[v4,0/4] RISC-V: mm: Make SV48 the default address space

Message

Charlie Jenkins July 8, 2023, 1:11 a.m. UTC

Make sv48 the default address space for mmap as some applications
currently depend on this assumption. Also enable users to select
desired address space using a non-zero hint address to mmap. Previous
kernel changes caused Java and other applications to be broken on sv57
which this patch fixes.

Documentation is also added to the RISC-V virtual memory section to explain
these changes.

-Charlie

---
v4:
- Split testcases/document patch into test cases, in-code documentation, and
  formal documentation patches
- Modified the mmap_base macro to be more legible and better represent memory
  layout
- Fixed documentation to better reflect the implmentation
- Renamed DEFAULT_VA_BITS to MMAP_VA_BITS
- Added additional test case for rlimit changes
---

Charlie Jenkins (4):
  RISC-V: mm: Restrict address space for sv39,sv48,sv57
  RISC-V: mm: Add tests for RISC-V mm
  RISC-V: mm: Update pgtable comment documentation
  RISC-V: mm: Document mmap changes

 Documentation/riscv/vm-layout.rst             |  22 +++
 arch/riscv/include/asm/elf.h                  |   2 +-
 arch/riscv/include/asm/pgtable.h              |  21 ++-
 arch/riscv/include/asm/processor.h            |  43 +++++-
 tools/testing/selftests/riscv/Makefile        |   2 +-
 tools/testing/selftests/riscv/mm/.gitignore   |   1 +
 tools/testing/selftests/riscv/mm/Makefile     |  21 +++
 .../selftests/riscv/mm/testcases/mmap.c       | 133 ++++++++++++++++++
 8 files changed, 232 insertions(+), 13 deletions(-)
 create mode 100644 tools/testing/selftests/riscv/mm/.gitignore
 create mode 100644 tools/testing/selftests/riscv/mm/Makefile
 create mode 100644 tools/testing/selftests/riscv/mm/testcases/mmap.c