[v2,0/4] riscv: mm: add Svnapot support

Message

Qinglin Pan July 16, 2022, 8:56 a.m. UTC

From: Qinglin Pan <[e-mail]>

Svnapot is a RISC-V extension for marking contiguous 4K pages as a non-4K
page. This patch set is for using Svnapot in Linux Kernel's boot process
and hugetlb fs.

This patchset adds a Kconfig item for using Svnapot in
"Platform type"->"Svnapot support". Its default value is off, and people can set
it on if they allow kernel to detect Svnapot hardware support and leverage it.

Tested on:
  - qemu rv64 with "Svnapot support" off and svnapot=true.
  - qemu rv64 with "Svnapot support" on and svnapot=true.
  - qemu rv64 with "Svnapot support" off and svnapot=false.
  - qemu rv64 with "Svnapot support" on and svnapot=false.

Changes in v2:
  - detect Svnapot hardware support at boot time.

Qinglin Pan (4):
  mm: modify pte format for Svnapot
  mm: support Svnapot in physical page linear-mapping
  mm: support Svnapot in hugetlb page
  mm: support Svnapot in huge vmap

 arch/riscv/Kconfig                   |  10 +-
 arch/riscv/include/asm/errata_list.h |  24 ++-
 arch/riscv/include/asm/hugetlb.h     |  31 +++-
 arch/riscv/include/asm/hwcap.h       |   1 +
 arch/riscv/include/asm/page.h        |   2 +-
 arch/riscv/include/asm/pgtable-64.h  |  14 ++
 arch/riscv/include/asm/pgtable.h     |  67 +++++++-
 arch/riscv/include/asm/vmalloc.h     |  20 +++
 arch/riscv/kernel/cpu.c              |   1 +
 arch/riscv/kernel/cpufeature.c       |  18 ++
 arch/riscv/mm/hugetlbpage.c          | 239 ++++++++++++++++++++++++++-
 arch/riscv/mm/init.c                 |  28 +++-
 12 files changed, 442 insertions(+), 13 deletions(-)