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

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Message-ID: <20200429064458-mutt-send-email-mst@kernel.org>
Date:   Wed, 29 Apr 2020 06:45:10 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     Srivatsa Vaddagiri <vatsa@...eaurora.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>, tsoni@...eaurora.org,
        virtio-dev@...ts.oasis-open.org, konrad.wilk@...cle.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 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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> Siemens AG, Corporate Technology, CT RDA IOT SES-DE
> Corporate Competence Center Embedded Linux