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From: Mike Rapoport <rppt@kernel.org>
To: "Adrian Barnaś" <abarnas@google.com>
Cc: Brendan Jackman <brendan.jackman@linux.dev>,
	linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Ryan Roberts <ryan.roberts@arm.com>,
	David Hildenbrand <david@kernel.org>,
	Ard Biesheuvel <ardb@kernel.org>,
	Christoph Lameter <cl@gentwo.org>,
	Yang Shi <yang@os.amperecomputing.com>,
	Brendan Jackman <jackmanb@google.com>,
	owner-linux-mm@kvack.org
Subject: Re: [RFC PATCH 3/6] arm64: mm: fix restoring linear map permissions on execmem cache clean
Date: Mon, 6 Jul 2026 14:35:14 +0300	[thread overview]
Message-ID: <akuS8uhjPBhI5mzZ@kernel.org> (raw)
In-Reply-To: <ajK6w3YTFpVaUl3v@google.com>

Hi Adrian,

On Wed, Jun 17, 2026 at 03:18:27PM +0000, Adrian Barnaś wrote:
> 
> Following your suggestion, I can put together a preparatory patch series to
> refactor the set_direct_map_* APIs to accept a nr_pages parameter. This
> refactoring would also allow us to drop the redundant set_area_direct_map
> helper. I could then rebase the rox_cache series on top of that.

I've been looking at something related and I was already half way through
adding numpages to set_direct_map when I remembered this conversation :)

Here's what I have for now:

https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/log/?h=direct-map/v0

This is only lightly build tested for arm64 and x86.

As this is WIP, things may change there, but I hope it can save you some
time with your arm64 ROX cache work.

> Does this sound like a good path forward?
> 
> Thanks,
> Adrian

-- 
Sincerely yours,
Mike.


  parent reply	other threads:[~2026-07-06 11:35 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-11 13:01 [RFC PATCH 0/6] arm64: mm: Introducing ROX CACHE to ARM64 systems with bbml2 no abort Adrian Barnaś
2026-06-11 13:01 ` [RFC PATCH 1/6] arm64: mm: explicitly declare module and ftrace execmem regions Adrian Barnaś
2026-06-11 13:36   ` Brendan Jackman
2026-06-11 13:01 ` [RFC PATCH 2/6] arm64: mm: allow huge vmap permission adjustments with bbml2_no_abort Adrian Barnaś
2026-06-18 14:21   ` Ryan Roberts
2026-06-24 13:54     ` Adrian Barnaś
2026-06-11 13:01 ` [RFC PATCH 3/6] arm64: mm: fix restoring linear map permissions on execmem cache clean Adrian Barnaś
2026-06-11 13:54   ` Brendan Jackman
2026-06-12  7:17     ` Mike Rapoport
2026-06-17 15:18       ` Adrian Barnaś
2026-06-17 18:40         ` Mike Rapoport
2026-06-24 13:57           ` Adrian Barnaś
2026-07-06 11:35         ` Mike Rapoport [this message]
2026-07-06 12:47           ` Adrian Barnaś
2026-06-18 15:05   ` Ryan Roberts
2026-06-19  8:33     ` Ryan Roberts
2026-06-24 13:52       ` Adrian Barnaś
2026-06-11 13:01 ` [RFC PATCH 4/6] arm64: mm: add helper to fill execmem with trapping instructions Adrian Barnaś
2026-06-19 10:54   ` Ryan Roberts
2026-06-19 10:58     ` Mike Rapoport
2026-06-11 13:01 ` [RFC PATCH 5/6] arm64: execmem: enable EXECMEM_ROX_CACHE on supported CPUs Adrian Barnaś
2026-06-19 12:09   ` Ryan Roberts
2026-06-11 13:01 ` [RFC PATCH 6/6] arm64: mm: support PMD page coalescing in the linear map Adrian Barnaś
2026-06-19 13:40   ` Ryan Roberts
2026-06-24 14:32     ` Adrian Barnaś
2026-07-06 12:41     ` Adrian Barnaś
2026-07-06 14:33       ` Mike Rapoport

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