linux-kernel - Re: [PATCH v1 0/2] RISC-V: enable rust

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Message-ID: <CALNs47tr4nGhGTahZ9jyv-t4yKAGs-EX_fSZ_jwyT7WoYaB2WA@mail.gmail.com>
Date: Tue, 13 Feb 2024 22:14:14 -0500
From: Trevor Gross <tmgross@...ch.edu>
To: Ramon de C Valle <rcvalle@...gle.com>
Cc: Sami Tolvanen <samitolvanen@...gle.com>, Conor Dooley <conor@...nel.org>, 
	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, Conor Dooley <conor.dooley@...rochip.com>, 
	linux-riscv@...ts.infradead.org, Miguel Ojeda <ojeda@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida Filho <wedsonaf@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Jonathan Corbet <corbet@....net>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, 
	rust-for-linux@...r.kernel.org, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, 
	Matthew Maurer <mmaurer@...gle.com>
Subject: Re: [PATCH v1 0/2] RISC-V: enable rust

On Tue, Feb 13, 2024 at 3:09 PM Ramon de C Valle <rcvalle@...gle.com> wrote:
>
> On Mon, Feb 12, 2024 at 12:36 PM Sami Tolvanen <samitolvanen@...gle.com> wrote:
> >
> > On Mon, Feb 12, 2024 at 11:04 AM Ramon de C Valle <rcvalle@...gle.com> wrote:
> > >
> > > Sorry for the late reply. Sami might be the best person to answer
> > > this, but KCFI (not CFI) tests are lowered by passes that are
> > > architecture specific (see https://reviews.llvm.org/D119296), so we'd
> > > need to add support for RISC-V. There is no additional work required
> > > in the Rust compiler besides enabling it for the new target.
> >
> > LLVM 17 added KCFI support for RISC-V. Sounds like it's just a
> > question of whether rustc uses a new enough version of LLVM then?
>
> rustc is using LLVM 17 since
> https://github.com/rust-lang/rust/pull/114048, so I guess I can enable
> it for RISC-V targets in
> https://github.com/rust-lang/rust/tree/master/compiler/rustc_target/src/spec/targets,
> and the Linux kernel will get it on the next compiler update?

18 as of a few hours ago :) https://github.com/rust-lang/rust/pull/120055

Just for an idea of timing, anything merged this month will be in 1.78
on 2024-05-02.