[Qemu-devel] [PATCH 5/8] exec: move cpu_index init and exit to their own function

[Greg Kurz]

This patch splits the cpu_index bits from the rest of the cpu_exec
init and exit code, so that they may be called separately. The goal
is to be able to initialize cpu_index during cpu initialization and
keep the rest for cpu realization.

The cpu_exec_init() and cpu_exec_exit() functions are kept since most
callers will stick to the current behaviour.

Signed-off-by: Greg Kurz <gr...@kaod.org>
---
 exec.c                  |   77 +++++++++++++++++++++++++++++++++++------------
 include/exec/exec-all.h |    2 +
 include/qom/cpu.h       |    2 +
 3 files changed, 61 insertions(+), 20 deletions(-)

diff --git a/exec.c b/exec.c
index a528a1e6bbf6..a9b3b4c2ca45 100644
--- a/exec.c
+++ b/exec.c
@@ -635,26 +635,17 @@ static void cpu_release_index(CPUState *cpu)
     return;
 }
 #endif
 
-void cpu_exec_exit(CPUState *cpu)
+void cpu_exec_unrealize(CPUState *cpu)
 {
     CPUClass *cc = CPU_GET_CLASS(cpu);
 
 #if defined(CONFIG_USER_ONLY)
     cpu_list_lock();
 #endif
-    if (cpu->cpu_index == -1) {
-        /* cpu_index was never allocated by this @cpu or was already freed. */
-#if defined(CONFIG_USER_ONLY)
-        cpu_list_unlock();
-#endif
-        return;
-    }
 
     QTAILQ_REMOVE(&cpus, cpu, node);
-    cpu_release_index(cpu);
-    cpu->cpu_index = -1;
 #if defined(CONFIG_USER_ONLY)
     (void) cc;
     cpu_list_unlock();
 #else
@@ -666,13 +657,54 @@ void cpu_exec_exit(CPUState *cpu)
     }
 #endif
 }
 
-void cpu_exec_init(CPUState *cpu, Error **errp)
+void cpu_exec_exit_cpu_index(CPUState *cpu)
+{
+#if defined(CONFIG_USER_ONLY)
+    cpu_list_lock();
+#endif
+    if (cpu->cpu_index == -1) {
+        /* cpu_index was never allocated by this @cpu or was already freed. */
+#if defined(CONFIG_USER_ONLY)
+        cpu_list_unlock();
+#endif
+        return;
+    }
+
+    cpu_release_index(cpu);
+    cpu->cpu_index = -1;
+#if defined(CONFIG_USER_ONLY)
+    cpu_list_unlock();
+#endif
+}
+
+void cpu_exec_exit(CPUState *cpu)
+{
+    cpu_exec_unrealize(cpu);
+    cpu_exec_exit_cpu_index(cpu);
+}
+
+void cpu_exec_init_cpu_index(CPUState *cpu, Error **errp)
 {
-    CPUClass *cc = CPU_GET_CLASS(cpu);
     Error *local_err = NULL;
 
+#if defined(CONFIG_USER_ONLY)
+    cpu_list_lock();
+#endif
+    cpu->cpu_index = cpu_get_free_index(&local_err);
+#if defined(CONFIG_USER_ONLY)
+    cpu_list_unlock();
+#endif
+    if (local_err) {
+        error_propagate(errp, local_err);
+    }
+}
+
+void cpu_exec_realize(CPUState *cpu, Error **errp)
+{
+    CPUClass *cc = CPU_GET_CLASS(cpu);
+
     cpu->as = NULL;
     cpu->num_ases = 0;
 
 #ifndef CONFIG_USER_ONLY
@@ -695,16 +727,8 @@ void cpu_exec_init(CPUState *cpu, Error **errp)
 
 #if defined(CONFIG_USER_ONLY)
     cpu_list_lock();
 #endif
-    cpu->cpu_index = cpu_get_free_index(&local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-#if defined(CONFIG_USER_ONLY)
-        cpu_list_unlock();
-#endif
-        return;
-    }
     QTAILQ_INSERT_TAIL(&cpus, cpu, node);
 #if defined(CONFIG_USER_ONLY)
     (void) cc;
     cpu_list_unlock();
@@ -717,8 +741,21 @@ void cpu_exec_init(CPUState *cpu, Error **errp)
     }
 #endif
 }
 
+void cpu_exec_init(CPUState *cpu, Error **errp)
+{
+    Error *local_err = NULL;
+
+    cpu_exec_init_cpu_index(cpu, &local_err);
+    if (local_err == NULL) {
+        cpu_exec_realize(cpu, &local_err);
+    }
+    if (local_err != NULL) {
+        error_propagate(errp, local_err);
+    }
+}
+
 #if defined(CONFIG_USER_ONLY)
 static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
 {
     tb_invalidate_phys_page_range(pc, pc + 1, 0);
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index c1f59fa59d2c..0f4cdf368945 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -56,8 +56,10 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
                               target_ulong pc, target_ulong cs_base,
                               uint32_t flags,
                               int cflags);
 void cpu_exec_init(CPUState *cpu, Error **errp);
+void cpu_exec_init_cpu_index(CPUState *cpu, Error **errp);
+void cpu_exec_realize(CPUState *cpu, Error **errp);
 void QEMU_NORETURN cpu_loop_exit(CPUState *cpu);
 void QEMU_NORETURN cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc);
 
 #if !defined(CONFIG_USER_ONLY)
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 32f3af3e1c63..63e77607f644 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -854,8 +854,10 @@ AddressSpace *cpu_get_address_space(CPUState *cpu, int 
asidx);
 
 void QEMU_NORETURN cpu_abort(CPUState *cpu, const char *fmt, ...)
     GCC_FMT_ATTR(2, 3);
 void cpu_exec_exit(CPUState *cpu);
+bool cpu_exec_exit_cpu_index(CPUState *cpu);
+void cpu_exec_unrealize(CPUState *cpu);
 
 #ifdef CONFIG_SOFTMMU
 extern const struct VMStateDescription vmstate_cpu_common;
 #else