cpu_types[] = {
          .abstract       = true,
          .class_size     = sizeof(MIPSCPUClass),
          .class_init     = mips_cpu_class_init,
+    }, {
+        .name           = TYPE_MIPS32_CPU,
+        .parent         = TYPE_MIPS_CPU,
+        .abstract       = true,
+    }, {
+        .name           = TYPE_MIPS64_CPU,
+        .parent         = TYPE_MIPS_CPU,
+        .abstract       = true,
      }
  };
@@ -620,7 +628,8 @@ static void mips_register_cpudef_type(const struct mips_def_t *def)
      char *typename = mips_cpu_type_name(def->name);
      TypeInfo ti = {
          .name = typename,
-        .parent = TYPE_MIPS_CPU,
+        .parent = def->insn_flags & CPU_MIPS64
+                  ? TYPE_MIPS64_CPU : TYPE_MIPS32_CPU,
          .class_init = mips_cpu_cpudef_class_init,
          .class_data = (void *)def,
      };

Oops, I got 2 commits squashed by mistake here...

diff --git a/target/mips/sysemu/mips-qmp-cmds.c 
b/target/mips/sysemu/mips-qmp-cmds.c
index 7340ac70ba..329db3a028 100644
--- a/target/mips/sysemu/mips-qmp-cmds.c
+++ b/target/mips/sysemu/mips-qmp-cmds.c
@@ -8,31 +8,9 @@
#include "qemu/osdep.h"
  #include "qapi/qapi-commands-machine-target.h"
-#include "cpu.h"
-
-static void mips_cpu_add_definition(gpointer data, gpointer user_data)
-{
-    ObjectClass *oc = data;
-    CpuDefinitionInfoList **cpu_list = user_data;
-    CpuDefinitionInfo *info;
-    const char *typename;
-
-    typename = object_class_get_name(oc);
-    info = g_malloc0(sizeof(*info));
-    info->name = cpu_model_from_type(typename);
-    info->q_typename = g_strdup(typename);
-
-    QAPI_LIST_PREPEND(*cpu_list, info);
-}
+#include "qapi/commands-target-compat.h"
CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
  {
-    CpuDefinitionInfoList *cpu_list = NULL;
-    GSList *list;
-
-    list = object_class_get_list(TYPE_MIPS_CPU, false);
-    g_slist_foreach(list, mips_cpu_add_definition, &cpu_list);
-    g_slist_free(list);
-
-    return cpu_list;
+    return generic_query_cpu_definitions(errp);
  }




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