linux-kernel - Re: [PATCH v10 25/27] x86: enable initial Rust support

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Message-ID: <CAGSQo00gJsE+mQObeK4NNGDYLpZDDAZsREr15JcjD8Fo0E4pkw@mail.gmail.com>
Date:   Mon, 9 Oct 2023 09:00:58 -0700
From:   Matthew Maurer <mmaurer@...gle.com>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>, rcvalle@...gle.com,
        Miguel Ojeda <ojeda@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, patches@...ts.linux.dev,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...gle.com>,
        David Gow <davidgow@...gle.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Jonathan Corbet <corbet@....net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-doc@...r.kernel.org
Subject: Re: [PATCH v10 25/27] x86: enable initial Rust support

I have a patchset enabling support for both KCFI and IBT in the
kernel, but it uses changes not yet landed in stable rustc, which is
why I haven't sent it to the list yet:
https://github.com/Rust-for-Linux/linux/pull/1034

We've backported the changes to rustc that need to be present onto the
Android copy of the compiler, but it will take 6-12 weeks for them to
hit stable rustc, which is what general Linux is using.

If the IBT part would be helpful by itself immediately, I can split
that out - it's only the KCFI portion that won't currently work.

On Fri, Oct 14, 2022 at 1:40 PM Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
>
> On Fri, Oct 14, 2022 at 8:35 PM Sami Tolvanen <samitolvanen@...gle.com> wrote:
> >
> > Thanks, Miguel. I also talked to Ramon about KCFI earlier this week
> > and he expressed interest in helping with rustc support for it. In the
>
> Ah, that is great to hear -- thanks a lot to you both! (Cc'ing Ramon)
>
> > meanwhile, I think we can just add a depends on !CFI_CLANG to avoid
> > issues here.
>
> ACK, thanks -- if you want to send the patch, please feel free to do so.
>
> Cheers,
> Miguel