[Qemu-devel] [PATCH V4 02/18] sysemu: support qemu_cpu_reset()

[Qemu-devel] [PATCH V4 02/18] sysemu: support qemu_cpu_reset()

[TAKEDA, toshiya]

Signed-off-by: TAKEDA, toshiya <t-takeda@m1.interq.or.jp>
---
 sysemu.h |    3 +++
 vl.c     |   32 ++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/sysemu.h b/sysemu.h
index 9d80bb2..51c7ac8 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -45,13 +45,16 @@ void cpu_enable_ticks(void);
 void cpu_disable_ticks(void);
 
 void qemu_system_reset_request(void);
+void qemu_cpu_reset_request(void);
 void qemu_system_shutdown_request(void);
 void qemu_system_powerdown_request(void);
 int qemu_shutdown_requested(void);
 int qemu_reset_requested(void);
+int qemu_cpu_reset_requested(void);
 int qemu_powerdown_requested(void);
 extern qemu_irq qemu_system_powerdown;
 void qemu_system_reset(void);
+void qemu_cpu_reset(void);
 
 void do_savevm(Monitor *mon, const QDict *qdict);
 int load_vmstate(Monitor *mon, const char *name);
diff --git a/vl.c b/vl.c
index e606903..565dae4 100644
--- a/vl.c
+++ b/vl.c
@@ -3261,6 +3261,7 @@ typedef struct QEMUResetEntry {
 static QTAILQ_HEAD(reset_handlers, QEMUResetEntry) reset_handlers =
     QTAILQ_HEAD_INITIALIZER(reset_handlers);
 static int reset_requested;
+static int cpu_reset_requested;
 static int shutdown_requested;
 static int powerdown_requested;
 static int debug_requested;
@@ -3280,6 +3281,13 @@ int qemu_reset_requested(void)
     return r;
 }
 
+int qemu_cpu_reset_requested(void)
+{
+    int r = cpu_reset_requested;
+    cpu_reset_requested = 0;
+    return r;
+}
+
 int qemu_powerdown_requested(void)
 {
     int r = powerdown_requested;
@@ -3343,6 +3351,16 @@ void qemu_system_reset(void)
     }
 }
 
+void qemu_cpu_reset(void)
+{
+    CPUState *env;
+
+    /* reset all cpus */
+    for(env = first_cpu; env != NULL; env = env->next_cpu) {
+        cpu_reset(env);
+    }
+}
+
 void qemu_system_reset_request(void)
 {
     if (no_reboot) {
@@ -3353,6 +3371,12 @@ void qemu_system_reset_request(void)
     qemu_notify_event();
 }
 
+void qemu_cpu_reset_request(void)
+{
+    cpu_reset_requested = 1;
+    qemu_notify_event();
+}
+
 void qemu_system_shutdown_request(void)
 {
     shutdown_requested = 1;
@@ -4129,6 +4153,8 @@ static int vm_can_run(void)
         return 0;
     if (reset_requested)
         return 0;
+    if (cpu_reset_requested)
+        return 0;
     if (shutdown_requested)
         return 0;
     if (debug_requested)
@@ -4182,6 +4208,12 @@ static void main_loop(void)
             qemu_system_reset();
             resume_all_vcpus();
         }
+        if (qemu_cpu_reset_requested()) {
+            monitor_protocol_event(QEVENT_RESET, NULL);
+            pause_all_vcpus();
+            qemu_cpu_reset();
+            resume_all_vcpus();
+        }
         if (qemu_powerdown_requested()) {
             monitor_protocol_event(QEVENT_POWERDOWN, NULL);
             qemu_irq_raise(qemu_system_powerdown);
-- 
1.6.4

Re: [Qemu-devel] [PATCH V4 02/18] sysemu: support qemu_cpu_reset()

[Anthony Liguori]

Hi,

Why is this needed verses qemu_system_reset()?

Regards,

Anthony Liguori

Re: [Qemu-devel] [PATCH V4 02/18] sysemu: support qemu_cpu_reset()

[TAKEDA, toshiya]

Hi,

Anthony Liguori wrote:
>Hi,
>
>Why is this needed verses qemu_system_reset()?

PC-98 has the ioport to reset only cpu (don't reset other periferals) 
and I need qemu_cpu_reset() to emulate thios port.

This port was used to return to real mode from protect mode by resetting cpu.
It was added for 80286, but was used on PC-98 with 80386 and later.
(For example for checking of over 1mb memory in hardware initialization bios.)

Thanks,
TAKEDA, toshiya

>
>Regards,
>
>Anthony Liguori
>
>
>