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virtio-net migration fix (Mark McLoughlin)

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We are failing to save whether the guest will supply us rx
buffers using the new mergeable format; this can cause a
migrated guest to crash with:

   virtio-net header not in first element

Bump the savevm version number and refuse to load v1 saves
just to be on the safe side.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6221 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-01-07 17:50:45 +00:00
parent 7a9f6e4a8d
commit e46cb38f13
1 changed files with 4 additions and 2 deletions
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6
hw/virtio-net.c
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@ -275,19 +275,21 @@ 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);
}
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
{
VirtIONet *n = opaque;
if (version_id != 1)
if (version_id != 2)
return -EINVAL;
virtio_load(&n->vdev, f);
qemu_get_buffer(f, n->mac, 6);
n->tx_timer_active = qemu_get_be32(f);
n->mergeable_rx_bufs = qemu_get_be32(f);
if (n->tx_timer_active) {
qemu_mod_timer(n->tx_timer,
@ -324,7 +326,7 @@ PCIDevice *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++, 1,
register_savevm("virtio-net", virtio_net_id++, 2,
virtio_net_save, virtio_net_load, n);
return (PCIDevice *)n;