Thanks Alex for your time. I think I may have found the issue. Right now, when doing a dma-unmapping, we do a "soft-unmapping" only, as the pte-values themselves are not cleared in the unlinked pagetable-frame. I have made the (simple) changes, and things are looking good as of now (almost an hour now). However, this time I will give it a day ;) If there is not a single-flooding observed in the next 24 hours, I would float the v2 patch for review. Thanks again for your time and patience. Thanks and Regards, Ajay > > Even this QEMU explanation doesn't make a lot of sense, vfio tracks > userspace mappings and will return an -EEXIST error for duplicate or > overlapping IOVA entries. We expect to have an entirely empty IOMMU > domain when a device is assigned, but it seems the only way userspace > can trigger duplicate PTEs would be if mappings already exist, or we > have a bug somewhere. > > If the most recent instance is purely on bare metal, then it seems the > host itself has conflicting mappings. I can only speculate with the > limited data presented, but I'm suspicious there's something happening > with RMRRs here (but that should also entirely preclude assignment). > dmesg, lspci -vvv, and VM configuration would be useful. Thanks, > > Alex >
