[PATCH v11 0/3] riscv, mm: detect svnapot cpu support at runtime

[Conor Dooley]

On Fri, Dec 16, 2022 at 02:21:06PM +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 hugetlb fs and huge vmap.
> 
> This patchset adds a Kconfig item for using Svnapot in
> "Platform type"->"SVNAPOT extension support". Its default value is on,
> and people can set it off if they don't 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
> Changes in v7:
>   - add napot_cont_order for possible more napot order in the future
>   - remove linear mapping related code from this patchset to another patch
>   - refactor hugetlb code for svnapot according to thanks @Andrew @Conor
>   - use tools/testing/selftests/vm/map_hugetlb as hugetlb testing program
>   - support svnapot in huge vmap on newer for-next branch
> Changes in v8:
>   - fix compilation errors in rv32_defconfig
>   - insert some lines of whitespace according to @Conor's suggestion
> Changes in v9:
>   - use alternative to avoid using static branches inside heavily used
>     inline functions
>   - change napot_cont_mask definition
>   - post test_vmalloc modification about testing vmalloc_huge
> Changes in v10:
>   - fix some nits caught by @Andrew
>   - collect Reviewed-by/Acked-by
>   - add memory leak warning in KConfig text

I got slightly confused between version as I was travelling - I saw 2
v10s so hopefully I have not missed anything. While "leak" is probably
not the right word to use here, I think the warning is a reasonable
compromise.
Acked-by: Conor Dooley <conor.dooley at microchip.com>

I have one minor wording nit in patch 1/3, but don't bother resubmitting
unless someone else asks for meaningful changes.

Thanks,
Conor.

>   - replace test_vmalloc patch link with the standard one
> Changes in v11:
>   - add more detailed warning about HUGETLBFS and SVNAPOT in KConfig text
>   - fix missing reverse-xmas tree
> 
> 
> Qinglin Pan (3):
>   riscv: mm: modify pte format for Svnapot
>   riscv: mm: support Svnapot in hugetlb page
>   riscv: mm: support Svnapot in huge vmap
> 
>  arch/riscv/Kconfig                   |  21 +-
>  arch/riscv/include/asm/errata_list.h |  15 +-
>  arch/riscv/include/asm/hugetlb.h     |  34 ++-
>  arch/riscv/include/asm/hwcap.h       |   2 +-
>  arch/riscv/include/asm/page.h        |   5 -
>  arch/riscv/include/asm/pgtable-64.h  |  34 +++
>  arch/riscv/include/asm/pgtable.h     |  43 +++-
>  arch/riscv/include/asm/vmalloc.h     |  61 +++++-
>  arch/riscv/kernel/cpu.c              |   1 +
>  arch/riscv/kernel/cpufeature.c       |  15 ++
>  arch/riscv/mm/hugetlbpage.c          | 301 +++++++++++++++++++++++++++
>  11 files changed, 519 insertions(+), 13 deletions(-)
> 
> -- 
> 2.37.4
> 
> 
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