[PATCH v12 0/3] riscv, mm: detect svnapot cpu support at runtime

[Conor Dooley]

Hey!

On Thu, Feb 09, 2023 at 12:00:32PM +0800, Qinglin Pan wrote:
> Hi all,
> 
> Sorry for bothering :(
> 
> This patchset has a bit of a formatting problem.
> Please use another one:
> https://lore.kernel.org/linux-riscv/20230209035343.15282-1-panqinglin00@gmail.com/T/#t

If you're resending, please either mark as RESEND or increment the
version number so that tools don't get confused.
In this case though, tools found some issues with both version
unfortunately:
https://patchwork.kernel.org/project/linux-riscv/patch/20230209035343.15282-2-panqinglin00@gmail.com/
https://patchwork.kernel.org/project/linux-riscv/patch/20230209035343.15282-3-panqinglin00@gmail.com/
(if you click on the descriptions you should get more information on
what is wrong)

You can fix those up and send a v13 and it'll all be clear then ;)

Cheers,
Conor.

> 
> Thanks,
> Qinglin
> 
> On 2023/2/9 11:13, Qinglin Pan wrote:
> > 
> > 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
> >    - 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
> > Changes in v12:
> >    - rebase on the new ISA extension API [1]
> > 
> > [1]https://lore.kernel.org/all/20230128172856.3814-5-jszhang@kernel.org/
> > 
> > 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/hugetlb.h    |  34 +++-
> >   arch/riscv/include/asm/hwcap.h      |   9 +-
> >   arch/riscv/include/asm/page.h       |   5 -
> >   arch/riscv/include/asm/pgtable-64.h |  34 ++++
> >   arch/riscv/include/asm/pgtable.h    |  39 +++-
> >   arch/riscv/include/asm/vmalloc.h    |  61 +++++-
> >   arch/riscv/kernel/cpu.c             |   1 +
> >   arch/riscv/kernel/cpufeature.c      |   1 +
> >   arch/riscv/mm/hugetlbpage.c         | 301 ++++++++++++++++++++++++++++
> >   10 files changed, 493 insertions(+), 13 deletions(-)
> > 
> 
> 
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