RE: Support SVM without PASID

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> -----Original Message-----
> From: iommu-bounces@xxxxxxxxxxxxxxxxxxxxxxxxxx [mailto:iommu-
> bounces@xxxxxxxxxxxxxxxxxxxxxxxxxx] On Behalf Of valmiki
> Sent: Sunday, July 9, 2017 11:16 AM
> To: Alex Williamson <alex.williamson@xxxxxxxxxx>
> Cc: Lan, Tianyu <tianyu.lan@xxxxxxxxx>; Tian, Kevin <kevin.tian@xxxxxxxxx>;
> kvm@xxxxxxxxxxxxxxx; linux-pci@xxxxxxxxxxxxxxx; iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx;
> Pan, Jacob jun <jacob.jun.pan@xxxxxxxxx>
> Subject: Re: Support SVM without PASID
> 
> >> 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 ?

If endpoint has no PASID support, I don't think it is SVM capable. For SMMU, maybe
you can get more info from Jean.

Regards,
Yi L



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