qemu-nbd: print error messages from the daemon through a pipe

[qemu.git] / savevm.c

diff --git a/savevm.c b/savevm.c
index 5b340b695f34b0089bc6dded18b36c86236968e3..bee16c0b7b5ad88d3784b019d4eb7e62df95d933 100644 (file)
--- a/savevm.c
+++ b/savevm.c
@@ -81,6 +81,7 @@
 #include "migration.h"
 #include "qemu_socket.h"
 #include "qemu-queue.h"
+#include "qemu-timer.h"
 #include "cpus.h"
 
 #define SELF_ANNOUNCE_ROUNDS 5
@@ -475,6 +476,8 @@ static void qemu_fill_buffer(QEMUFile *f)
     if (len > 0) {
         f->buf_size += len;
         f->buf_offset += len;
+    } else if (len == 0) {
+        f->last_error = -EIO;
     } else if (len != -EAGAIN)
         f->last_error = len;
 }
@@ -712,6 +715,30 @@ uint64_t qemu_get_be64(QEMUFile *f)
     return v;
 }
 
+
+/* timer */
+
+void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
+{
+    uint64_t expire_time;
+
+    expire_time = qemu_timer_expire_time_ns(ts);
+    qemu_put_be64(f, expire_time);
+}
+
+void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
+{
+    uint64_t expire_time;
+
+    expire_time = qemu_get_be64(f);
+    if (expire_time != -1) {
+        qemu_mod_timer_ns(ts, expire_time);
+    } else {
+        qemu_del_timer(ts);
+    }
+}
+
+
 /* bool */
 
 static int get_bool(QEMUFile *f, void *pv, size_t size)
@@ -1534,7 +1561,11 @@ int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
         qemu_put_be32(f, se->instance_id);
         qemu_put_be32(f, se->version_id);
 
-        se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
+        ret = se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
+        if (ret < 0) {
+            qemu_savevm_state_cancel(mon, f);
+            return ret;
+        }
     }
     ret = qemu_file_get_error(f);
     if (ret != 0) {
@@ -1565,7 +1596,7 @@ int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
         qemu_put_be32(f, se->section_id);
 
         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
-        if (!ret) {
+        if (ret <= 0) {
             /* Do not proceed to the next vmstate before this one reported
                completion of the current stage. This serializes the migration
                and reduces the probability that a faster changing state is
@@ -1586,6 +1617,7 @@ int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
 {
     SaveStateEntry *se;
+    int ret;
 
     cpu_synchronize_all_states();
 
@@ -1597,7 +1629,10 @@ int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
         qemu_put_byte(f, QEMU_VM_SECTION_END);
         qemu_put_be32(f, se->section_id);
 
-        se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
+        ret = se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
+        if (ret < 0) {
+            return ret;
+        }
     }
 
     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
@@ -1639,12 +1674,8 @@ void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
 
 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
 {
-    int saved_vm_running;
     int ret;
 
-    saved_vm_running = runstate_is_running();
-    vm_stop(RUN_STATE_SAVE_VM);
-
     if (qemu_savevm_state_blocked(mon)) {
         ret = -EINVAL;
         goto out;
@@ -1667,9 +1698,6 @@ out:
         ret = qemu_file_get_error(f);
     }
 
-    if (!ret && saved_vm_running)
-        vm_start();
-
     return ret;
 }