On Fri, May 16, 2025 at 04:30:23PM +0800, Yi Liu wrote: > On 2025/5/5 22:18, Jason Gunthorpe wrote: > > AMD IOMMU v1 is unique in supporting contiguous pages with a variable size > > and it can decode the full 64 bit VA space. Unlike other x86 page tables > > this explicitly does not do sign extension as part of allowing the entire > > 64 bit VA space to be supported. > > aha, do you mean the canonical requirement on the addresses when talking > the singn extension? yes > Actually, VT-d 2nd-stage page tables does not require it as well. right Jason
