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From: Jason Wang <jasowang@redhat.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: mst@redhat.com, virtualization@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org, xieyongji@bytedance.com,
	stefanha@redhat.com, file@sect.tu-berlin.de,
	ashish.kalra@amd.com, martin.radev@aisec.fraunhofer.de,
	konrad.wilk@oracle.com, kvm@vger.kernel.org
Subject: Re: [RFC PATCH 0/7] Untrusted device support for virtio
Date: Thu, 22 Apr 2021 16:19:16 +0800
Message-ID: <0c61dcbb-ac5b-9815-a4a1-5f93ae640011@redhat.com> (raw)
In-Reply-To: <20210422063128.GB4176641@infradead.org>

在 2021/4/22 下午2:31, Christoph Hellwig 写道:
> On Wed, Apr 21, 2021 at 11:21:10AM +0800, Jason Wang wrote:
>> The behaivor for non DMA API is kept for minimizing the performance
>> impact.
> NAK.  Everyone should be using the DMA API in a modern world.  So
> treating the DMA API path worse than the broken legacy path does not
> make any sense whatsoever.

I think the goal is not treat DMA API path worse than legacy. The issue 
is that the management layer should guarantee that ACCESS_PLATFORM is 
set so DMA API is guaranteed to be used by the driver. So I'm not sure 
how much value we can gain from trying to 'fix' the legacy path. But I 
can change the behavior of legacy path to match DMA API path.


  reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-21  3:21 Jason Wang
2021-04-21  3:21 ` [RFC PATCH 1/7] virtio-ring: maintain next in extra state for packed virtqueue Jason Wang
2021-04-21  3:21 ` [RFC PATCH 2/7] virtio_ring: rename vring_desc_extra_packed Jason Wang
2021-04-21  3:21 ` [RFC PATCH 3/7] virtio-ring: factor out desc_extra allocation Jason Wang
2021-04-21  3:21 ` [RFC PATCH 4/7] virtio_ring: secure handling of mapping errors Jason Wang
2021-04-21  3:21 ` [RFC PATCH 5/7] virtio_ring: introduce virtqueue_desc_add_split() Jason Wang
2021-04-21  3:21 ` [RFC PATCH 6/7] virtio: use err label in __vring_new_virtqueue() Jason Wang
2021-04-21  3:21 ` [RFC PATCH 7/7] virtio-ring: store DMA metadata in desc_extra for split virtqueue Jason Wang
2021-04-22  6:31 ` [RFC PATCH 0/7] Untrusted device support for virtio Christoph Hellwig
2021-04-22  8:19   ` Jason Wang [this message]
2021-04-23 20:14     ` Michael S. Tsirkin
2021-04-25  1:43       ` Jason Wang
2021-04-28 21:06 ` Konrad Rzeszutek Wilk
2021-04-29  4:16   ` Jason Wang
2021-06-04 15:17     ` Konrad Rzeszutek Wilk
2021-06-07  2:46       ` Jason Wang

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