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vhost: Track number of descs in SVQDescState

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A guest's buffer continuos on GPA may need multiple descriptors on
qemu's VA, so SVQ should track its length sepparatedly.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Eugenio Pérez 2022-07-20 08:59:35 +02:00 committed by Jason Wang
parent 9e87868fca
commit ac4cfdc6f3
2 changed files with 8 additions and 2 deletions
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4
hw/virtio/vhost-shadow-virtqueue.c
View File

@ -257,6 +257,7 @@ static int vhost_svq_add(VhostShadowVirtqueue *svq, const struct iovec *out_sg,
}
svq->desc_state[qemu_head].elem = elem;
svq->desc_state[qemu_head].ndescs = ndescs;
vhost_svq_kick(svq);
return 0;
}
@ -418,8 +419,7 @@ static VirtQueueElement *vhost_svq_get_buf(VhostShadowVirtqueue *svq,
return NULL;
}
num = svq->desc_state[used_elem.id].elem->in_num +
svq->desc_state[used_elem.id].elem->out_num;
num = svq->desc_state[used_elem.id].ndescs;
last_used_chain = vhost_svq_last_desc_of_chain(svq, num, used_elem.id);
svq->desc_next[last_used_chain] = svq->free_head;
svq->free_head = used_elem.id;

6
hw/virtio/vhost-shadow-virtqueue.h
View File

@ -17,6 +17,12 @@
typedef struct SVQDescState {
VirtQueueElement *elem;
/*
* Number of descriptors exposed to the device. May or may not match
* guest's
*/
unsigned int ndescs;
} SVQDescState;
/* Shadow virtqueue to relay notifications */