linux-kernel - Re: [PATCH] rust: add basic ELF sections parser

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Message-Id: <DA9AU3OBT29Z.3CX827C91I3IH@nvidia.com>
Date: Fri, 30 May 2025 15:59:03 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "Greg KH" <gregkh@...uxfoundation.org>
Cc: "Danilo Krummrich" <dakr@...nel.org>, "Timur Tabi" <timur@...nel.org>,
 "John Hubbard" <jhubbard@...dia.com>, "Miguel Ojeda" <ojeda@...nel.org>,
 "Alex Gaynor" <alex.gaynor@...il.com>, "Boqun Feng" <boqun.feng@...il.com>,
 "Gary Guo" <gary@...yguo.net>, Björn Roy Baron
 <bjorn3_gh@...tonmail.com>, "Benno Lossin" <benno.lossin@...ton.me>,
 "Andreas Hindborg" <a.hindborg@...nel.org>, "Alice Ryhl"
 <aliceryhl@...gle.com>, "Trevor Gross" <tmgross@...ch.edu>,
 <linux-kernel@...r.kernel.org>, <rust-for-linux@...r.kernel.org>
Subject: Re: [PATCH] rust: add basic ELF sections parser

On Fri May 30, 2025 at 3:22 PM JST, Greg KH wrote:
> On Fri, May 30, 2025 at 09:58:02AM +0900, Alexandre Courbot wrote:
>> However, Nova also supports a couple of older chip generations that use
>> the same GSP firmware -  it is for these that the ELF unpacking must
>> occur in the kernel. IIUC this has to do with the capabilities of the
>> microcontroller that ultimately does the loading (more capable RISC-V on
>> Hopper+ vs. older and more limited Falcon).
>
> Why specifically does the kernel have to get involved here?  What
> requires it to do it that userspace can not?

I don't know of a user-space tool that is readily available and could
perform such extraction of the ELF content upon kernel request. Is there
anything like this?