Re: [PATCH v4 0/6] virtio core DMA API conversion

[Andy Lutomirski]

On Mon, Nov 9, 2015 at 9:26 PM, Benjamin Herrenschmidt
<benh@xxxxxxxxxxxxxxxxxxx> 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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