netdev - Re: [PATCH vhost v11 05/10] virtio_ring: introduce virtqueue_dma

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Message-ID: <ZK/cxNHzI23I6efc@infradead.org>
Date: Thu, 13 Jul 2023 04:15:16 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc: virtualization@...ts.linux-foundation.org,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>, netdev@...r.kernel.org,
	bpf@...r.kernel.org, Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH vhost v11 05/10] virtio_ring: introduce
 virtqueue_dma_dev()

On Mon, Jul 10, 2023 at 11:42:32AM +0800, Xuan Zhuo wrote:
> Added virtqueue_dma_dev() to get DMA device for virtio. Then the
> caller can do dma operation in advance. The purpose is to keep memory
> mapped across multiple add/get buf operations.

This is just poking holes into the abstraction..