On 11/25/24 09:05, David Woodhouse wrote: > Not sure I like this very much, but it works, and mirrors what > arch/x86/boot/compressed/ident_map_64.c already does. I don't like it much, either. arch/x86/boot/compressed/ is already on the road to sharing no code with the core kernel and it's full of horrors. It should be an example of what *not* to do. ;) I think we have a lot of software-available space in the page table pointer entries. What would folks think if we set a special bit in those p4d entries that said: "I don't need to be propagated to the user portion of the page tables." It would obviously get set in this code that you're trying to fix. It might _also_ be able to be set in in "_USR", like here: #define _KERNPG_TABLE_NOENC (__PP|__RW| 0|___A| 0|___D| 0| 0) #define _PAGE_TABLE_NOENC (__PP|__RW|_USR|___A| 0|___D| 0| 0) like: #define _USR _PAGE_USER|_PAGE_SW_WHATEVER
