Received-SPF: pass (google.com: domain of linux-kernel+bounces-64702-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) client-ip=147.75.48.161;
Precedence: bulk
MIME-Version: 1.0
References: <20240117-swiftly-parasail-618d62972d6e@spud> <CANiq72mVKCOAuK4Qe+8AHmpkFwyJsVfx8AqB7ccGi3DYpSSWcw@mail.gmail.com>
 <20240118-implode-delirium-eefdd86e170e@spud> <CANiq72nx1s_nyvPW86jL7eiOxROr18LfOJqNtw8L42CP+gkhRg@mail.gmail.com>
 <20240125-bucked-payroll-47f82077b262@wendy> <CANiq72k7n0aZrifRRU08N8qLkNe+2EZwijZy5sM7M56n2xYHgQ@mail.gmail.com>
 <20240125-lazy-thrower-744aacc6632a@wendy> <CANiq72kb+_utZrYHtoKZQtQazikmkjpVUHpTBcaANizduMF5QQ@mail.gmail.com>
 <20240126-eccentric-jaywalker-3560e2151a92@spud> <CANiq72nu2NXUWYanHZd5EXgX4P_v673EWn6SCRW60Es9naraQQ@mail.gmail.com>
 <20240209-rage-keg-1b2982cd17d9@spud> <CALNs47sRqAbE=u3=_ciO2oge7Afz-6GBBhW+BwcLRET-TsuxTg@mail.gmail.com>
 <CAOcBZOSfN8Yefez_Gy_T3_QTAd4HcLzmMCOoR37K2agWD_U_PQ@mail.gmail.com>
 <CABCJKueFuDkmUmXWbtA3DveQ719vdZx5kBQE1bZ1f6oD5zYNzA@mail.gmail.com> <CAOcBZOQMF9_QqPvTPoRa=uHw11o74-hm=YdjtDCTj-yeq4nwjg@mail.gmail.com>
In-Reply-To: <CAOcBZOQMF9_QqPvTPoRa=uHw11o74-hm=YdjtDCTj-yeq4nwjg@mail.gmail.com>
From: Trevor Gross <tmgross@umich.edu>
Date: Tue, 13 Feb 2024 22:14:14 -0500
Message-ID: <CALNs47tr4nGhGTahZ9jyv-t4yKAGs-EX_fSZ_jwyT7WoYaB2WA@mail.gmail.com>
Subject: Re: [PATCH v1 0/2] RISC-V: enable rust
To: Ramon de C Valle <rcvalle@google.com>
Cc: Sami Tolvanen <samitolvanen@google.com>, Conor Dooley <conor@kernel.org>, 
	Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>, Conor Dooley <conor.dooley@microchip.com>, 
	linux-riscv@lists.infradead.org, Miguel Ojeda <ojeda@kernel.org>, 
	Alex Gaynor <alex.gaynor@gmail.com>, Wedson Almeida Filho <wedsonaf@gmail.com>, 
	Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>, 
	=?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>, 
	Jonathan Corbet <corbet@lwn.net>, Paul Walmsley <paul.walmsley@sifive.com>, 
	Palmer Dabbelt <palmer@dabbelt.com>, Nathan Chancellor <nathan@kernel.org>, 
	Nick Desaulniers <ndesaulniers@google.com>, Tom Rix <trix@redhat.com>, 
	rust-for-linux@vger.kernel.org, linux-doc@vger.kernel.org, 
	linux-kernel@vger.kernel.org, llvm@lists.linux.dev, 
	Matthew Maurer <mmaurer@google.com>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

On Tue, Feb 13, 2024 at 3:09=E2=80=AFPM Ramon de C Valle <rcvalle@google.co=
m> wrote:
>
> On Mon, Feb 12, 2024 at 12:36=E2=80=AFPM Sami Tolvanen <samitolvanen@goog=
le.com> wrote:
> >
> > On Mon, Feb 12, 2024 at 11:04=E2=80=AFAM Ramon de C Valle <rcvalle@goog=
le.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/s=
pec/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.