On 7/14/26 07:04, Kevin Brodsky wrote: > tboot_mm is a kernel-owned address space used to build the > identity map for tboot shutdown. Mark it with MMF_KERNEL so > page table allocation and initialisation code treats its page tables > as kernel page tables. > > Having marked tboot_mm as a kernel mm, we also need to convert > pte_alloc_map() (user PTE) to pte_alloc_kernel() (kernel PTE), and > drop the matching pte_unmap().
This makes me wonder whether MMF_KERNEL is the right way to mark these mms. I think this series tries to cram too much into that one bit. Using MMF_KERNEL to drive the page table accounting seems like a good idea. It also seems like a good thing to make sure that those mm's don't ever exit to userspace, for instance. But I think it goes a step too far to say that all the special 'init_mm' TLB flushing should also be common among all MMF_KERNEL mms. My suggestion for now would be to just go after the page table accounting alone. Don't mechanically replace mm==&mm_init checks.
