Re: Support SVM without PASID

[Bob Liu <liubo95@huawei.com>]

On 2017/7/9 11:15, valmiki wrote:
>>> Hi,
>>>
>>> In SMMUv3 architecture document i see "PASIDs are optional,
>>> configurable, and of a size determined by the minimum
>>> of the endpoint".
>>>
>>> So if PASID's are optional and not supported by PCIe end point, how SVM
>>> can be achieved ?
>>
>> It cannot be inferred from that statement that PASID support is not
>> required for SVM.  AIUI, SVM is a software feature enabled by numerous
>> "optional" hardware features, including PASID.  Features that are
>> optional per the hardware specification may be required for specific
>> software features.  Thanks,
>>
> Thanks for the information Alex. Suppose if an End point doesn't support
> PASID, is it still possible to achieve SVM ?
> Are there any such features in SMMUv3 with which we can achieve it ?
> 

I don't think so.
But one option is your device has an internal MMU. e.g Nvidia GPU.

Thanks,
Bob Liu