Messages in this thread | | | Subject | Re: [PATCH v3 0/3] virtio DMA API core stuff | From | Marcel Apfelbaum <> | Date | Sun, 22 Nov 2015 19:04:32 +0200 |
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On 11/22/2015 05:54 PM, David Woodhouse wrote: > On Sun, 2015-11-22 at 15:06 +0200, Marcel Apfelbaum wrote: >> >> >> I tried to generate a DMAR table that excludes some devices from >> IOMMU translation, however it does not help. >> >> The reason is, as far as I understand, that Linux kernel does >> not allow any device being outside an IOMMU scope if the >> iommu kernel option is activated. >> >> Does anybody know if it is "by design" or is simply an uncommon >> configuration? >> (some devices in an IOMMU scope, while others outside *any* IOMMU >> scope) > > That's a kernel bug in the way it handles per-device DMA operations. Or > more to the point, in the way it doesn't — the non-translated devices > end up being pointed to the intel_dma_ops despite the fact they > shouldn't be. I'm working on that... >
Hi David, Thank you for the fast response.
Sadly I am not familiar with the DMA/IOMMU code to contribute with a sane idea, but I'll gladly test it. If you lack the time and have an idea to share, I can give it a try though.
Thanks, Marcel
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