linux-kernel - Re: [PATCH v4 4/4] arm64/mm: Add uffd write-protect support

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Message-ID: <a980d401-6d41-4700-8775-c486a50f5c5a@redhat.com>
Date: Tue, 7 May 2024 13:45:41 +0200
From: David Hildenbrand <david@...hat.com>
To: Ryan Roberts <ryan.roberts@....com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Joey Gouly <joey.gouly@....com>, Ard Biesheuvel <ardb@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Anshuman Khandual <anshuman.khandual@....com>, Peter Xu <peterx@...hat.com>,
 Mike Rapoport <rppt@...ux.ibm.com>, Shivansh Vij <shivanshvij@...look.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/4] arm64/mm: Add uffd write-protect support

On 03.05.24 16:46, Ryan Roberts wrote:
> Let's use the newly-free PTE SW bit (58) to add support for uffd-wp.
> 
> The standard handlers are implemented for set/test/clear for both pte
> and pmd. Additionally we must also track the uffd-wp state as a pte swp
> bit, so use a free swap pte bit (3).
> 
> Acked-by: Peter Xu <peterx@...hat.com>
> Reviewed-by: Catalin Marinas <catalin.marinas@....com>
> Reviewed-by: David Hildenbrand <david@...hat.com>
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>

LGTM, thanks!

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb