Re: [PATCH 0/2] x86: per-device dma_mapping_ops

[Andi Kleen]

Muli Ben-Yehuda wrote:
> On Thu, May 15, 2008 at 11:03:40PM +0200, Andi Kleen wrote:
>> On Thu, May 15, 2008 at 06:26:31PM +0300, Muli Ben-Yehuda wrote:
>>> On Thu, May 15, 2008 at 06:41:26PM +0900, FUJITA Tomonori wrote:
>>>
>>>> I thought that KVM people want to do it per device (in the first
>>>> case). So with my patchse, they can replace the dma_ops pointer
>>>> in dev_archdata with what they want.
>>> That's my understanding too. We use stackable ops as a poor man's
>>> replacement for per-device ops (depending on what kind of device
>>> it is, call the original ops or our pvdma ops).
>> But in the KVM case you still need to support the underlying ops
>> too, e.g. in case of bouncing through swiotlb needed
> 
> Good point, although "secondary" DMA-ops should only be needed in rare
> cases 

Even rare cases need to be handled. In the nodma bitmap case it was the
same always btw

-Andi

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