Messages in this thread | | | From | Andy Lutomirski <> | Date | Mon, 9 Nov 2015 21:33:07 -0800 | Subject | Re: [PATCH v4 0/6] virtio core DMA API conversion |
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On Mon, Nov 9, 2015 at 9:26 PM, Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote: > On Mon, 2015-11-09 at 18:18 -0800, Andy Lutomirski wrote: >> >> Which leaves the special case of Xen, where even preexisting devices >> don't bypass the IOMMU. Can we keep this specific to powerpc and >> sparc? On x86, this problem is basically nonexistent, since the IOMMU >> is properly self-describing. >> >> IOW, I think that on x86 we should assume that all virtio devices >> honor the IOMMU. > > You don't like performances ? :-)
This should have basically no effect. Every non-experimental x86 virtio setup in existence either doesn't work at all (Xen) or has DMA ops that are no-ops.
--Andy
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