> From: Tian, Kevin > Sent: Thursday, December 9, 2021 10:58 AM > > For ARM it's SMMU's PASID table format. There is no step-2 since PASID > is already within the address space covered by the user PASID table. > One correction here. 'no step-2' is definitely wrong here as it means more than user page table in your plan (e.g. dpdk). To simplify it what I meant is: iommufd reports how many 'user page tables' are supported given a device. ARM always reports only one can be supported, and it must be created in PASID table format. tagged by RID. Intel reports one in step1 (tagged by RID), and N in step2 (tagged by RID+PASID). A special flag in attach call allows the user to specify the additional PASID routing info for a 'user page table'. Thanks Kevin _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
