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net/virtio: update memory ordering comment for VQ notify

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We're not using IO ports in case of modern device even on IA.
Also, this comment useless for other architectures.

Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Ilya Maximets 2019-01-09 17:50:14 +03:00 committed by Ferruh Yigit
parent d21d05c7a9
commit cc827f8359
1 changed files with 4 additions and 5 deletions
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9
drivers/net/virtio/virtqueue.h
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@ -437,14 +437,13 @@ virtqueue_kick_prepare_packed(struct virtqueue *vq)
return flags != RING_EVENT_FLAGS_DISABLE;
}
/*
* virtqueue_kick_prepare*() or the virtio_wmb() should be called
* before this function to be sure that all the data is visible to vhost.
*/
static inline void
virtqueue_notify(struct virtqueue *vq)
{
/*
* Ensure updated avail->idx is visible to host.
* For virtio on IA, the notificaiton is through io port operation
* which is a serialization instruction itself.
*/
VTPCI_OPS(vq->hw)->notify_queue(vq->hw, vq);
}