> -----Original Message----- > From: iommu-boun...@lists.linux-foundation.org [mailto:iommu- > boun...@lists.linux-foundation.org] On Behalf Of valmiki > Sent: Sunday, July 9, 2017 11:16 AM > To: Alex Williamson <alex.william...@redhat.com> > Cc: Lan, Tianyu <tianyu....@intel.com>; Tian, Kevin <kevin.t...@intel.com>; > k...@vger.kernel.org; linux-...@vger.kernel.org; > iommu@lists.linux-foundation.org; > Pan, Jacob jun <jacob.jun....@intel.com> > 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 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
