Am 10.11.2011 um 00:17 schrieb Andreas Färber <afaer...@suse.de>:
> Am 09.11.2011 23:53, schrieb Andreas Färber:
>> I get the following error:
>>
>> $ s390x-softmmu/qemu-system-s390x
>> qemu-system-s390x: Guest moved used index from 0 to 47802
>
> This is coming from hw/virtio.c:
>
> static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx)
> {
> uint16_t num_heads = vring_avail_idx(vq) - idx;
>
> /* Check it isn't doing very strange things with descriptor numbers. */
> if (num_heads > vq->vring.num) {
> error_report("Guest moved used index from %u to %u",
> idx, vring_avail_idx(vq));
> exit(1);
> }
>
> return num_heads;
> }
>
> Any idea? Couldn't find a related s390-specific patch on the list.
There is a good chance my simple in-zipl virtio implementation does something
wrong :(. IIRC I always keep the outstanding requests on 1 (something
outstanding) or 0 (all is done) so I can keep the logic a lot easier.
Alex
>
> Andreas
>
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