accel/tcg: Restrict tcg_exec_[un]realizefn() to TCG

We don't need to expose these TCG-specific methods to the
whole code base. Register them as AccelClass handlers, they
will be called by the generic accel_cpu_[un]realize() methods.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Claudio Fontana <cfontana@suse.de>
Message-Id: <20231003123026.99229-8-philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

accel/tcg/internal.h

@@ -80,6 +80,9 @@ bool tb_invalidate_phys_page_unwind(tb_page_addr_t addr, uintptr_t pc);
 void cpu_restore_state_from_tb(CPUState *cpu, TranslationBlock *tb,
                                uintptr_t host_pc);
 
+bool tcg_exec_realizefn(CPUState *cpu, Error **errp);
+void tcg_exec_unrealizefn(CPUState *cpu);
+
 /* Return the current PC from CPU, which may be cached in TB. */
 static inline vaddr log_pc(CPUState *cpu, const TranslationBlock *tb)
 {

accel/tcg/tcg-all.c

@@ -227,6 +227,8 @@ static void tcg_accel_class_init(ObjectClass *oc, void *data)
     AccelClass *ac = ACCEL_CLASS(oc);
     ac->name = "tcg";
     ac->init_machine = tcg_init_machine;
+    ac->cpu_common_realize = tcg_exec_realizefn;
+    ac->cpu_common_unrealize = tcg_exec_unrealizefn;
     ac->allowed = &tcg_allowed;
     ac->gdbstub_supported_sstep_flags = tcg_gdbstub_supported_sstep_flags;
 

cpu.c

@@ -140,11 +140,6 @@ void cpu_exec_realizefn(CPUState *cpu, Error **errp)
         return;
     }
 
-    /* NB: errp parameter is unused currently */
-    if (tcg_enabled()) {
-        tcg_exec_realizefn(cpu, errp);
-    }
-
     /* Wait until cpu initialization complete before exposing cpu. */
     cpu_list_add(cpu);
 
@@ -187,13 +182,9 @@ void cpu_exec_unrealizefn(CPUState *cpu)
     cpu_list_remove(cpu);
     /*
      * Now that the vCPU has been removed from the RCU list, we can call
-     * tcg_exec_unrealizefn and
      * accel_cpu_common_unrealize, which may free fields using call_rcu.
      */
     accel_cpu_common_unrealize(cpu);
-    if (tcg_enabled()) {
-        tcg_exec_unrealizefn(cpu);
-    }
 }
 
 /*

include/exec/cpu-all.h

@@ -422,8 +422,6 @@ void dump_exec_info(GString *buf);
 
 /* accel/tcg/cpu-exec.c */
 int cpu_exec(CPUState *cpu);
-bool tcg_exec_realizefn(CPUState *cpu, Error **errp);
-void tcg_exec_unrealizefn(CPUState *cpu);
 
 /**
  * cpu_set_cpustate_pointers(cpu)