[PATCH v2 04/15] Improve vm_stop reason declarations

[Jan Kiszka <jan.kiszka@siemens.com>]

Define and use dedicated constants for vm_stop reasons, they actually
have nothing to do with the EXCP_* defines used so far. At this chance,
specify more detailed reasons so that VM state change handlers can
evaluate them.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---

Changes in v2:
 - VMSTOP_INTERRUPT -> VMSTOP_USER
 - differentiate between VMSTOP_SAVEVM/LOADVM/MIGRATE

 cpus.c          |    4 ++--
 gdbstub.c       |   19 ++++++++++---------
 hw/ide/core.c   |    2 +-
 hw/scsi-disk.c  |    2 +-
 hw/virtio-blk.c |    2 +-
 hw/watchdog.c   |    2 +-
 kvm-all.c       |    2 +-
 migration.c     |    2 +-
 monitor.c       |    4 ++--
 savevm.c        |    4 ++--
 sysemu.h        |   10 ++++++++++
 vl.c            |    2 +-
 12 files changed, 33 insertions(+), 22 deletions(-)

diff --git a/cpus.c b/cpus.c
index 802d15a..ca1f01d 100644
--- a/cpus.c
+++ b/cpus.c
@@ -168,8 +168,8 @@ static bool all_cpu_threads_idle(void)
 static void cpu_debug_handler(CPUState *env)
 {
     gdb_set_stop_cpu(env);
-    debug_requested = EXCP_DEBUG;
-    vm_stop(EXCP_DEBUG);
+    debug_requested = VMSTOP_DEBUG;
+    vm_stop(VMSTOP_DEBUG);
 }
 
 #ifdef CONFIG_LINUX
diff --git a/gdbstub.c b/gdbstub.c
index d6556c9..ed51a8a 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -2194,14 +2194,14 @@ static void gdb_vm_state_change(void *opaque, int running, int reason)
     const char *type;
     int ret;
 
-    if (running || (reason != EXCP_DEBUG && reason != EXCP_INTERRUPT) ||
-        s->state == RS_INACTIVE || s->state == RS_SYSCALL)
+    if (running || (reason != VMSTOP_DEBUG && reason != VMSTOP_USER) ||
+        s->state == RS_INACTIVE || s->state == RS_SYSCALL) {
         return;
-
+    }
     /* disable single step if it was enable */
     cpu_single_step(env, 0);
 
-    if (reason == EXCP_DEBUG) {
+    if (reason == VMSTOP_DEBUG) {
         if (env->watchpoint_hit) {
             switch (env->watchpoint_hit->flags & BP_MEM_ACCESS) {
             case BP_MEM_READ:
@@ -2252,7 +2252,7 @@ void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...)
     gdb_current_syscall_cb = cb;
     s->state = RS_SYSCALL;
 #ifndef CONFIG_USER_ONLY
-    vm_stop(EXCP_DEBUG);
+    vm_stop(VMSTOP_DEBUG);
 #endif
     s->state = RS_IDLE;
     va_start(va, fmt);
@@ -2326,7 +2326,7 @@ static void gdb_read_byte(GDBState *s, int ch)
     if (vm_running) {
         /* when the CPU is running, we cannot do anything except stop
            it when receiving a char */
-        vm_stop(EXCP_INTERRUPT);
+        vm_stop(VMSTOP_USER);
     } else
 #endif
     {
@@ -2588,7 +2588,7 @@ static void gdb_chr_event(void *opaque, int event)
 {
     switch (event) {
     case CHR_EVENT_OPENED:
-        vm_stop(EXCP_INTERRUPT);
+        vm_stop(VMSTOP_USER);
         gdb_has_xml = 0;
         break;
     default:
@@ -2628,8 +2628,9 @@ static int gdb_monitor_write(CharDriverState *chr, const uint8_t *buf, int len)
 #ifndef _WIN32
 static void gdb_sigterm_handler(int signal)
 {
-    if (vm_running)
-        vm_stop(EXCP_INTERRUPT);
+    if (vm_running) {
+        vm_stop(VMSTOP_USER);
+    }
 }
 #endif
 
diff --git a/hw/ide/core.c b/hw/ide/core.c
index dd63664..9c91a49 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -465,7 +465,7 @@ static int ide_handle_rw_error(IDEState *s, int error, int op)
         s->bus->dma->ops->set_unit(s->bus->dma, s->unit);
         s->bus->dma->ops->add_status(s->bus->dma, op);
         bdrv_mon_event(s->bs, BDRV_ACTION_STOP, is_read);
-        vm_stop(0);
+        vm_stop(VMSTOP_DISKFULL);
     } else {
         if (op & BM_STATUS_DMA_RETRY) {
             dma_buf_commit(s, 0);
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 488eedd..b05e654 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -239,7 +239,7 @@ static int scsi_handle_rw_error(SCSIDiskReq *r, int error, int type)
         r->status |= SCSI_REQ_STATUS_RETRY | type;
 
