16 May
2025
16 May
'25
11:57 a.m.
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