Re: [RFC PATCH 0/7] arm64: Enable LPA2 support for 16k pages

From: Catalin Marinas <catalin.marinas@arm.com>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org,
	Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Kees Cook <keescook@chromium.org>,
	Mark Brown <broonie@kernel.org>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Richard Henderson <richard.henderson@linaro.org>
Subject: Re: [RFC PATCH 0/7] arm64: Enable LPA2 support for 16k pages
Date: Fri, 18 Nov 2022 10:38:15 +0000	[thread overview]
Message-ID: <Y3dgl3Q9x84NUlwM@arm.com> (raw)
In-Reply-To: <20221117132423.1252942-1-ardb@kernel.org>

Hi Ard,

On Thu, Nov 17, 2022 at 02:24:16PM +0100, Ard Biesheuvel wrote:
> Enable support for LPA2 when running with 16k pages. Unlike with 4k
> pages, this does not require adding support for 5 level paging, but
> beyond that, there is no fundamental difference between LPA2 support on
> 4k or 16k pages.

We have some patches already from Anshuman, targeting both 4K and 16K
pages:

https://lore.kernel.org/r/1632998116-11552-1-git-send-email-anshuman.khandual@arm.com

I don't think they've been rebased on top of 6.1-rcX though. Could you
please liaise with Anshuman and agree on a way forward? I'd rather only
review a single series if they do the same thing. I have a preference
for a more complete solution (4K and 16K) rather than just 16K pages. I
think we can even ignore some corner cases like 39-bit VA (if anyone is
asking, we could do it later but it doesn't seem realistic).

And a question for Anshuman: do you plan to refresh your series?

Thanks.

-- 
Catalin

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