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

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Message-ID: <ZLjSsmTfcpaL6H/I@infradead.org>
Date: Wed, 19 Jul 2023 23:22:42 -0700
From: Christoph Hellwig <hch@...radead.org>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Christoph Hellwig <hch@...radead.org>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	virtualization@...ts.linux-foundation.org,
	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
Subject: Re: [PATCH vhost v11 05/10] virtio_ring: introduce
 virtqueue_dma_dev()

On Thu, Jul 13, 2023 at 10:51:59AM -0400, Michael S. Tsirkin wrote:
> On Thu, Jul 13, 2023 at 04:15:16AM -0700, Christoph Hellwig wrote:
> > 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..
> 
> More specifically?

Because now you expose a device that can't be used for the non-dma
mapping case and shoud be hidden.