Messages in this thread | | | Date | Thu, 30 Apr 2020 11:20:08 -0400 | From | Konrad Rzeszutek Wilk <> | Subject | Re: [PATCH 5/5] virtio: Add bounce DMA ops |
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On Wed, Apr 29, 2020 at 06:20:48AM -0400, 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.
There are two DMA pools code in Linux already - the TTM one for graphics and the mm/dmapool.c - could those be used instead? Or augmented at least?
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