On 03/19/2013 06:28 PM, Matthew Garrett wrote:
> Mm. The question is whether we can reliably determine the ranges a device
> should be able to access without having to trust userspace (and, ideally,
> without having to worry about whether iommu vendors have done their job).
> It's pretty important for PCI passthrough, so we do need to care.
It is actually very simple: the device should be able to DMA into/out of:
1. pinned pages
2. owned by the process controlling the device
... and nothing else.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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