         bdrv_mon_event(s->bs, BDRV_ACTION_STOP, is_read);
-        vm_stop(0);
+        vm_stop(VMSTOP_DISKFULL);
     } else {
         if (type == SCSI_REQ_STATUS_RETRY_READ) {
             r->req.bus->complete(r->req.bus, SCSI_REASON_DATA, r->req.tag, 0);
diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index ffac5a4..b14fb99 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -78,7 +78,7 @@ static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error,
         req->next = s->rq;
         s->rq = req;
         bdrv_mon_event(s->bs, BDRV_ACTION_STOP, is_read);
-        vm_stop(0);
+        vm_stop(VMSTOP_DISKFULL);
     } else {
         virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
         bdrv_mon_event(s->bs, BDRV_ACTION_REPORT, is_read);
diff --git a/hw/watchdog.c b/hw/watchdog.c
index e9dd56e..1c900a1 100644
--- a/hw/watchdog.c
+++ b/hw/watchdog.c
@@ -132,7 +132,7 @@ void watchdog_perform_action(void)
 
     case WDT_PAUSE:             /* same as 'stop' command in monitor */
         watchdog_mon_event("pause");
-        vm_stop(0);
+        vm_stop(VMSTOP_WATCHDOG);
         break;
 
     case WDT_DEBUG:
diff --git a/kvm-all.c b/kvm-all.c
index 42dfed8..19cf188 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -994,7 +994,7 @@ int kvm_cpu_exec(CPUState *env)
 
     if (ret < 0) {
         cpu_dump_state(env, stderr, fprintf, CPU_DUMP_CODE);
-        vm_stop(0);
+        vm_stop(VMSTOP_PANIC);
         env->exit_request = 1;
     }
     if (env->exit_request) {
diff --git a/migration.c b/migration.c
index 3612572..af3a1f2 100644
--- a/migration.c
+++ b/migration.c
@@ -378,7 +378,7 @@ void migrate_fd_put_ready(void *opaque)
         int old_vm_running = vm_running;
 
         DPRINTF("done iterating\n");
-        vm_stop(0);
+        vm_stop(VMSTOP_MIGRATE);
 
         if ((qemu_savevm_state_complete(s->mon, s->file)) < 0) {
             if (old_vm_running) {
diff --git a/monitor.c b/monitor.c
index 7fc311d..22ae3bb 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1255,7 +1255,7 @@ static void do_singlestep(Monitor *mon, const QDict *qdict)
  */
 static int do_stop(Monitor *mon, const QDict *qdict, QObject **ret_data)
 {
-    vm_stop(EXCP_INTERRUPT);
+    vm_stop(VMSTOP_USER);
     return 0;
 }
 
@@ -2783,7 +2783,7 @@ static void do_loadvm(Monitor *mon, const QDict *qdict)
     int saved_vm_running  = vm_running;
     const char *name = qdict_get_str(qdict, "name");
 
-    vm_stop(0);
+    vm_stop(VMSTOP_LOADVM);
 
     if (load_vmstate(name) == 0 && saved_vm_running) {
         vm_start();
diff --git a/savevm.c b/savevm.c
index 6d83b0f..a50fd31 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1575,7 +1575,7 @@ static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
     int ret;
 
     saved_vm_running = vm_running;
-    vm_stop(0);
+    vm_stop(VMSTOP_SAVEVM);
 
     if (qemu_savevm_state_blocked(mon)) {
         ret = -EINVAL;
@@ -1904,7 +1904,7 @@ void do_savevm(Monitor *mon, const QDict *qdict)
     }
 
     saved_vm_running = vm_running;
-    vm_stop(0);
+    vm_stop(VMSTOP_SAVEVM);
 
     memset(sn, 0, sizeof(*sn));
 
diff --git a/sysemu.h b/sysemu.h
index 23ae17e..0628d3d 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -37,6 +37,16 @@ VMChangeStateEntry *qemu_add_vm_change_state_handler(VMChangeStateHandler *cb,
                                                      void *opaque);
 void qemu_del_vm_change_state_handler(VMChangeStateEntry *e);
 
+#define VMSTOP_USER      0
+#define VMSTOP_DEBUG     1
+#define VMSTOP_SHUTDOWN  2
+#define VMSTOP_DISKFULL  3
+#define VMSTOP_WATCHDOG  4
+#define VMSTOP_PANIC     5
+#define VMSTOP_SAVEVM    6
+#define VMSTOP_LOADVM    7
+#define VMSTOP_MIGRATE   8
+
 void vm_start(void);
 void vm_stop(int reason);
 
diff --git a/vl.c b/vl.c
index c9fa266..6d2d1d3 100644
--- a/vl.c
+++ b/vl.c
@@ -1433,7 +1433,7 @@ static void main_loop(void)
         if (qemu_shutdown_requested()) {
             monitor_protocol_event(QEVENT_SHUTDOWN, NULL);
             if (no_shutdown) {
-                vm_stop(0);
+                vm_stop(VMSTOP_SHUTDOWN);
                 no_shutdown = 0;
             } else
                 break;
-- 
1.7.1