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... -- dwmw2
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