static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id)
{
VirtIOBlock *s = opaque;
int ret;
if (version_id != 2)
return -EINVAL;
ret = virtio_load(&s->vdev, f);
if (ret) {
return ret;
}
while (qemu_get_sbyte(f)) {
VirtIOBlockReq *req = virtio_blk_alloc_request(s);
qemu_get_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem));
req->next = s->rq;
s->rq = req;
virtqueue_map_sg(req->elem.in_sg, req->elem.in_addr,
req->elem.in_num, 1);
virtqueue_map_sg(req->elem.out_sg, req->elem.out_addr,
req->elem.out_num, 0);
}
return 0;
}
static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f,
int version_id)
{
VirtIOBlock *s = VIRTIO_BLK(vdev);
while (qemu_get_sbyte(f)) {
VirtIOBlockReq *req = virtio_blk_alloc_request(s);
qemu_get_buffer(f, (unsigned char *)req->elem,
sizeof(VirtQueueElement));
req->next = s->rq;
s->rq = req;
virtqueue_map_sg(req->elem->in_sg, req->elem->in_addr,
req->elem->in_num, 1);
virtqueue_map_sg(req->elem->out_sg, req->elem->out_addr,
req->elem->out_num, 0);
}
return 0;
}
static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id)
{
VirtIOBlock *s = opaque;
int ret;
if (version_id != 2)
return -EINVAL;
/* RHEL only. Upstream we will fix this by ensuring that VIRTIO_BLK_F_SCSI
* is always set. This however will cause migration from new QEMU to old
* QEMU to fail if both have scsi=off. We cannot use compatibility
* properties because the scsi property is being overridden by management
* (libvirt).
*
* If RHEL7->RHEL6 migration will be supported, we'll have to disable
* VIRTIO_BLK_F_SCSI in the migration stream when running on a rhel6.x.0
* machine type with scsi=off. Otherwise SG_IO will magically start
* working on the destination.
*/
ret = virtio_load_with_features(&s->vdev, f, 1 << VIRTIO_BLK_F_SCSI);
if (ret) {
return ret;
}
while (qemu_get_sbyte(f)) {
VirtIOBlockReq *req = virtio_blk_alloc_request(s);
qemu_get_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem));
req->next = s->rq;
s->rq = req;
virtqueue_map_sg(req->elem.in_sg, req->elem.in_addr,
req->elem.in_num, 1);
virtqueue_map_sg(req->elem.out_sg, req->elem.out_addr,
req->elem.out_num, 0);
}
return 0;
}
