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Subject: Re: [PATCH 5/5] virtio: Add bounce DMA ops

On 29.04.20 12:20, Michael S. Tsirkin wrote:
On Wed, Apr 29, 2020 at 03:39:53PM +0530, Srivatsa Vaddagiri wrote:
That would still not work I think where swiotlb is used for pass-thr devices
(when private memory is fine) as well as virtio devices (when shared memory is

So that is a separate question. When there are multiple untrusted
devices, at the moment it looks like a single bounce buffer is used.

Which to me seems like a security problem, I think we should protect
untrusted devices from each other.

Definitely. That's the model we have for ivshmem-virtio as well.


Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux

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