On Thu, Jun 16, 2022 at 10:52:14PM +0000, Edgecombe, Rick P wrote: > On Fri, 2022-06-10 at 17:35 +0300, Kirill A. Shutemov wrote: > > Linear Address Masking[1] (LAM) modifies the checking that is applied > > to > > 64-bit linear addresses, allowing software to use of the untranslated > > address bits for metadata. > > > > The patchset brings support for LAM for userspace addresses. > > Arm has this documentation about which memory operations support being > passed tagged pointers, and which do not: > Documentation/arm64/tagged-address-abi.rst > > Is the idea that LAM would have something similar, or exactly mirror > the arm ABI? It seems like it is the same right now. Should the docs be > generalized? It is somewhat similar, but not exact. ARM TBI interface implies tag size and placement. ARM TBI is per-thread and LAM is per-process. -- Kirill A. Shutemov
