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virtio-balloon: Check if balloon registration failed

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Multiple balloon registrations are not allowed; check if the
registration with the qemu balloon api succeeded.  If not, fail the
device init.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Amit Shah 2011-07-27 12:29:33 +05:30 committed by Anthony Liguori
parent 6c6ec1821a
commit f76f665547
2 changed files with 11 additions and 1 deletions
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9
hw/virtio-balloon.c
View File

@ -269,6 +269,7 @@ static int virtio_balloon_load(QEMUFile *f, void *opaque, int version_id)
VirtIODevice *virtio_balloon_init(DeviceState *dev)
{
VirtIOBalloon *s;
int ret;
s = (VirtIOBalloon *)virtio_common_init("virtio-balloon",
VIRTIO_ID_BALLOON,
@ -278,12 +279,18 @@ VirtIODevice *virtio_balloon_init(DeviceState *dev)
s->vdev.set_config = virtio_balloon_set_config;
s->vdev.get_features = virtio_balloon_get_features;
ret = qemu_add_balloon_handler(virtio_balloon_to_target,
virtio_balloon_stat, s);
if (ret < 0) {
virtio_cleanup(&s->vdev);
return NULL;
}
s->ivq = virtio_add_queue(&s->vdev, 128, virtio_balloon_handle_output);
s->dvq = virtio_add_queue(&s->vdev, 128, virtio_balloon_handle_output);
s->svq = virtio_add_queue(&s->vdev, 128, virtio_balloon_receive_stats);
reset_stats(s);
qemu_add_balloon_handler(virtio_balloon_to_target, virtio_balloon_stat, s);
register_savevm(dev, "virtio-balloon", -1, 1,
virtio_balloon_save, virtio_balloon_load, s);

3
hw/virtio-pci.c
View File

@ -788,6 +788,9 @@ static int virtio_balloon_init_pci(PCIDevice *pci_dev)
VirtIODevice *vdev;
vdev = virtio_balloon_init(&pci_dev->qdev);
if (!vdev) {
return -1;
}
virtio_init_pci(proxy, vdev);
return 0;
}