[PATCH v6 0/4] riscv, mm: detect svnapot cpu support at runtime

[Andrew Jones]

Hi Qinglin,

Please give more time between postings. v5 is barely 48 hours old and I
haven't even looked at half its patches yet.

Thanks,
drew


On Wed, Oct 05, 2022 at 07:29:22PM +0800, panqinglin2020 at iscas.ac.cn wrote:
> From: Qinglin Pan <panqinglin2020 at iscas.ac.cn>
> 
> 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 extension 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.
> Changes in v3:
>   - do linear mapping again if has_svnapot
> Changes in v4:
>   - fix some errors/warns reported by checkpatch.pl, thanks @Conor
> Changes in v5:
>   - modify code according to @Conor and @Heiko
> Changes in v6:
>   - use static key insead of alternative errata
> 
> 
> Qinglin Pan (4):
>   riscv: mm: modify pte format for Svnapot
>   riscv: mm: support Svnapot in physical page linear-mapping
>   riscv: mm: support Svnapot in hugetlb page
>   riscv: mm: support Svnapot in huge vmap
> 
>  arch/riscv/Kconfig                  |  17 +-
>  arch/riscv/include/asm/hugetlb.h    |  37 +++-
>  arch/riscv/include/asm/hwcap.h      |   4 +
>  arch/riscv/include/asm/page.h       |   2 +-
>  arch/riscv/include/asm/pgtable-64.h |  13 ++
>  arch/riscv/include/asm/pgtable.h    |  69 +++++++-
>  arch/riscv/include/asm/vmalloc.h    |  28 ++++
>  arch/riscv/kernel/cpu.c             |   1 +
>  arch/riscv/kernel/cpufeature.c      |   1 +
>  arch/riscv/mm/hugetlbpage.c         | 250 +++++++++++++++++++++++++++-
>  arch/riscv/mm/init.c                |  30 +++-
>  11 files changed, 440 insertions(+), 12 deletions(-)
> 
> -- 
> 2.35.1
>