Re: [PATCH v14 2/8] mm: rust: add vm_area_struct methods that require read access

[Gary Guo <gary@garyguo.net>]

On Thu, 13 Feb 2025 11:04:01 +0000
Alice Ryhl <aliceryhl@google.com> wrote:

> This adds a type called VmaRef which is used when referencing a vma that
> you have read access to. Here, read access means that you hold either
> the mmap read lock or the vma read lock (or stronger).
> 
> Additionally, a vma_lookup method is added to the mmap read guard, which
> enables you to obtain a &VmaRef in safe Rust code.
> 
> This patch only provides a way to lock the mmap read lock, but a
> follow-up patch also provides a way to just lock the vma read lock.
> 
> Acked-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
> Reviewed-by: Jann Horn <jannh@google.com>
> Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org>
> Signed-off-by: Alice Ryhl <aliceryhl@google.com>

Reviewed-by: Gary Guo <gary@garyguo.net>

> ---
>  rust/helpers/mm.c      |   6 ++
>  rust/kernel/mm.rs      |  23 ++++++
>  rust/kernel/mm/virt.rs | 210 +++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 239 insertions(+)