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

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Message-ID: <c4c39ea5-3602-4b92-9ffd-af33e122538d@redhat.com>
Date: Tue, 4 Feb 2025 21:47:53 +0100
From: David Hildenbrand <david@...hat.com>
To: Jason Gunthorpe <jgg@...pe.ca>
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 04.02.25 21:41, David Hildenbrand wrote:
> On 04.02.25 21:26, Jason Gunthorpe wrote:
>> 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?
>>
> 
> IIUC, the problematic bit is that you might not have a directmap such
> that phys_to_virt() would tell you the whole story.

... but it's late and I am confused. For dumping the *page table* that 
would not be required, only when dumping mapped page content (and at 
this point I am not sure if that is a requirement).

So hopefully Asahi Lina can clarify what the issue was (if there is any 
:) ).

-- 
Cheers,

David / dhildenb