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KVM: s390: virtio-ccw revision 1 SET_VQ

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The CCW_CMD_SET_VQ command has a different format for revision 1+
devices, allowing to specify a more complex virtqueue layout. For
now, we stay however with the old layout and simply use the new
command format for virtio-1 devices.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
This commit is contained in:
Cornelia Huck 2014-10-07 16:39:51 +02:00 committed by Michael S. Tsirkin
parent 6bb2c835c7
commit d4674240f3
1 changed files with 42 additions and 12 deletions
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54
drivers/s390/kvm/virtio_ccw.c
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@ -68,13 +68,22 @@ struct virtio_ccw_device {
void *airq_info;
};
struct vq_info_block {
struct vq_info_block_legacy {
__u64 queue;
__u32 align;
__u16 index;
__u16 num;
} __packed;
struct vq_info_block {
__u64 desc;
__u32 res0;
__u16 index;
__u16 num;
__u64 avail;
__u64 used;
} __packed;
struct virtio_feature_desc {
__u32 features;
__u8 index;
@ -100,7 +109,10 @@ struct virtio_ccw_vq_info {
struct virtqueue *vq;
int num;
void *queue;
struct vq_info_block *info_block;
union {
struct vq_info_block s;
struct vq_info_block_legacy l;
} *info_block;
int bit_nr;
struct list_head node;
long cookie;
@ -411,13 +423,22 @@ static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
spin_unlock_irqrestore(&vcdev->lock, flags);
/* Release from host. */
info->info_block->queue = 0;
info->info_block->align = 0;
info->info_block->index = index;
info->info_block->num = 0;
if (vcdev->revision == 0) {
info->info_block->l.queue = 0;
info->info_block->l.align = 0;
info->info_block->l.index = index;
info->info_block->l.num = 0;
ccw->count = sizeof(info->info_block->l);
} else {
info->info_block->s.desc = 0;
info->info_block->s.index = index;
info->info_block->s.num = 0;
info->info_block->s.avail = 0;
info->info_block->s.used = 0;
ccw->count = sizeof(info->info_block->s);
}
ccw->cmd_code = CCW_CMD_SET_VQ;
ccw->flags = 0;
ccw->count = sizeof(*info->info_block);
ccw->cda = (__u32)(unsigned long)(info->info_block);
ret = ccw_io_helper(vcdev, ccw,
VIRTIO_CCW_DOING_SET_VQ | index);
@ -500,13 +521,22 @@ static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
}
/* Register it with the host. */
info->info_block->queue = (__u64)info->queue;
info->info_block->align = KVM_VIRTIO_CCW_RING_ALIGN;
info->info_block->index = i;
info->info_block->num = info->num;
if (vcdev->revision == 0) {
info->info_block->l.queue = (__u64)info->queue;
info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
info->info_block->l.index = i;
info->info_block->l.num = info->num;
ccw->count = sizeof(info->info_block->l);
} else {
info->info_block->s.desc = (__u64)info->queue;
info->info_block->s.index = i;
info->info_block->s.num = info->num;
info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);
info->info_block->s.used = (__u64)virtqueue_get_used(vq);
ccw->count = sizeof(info->info_block->s);
}
ccw->cmd_code = CCW_CMD_SET_VQ;
ccw->flags = 0;
ccw->count = sizeof(*info->info_block);
ccw->cda = (__u32)(unsigned long)(info->info_block);
err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
if (err) {