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290c5b5401
The vm_create() helpers are hardcoded to place most page types (code, page-tables, stacks, etc) in the same memslot #0, and always backed with anonymous 4K. There are a couple of issues with that. First, tests willing to differ a bit, like placing page-tables in a different backing source type must replicate much of what's already done by the vm_create() functions. Second, the hardcoded assumption of memslot #0 holding most things is spread everywhere; this makes it very hard to change. Fix the above issues by having selftests specify how they want memory to be laid out. Start by changing ____vm_create() to not create memslot #0; a test (to come) will specify all memslots used by the VM. Then, add the vm->memslots[] array to specify the right memslot for different memory allocators, e.g.,: lib/elf should use the vm->[MEM_REGION_CODE] memslot. This will be used as a way to specify the page-tables memslots (to be backed by huge pages for example). There is no functional change intended. The current commit lays out memory exactly as before. A future commit will change the allocators to get the region they should be using, e.g.,: like the page table allocators using the pt memslot. Cc: Sean Christopherson <seanjc@google.com> Cc: Andrew Jones <andrew.jones@linux.dev> Signed-off-by: Ricardo Koller <ricarkol@google.com> Reviewed-by: Andrew Jones <andrew.jones@linux.dev> Reviewed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20221017195834.2295901-8-ricarkol@google.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.