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

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Date:   Wed, 29 Apr 2020 06:20:48 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Srivatsa Vaddagiri <vatsa@...eaurora.org>
Cc:     Lu Baolu <baolu.lu@...ux.intel.com>, tsoni@...eaurora.org,
        virtio-dev@...ts.oasis-open.org, konrad.wilk@...cle.com,
        jan.kiszka@...mens.com, jasowang@...hat.com,
        christoffer.dall@....com,
        virtualization@...ts.linux-foundation.org, alex.bennee@...aro.org,
        iommu@...ts.linux-foundation.org, stefano.stabellini@...inx.com,
        will@...nel.org, linux-kernel@...r.kernel.org,
        pratikp@...eaurora.org
Subject: Re: [PATCH 5/5] virtio: Add bounce DMA ops

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.





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