Re: [PATCH v2] mseal sysmap: enable LoongArch

[Lorenzo Stoakes]

Hi Andrew - can we drop this from mm so it can go through the arch tree? I think
this is more appropriate, thanks!

On Wed, Apr 16, 2025 at 05:11:20PM +0800, Huacai Chen wrote:
[snip]
> In V1 you suggested this patch to go through the arch tree. But I saw
> Andrew has already taken it, what should I do now?

Can you take in your tree please? Andrew should drop, I really feel the arch
tree is the appropriate place, as this is purely an arch change.

Thanks!

>
>
> Huacai
>
> >
> > Thanks, Lorenzo
> >
> > >
> > > Huacai
> > >
> > > >
> > > > >
> > > > > Link: https://lore.kernel.org/all/25bad37f-273e-4626-999c-e1890be96182@lucifer.local/
> > > > > Tested-by: Yuli Wang <wangyuli@xxxxxxxxxxxxx>
> > > > > Signed-off-by: Yuli Wang <wangyuli@xxxxxxxxxxxxx>
> > > >
> > > > LGTM,
> > > >
> > > > Acked-by: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
> > > >
> > > > But let's get some R-b's from the arch people please!
> > > >
> > > > > ---
> > > > > Changelog:
> > > > >  *v1->v2: Modify mseal_sys_mappings/arch-support.txt.
> > > > > ---
> > > > >  .../features/core/mseal_sys_mappings/arch-support.txt         | 2 +-
> > > > >  Documentation/userspace-api/mseal.rst                         | 2 +-
> > > > >  arch/loongarch/Kconfig                                        | 1 +
> > > > >  arch/loongarch/kernel/vdso.c                                  | 4 +++-
> > > > >  4 files changed, 6 insertions(+), 3 deletions(-)
> > > > >
> > > > > diff --git a/Documentation/features/core/mseal_sys_mappings/arch-support.txt b/Documentation/features/core/mseal_sys_mappings/arch-support.txt
> > > > > index c6cab9760d57..a3c24233eb9b 100644
> > > > > --- a/Documentation/features/core/mseal_sys_mappings/arch-support.txt
> > > > > +++ b/Documentation/features/core/mseal_sys_mappings/arch-support.txt
> > > > > @@ -12,7 +12,7 @@
> > > > >      |       arm64: |  ok  |
> > > > >      |        csky: |  N/A |
> > > > >      |     hexagon: |  N/A |
> > > > > -    |   loongarch: | TODO |
> > > > > +    |   loongarch: |  ok  |
> > > > >      |        m68k: |  N/A |
> > > > >      |  microblaze: |  N/A |
> > > > >      |        mips: | TODO |
> > > > > diff --git a/Documentation/userspace-api/mseal.rst b/Documentation/userspace-api/mseal.rst
> > > > > index 1dabfc29be0d..ef733f69003d 100644
> > > > > --- a/Documentation/userspace-api/mseal.rst
> > > > > +++ b/Documentation/userspace-api/mseal.rst
> > > > > @@ -144,7 +144,7 @@ Use cases
> > > > >    architecture.
> > > > >
> > > > >    The following architectures currently support this feature: x86-64, arm64,
> > > > > -  and s390.
> > > > > +  loongarch and s390.
> > > > >
> > > > >    WARNING: This feature breaks programs which rely on relocating
> > > > >    or unmapping system mappings. Known broken software at the time
> > > > > diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
> > > > > index 067c0b994648..54ed5b59a690 100644
> > > > > --- a/arch/loongarch/Kconfig
> > > > > +++ b/arch/loongarch/Kconfig
> > > > > @@ -69,6 +69,7 @@ config LOONGARCH
> > > > >       select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
> > > > >       select ARCH_SUPPORTS_LTO_CLANG
> > > > >       select ARCH_SUPPORTS_LTO_CLANG_THIN
> > > > > +     select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS
> > > > >       select ARCH_SUPPORTS_NUMA_BALANCING
> > > > >       select ARCH_SUPPORTS_RT
> > > > >       select ARCH_USE_BUILTIN_BSWAP
> > > > > diff --git a/arch/loongarch/kernel/vdso.c b/arch/loongarch/kernel/vdso.c
> > > > > index 10cf1608c7b3..7b888d9085a0 100644
> > > > > --- a/arch/loongarch/kernel/vdso.c
> > > > > +++ b/arch/loongarch/kernel/vdso.c
> > > > > @@ -105,7 +105,9 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
> > > > >
> > > > >       vdso_addr = data_addr + VVAR_SIZE;
> > > > >       vma = _install_special_mapping(mm, vdso_addr, info->size,
> > > > > -                                    VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC,
> > > > > +                                    VM_READ | VM_EXEC |
> > > > > +                                    VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |
> > > > > +                                    VM_SEALED_SYSMAP,
> > > > >                                      &info->code_mapping);
> > > > >       if (IS_ERR(vma)) {
> > > > >               ret = PTR_ERR(vma);
> > > > > --
> > > > > 2.49.0
> > > > >