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

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Message-ID: <2025060126-various-greasily-61df@gregkh>
Date: Sun, 1 Jun 2025 09:48:11 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Timur Tabi <timur@...nel.org>
Cc: Alexandre Courbot <acourbot@...dia.com>,
	Danilo Krummrich <dakr@...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,
	Timur Tabi <ttabi@...dia.com>
Subject: Re: [PATCH] rust: add basic ELF sections parser

On Sat, May 31, 2025 at 09:38:24AM -0500, Timur Tabi wrote:
> On Sat, May 31, 2025 at 7:25 AM Greg KH <gregkh@...uxfoundation.org> wrote:
> >
> > What exactly do you mean by this?  That is what I have been asking, what
> > is the specific reason why this can't be done in userspace?  What
> > hardware "thing" can't be read by userspace, and why not?  Userspace has
> > access to PCI devices directly, surely there is nothing "secret" here.
> 
> Why in the world would you want user space to read hardware registers,
> when the driver is already doing it???????
> 
> And please note that the driver has to read and parse a lot of other
> register in order to know which register contains the fuse settings,
> and even whether that register exists, and at what address.  The fuse
> register is hardware-specific.  It doesn't exist on Turing, it does
> exist on Ampere and Ada (but just GA10x, not GA100), and it's not used
> on Hopper and Blackwell.  You want to duplicate all this code in
> user-space (assuming that registers really are accessible in user
> space), just avoid a 12-line function that already exists and works in
> Nouveau?????????

Because you are not proposing a 12 line function here, you all were
attempting to add an elf parser to the core kernel that everyone would
always load into their memory space.

> Please make it make sense, Greg.

Please read my thread where I asked for detailed specifics as to exactly
what is required here for you all to determine what is needed to load
the firmware.

have a good weekend,

greg k-h