linux-kernel - Re: [PATCH 0/6] rust: page: Support borrowing `struct page` and physaddr conversion

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250204202656.GL2296753@ziepe.ca>
Date: Tue, 4 Feb 2025 16:26:56 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: David Hildenbrand <david@...hat.com>
Cc: Asahi Lina <lina@...hilina.net>, 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>,
	Jann Horn <jannh@...gle.com>, Matthew Wilcox <willy@...radead.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Danilo Krummrich <dakr@...nel.org>,
	Wedson Almeida Filho <wedsonaf@...il.com>,
	Valentin Obst <kernel@...entinobst.de>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	airlied@...hat.com, Abdiel Janulgue <abdiel.janulgue@...il.com>,
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
	asahi@...ts.linux.dev
Subject: Re: [PATCH 0/6] rust: page: Support borrowing `struct page` and
 physaddr conversion

On Tue, Feb 04, 2025 at 09:05:47PM +0100, David Hildenbrand wrote:
> Fully agreed, this is going into the right direction. Dumping what's mapped
> is a different story. Maybe that dumping logic could simply be written in C
> for the time being?

?

Isn't dumping just a
  decode pte -> phys_to_virt() -> for_each_u64(virt) -> printk?

If you can populate the page table in rust you have to be able to dump
it, surely.

Or do you mean trying to decode the leaf entires into some struct page
detail? Does a GPU need to do that? Agree that would be better as some
C function to take in a KVA instead of a struct page and populate a
string with details about that KVA from the struct page.

Jason