linux-kernel - Re: [PATCH] mseal sysmap: add arch-support txt

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Message-ID: <CABi2SkUAnWAu9L-Km35U4XMmbp9-w+hKCXkM6MYNejYi5ip5Tg@mail.gmail.com>
Date: Tue, 18 Mar 2025 11:39:21 -0700
From: Jeff Xu <jeffxu@...omium.org>
To: Geert Uytterhoeven <geert@...ux-m68k.org>, edumazet@...gle.com, m-malladi@...com, 
	Kevin Brodsky <kevin.brodsky@....com>, guoweikang.kernel@...il.com, 
	Qi Zheng <zhengqi.arch@...edance.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, akpm@...ux-foundation.org, 
	Liam.Howlett@...cle.com, agordeev@...ux.ibm.com, borntraeger@...ux.ibm.com, 
	gor@...ux.ibm.com, hca@...ux.ibm.com, kees@...nel.org, 
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, svens@...ux.ibm.com, thomas.weissschuh@...utronix.de
Subject: Re: [PATCH] mseal sysmap: add arch-support txt

Hi Geert

On Tue, Mar 18, 2025 at 10:21 AM Jeff Xu <jeffxu@...omium.org> wrote:
>
> Hi Geert,
>
> On Mon, Mar 17, 2025 at 12:14 PM Geert Uytterhoeven
> <geert@...ux-m68k.org> wrote:
> >
> > Hi Jeff,
> >
> > On Mon, 17 Mar 2025 at 20:02, Jeff Xu <jeffxu@...omium.org> wrote:
> > > On Mon, Mar 17, 2025 at 11:14 AM Jeff Xu <jeffxu@...omium.org> wrote:
> > > > On Fri, Mar 14, 2025 at 3:41 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > > > On Thu, 13 Mar 2025 at 23:26, Jeff Xu <jeffxu@...omium.org> wrote:
> > > > > > On Wed, Mar 12, 2025 at 10:21 PM Lorenzo Stoakes
> > > > > > <lorenzo.stoakes@...cle.com> wrote:
> > > > > > > On Thu, Mar 13, 2025 at 12:06:23AM +0000, jeffxu@...omium.org wrote:
> > > > > > > > From: Jeff Xu <jeffxu@...omium.org>
> > > > > > > > Add Documentation/features/core/mseal_sys_mappings/arch-support.txt
> > > > > > > >
> > > > > > > > Signed-off-by: Jeff Xu <jeffxu@...omium.org>
> > > > >
> > > > > Thanks for your patch!
> > >
> > > I used "find * |xargs grep -i  CONFIG_64BIT" to look for CONFIG_64BIT
> > > under arch/, and together with internet search/wiki page, and below is
> > > the proposed update.
> >
> > That way you only find users of the symbol, not where it is defined.
> >
> > You can use
> >
> >     git grep -W "config\s*64BIT" -- arch/
> >
> > to find out which architectures are 32-bit, 64-bit, or support both.
> >
Microblaze, openrisc, sh, hexagon all don't have CONFIG 64BIT defined
in KCONFIG, and are not using CONFIG_64BIT in their arch code.  Is
there something else that makes you point out the hexagon as 32 bit
only (and not other 3) ?

The microblaze/ openrisc/sh are currently listed as TODO in this patch
, and that is because the search results show they have 64 bits CPU.
But I like to double check.

I  included some people who recently merged into those arches in case
anyone is familiar with 32bit/64 bits usage in those architectures.

Thanks
-Jeff

> Good to know, thanks!
>
> > > > > > > > --- /dev/null
> > > > > > > > +++ b/Documentation/features/core/mseal_sys_mappings/arch-support.txt
> > > > > > > > @@ -0,0 +1,30 @@
> > > > > > > > +#
> > > > > > > > +# Feature name:          mseal-system-mappings
> > > > > > > > +#         Kconfig:       ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS
> > > > > > > > +#         description:   arch supports mseal system mappings
> > > > > > > > +#
> > > > > > > > +    -----------------------
> > > > > > > > +    |         arch |status|
> > > > > > > > +    -----------------------
> > > > > > > > +    |       alpha: | TODO |
> > > No CONFIG_64BIT found under arch/alpha, but search results show alpha
> > > supports 64 bits. Keep as TODO.
> >
> > Alpha is 64-bit only. So the code under arch/alpha/ does not need to check for
> > CONFIG_64BIT, hence you didn't find it;-)
> >
> > > > > > > > +    |         arc: | TODO |
> > > > > > > > +    |         arm: |  N/A |
> > > > > > > > +    |       arm64: |  ok  |
> > > > > > > > +    |        csky: | TODO |
> > > (N/A)
> > >
> > > > > > > > +    |     hexagon: | TODO |
> > > No CONFIG_64BIT found under arch/hexagon, but search results show
> > > hexagon supports 64 bits. Keep as TODO.
> >
> > 32-bit only on Linux.
> >
> Ok. Thank you for correcting this.
>
> Thanks
> -Jeff
>
> > Gr{oetje,eeting}s,
> >
> >                         Geert
> >
> > --
> > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> >
> > In personal conversations with technical people, I call myself a hacker. But
> > when I'm talking to journalists I just say "programmer" or something like that.
> >                                 -- Linus Torvalds