Re: [PATCH net-next] xsk: introduce xsk_dma_ops

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On Tue, Apr 25, 2023 at 04:12:05AM -0400, Michael S. Tsirkin wrote:
> In theory, absolutely. In practice modern virtio devices are ok,
> the reason we are stuck supporting old legacy ones is because legacy
> devices are needed to run old guests. And then people turn
> around and run a new guest on the same device,
> for example because they switch back and forth e.g.
> for data recovery? Or because whoever is selling the
> host wants to opt for maximum compatibility.
> Teaching all of linux to sometimes use dma and sometimes not
> is a lot of work, and for limited benefit of these legacy systems.

It's not like virtio is the only case where blindly assuming
your can use DMA operations in a higher layer is the problem..
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