[PATCH v3 1/8] qemu:virtio-net: Save status and add some save infrastructure

[Alex Williamson <alex.williamson@xxxxxx>]

The status register should probably be saved since its guest visible.
Also add a little bit if infrastructure for handling various save
revisions.

Signed-off-by: Alex Williamson <alex.williamson@xxxxxx>
---

 hw/virtio-net.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index 9e40678..2eb52b8 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -16,6 +16,8 @@
 #include "qemu-timer.h"
 #include "virtio-net.h"
 
+#define VIRTIO_NET_VM_VERSION    3
+
 typedef struct VirtIONet
 {
     VirtIODevice vdev;
@@ -292,13 +294,14 @@ static void virtio_net_save(QEMUFile *f, void *opaque)
     qemu_put_buffer(f, n->mac, 6);
     qemu_put_be32(f, n->tx_timer_active);
     qemu_put_be32(f, n->mergeable_rx_bufs);
+    qemu_put_be16(f, n->status);
 }
 
 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
 {
     VirtIONet *n = opaque;
 
-    if (version_id != 2)
+    if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
         return -EINVAL;
 
     virtio_load(&n->vdev, f);
@@ -307,6 +310,9 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
     n->tx_timer_active = qemu_get_be32(f);
     n->mergeable_rx_bufs = qemu_get_be32(f);
 
+    if (version_id >= 3)
+        n->status = qemu_get_be16(f);
+
     if (n->tx_timer_active) {
         qemu_mod_timer(n->tx_timer,
                        qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
@@ -348,6 +354,6 @@ void virtio_net_init(PCIBus *bus, NICInfo *nd, int devfn)
     n->tx_timer_active = 0;
     n->mergeable_rx_bufs = 0;
 
-    register_savevm("virtio-net", virtio_net_id++, 2,
+    register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
                     virtio_net_save, virtio_net_load, n);
 }

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