From: Matthew Wilcox <willy@infradead.org>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: "David Hildenbrand" <david@redhat.com>,
"Asahi Lina" <lina@asahilina.net>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <benno.lossin@proton.me>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Alice Ryhl" <aliceryhl@google.com>,
"Trevor Gross" <tmgross@umich.edu>,
"Jann Horn" <jannh@google.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Danilo Krummrich" <dakr@kernel.org>,
"Wedson Almeida Filho" <wedsonaf@gmail.com>,
"Valentin Obst" <kernel@valentinobst.de>,
"Andrew Morton" <akpm@linux-foundation.org>,
linux-mm@kvack.org, airlied@redhat.com,
"Abdiel Janulgue" <abdiel.janulgue@gmail.com>,
rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
asahi@lists.linux.dev
Subject: Re: [PATCH 0/6] rust: page: Support borrowing `struct page` and physaddr conversion
Date: Wed, 5 Feb 2025 23:17:18 +0000 [thread overview]
Message-ID: <Z6Pxfo1xDHUOna6a@casper.infradead.org> (raw)
In-Reply-To: <20250204204947.GM2296753@ziepe.ca>
On Tue, Feb 04, 2025 at 04:49:47PM -0400, Jason Gunthorpe wrote:
> The phys_to_virt() I mean is on the page table pages themselves, not
> on a leaf.
>
> All page table pages came from alloc_pages_node() and you'd do
> virt_to_phys() to stick them into a next-table PTE, then
> phys_to_virt() to bring them back:
>
> phys_to_virt(virt_to_phys(page_address(alloc_pages_node())))
>
> Effectively.
except for s390 & ppc where the page table can be smaller than
PAGE_SIZE, so you really only have a physical address that can be
converted to a virtual address.
next prev parent reply other threads:[~2025-02-05 23:17 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-02 13:05 [PATCH 0/6] rust: page: Support borrowing `struct page` and physaddr conversion Asahi Lina
2025-02-02 13:05 ` [PATCH 1/6] rust: types: Add Ownable/Owned types Asahi Lina
2025-02-03 9:13 ` Alice Ryhl
2025-02-03 14:17 ` Asahi Lina
2025-02-03 18:17 ` Alice Ryhl
2025-02-03 19:17 ` Asahi Lina
2025-02-19 8:34 ` Andreas Hindborg
2025-02-19 8:37 ` Andreas Hindborg
2025-02-02 13:05 ` [PATCH 2/6] rust: page: Convert to Ownable Asahi Lina
2025-02-03 9:17 ` Alice Ryhl
2025-02-03 9:39 ` Fiona Behrens
2025-02-19 8:46 ` Andreas Hindborg
2025-02-02 13:05 ` [PATCH 3/6] rust: page: Make with_page_mapped() and with_pointer_into_page() public Asahi Lina
2025-02-03 9:10 ` Alice Ryhl
2025-02-03 9:43 ` Fiona Behrens
2025-02-19 8:48 ` Andreas Hindborg
2025-02-02 13:05 ` [PATCH 4/6] rust: addr: Add a module to declare core address types Asahi Lina
2025-02-03 9:09 ` Alice Ryhl
2025-02-03 15:04 ` Boqun Feng
2025-02-04 11:50 ` Asahi Lina
2025-02-04 14:50 ` Boqun Feng
2025-02-19 8:51 ` Andreas Hindborg
2025-02-02 13:05 ` [PATCH 5/6] rust: page: Add physical address conversion functions Asahi Lina
2025-02-03 9:35 ` Alice Ryhl
2025-02-04 11:43 ` Asahi Lina
2025-02-03 9:53 ` Fiona Behrens
2025-02-03 10:01 ` Alice Ryhl
2025-02-19 9:06 ` Andreas Hindborg
2025-02-02 13:05 ` [PATCH 6/6] rust: page: Make Page::as_ptr() pub(crate) Asahi Lina
2025-02-03 9:08 ` Alice Ryhl
2025-02-19 9:08 ` Andreas Hindborg
2025-02-03 9:58 ` [PATCH 0/6] rust: page: Support borrowing `struct page` and physaddr conversion Simona Vetter
2025-02-03 14:32 ` Asahi Lina
2025-02-03 21:05 ` Zi Yan
2025-02-04 10:26 ` David Hildenbrand
2025-02-04 11:41 ` Asahi Lina
2025-02-04 11:59 ` David Hildenbrand
2025-02-04 13:05 ` Asahi Lina
2025-02-04 14:38 ` David Hildenbrand
2025-02-04 17:59 ` Asahi Lina
2025-02-04 20:10 ` David Hildenbrand
2025-02-04 21:06 ` Asahi Lina
2025-02-06 17:58 ` David Hildenbrand
2025-02-06 19:18 ` Asahi Lina
2025-02-06 19:27 ` Asahi Lina
2025-02-12 19:06 ` David Hildenbrand
2025-02-12 19:01 ` David Hildenbrand
2025-02-05 7:40 ` Simona Vetter
2025-02-12 19:07 ` David Hildenbrand
2025-02-04 10:33 ` David Hildenbrand
2025-02-04 18:39 ` Jason Gunthorpe
2025-02-04 19:01 ` Asahi Lina
2025-02-04 20:05 ` David Hildenbrand
2025-02-04 20:26 ` Jason Gunthorpe
2025-02-04 20:41 ` David Hildenbrand
2025-02-04 20:47 ` David Hildenbrand
2025-02-04 21:18 ` Asahi Lina
2025-02-06 18:02 ` David Hildenbrand
2025-02-04 20:49 ` Jason Gunthorpe
2025-02-05 23:17 ` Matthew Wilcox [this message]
2025-02-06 18:04 ` David Hildenbrand
2025-02-03 10:22 ` Danilo Krummrich
2025-02-03 14:41 ` Asahi Lina
2025-02-15 19:47 ` Asahi Lina
2025-02-17 8:50 ` Abdiel Janulgue
2025-02-19 9:24 ` Andreas Hindborg
-- strict thread matches above, loose matches on Subject: below --
2025-03-06 19:21 Oliver Mangold
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