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[1] >>>> >>>> To support domain replacement, the definition of the set_dev_pasid op >>>> needs to be enhanced. Meanwhile, the existing set_dev_pasid callbacks >>>> should be extended as well to suit the new definition. >>> >>> IIUC this will remove PASID from old SVA domain and attaches to new SVA domain. >>> (basically attaching same dev/PASID to different process). Is that the correct? >> >> In brief, yes. But it's not only for SVA domain. Remember that SIOVr1 >> extends the usage of PASID. At least on Intel side, a PASID may be >> attached to paging domains. > > You are correct. Thanks. > > The idxd driver attaches a paging domain to a non-zero PASID for kernel > DMA with PASID. From an architectural perspective, other architectures, > like ARM, AMD, and RISC-V, also support this. Therefore, attaching a > paging domain to a PASID is not Intel-specific but a generic feature. Right. We can enhance AMD driver to support attaching PASID to paging/UNMANAGED domains. It needs some more rework/cleanup before we do that. -Vasant