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

Michael S. Tsirkin
2020-04-29T10:45:21Z

On Wed, Apr 29, 2020 at 12:26:43PM +0200, Jan Kiszka wrote:
> 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
> > > required).
> >
> > 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.
>
> Jan

Want to try implementing that?

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