On Mon, 2023-02-13 at 17:02 +0800, Binbin Wu wrote: > > 3. For user mode address, it is possible that 5-level paging and > > LAM_U48 are both > > set, in this case, the effective usable linear address width is > > 48, i.e. bit > > 56:47 is reserved by LAM. [2] > > How to understand "reserved by LAM"? > > According to the spec, bits 56:48 of the pointer contained metadata. > Emm, looks it's superfluous words, I'll remove it in next version. I meant the same as your understanding: bit 56:48 could be used by metadata, and cleared before translation, therefore not usable by 5- level paging, "reserved by LAM".
