migration: pre_save return int

Modify the pre_save method on VMStateDescription to return an int
rather than void so that it potentially can fail.

Changed zillions of devices to make them return 0; the only
case I've made it return non-0 is hw/intc/s390_flic_kvm.c that already
had an error_report/return case.

Note: If you add an error exit in your pre_save you must emit
an error_report to say why.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20170925112917.21340-2-dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

5 files changed, 24 insertions, 8 deletions

diff --git a/hw/net/e1000.c b/hw/net/e1000.c
index eebe3a9c13..cae95185a5 100644
--- a/hw/net/e1000.c
+++ b/hw/net/e1000.c
@@ -1343,7 +1343,7 @@ static bool is_version_1(void *opaque, int version_id)
     return version_id == 1;
 }
 
-static void e1000_pre_save(void *opaque)
+static int e1000_pre_save(void *opaque)
 {
     E1000State *s = opaque;
     NetClientState *nc = qemu_get_queue(s->nic);
@@ -1361,6 +1361,8 @@ static void e1000_pre_save(void *opaque)
     if (nc->link_down && have_autoneg(s)) {
         s->phy_reg[PHY_STATUS] |= MII_SR_AUTONEG_COMPLETE;
     }
+
+    return 0;
 }
 
 static int e1000_post_load(void *opaque, int version_id)
diff --git a/hw/net/e1000e.c b/hw/net/e1000e.c
index 6c42b4478c..744f0f3b91 100644
--- a/hw/net/e1000e.c
+++ b/hw/net/e1000e.c
@@ -523,13 +523,15 @@ static void e1000e_qdev_reset(DeviceState *dev)
     e1000e_core_reset(&s->core);
 }
 
-static void e1000e_pre_save(void *opaque)
+static int e1000e_pre_save(void *opaque)
 {
     E1000EState *s = opaque;
 
     trace_e1000e_cb_pre_save();
 
     e1000e_core_pre_save(&s->core);
+
+    return 0;
 }
 
 static int e1000e_post_load(void *opaque, int version_id)
diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
index 3be24bbee7..d6c8188ae1 100644
--- a/hw/net/rtl8139.c
+++ b/hw/net/rtl8139.c
@@ -3162,7 +3162,7 @@ static const VMStateDescription vmstate_rtl8139_hotplug_ready ={
     }
 };
 
-static void rtl8139_pre_save(void *opaque)
+static int rtl8139_pre_save(void *opaque)
 {
     RTL8139State* s = opaque;
     int64_t current_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
@@ -3170,6 +3170,8 @@ static void rtl8139_pre_save(void *opaque)
     /* for migration to older versions */
     s->TCTR = (current_time - s->TCTR_base) / PCI_PERIOD;
     s->rtl8139_mmio_io_addr_dummy = 0;
+
+    return 0;
 }
 
 static const VMStateDescription vmstate_rtl8139 = {
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 148071a396..150fd0748e 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1712,7 +1712,7 @@ struct VirtIONetMigTmp {
  * pointer and count and also validate the count.
  */
 
-static void virtio_net_tx_waiting_pre_save(void *opaque)
+static int virtio_net_tx_waiting_pre_save(void *opaque)
 {
     struct VirtIONetMigTmp *tmp = opaque;
 
@@ -1721,6 +1721,8 @@ static void virtio_net_tx_waiting_pre_save(void *opaque)
     if (tmp->parent->curr_queues == 0) {
         tmp->curr_queues_1 = 0;
     }
+
+    return 0;
 }
 
 static int virtio_net_tx_waiting_pre_load(void *opaque)
@@ -1768,11 +1770,13 @@ static int virtio_net_ufo_post_load(void *opaque, int version_id)
     return 0;
 }
 
-static void virtio_net_ufo_pre_save(void *opaque)
+static int virtio_net_ufo_pre_save(void *opaque)
 {
     struct VirtIONetMigTmp *tmp = opaque;
 
     tmp->has_ufo = tmp->parent->has_ufo;
+
+    return 0;
 }
 
 static const VMStateDescription vmstate_virtio_net_has_ufo = {
@@ -1800,11 +1804,13 @@ static int virtio_net_vnet_post_load(void *opaque, int version_id)
     return 0;
 }
 
-static void virtio_net_vnet_pre_save(void *opaque)
+static int virtio_net_vnet_pre_save(void *opaque)
 {
     struct VirtIONetMigTmp *tmp = opaque;
 
     tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr;
+
+    return 0;
 }
 
 static const VMStateDescription vmstate_virtio_net_has_vnet = {
@@ -2079,13 +2085,15 @@ static void virtio_net_instance_init(Object *obj)
                                   DEVICE(n), NULL);
 }
 
-static void virtio_net_pre_save(void *opaque)
+static int virtio_net_pre_save(void *opaque)
 {
     VirtIONet *n = opaque;
 
     /* At this point, backend must be stopped, otherwise
      * it might keep writing to memory. */
     assert(!n->vhost_started);
+
+    return 0;
 }
 
 static const VMStateDescription vmstate_virtio_net = {
diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index a19a7a31dd..b43b58be2b 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -2388,11 +2388,13 @@ static int vmxnet3_mcast_list_pre_load(void *opaque)
 }
 
 
-static void vmxnet3_pre_save(void *opaque)
+static int vmxnet3_pre_save(void *opaque)
 {
     VMXNET3State *s = opaque;
 
     s->mcast_list_buff_size = s->mcast_list_len * sizeof(MACAddr);
+
+    return 0;
 }
 
 static const VMStateDescription vmxstate_vmxnet3_mcast_list = {