On Mon, 2016-04-18 at 16:12 +0300, Michael S. Tsirkin wrote: > I'm not sure I understand the issue. The public API is not about how > the driver works. It doesn't say "don't use DMA API" anywhere, does it? > It's about telling device whether to obey the IOMMU and > about discovering whether a device is in fact under the IOMMU. Apologies, I was wrongly reading this as a kernel patch. After a brief struggle with "telling device whether to obey the IOMMU", which is obviously completely impossible from the guest kernel, I realise my mistake :) So... on x86 how does this get reflected in the DMAR tables that the guest BIOS presents to the guest kernel, so that the guest kernel *knows* which devices are behind which IOMMU? (And are you fixing the case of assigned PCI devices, which aren't behind any IOMMU, at the same time as you answer that? :) -- dwmw2
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