> From: Baolu Lu <[email protected]> > Sent: Tuesday, November 18, 2025 2:24 PM > > On 11/18/25 12:04, Tian, Kevin wrote: > >> 46 bits is not particularly big... Hmm, I wonder if we have some issue > >> with the sign-extend? iommupt does that properly and IIRC the old code > >> did not. Which of the page table formats is this using second stage or > >> first stage? > > Assume it's first stage for kernel IOVA, if available in hw > > It's the first stage (x86_64 fmt) according to the PASID entry setup: > > IOMMU dmar0: Root Table Address: 0x105a82000 > B.D.F Root_entry Context_entry > PASID PASID_table_entry > 00:02.0 0x0000000000000000:0x0000000105a85001 > 0x0000000000000000:0x0000000105a84405 0 > 0x0000000105a86000:0x0000000000000002:0x0000000000000049 >
so the 3rd experiment (if the former two doesn't show difference) is to force using second stage to see whether it's caused by the sign-extend logic.
