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Groups > linux.kernel > #1274907
| From | Marcel Apfelbaum <marcel@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v3 0/3] virtio DMA API core stuff |
| Date | 2015-11-22 18:10 +0100 |
| Message-ID | <qxGjg-6O6-7@gated-at.bofh.it> (permalink) |
| References | (8 earlier) <qoY5J-2tW-27@gated-at.bofh.it> <qsvy9-7nD-15@gated-at.bofh.it> <qswNA-86y-21@gated-at.bofh.it> <qxCyZ-4di-7@gated-at.bofh.it> <qxFdx-5OZ-19@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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Re: [PATCH v3 0/3] virtio DMA API core stuff Marcel Apfelbaum <marcel.apfelbaum@gmail.com> - 2015-11-22 14:10 +0100
Re: [PATCH v3 0/3] virtio DMA API core stuff David Woodhouse <dwmw2@infradead.org> - 2015-11-22 17:00 +0100
Re: [PATCH v3 0/3] virtio DMA API core stuff Marcel Apfelbaum <marcel@redhat.com> - 2015-11-22 18:10 +0100
Re: [PATCH v3 0/3] virtio DMA API core stuff "Michael S. Tsirkin" <mst@redhat.com> - 2015-11-22 23:20 +0100
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