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

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Message-ID: <20200429103438.GF5097@quicinc.com>
Date:   Wed, 29 Apr 2020 16:04:40 +0530
From:   Srivatsa Vaddagiri <vatsa@...eaurora.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
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

* Michael S. Tsirkin <mst@...hat.com> [2020-04-29 06:20:48]:

> 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.

I think as first step, let me see if we can make swiotlb driver accept a target
memory segment as its working area. That may suffice our needs I think.  A
subsequent step could be to make swiotlb driver recognize multiple pools.


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