Re: [RFC PATCH 1/4] mm: pagewalk: add the ability to install PTEs

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To: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Subject: Re: [RFC PATCH 1/4] mm: pagewalk: add the ability to install PTEs
From: Jann Horn <jannh@xxxxxxxxxx>
Date: Fri, 11 Oct 2024 20:11:28 +0200
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Suren Baghdasaryan <surenb@xxxxxxxxxx>, "Liam R . Howlett" <Liam.Howlett@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, "Paul E . McKenney" <paulmck@xxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Muchun Song <muchun.song@xxxxxxxxx>, Richard Henderson <richard.henderson@xxxxxxxxxx>, Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>, Matt Turner <mattst88@xxxxxxxxx>, Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>, "James E . J . Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>, Helge Deller <deller@xxxxxx>, Chris Zankel <chris@xxxxxxxxxx>, Max Filippov <jcmvbkbc@xxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, linux-alpha@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, linux-parisc@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, Shuah Khan <shuah@xxxxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, linux-kselftest@xxxxxxxxxxxxxxx, Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
In-reply-to: <59e218670565accf978aeb8cf4745de4c0738773.1727440966.git.lorenzo.stoakes@oracle.com>
References: <cover.1727440966.git.lorenzo.stoakes@oracle.com> <59e218670565accf978aeb8cf4745de4c0738773.1727440966.git.lorenzo.stoakes@oracle.com>

On Fri, Sep 27, 2024 at 2:51 PM Lorenzo Stoakes
<lorenzo.stoakes@xxxxxxxxxx> wrote:
> Rather than add yet another implementation, we extend the generic pagewalk
> logic to enable the installation of page table entries by adding a new
> install_pte() callback in mm_walk_ops. If this is specified, then upon
> encountering a missing page table entry, we allocate and install a new one
> and continue the traversal.
[...]
>
> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>

Reviewed-by: Jann Horn <jannh@xxxxxxxxxx>

Follow-Ups:
- Re: [RFC PATCH 1/4] mm: pagewalk: add the ability to install PTEs
  - From: Lorenzo Stoakes

References:
- [RFC PATCH 0/4] implement lightweight guard pages
  - From: Lorenzo Stoakes
- [RFC PATCH 1/4] mm: pagewalk: add the ability to install PTEs
  - From: Lorenzo Stoakes

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