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s390/ipl: Fix waiting for virtio processing

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The guest side must not manipulate the index for the used buffers. Instead,
remember the state of the used buffer locally and wait until it has moved.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Cornelia Huck 2013-08-29 17:52:43 +02:00 • committed by Christian Borntraeger
parent abd137a1bc
commit 441ea695f9
2 changed files with 5 additions and 3 deletions
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pc-bios/s390-ccw/virtio.h
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@ -115,6 +115,7 @@ struct vring_used {
struct vring {
unsigned int num;
int next_idx;
int used_idx;
struct vring_desc *desc;
struct vring_avail *avail;
struct vring_used *used;