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

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Message-ID: <Y0BfN1BdVCWssvEu@hirez.programming.kicks-ass.net>
Date:   Fri, 7 Oct 2022 19:17:43 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Miguel Ojeda <ojeda@...nel.org>
Cc:     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

On Tue, Sep 27, 2022 at 03:14:56PM +0200, Miguel Ojeda wrote:
> Note that only x86_64 is covered and not all features nor mitigations
> are handled, but it is enough as a starting point and showcases
> the basics needed to add Rust support for a new architecture.

Does it fail the build if required options are missing? Specifically are
things like kCFI and IBT enabled? Silently not handling those will
result in an unbootable image.

As to missing mitigations; does it at least visibly warn people?

I'm very *very* uncomfortable having to 'support' a half-arsed compiler
like this.